Patent Publication Number: US-2021169942-A1

Title: Bacteria engineered to treat a disease or disorder

Description:
RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 15/852,762, filed on Dec. 22, 2017, which, in turn, is a continuation of U.S. application Ser. No. 15/319,564, filed on Dec. 16, 2016, now issued as U.S. Pat. No. 9,889,164 on Feb. 13, 2018, which is a 35 U.S.C. § 371 national stage filing of International Application No. PCT/US2016/032565, filed on May 13, 2016. PCT/US2016/032565, filed on May 13, 2016, in turn claims priority to U.S. Provisional Patent Application No. 62/335,780, filed on May 13, 2016; U.S. Provisional Patent Application No. 62/336,338, filed on May 13, 2016; U.S. Provisional Patent Application No. 62/336,012, filed on May 13, 2016; and U.S. Provisional Patent Application No. 62/335,940, filed on May 13, 2016. PCT/US2016/032565, filed on May 13, 2016, is further a continuation-in-part of U.S. patent application Ser. No. 15/154,934, filed on May 13, 2016; and a continuation-in-part of International Application No. PCT/US2016/032562, filed on May 13, 2016. PCT/US2016/032565, filed on May 13, 2016, further claims priority to U.S. Provisional Patent Application No. 62/277,654, filed on Jan. 12, 2016; U.S. Provisional Patent Application No. 62/277,413, filed on Jan. 11, 2016; and U.S. Provisional Patent Application No. 62/293,749, filed on Feb. 10, 2016. PCT/US2016/032565, filed on May 13, 2016, is further a continuation-in-part of International Application No. PCT/US2016/020530, filed on Mar. 2, 2016. PCT/US2016/032565, filed on May 13, 2016, further claims priority to U.S. Provisional Patent Application No. 62/173,761, filed on Jun. 10, 2015; U.S. Provisional Patent Application No. 62/173,706, filed on Jun. 10, 2015; U.S. Provisional Patent Application No. 62/173,710, filed on Jun. 10, 2015; U.S. Provisional Patent Application No. 62/277,346, filed on Jan. 11, 2016; U.S. Provisional Patent Application No. 62/199,445, filed on Jul. 31, 2015; U.S. Provisional Patent Application No. 62/314,322, filed on Mar. 28, 2016; and U.S. Provisional Patent Application No. 62/313,691, filed on Mar. 25, 2016. PCT/US2016/032565, filed on May 13, 2016, is further a continuation-in-part of U.S. patent application Ser. No. 14/960,333, filed on Dec. 4, 2015, now issued as U.S. Pat. No. 9,487,764 on Nov. 8, 2016; and a continuation-in-part of International Application No. PCT/US2015/064140, filed on Dec. 4, 2015. PCT/US2016/032565, filed on May 13, 2016, further claims priority to U.S. Provisional Patent Application No. 62/263,329, filed on Dec. 4, 2015; U.S. Provisional Patent Application No. 62/256,041, filed on Nov. 16, 2015; U.S. Provisional Patent Application No. 62/256,039, filed on Nov. 16, 2015; U.S. Provisional Patent Application No. 62/212,223, filed on Aug. 31, 2015; U.S. Provisional Patent Application No. 62/183,935, filed on Jun. 24, 2015; U.S. Provisional Patent Application No. 62/256,052, filed on Nov. 16, 2015; and U.S. Provisional Patent Application No. 62/161,137, filed on May 13, 2015. The entire contents of each of the foregoing applications are expressly incorporated herein by reference. 
    
    
     SEQUENCE LISTING 
     The instant application contains a Sequence Listing which has been submitted electronically in ASCII format and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Dec. 7, 2020, is named 126046-01404_SL.txt and is 355,221 bytes in size. 
     BACKGROUND OF THE INVENTION 
     It has recently been discovered that the microbiome in mammals plays a large role in health and disease (see Cho and Blaser,  Nature Rev. Genet.,  13:260-270, 2012 and Owyang and Wu,  Gastroenterol.,  146(6):1433-1436, 2014). Indeed, bacteria-free animals have abnormal gut epithelial and immune function, suggesting that the microbiome in the gut plays a critical role in the mammalian immune system. Specifically, the gut microbiome has been shown to be involved in diseases, including, for example, immune diseases (such as Inflammatory Bowel Disease), autism, liver disease, cancer, food allergy, metabolic diseases (such as urea cycle disorder, phenylketonuria, and maple syrup urine disease), obesity, and infection, among many others. 
     Fecal transplantation of native microbial strains has recently garnered much attention for its potential to treat certain microbial infections and immune diseases in the gut (Owyang and Wu, 2014). There have also been recent efforts to engineer microbes to produce, e.g., secrete, therapeutic molecules and administer them to a subject in order to deliver the therapeutic molecule(s) directly to the site where therapy is needed, such as various sites in the gut. However, such efforts have been frustrated for several reasons, mostly relating to the constitutive production of the bacteria and its gene product(s). For example, the viability and stability of the engineered microbes have been compromised due, in part, to the constitutive production of large amounts of foreign protein(s). Unfortunately, genetically engineered microbes which have been engineered to express intracellular therapeutic enzymes which degrade target molecules associated with disease states or disorders, e.g., diseases or disorders associated with the overexpression of a molecule which is harmful to a subject, have also been shown to have low efficacy and enzyme activity levels in vitro and in vivo. Accordingly, a need exists for improved genetically engineered microbes which are useful for therapeutic purposes. 
     SUMMARY 
     The instant invention surprisingly provides genetically engineered microbes which express a heterologous transporter in order to regulate, e.g., increase, the transport of target molecules associated with disease into the genetically engineered microbes in order to increase the therapeutic efficacy of the microbe. 
     In one aspect, the invention provides a genetically-engineered non-pathogenic microorganism comprising at least one heterologous gene encoding a substrate transporter, wherein the gene encoding the substrate transporter is operably linked to an inducible promoter. 
     In one embodiment, the bacterium is a Gram-positive bacterium. In one embodiment, the bacterium is a Gram-negative bacterium. In one embodiment, the bacterium is an obligate anaerobic bacterium. In one embodiment, the bacterium is a facultative anaerobic bacterium. 
     In one embodiment, the bacterium is an aerobic bacterium. In one embodiment, the bacterium is selected from  Clostridium novyi  NT,  Clostridium butyricum, E. coli  Nissle, and  E. coli  K-12. 
     In one embodiment, the inducible promoter is induced by low-oxygen or anaerobic conditions. In one embodiment, the inducible promoter is selected from a FNR-inducible promoter, an ANR-inducible promoter, and a DNR-inducible promoter. In one embodiment, the inducible promoter is P-fnrs promoter. 
     In one embodiment, the substrate transporter is capable of importing into the bacterium a substrate selected from the group consisting of an amino acid, a nucleoside, kynurenine, prostaglandin E2, lactic acid, propionate, bile salt, γ-aminobutyric acid (GABA), manganese, a toxin, and a peptide. 
     In one embodiment, the substrate transporter is an amino acid transporter capable of importing into the bacterium an amino acid selected from the group consisting of leucine, isoleucine, valine, arginine, lysine, asparagine, serine, glycine, glutamine, tryptophan, methionine, threonine, cysteine, tyrosine, phenylalanine, glutamic acid, aspartic acid, alanine, histidine, and proline. 
     In one embodiment, the heterologous gene encoding the amino acid transporter is from  Agrobacterium tumefaciens, Anabaena cylindrical, Anabaena variabilis, Bacillus amyloliquefaciens, Bacillus atrophaeus, Bacillus halodurans, Bacillus methanolicus, Bacillus subtilis, Caenorhabditis elegans, Clostridium botulinum, Corynebacterium glutamicum, Escherichia coli, Flavobacterium limosediminis, Helicobacter pylori, Klebsiella pneumonia, Lactococcus lactis, Lactobacillus saniviri, Legionella pneumophila Methylobacterium aquaticum, Mycobacterium bovis, Photorhabdus luminescens, Pseudomonas aeruginosa, Pseudomonas fluorescens, Saccharomyces cerevisiae, Salmonella enterica, Sinorhizobium meliloti , or  Ustilago maydis . In one embodiment, the heterologous gene encoding the amino acid transporter has a sequence with at least 90% identity to any one of SEQ ID NOs:9, 10, 13-18, 25, 26, 29, 35, 41-44, 46-48, 59-62, 69, 87, 91, 94-96, 98, or 103. In one embodiment, the heterologous gene encoding the amino acid transporter has a sequence comprising any one of SEQ ID NOs:9, 10, 13-18, 25, 26, 29, 35, 41-44, 46-48, 59-62, 69, 87, 91, 94-96, 98, or 103. In one embodiment, the heterologous gene encoding the amino acid transporter has a sequence consisting of any one of SEQ ID NOs:9, 10, 13-18, 25, 26, 29, 35, 41-44, 46-48, 59-62, 69, 87, 91, 94-96, 98, or 103. 
     In one embodiment, the substrate transporter is a nucleoside transporter capable of importing into the bacterium a nucleoside selected from the group consisting of adenosine, guanosine, uridine, inosine, xanthosine, thymidine and cytidine. In one embodiment, the heterologous gene encoding the nucleoside transporter is from  Bacillus halodurans, Bacillus subtilis, Caulobacter crescentus, Escherichia coli, Haemophilus influenzae, Helicobacter pylori, Pseudomonas, Bacillus subtilis, Escherichia coli, Prevotella intermedia, Porphytomonas gingivalis, Salmonella typhimurium, Salmonella enterica , or  Vibrio cholera.    
     In one embodiment, the heterologous gene encoding the nucleoside transporter has a sequence with at least 90% identity to any one of SEQ ID NOs:108-128. In one embodiment, the heterologous gene encoding the amino acid transporter has a sequence comprising any one of SEQ ID NOs:108-128. In one embodiment, the heterologous gene encoding the amino acid transporter has a sequence consisting of any one of SEQ ID NOs:108-128. 
     In one embodiment, the substrate transporter is a kynurenine transporter capable of importing kynurenine into the bacterium. In one embodiment, the heterologous gene encoding the kynurenine transporter is from  Escherichia coli, Saccharomyces cerevisiae  or  Corynebacterium glutamicum . In one embodiment, the heterologous gene encoding the kynurenine transporter has a sequence with at least 90% identity to any one of SEQ ID NOs:46-48. In one embodiment, the heterologous gene encoding the kynurenine transporter has a sequence comprising any one of SEQ ID NOs:46-48. In one embodiment, the heterologous gene encoding the amino acid transporter has a sequence consisting of any one of SEQ ID NOs:46-48. 
     In one embodiment, the substrate transporter is a prostaglandin E2 transporter capable of importing prostaglandin E2 into the bacterium. In one embodiment, the heterologous gene encoding the prostaglandin E2 (PGE2) transporter is from  Escherichia coli, Saccharomyces cerevisiae  or  Corynebacterium glutamicum.    
     In one embodiment, the substrate transporter is a lactic acid transporter capable of importing lactic acid into the bacterium. In one embodiment, the heterologous gene encoding the lactic acid transporter is from  Escherichia coli, Saccharomyces cerevisiae  and  Corynebacterium glutamicum.    
     In one embodiment, the substrate transporter is a propionate transporter capable of importing propionate into the bacterium. In one embodiment, the heterologous gene encoding the propionate transporter is from  Bacillus subtilis, Campylobacter jejuni, Clostridium perfringens, Escherichia coli, Lactobacillus delbrueckii, Mycobacterium smegmatis, Nocardia farcinica, Pseudomonas aeruginosa, Salmonella typhimurium, Virgibacillus , or  Staphylococcus aureus . In one embodiment, the heterologous gene encoding the propionate transporter has a sequence with at least 90% identity to any one of SEQ ID NOs:129-130. In one embodiment, the heterologous gene encoding the propionate transporter has a sequence comprising any one of SEQ ID NOs:129-130. In one embodiment, the heterologous gene encoding the propionate transporter has a sequence consisting of any one of SEQ ID NOs:129-130. 
     In one embodiment, the substrate transporter is a bile salt transporter capable of importing bile salt into the bacterium. In one embodiment, the heterologous gene encoding the bile salt transporter is from  Lactobacillus johnsonni . In one embodiment, the heterologous gene encoding the bile salt acid transporter has a sequence with at least 90% identity to any one of SEQ ID NOs:131-132. In one embodiment, the heterologous gene encoding the bile salt transporter has a sequence comprising any one of SEQ ID NOs:131-132. In one embodiment, the heterologous gene encoding the bile salt transporter has a sequence consisting of any one of SEQ ID NOs:131-132. 
     In one embodiment, the substrate transporter is a bile salt transporter capable of importing ammonia into the bacterium. In one embodiment, the heterologous gene encoding the ammonia transporter is from  Corynebacterium glutamicum, Escherichia coli, Streptomyces coelicolor  or  Ruminococcus albus . In one embodiment, the heterologous gene encoding the ammonia transporter has a sequence with at least 90% identity to SEQ ID NO:133. In one embodiment, the heterologous gene encoding the ammonia transporter has a sequence comprising SEQ ID NO:133. In one embodiment, the heterologous gene encoding the ammonia transporter has a sequence consisting of SEQ ID NO:133. 
     In one embodiment, the substrate transporter is a γ-aminobutyric acid (GABA) transporter capable of importing GABA into the bacterium. In one embodiment, the heterologous gene encoding the GABA transporter is from  Escherichia coli  or  Bacillus subtilis . In one embodiment, the heterologous gene encoding the GABA transporter has a sequence with at least 90% identity to SEQ ID NO:134. In one embodiment, the heterologous gene encoding the GABA transporter has a sequence comprising SEQ ID NO:134. In one embodiment, the heterologous gene encoding the GABA transporter has a sequence consisting of SEQ ID NO:134. 
     In one embodiment, the substrate transporter is a manganese transporter capable of importing manganese into the bacterium. In one embodiment, the heterologous gene encoding the manganese transporter is from  Bacillus subtilis, Staphylococcus aureus, Salmonella typhimurium, Shigella flexneri, Yersinia pestis , or  Escherichia coli . In one embodiment, the heterologous gene encoding the manganese transporter has a sequence with at least 90% identity to SEQ ID NO:135. In one embodiment, the heterologous gene encoding the manganese transporter has a sequence comprising SEQ ID NO:135. In one embodiment, the heterologous gene encoding the manganese transporter has a sequence consisting of SEQ ID NO:135. 
     In one embodiment, the substrate transporter is a toxin transporter capable of importing a toxin into the bacterium. In one embodiment, the substrate transporter is a peptide transporter capable of importing a peptide into the bacterium. 
     In one embodiment, the heterologous gene encoding the substrate transporter and operatively linked promoter are present on a chromosome in the bacterium. In one embodiment, the heterologous gene encoding the substrate transporter and operatively linked promoter are present on a plasmid in the bacterium. 
     In one embodiment, the bacterium is an auxotroph comprising a deletion or mutation in a gene required for cell survival and/or growth. In one embodiment, the gene required for cell survival and/or growth is selected from thyA, dapD, and dapA. 
     In one embodiment, the bacterium comprises a kill switch. 
     In one aspect, the present disclosure provides a pharmaceutical composition comprising a recombinant bacterium disclosed herein and a pharmaceutically acceptable carrier. 
     In another aspect, the present invention provides a method of treating a disease in a subject in need thereof comprising the step of administering to the subject a pharmaceutical composition comprising a recombinant bacterium disclosed herein and a pharmaceutically acceptable carrier. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG. 1  depicts a synthetic biotic for treating phenylketonuria (PKU) and disorders characterized by hyperphenylalaninemia. 
         FIG. 2  depicts a synthetic biotic for treating phenylketonuria (PKU) and disorders characterized by hyperphenylalaninemia. 
         FIG. 3  is a graph showing that PheP and AroP Transport Phe at the same rate. 
         FIG. 4  depicts a schematic representation of the construction of a pheP knock-in strain, wherein recombineering is used to insert a 2 nd  copy of pheP into the Nissle lacZ gene. 
         FIG. 5  depicts the gene organization of an exemplary construct comprising a gene encoding PheP, a gene coding TetR, and a Tet promoter sequence for chromosomal insertion e.g., as for example comprised in SYN-PKU203, SYN-PKU401, SYN-PKU402, SYN-PKU302, and SYN-PKU303. 
         FIGS. 6A and 6B  depict the gene organization of an exemplary construct, comprising a cloned PAL3 gene under the control of an FNR promoter sequence, on a low-copy, kanamycin-resistant plasmid (pSC101 origin of replication, ( FIG. 6A ). Under anaerobic conditions, PAL3 degrades phenylalanine to non-toxic trans-cinnamate.  FIG. 6B  depicts an additional copy of the endogenous  E. coli  high affinity phenylalanine transporter, pheP, driven by the PfnrS promoter and inserted into the lacZ locus on the Nissle chromosome. 
         FIGS. 7A, 7B, and 7C  depict schematic diagrams of non-limiting embodiments of the disclosure.  FIG. 7A  depicts phenylalanine degradation components integrated into the  E. coli  Nissle chromosome. In some embodiments, engineered plasmid-free bacterial strains are used to prevent plasmid conjugation in vivo. In some embodiments, multiple insertions of the PAL gene result in increased copy number and/or increased phenylalanine degradation activity. In some embodiments, a copy of the endogenous  E. coli  high affinity phenylalanine transporter, pheP, is driven by the PfnrS promoter and is inserted into the lacZ locus.  FIG. 7B  depicts a schematic diagram of one non-limiting embodiment of the disclosure, wherein the  E. coli  Nissle chromosome is engineered to contain four copies of PfnrS-PAL inserted at four different insertion sites across the genome (malE/K, yicS/nepI, agaI/rsmI, and cea), and one copy of a phenylalanine transporter gene inserted at a different insertion site (lacZ). In this embodiment, the PAL gene is PAL3 derived from  P. luminescens , and the phenylalanine transporter gene is pheP derived from  E. coli . In one embodiment, the strain is SYN-PKU511.  FIG. 7C  depicts a schematic diagram of one preferred embodiment of the disclosure, wherein the  E. coli  Nissle chromosome is engineered to contain five copies of PAL under the control of an oxygen level-dependent promoter (e.g., PfnrS-PAL3) inserted at different integration sites on the chromosome (malE/K, yicS/nepI, malP/T, agaI/rsmI, and cea), and one copy of a phenylalanine transporter gene under the control of an oxygen level-dependent promoter (e.g., PfnrS-pheP) inserted at a different integration site on the chromosome (lacZ). The genome is further engineered to include a thyA auxotrophy, in which the thyA gene is deleted and/or replaced with an unrelated gene, as well as a kanamycin resistance gene. 
         FIG. 8A  depicts phenylalanine concentrations in samples comprising bacteria expressing PAL1 or PAL3 on low-copy (LC) or high-copy (HC) plasmids, or further comprising a copy of pheP driven by the Tet promoter integrated into the chromosome. Bacteria were induced with ATC, and then grown in culture medium supplemented with 4 mM (660,000 ng/mL) of phenylalanine to an OD 600  of 2.0. Samples were removed at 0 hrs, 2 hrs, and 4 hrs post-induction and phenylalanine concentrations were determined by mass spectrometry. Notably, the additional copy of pheP permitted the degradation of phenylalanine (4 mM) in 4 hrs.  FIG. 8B  depicts cinnamate levels in samples at 2 hrs and 4 hrs post-induction. In some embodiments, cinnamate may be used as an alternative biomarker for strain activity. PheP overexpression improves phenylalanine metabolism in engineered bacteria. Strains analyzed in this data set are SYN-PKU101, SYN-PKU102, SYN-PKU202, SYN-PKU201, SYN-PKU401, SYN-PKU402, SYN-PKU203, SYN-PKU302, SYN-PKU303. 
         FIGS. 9A and 9B  depict the state of one non-limiting embodiment of the PAL construct under non-inducing ( FIG. 9A ) and inducing ( FIG. 9B ) conditions.  FIG. 9A  depicts relatively low PAL and PheP production under aerobic conditions due to oxygen (O 2 ) preventing FNR from dimerizing and activating PAL and/or pheP gene expression.  FIG. 9B  depicts up-regulated PAL and PheP production under anaerobic conditions due to FNR dimerizing and inducing FNR promoter-mediated expression of PAL and pheP (squiggle above “PAL” and “pheP”). Arrows adjacent to a single rectangle, or a cluster of rectangles, depict the promoter responsible for driving transcription (in the direction of the arrow) of such gene(s). Arrows above each rectangle depict the expression product of each gene. 
         FIG. 10  depicts phenylalanine concentrations in cultures of synthetic probiotic strains, with and without an additional copy of pheP inserted on the chromosome. After 1.5 hrs of growth, cultures were placed in Coy anaerobic chamber supplying 90% N 2 , 5% CO 2 , and 5% H 2 . After 4 hrs of induction, bacteria were resuspended in assay buffer containing 4 mM phenylalanine. Aliquots were removed from cell assays every 30 min for 3 hrs for phenylalanine quantification by mass spectrometry. Phenylalanine degradation rates in strains comprising an additional copy of pheP (SYN-PKU304 and SYN-PKU305; left) were higher than strains lacking an additional copy of pheP (SYN-PKU308 and SYN-PKU307; right). 
         FIG. 11 . shows that pheP Overexpression Improves Phe Degradation. Strains containing different PAL genes and an additional copy of the gene encoding the pheP transporter were compared with strains lacking the additional pheP gene. Notably, the additional pheP copy permitted the complete degradation of 4 mM Phe in 4 hours in this experiment. 
         FIG. 12 . Shows that cinnamate production is enhanced in pheP+ Strains. Cinnamate production is directly correlated with Phe degradation. pheP+ refers to the Nissle parent strain containing an additional integrated copy of the pheP gene but lacking a PAL circuit. 
         FIG. 13  depicts diseases associated with branched chain amino acid degradative pathways. 
         FIG. 14  depicts aspects of the branched chain amino acid degradative pathway 
         FIG. 15  depicts aspects of the branched chain amino acid degradative pathway 
         FIG. 16  depicts aspects of the branched chain amino acid degradative pathway 
         FIG. 17  depicts possible components of a branched chain amino acid synthetic biotic disclosed herein 
         FIG. 18  depicts possible components of a branched chain amino acid synthetic biotic disclosed herein. 
         FIG. 19  depicts possible components of a branched chain amino acid synthetic biotic disclosed herein 
         FIG. 20  depicts one exemplary branched chain amino acid circuit. Genes shown are high affinity leucine transporter complex (LivKHMGF), the branched chain a-ketoacid decarboxylase (KivD) from  Lactococcus lactis , aldehyde dehydrogenase 2 (Adh2) from  Saccharomyces cerevisiae , and leucine dehydrogenase (Ldh) from  Pseudomonas aeruginosa . The genes for the leucine exporter (LeuE) and ilvC have been deleted. The gene for ilvJ is added which can be under the control of the native, FNR, or constitutive promoter Ptac 
         FIG. 21  depicts exemplary components of a branched chain amino acid synthetic biotic disclosed herein for leucine degradation. 
         FIG. 22  depicts exemplary components of a branched chain amino acid synthetic biotic disclosed herein for leucine import. 
         FIG. 23  depicts one exemplary branched chain amino acid circuit. Genes shown are low affinity BCAA transporter (BmQ), the branched chain a-ketoacid decarboxylase (KivD) from  Lactococcus lactis , aldehyde dehydrogenase from  E. coli  K-12 (PadA), and leuDH derived from  Pseudomonas aeruginosa  PA01 or  Bacillus cereus . The genes for the leucine exporter (LeuE) and ilvC have been deleted. The gene for ilvJ is added. 
         FIG. 24  depicts one exemplary branched chain amino acid circuit. Genes shown are high affinity leucine transporter complex (LivKHMGF), the branched chain a-ketoacid decarboxylase (KivD) from  Lactococcus lactis , aldehyde dehydrogenase from  E. coli  K-12 (PadA), and leuDH derived from  Pseudomonas aeruginosa  PA01 or  Bacillus cereus . The genes for the leucine exporter (LeuE) and ilvC have been deleted. The gene for BmQ is added. 
         FIG. 25  depicts one exemplary branched chain amino acid circuit. Genes shown are high affinity leucine transporter complex (LivKHMGF), the branched chain a-ketoacid decarboxylase (KivD) from  Lactococcus lactis , either aldehyde dehydrogenase from  E. coli  K-12 (PadA), alcohol dehydrogenase YqhD from  E. coli , or alcohol dehydrogenase Adh2 from  S. cerevisiae , and L-AAD derived from  Proteus vulgaris  or  Proteus mirabilis . The genes for the leucine exporter (LeuE) and ilvC have been deleted. The gene for BmQ is added. 
         FIG. 26  depicts one exemplary branched chain amino acid circuit. Genes shown are high affinity leucine transporter complex (LivKHMGF), the branched chain a-ketoacid decarboxylase (KivD) from  Lactococcus lactis , either aldehyde dehydrogenase from  E. coli  K-12 (PadA), alcohol dehydrogenase YqhD from  E. coli , or alcohol dehydrogenase Adh2 from  S. cerevisiae , and L-AAD derived from  Proteus vulgaris  or  Proteus mirabilis . The genes for the leucine exporter (LeuE) and ilvC have been deleted. The gene for BmQ is added. The genes are under the control of the FNR promoter. 
         FIG. 27  depicts one exemplary branched chain amino acid circuit. Genes shown are high affinity leucine transporter complex (LivKHMGF), the branched chain a-ketoacid decarboxylase (KivD) from  Lactococcus lactis , either aldehyde dehydrogenase from  E. coli  K-12 (PadA), alcohol dehydrogenase YqhD from  E. coli , or alcohol dehydrogenase Adh2 from  S. cerevisiae , and LeuDh derived from  Pseudomonas aeruginosa  PA01 or  Bacillus cereus . The genes for the leucine exporter (LeuE) and ilvC have been deleted. The gene for BmQ is added. The genes are under the control of the FNR promoter. 
         FIG. 28  depicts one exemplary branched chain amino acid circuit. Genes shown are high affinity leucine transporter complex (LivKHMGF), the branched chain a-ketoacid decarboxylase (KivD) from  Lactococcus lactis , either aldehyde dehydrogenase from  E. coli  K-12 (PadA), alcohol dehydrogenase YqhD from  E. coli , or alcohol dehydrogenase Adh2 from  S. cerevisiae , and BCAA aminotransferase ilvE. The genes for the leucine exporter (LeuE) and ilvC have been deleted. The gene for BmQ is added. The genes are under the control of the FNR promoter. 
         FIG. 29  depicts examples of circuit components for ldh, kivD and livKHMGF inducible expression in  E. coli.    
         FIG. 30  depicts leucine levels in the Nissle ΔleuE deletion strain harboring a high-copy plasmid expressing kivD from the Tet promoter or further with a copy of the livKHMGF operon driven by the Tet promoter integrated into the chromosome at the lacZ locus, which were induced with ATC and incubated in culture medium supplemented with 2 mM leucine. Samples were removed at 0, 1.5, 6 and 18 h, and leucine concentration was determined by liquid chromatography tandem mass spectrometry. 
         FIG. 31  depicts leucine degradation in the Nissle ΔleuE deletion strain harboring a high-copy plasmid expressing the branch-chain keto-acid dehydrogenase (bkd) complex with or without expression of a leucine dehydrogenase (ldh) from the Tet promoter or further with a copy of the leucine importer livKHMGF driven by the Tet promoter integrated into the chromosome at the lacZ locus, which were induced with ATC and incubated in culture medium supplemented with 2 mM leucine. Samples were removed at 0, 1.5, 6 and 18 h, and leucine concentration was determined by liquid chromatography tandem mass spectrometry. 
         FIGS. 32A, 32B, and 32C  depict the simultaneous degradation of leucine ( FIG. 32A ), isoleucine ( FIG. 32B ), and valine ( FIG. 32C ) by  E. coli  Nissle and its ΔleuE deletion strain harboring a high-copy plasmid expressing the keto-acid decarboxylase kivD from the Tet promoter or further with a copy of the livKHMGF operon driven by the Tet promoter integrated into the chromosome at the lacZ locus, which were induced with ATC and incubated in culture medium supplemented with 2 mM leucine, 2 mM isoleucine and 2 mM valine. Samples were removed at 0, 1.5, 6 and 18 h, and leucine concentration was determined by liquid chromatography tandem mass spectrometry. 
         FIG. 33  shows that overexpression of the low-affinity BCAA transporter BmQ greatly improves the rate of leucine degradation in a LeuE and ilvC knockout bacterial strain having either LeuDH derived from  P. aeruginosa  or LeuDH derived from  Bacillus cereus , kivD, and padA with and without the BCAA transporter bmQ under the control of tet promoter as measured by leucine degradation, KIC production, and isovalerate production. 
         FIG. 34  is schematic depicting an exemplary Adenosine Degradation Circuit. Adenosine is imported into the cell through expression of the  E. coli  Nucleoside Permease nupG transporter. Adenosine is converted to Inosine through expression of Adenine Deaminase add. Inosine is converted to hypoxyxanthine through expression of Inosine Phosphorylase, xapA, and deoD. Hypoxanthine is converted to Xanthine and Urate through expression of Hypoxanthine Hydroxylase, xdhA, xdhB, xdhC. All of these genes are optionally expressed from an inducible promoter, e.g., a FNR-inducible promoter. The bacteria may also include an auxotrophy, e.g., deletion of thyA (Δ thyA; thymindine dependence). Non-limiting example of a bacterial strain is listed. 
         FIG. 35 . is a schematic depicting an exemplary circuit for depleting kynurenine. 
         FIG. 36 . shows the results of an adaptive laboratory evolution to select a bacterial mutant with enhanced kynurenine import into the cell. The results of the initial checkerboard assay are displayed as a function of optical density at 600 nm. The X-axis shows decreasing KYNU concentration from left-to-right, while the Z-axis shows decreasing ToxTrp concentration from front-to-back with the very back row representing media with no ToxTrp. 
         FIG. 37 . shows the results of an adaptive laboratory evolution to select a bacterial mutant with enhanced kynurenine import into the cell. 
         FIG. 38 . shows the results of an adaptive laboratory evolution to select a bacterial mutant with enhanced kynurenine import into the cell. The control strains SYN094 and trpE are shown in M9+KYNU without any ToxTrp, as there was no growth detected from either strain at any concentration of ToxTrp. The results of the assay show that expression of the pseudoKYNase provides protection against toxicity of ToxTrp and shows that growth is permitted between 250-62.5 ug/mL of KYNU and 6.3-1.55 ug/mL of ToxTrp. 
         FIG. 39 . is a schematic depicting an exemplary circuit for treating hepatic encephalopathy. 
         FIG. 40 . is a schematic depicting an exemplary circuit for depleting bile salts. 
     
    
    
     DETAILED DESCRIPTION 
     The invention includes genetically engineered microorganisms, e.g., genetically engineered bacteria, pharmaceutical compositions thereof, and methods of modulating or treating a disease. 
     In order that the disclosure may be more readily understood, certain terms are first defined. These definitions should be read in light of the remainder of the disclosure and as understood by a person of ordinary skill in the art. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by a person of ordinary skill in the art. Additional definitions are set forth throughout the detailed description. 
     The articles “a” and “an,” as used herein, should be understood to mean “at least one,” unless clearly indicated to the contrary. 
     The phrase “and/or,” when used between elements in a list, is intended to mean either (1) that only a single listed element is present, or (2) that more than one element of the list is present. For example, “A, B, and/or C” indicates that the selection may be A alone; B alone; C alone; A and B; A and C; B and C; or A, B, and C. The phrase “and/or” may be used interchangeably with “at least one of” or “one or more of” the elements in a list. 
     As used herein, the term “amino acid” refers to a class of organic compounds that contain at least one amino group and one carboxyl group. Amino acids include leucine, isoleucine, valine, arginine, lysine, asparagine, serine, glycine, glutamine, tryptophan, methionine, threonine, cysteine, tyrosine, phenylalanine, glutamic acid, aspartic acid, alanine, histidine, and proline. 
     As used herein, the term “auxotroph” or “auxotrophic” refers to an organism that requires a specific factor, e.g., an amino acid, a sugar, or other nutrient, to support its growth. An “auxotrophic modification” is a genetic modification that causes the organism to die in the absence of an exogenously added nutrient essential for survival or growth because it is unable to produce said nutrient. As used herein, the term “essential gene” refers to a gene which is necessary to for cell growth and/or survival. Essential genes are described in more detail infra and include, but are not limited to, DNA synthesis genes (such as thyA), cell wall synthesis genes (such as dapA), and amino acid genes (such as serA and metA). 
     “Cancer” or “cancerous” is used to refer to a physiological condition that is characterized by unregulated cell growth. In some embodiments, cancer refers to a tumor. “Tumor” is used to refer to any neoplastic cell growth or proliferation or any pre-cancerous or cancerous cell or tissue. A tumor may be malignant or benign. Types of cancer include, but are not limited to, adrenal cancer, adrenocortical carcinoma, anal cancer, appendix cancer, bile duct cancer, bladder cancer, bone cancer (e.g., Ewing sarcoma tumors, osteosarcoma, malignant fibrous histiocytoma), brain cancer (e.g., astrocytomas, brain stem glioma, craniopharyngioma, ependymoma), bronchial tumors, central nervous system tumors, breast cancer, Castleman disease, cervical cancer, colon cancer, rectal cancer, colorectal cancer, endometrial cancer, esophageal cancer, eye cancer, gallbladder cancer, gastrointestinal cancer, gastrointestinal carcinoid tumors, gastrointestinal stromal tumors, gestational trophoblastic disease, heart cancer, Kaposi sarcoma, kidney cancer, largyngeal cancer, hypopharyngeal cancer, leukemia (e.g., acute lymphoblastic leukemia, acute myeloid leukemia, chronic lymphocytic leukemia, chronic myelogenous leukemia), liver cancer, lung cancer, lymphoma (e.g., AIDS-related lymphoma, Burkitt lymphoma, cutaneous T cell lymphoma, Hodgkin lymphoma, Non-Hodgkin lymphoma, primary central nervous system lymphoma), malignant mesothelioma, multiple myeloma, myelodysplastic syndrome, nasal cavity cancer, paranasal sinus cancer, nasopharyngeal cancer, neuroblastoma, oral cavity cancer, oropharyngeal cancer, osteosarcoma, ovarian cancer, pancreatic cancer, penile cancer, pituitary tumors, prostate cancer, retinoblastoma, rhabdomyosarcoma, rhabdoid tumor, salivary gland cancer, sarcoma, skin cancer (e.g., basal cell carcinoma, melanoma), small intestine cancer, stomach cancer, teratoid tumor, testicular cancer, throat cancer, thymus cancer, thyroid cancer, unusual childhood cancers, urethral cancer, uterine cancer, uterine sarcoma, vaginal cancer, vulvar cancer, Waldenström macrogloblulinemia, and Wilms tumor. Side effects of cancer treatment may include, but are not limited to, opportunistic autoimmune disorder(s), systemic toxicity, anemia, loss of appetite, irritation of bladder lining, bleeding and bruising (thrombocytopenia), changes in taste or smell, constipation, diarrhea, dry mouth, dysphagia, edema, fatigue, hair loss (alopecia), infection, infertility, lymphedema, mouth sores, nausea, pain, peripheral neuropathy, tooth decay, urinary tract infections, and/or problems with memory and concentration (National Cancer Institute). 
     As used herein, the term “coding region” refers to a nucleotide sequence that codes for a specific amino acid sequence. The term “regulatory sequence” refers to a nucleotide sequence located upstream (5′ non-coding sequences), within, or downstream (3′ non-coding sequences) of a coding sequence, and which influences the transcription, RNA processing, RNA stability, or translation of the associated coding sequence. Examples of regulatory sequences include, but are not limited to, promoters, translation leader sequences, effector binding sites, and stem-loop structures. In one embodiment, the regulatory sequence comprises a promoter, e.g., an FNR responsive promoter. 
     As used herein the term “codon-optimized” refers to the modification of codons in a gene or a coding region of a nucleic acid molecule to improve translation in a host cell or organism of a transcript RNA molecule transcribed from the coding sequence, or to improve transcription of a coding sequence. Codon optimization includes, but is not limited to, processes including selecting codons for the coding sequence to suit the codon preference of the expression host organism. Such optimization includes replacing at least one, or more than one, or a significant number, of codons with one or more codons that are more frequently used in the genes of the host organism. 
     Many organisms display a bias or preference for use of particular codons to code for insertion of a particular amino acid in a growing polypeptide chain. Codon preference or codon bias, differences in codon usage between organisms, is allowed by the degeneracy of the genetic code, and is well documented among many organisms. Codon bias often correlates with the efficiency of translation of messenger RNA (mRNA), which is in turn believed to be dependent on, inter ala, the properties of the codons being translated and the availability of particular transfer RNA (tRNA) molecules. The predominance of selected tRNAs in a cell is generally a reflection of the codons used most frequently in peptide synthesis. Accordingly, genes can be tailored for optimal gene expression in a given organism based on codon optimization. 
     “Constitutive promoter” refers to a promoter that is capable of facilitating continuous transcription of a coding sequence or gene under its control and/or to which it is operably linked. Constitutive promoters and variants are well known in the art and include, but are not limited to, BBa_J23100, a constitutive  Escherichia coli σ   s  promoter (e.g., an osmY promoter (International Genetically Engineered Machine (iGEM) Registry of Standard Biological Parts Name BBa_J45992; BBa_J45993)), a constitutive  Escherichia  coli σ 32  promoter (e.g., htpG heat shock promoter (BBa_J45504)), a constitutive  Escherichia coli σ   70  promoter (e.g., lacq promoter (BBa_J54200; BBa_J56015),  E. coli  CreABCD phosphate sensing operon promoter (BBa_J64951), GlnRS promoter (BBa_K088007), lacZ promoter (BBa_K119000; BBa_K119001); M13K07 gene I promoter (BBa_M13101); M13K07 gene II promoter (BBa_M13102), M13K07 gene III promoter (BBa_M13103), M13K07 gene IV promoter (BBa_M13104), M13K07 gene V promoter (BBa_M13105), M13K07 gene VI promoter (BBa_M13106), M13K07 gene VIII promoter (BBa_M13108), M13110 (BBa_M13110)), a constitutive  Bacillus subtilis σ   A  promoter (e.g., promoter veg (BBa_K143013), promoter 43 (BBa_K143013), PliaG (BBa_K823000), P lepA  (BBa_K823002), P veg  (BBa_K823003)), a constitutive  Bacillus subtilis σ   B  promoter (e.g., promoter etc (BBa_K143010), promoter gsiB (BBa_K143011)), a  Salmonella  promoter (e.g., Pspv2 from  Salmonella  (BBa_K112706), Pspv from  Salmonella  (BBa_K112707)), a bacteriophage T7 promoter (e.g., T7 promoter (BBa_I712074; BBa_I719005; BBa_J34814; BBa_J64997; BBa_K113010; BBa_K113011; BBa_K113012; BBa_R0085; BBa_R0180; BBa_R0181; BBa_R0182; BBa_R0183; BBa_Z0251; BBa_Z0252; BBa_Z0253)), and a bacteriophage SP6 promoter (e.g., SP6 promoter (BBa_J64998)). 
     The term “excipient” refers to an inert substance added to a pharmaceutical composition to further facilitate administration of an active ingredient. Examples include, but are not limited to, calcium bicarbonate, calcium phosphate, various sugars and types of starch, cellulose derivatives, gelatin, vegetable oils, polyethylene glycols, and surfactants, including, for example, polysorbate 20. 
     “Exogenous environmental condition(s)” refer to setting(s) or circumstance(s) under which the promoter described herein is induced. The phrase “exogenous environmental conditions” is meant to refer to the environmental conditions external to the intact (unlysed) recombinant micororganism, but endogenous or native to the host subject environment. Thus, “exogenous” and “endogenous” may be used interchangeably to refer to environmental conditions in which the environmental conditions are endogenous to a mammalian body, but external or exogenous to an intact microorganism cell. In some embodiments, the exogenous environmental conditions are low-oxygen, microaerobic, or anaerobic conditions, such as hypoxic and/or necrotic tissues. In some embodiments, the exogenous environmental condition is a low-pH environment. In some embodiments, the recombinant bacterial cell of the disclosure comprise a pH-dependent promoter. In some embodiments, the recombinant bacterial cell of the disclosure comprise an oxygen level-dependent promoter. In some aspects, bacteria have evolved transcription factors that are capable of sensing oxygen levels (i.e., oxygen-level dependent transcription factors). Different signaling pathways may be triggered by different oxygen levels and occur with different kinetics. An “oxygen level-dependent promoter” or “oxygen level-dependent regulatory region” refers to a nucleic acid sequence to which one or more oxygen level-sensing transcription factors is capable of binding, wherein the binding and/or activation of the corresponding transcription factor activates downstream gene expression. 
     Examples of oxygen level-dependent transcription factors include, but are not limited to, FNR (fumarate and nitrate reductase)-responsive promoters, ANR (anaerobic nitrate respiration)-responsive promoters, and DNR (dissimilatory nitrate respiration regulator)-responsive promoters. Multiple FNR-responsive promoters, ANR-responsive promoters, and DNR-responsive promoters which can be used in the present invention are known in the art (see, e.g., Castiglione et al. (2009) Microbiology 155(Pt. 9): 2838-44; Eiglmeier et al. (1989)  Mol. Microbiol.  3(7): 869-78; Galimand et al. (1991)  J. Bacteriol.  173(5): 1598-1606; Hasegawa et al. (1998)  FEMS Microbiol. Lett.  166(2): 213-217; Hoeren et al. (1993) Eur. J. Biochem. 218(1): 49-57; Salmon et al. (2003)  J. Biol. Chem.  278(32): 29837-55), and non-limiting examples are shown in Table 1. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 Examples of transcription factors and 
               
               
                 responsive genes and regulatory regions 
               
            
           
           
               
               
               
            
               
                   
                 Transcription 
                 Examples of responsive genes, 
               
               
                   
                 Factor 
                 promoters, and/or regulatory regions: 
               
               
                   
                   
               
               
                   
                 FNR 
                 nirB, ydfZ, pdhR, focA, ndH, hlyE, narK, 
               
               
                   
                   
                 narX, narG, yfiD, tdcD 
               
               
                   
                 ANR 
                 arcDABC 
               
               
                   
                 DNR 
                 norb, norC 
               
               
                   
                   
               
            
           
         
       
     
     In a non-limiting example, a promoter (PfnrS) from the  E. coli  Nissle fumarate and nitrate reductase gene S (fnrS) that is known to be highly expressed under conditions of low or no environmental oxygen can be used in the present invention (Durand and Storz, 2010; Boysen et al, 2010). The PfnrS promoter is activated under anaerobic conditions by the global transcriptional regulator FNR that is naturally found in  E. coli  Nissle. Under anaerobic conditions, FNR forms a dimer and binds to specific sequences in the promoters of genes under its control, thereby activating their expression. However, under aerobic conditions, oxygen reacts with iron-sulfur clusters in FNR dimers and converts them to an inactive form. In this way, the PfnrS inducible promoter is adopted to modulate the expression of proteins or RNA. PfnrS is used interchangeably in this application as “FNRS”, “fnrs”, “FNR”, “P-FNRS” promoter and other such related designations to indicate the promoter PfnrS. 
     As used herein, the term “expression” refers to the transcription and stable accumulation of sense (mRNA) or anti-sense RNA derived from a nucleic acid, and/or to translation of an mRNA into a polypeptide. 
     As used herein, the term “gene” refers to a nucleic acid fragment that encodes a protein or a fragment thereof, optionally including regulatory sequences preceding (5′ non-coding sequences) and following (3′ non-coding sequences) the coding sequence. In one embodiment, a “gene” does not include regulatory sequences preceding and following the coding sequence. A “native gene” refers to a gene as found in nature, optionally with its own regulatory sequences preceding and following the coding sequence. A “chimeric gene” refers to any gene that is not a native gene, optionally comprising regulatory sequences preceding and following the coding sequence, wherein the coding sequence and/or the regulatory sequence, in whole or in part, are not found together in nature. Thus, a chimeric gene may comprise a regulatory sequence and a coding sequence, each derived from different sources, or a regulatory and a coding sequence each derived from the same source, but arranged differently than they are found in nature. 
     The term “genetic modification,” as used herein, refers to any genetic change. Exemplary genetic modifications include those that increase, decrease, or abolish the expression of a gene, including, for example, modifications of native chromosomal or extrachromosomal genetic material. Exemplary genetic modifications also include the introduction of at least one plasmid, modification, mutation, base deletion, base addition, and/or codon modification of chromosomal or extrachromosomal genetic sequence(s), gene over-expression, gene amplification, gene suppression, promoter modification or substitution, gene addition (either single or multi-copy), antisense expression or suppression, or any other change to the genetic elements of a host cell, whether the change produces a change in phenotype or not. Genetic modification can include the introduction of a plasmid, e.g., a plasmid comprising at least one substrate transporter operably linked to a promoter, into a bacterial cell. Genetic modification can also involve a targeted replacement in the chromosome, e.g., to replace a native gene promoter with an inducible promoter, regulated promoter, strong promoter, weak promoter, or constitutive promoter. Genetic modification can also involve gene amplification, e.g., introduction of at least one additional copy of a native gene into the chromosome of the cell. Alternatively, chromosomal genetic modification can involve a genetic mutation. 
     As used herein, the term “genetic mutation” refers to a change or multiple changes in a nucleotide sequence of a gene or related regulatory region that alters the nucleotide sequence as compared to its native or wild-type sequence. Mutations include, for example, substitutions, insertions, and deletions, in whole or in part, within the wild-type sequence. Such substitutions, insertions, or deletions can be single nucleotide changes (e.g., one or more point mutations), or can be two or more nucleotide changes, which may result in substantial changes to the sequence. Mutations can occur within the coding region of the gene as well as within the non-coding and regulatory sequence of the gene. The term “genetic mutation” is intended to include silent and conservative mutations within a coding region as well as changes which alter the amino acid sequence of the polypeptide encoded by the gene. A genetic mutation in a gene coding sequence may, for example, increase, decrease, or otherwise alter the activity (e.g., import activity) of the polypeptide product encoded by the gene. A genetic mutation in a regulatory sequence may increase, decrease, or otherwise alter the expression of sequences operably linked to the altered regulatory sequence. 
     It is routine for one of ordinary skill in the art to make mutations in a gene of interest. Mutations include substitutions, insertions, deletions, and/or truncations of one or more specific amino acid residues or of one or more specific nucleotides or codons in the polypeptide or polynucleotide of interest. Mutagenesis and directed evolution methods are well known in the art for creating variants. See, e.g., U.S. Pat. Nos. 7,783,428; 6,586,182; 6,117,679; and Ling, et al., 1999, “Approaches to DNA mutagenesis: an overview,”  Anal. Biochem.,  254(2):157-78; Smith, 1985, “In vitro mutagenesis,”  Ann. Rev. Genet.,  19:423-462; Carter, 1986, “Site-directed mutagenesis,”  Biochem. J.,  237:1-7; and Minshull, et al., 1999, “Protein evolution by molecular breeding,”  Current Opinion in Chemical Biology,  3:284-290. For example, the lambda red system can be used to knock-out genes in  E. coli  (see, e.g., Datta et al.,  Gene,  379:109-115 (2006)). 
     “Gut” refers to the organs, glands, tracts, and systems that are responsible for the transfer and digestion of food, absorption of nutrients, and excretion of waste. In humans, the gut comprises the gastrointestinal (GI) tract, which starts at the mouth and ends at the anus, and additionally comprises the esophagus, stomach, small intestine, and large intestine. The gut also comprises accessory organs and glands, such as the spleen, liver, gallbladder, and pancreas. The upper gastrointestinal tract comprises the esophagus, stomach, and duodenum of the small intestine. The lower gastrointestinal tract comprises the remainder of the small intestine, i.e., the jejunum and ileum, and all of the large intestine, i.e., the cecum, colon, rectum, and anal canal. Bacteria can be found throughout the gut, e.g., in the gastrointestinal tract, and particularly in the intestines. 
     As used herein, “heterologous” as used in the context of a nucleic acid or polypeptide sequence, “heterologous gene”, or “heterologous sequence”, refers to a nucleotide or polypeptide sequence that is not normally found in a given cell in nature. As used herein, a heterologous sequence encompasses a nucleic acid sequence that is exogenously introduced into a given cell. “Heterologous gene” includes a native gene, or fragment thereof, that has been introduced into the host cell in a form that is different from the corresponding native gene. For example, a heterologous gene may include a native coding sequence that is a portion of a chimeric gene to include a native coding sequence that is a portion of a chimeric gene to include non-native regulatory regions that is reintroduced into the host cell. A heterologous gene may also include a native gene, or fragment thereof, introduced into a non-native host cell. Thus, a heterologous gene may be foreign or native to the recipient cell; a nucleic acid sequence that is naturally found in a given cell but expresses an unnatural amount of the nucleic acid and/or the polypeptide which it encodes; and/or two or more nucleic acid sequences that are not found in the same relationship to each other in nature. As used herein, the term “endogenous gene” refers to a native gene in its natural location in the genome of an organism. As used herein, the term “transgene” refers to a gene that has been introduced into the host organism, e.g., host bacterial cell, genome. 
     The term “inactivated” as applied to a gene refers to any genetic modification that decreases or eliminates the expression of the gene and/or the functional activity of the corresponding gene product (mRNA and/or protein). The term “inactivated” encompasses complete or partial inactivation, suppression, deletion, interruption, blockage, promoter alterations, antisense RNA, dsRNA, or down-regulation of a gene. This can be accomplished, for example, by gene “knockout,” inactivation, mutation (e.g., insertion, deletion, point, or frameshift mutations that disrupt the expression or activity of the gene product), or by use of inhibitory RNAs (e.g., sense, antisense, or RNAi technology). A deletion may encompass all or part of a gene&#39;s coding sequence. The term “knockout” refers to the deletion of most (at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%) or all (100%) of the coding sequence of a gene. In some embodiments, any number of nucleotides can be deleted, from a single base to an entire piece of a chromosome. 
     An “inducible promoter” refers to a regulatory nucleic acid region that is operably linked to one or more genes, wherein transcription of the gene(s) is increased in response to a stimulus (e.g., an inducer) or an exogenous environmental condition. A “directly inducible promoter” refers to a regulatory region, wherein the regulatory region is operably linked to a gene encoding a protein or polypeptide, where, in the presence of an inducer of said regulatory region, the protein or polypeptide is expressed. An “indirectly inducible promoter” refers to a regulatory system comprising two or more regulatory regions, for example, a first regulatory region that is operably linked to a first gene encoding a first protein, polypeptide, or factor, e.g., a transcriptional regulator, which is capable of regulating a second regulatory region that is operably linked to a second gene, the second regulatory region may be activated or repressed, thereby activating or repressing expression of the second gene. Both a directly inducible promoter and an indirectly inducible promoter are encompassed by “inducible promoter.” Examples of inducible promoters include, but are not limited to, an FNR promoter, a P araC  promoter, a P araBAD  promoter, a propionate promoter, and a P TetR  promoter, each of which are described in more detail herein. Examples of other inducible promoters are provided herein below. 
     An “isolated” polypeptide, or a fragment, variant, or derivative thereof, refers to a polypeptide that is not in its natural milieu. No particular level of purification is required. Recombinantly-produced polypeptides and proteins expressed in host cells, including but not limited to bacterial or mammalian cells, are considered isolated for purposed of the invention, as are native or recombinant polypeptides which have been separated, fractionated, or partially or substantially purified by any suitable technique. Recombinant peptides, polypeptides or proteins refer to peptides, polypeptides or proteins produced by recombinant DNA techniques, i.e. produced from cells, microbial or mammalian, transformed by an exogenous recombinant DNA expression construct encoding the polypeptide. Proteins or peptides expressed in most bacterial cultures will typically be free of glycan. Fragments, derivatives, analogs or variants of the foregoing polypeptides, and any combination thereof are also included as polypeptides. The terms “fragment,” “variant,” “derivative” and “analog” include polypeptides having an amino acid sequence sufficiently similar to the amino acid sequence of the original peptide and include any polypeptides, which retain at least one or more properties of the corresponding original polypeptide. Fragments of polypeptides of the present invention include proteolytic fragments, as well as deletion fragments. Fragments also include specific antibody or bioactive fragments or immunologically active fragments derived from any polypeptides described herein. Variants may occur naturally or be non-naturally occurring. Non-naturally occurring variants may be produced using mutagenesis methods known in the art. Variant polypeptides may comprise conservative or non-conservative amino acid substitutions, deletions or additions. 
     As used herein the term “linker” “linker peptide” or “peptide linkers” or “linker” refers to synthetic or non-native or non-naturally-occurring amino acid sequences that connect or link two polypeptide sequences, e.g., that link two polypeptide domains. As used herein the term “synthetic” refers to amino acid sequences that are not naturally occurring. Exemplary linkers are described herein. Additional exemplary linkers are provided in US 2014/0079701, the contents of which are herein incorporated by reference in its entirety. 
     As used herein, the terms “modulate” and “treat” and their cognates refer to an amelioration of a disease or condition, or at least one discernible symptom thereof. In another embodiment, “modulate” and “treat” refer to an amelioration of at least one measurable physical parameter, not necessarily discernible by the patient. In another embodiment, “modulate” and “treat” refer to inhibiting the progression of a disease or condition, either physically (e.g., stabilization of a discernible symptom), physiologically (e.g., stabilization of a physical parameter), or both. In another embodiment, “modulate” and “treat” refer to slowing the progression or reversing the progression of a disease or condition. As used herein, “prevent” and its cognates refer to delaying the onset or reducing the risk of acquiring a given disease or condition. 
     As used herein, a “non-native” nucleic acid sequence refers to a nucleic acid sequence not normally present in a microorganism, e.g., an extra copy of an endogenous sequence, or a heterologous sequence such as a sequence from a different organism (e.g., an organism from a different species, strain, or substrain of a prokaryote or eukaryote), or a sequence that is modified and/or mutated as compared to the unmodified native or wild-type sequence. In some embodiments, the non-native nucleic acid sequence is a synthetic, non-naturally occurring sequence (see, e.g., Purcell et al., 2013). The non-native nucleic acid sequence may be a regulatory region, a promoter, a gene, and/or one or more genes (e.g., genes in a gene cassette or operon). In some embodiments, “non-native” refers to two or more nucleic acid sequences that are not found in the same relationship to each other in nature. The non-native nucleic acid sequence may be present on a plasmid or chromosome. In some embodiments, the genetically engineered bacteria of the disclosure comprise a gene that is operably linked to a directly or indirectly inducible promoter that is not associated with said gene in nature, e.g., an FNR-responsive promoter (or other promoter described herein) operably linked to a gene encoding a substrate transporter. 
     “Microorganism” refers to an organism or microbe of microscopic, submicroscopic, or ultramicroscopic size that typically consists of a single cell. Examples of microrganisms include bacteria, viruses, parasites, fungi, certain algae, and protozoa. In some aspects, the microorganism is engineered (“engineered microorganism”) to produce one or more anti-cancer molecules. In certain embodiments, the engineered microorganism is an engineered bacteria. In certain embodiments, the engineered microorganism is an engineered oncolytic virus. 
     “Non-pathogenic bacteria” refer to bacteria that are not capable of causing disease or harmful responses in a host. In some embodiments, non-pathogenic bacteria are commensal bacteria. Examples of non-pathogenic bacteria include, but are not limited to  Bacillus, Bacteroides, Bifidobacterium, Brevibacteria, Clostridium, Enterococcus, Escherichia coli, Lactobacillus, Lactococcus, Saccharomyces , and  Staphylococcus , e.g.,  Bacillus coagulans, Bacillus subtilis, Bacteroides fragilis, Bacteroides subtilis, Bacteroides thetaiotaomicron, Bifidobacterium bifidum, Bifidobacterium infantis, Bifidobacterium lactis, Bifidobacterium longum, Clostridium butyricum, Enterococcus faecium, Lactobacillus acidophilus, Lactobacillus bulgaricus, Lactobacillus casei, Lactobacillus johnsonii, Lactobacillus paracasei, Lactobacillus plantarum, Lactobacillus reuteri, Lactobacillus rhamnosus , and  Lactococcus lactis  (Sonnenborn et al., 2009; Dinleyici et al., 2014; U.S. Pat. Nos. 6,835,376; 6,203,797; 5,589,168; 7,731,976). Naturally pathogenic bacteria may be genetically engineered to provide reduce or eliminate pathogenicity. 
     “Operably linked” refers to the association of nucleic acid sequences on a single nucleic acid fragment so that the function of one is affected by the other. A regulatory element is operably linked with a coding sequence when it is capable of affecting the expression of the gene coding sequence, regardless of the distance between the regulatory element and the coding sequence. More specifically, operably linked refers to a nucleic acid sequence that is joined to a regulatory sequence in a manner which allows expression of the nucleic acid sequence. In other words, the regulatory sequence acts in cis. In one embodiment, a gene may be “directly linked” to a regulatory sequence in a manner which allows expression of the gene. In another embodiment, a gene may be “indirectly linked” to a regulatory sequence in a manner which allows expression of the gene. In one embodiment, two or more genes may be directly or indirectly linked to a regulatory sequence in a manner which allows expression of the two or more genes. 
     As used herein, “payload” refers to one or more molecules of interest to be produced by a genetically engineered microorganism, such as a bacteria. In some embodiments, the payload is a therapeutic payload. In some embodiments, the payload is a regulatory molecule, e.g., a transcriptional regulator such as FNR. In some embodiments, the payload comprises a regulatory element, such as a promoter or a repressor. In some embodiments, the payload comprises an inducible promoter, such as from FNRS. In some embodiments the payload comprises a repressor element, such as a kill switch. In some embodiments, the payload is encoded by a gene or multiple genes or an operon. In alternate embodiments, the payload is produced by a biosynthetic or biochemical pathway, wherein the biosynthetic or biochemical pathway may optionally be endogenous to the microorganism. In some embodiments, the genetically engineered microorganism comprises two or more payloads. 
     As used herein a “pharmaceutical composition” refers to a preparation of bacterial cells disclosed herein with other components such as a physiologically suitable carrier and/or excipient. 
     The phrases “physiologically acceptable carrier” and “pharmaceutically acceptable carrier” which may be used interchangeably refer to a carrier or a diluent that does not cause significant irritation to an organism and does not abrogate the biological activity and properties of the administered bacterial compound. An adjuvant is included under these phrases. 
     As used herein, the term “plasmid” or “vector” refers to an extrachromosomal nucleic acid, e.g., DNA, construct that is not integrated into a bacterial cell&#39;s genome. Plasmids are usually circular and capable of autonomous replication. Plasmids may be low-copy, medium-copy, or high-copy, as is well known in the art. Plasmids may optionally comprise a selectable marker, such as an antibiotic resistance gene, which helps select for bacterial cells containing the plasmid and which ensures that the plasmid is retained in the bacterial cell. A plasmid disclosed herein may comprise a nucleic acid sequence encoding a heterologous gene, e.g., a gene encoding at least one substrate transporter. 
     As used herein, the term “polypeptide” includes “polypeptide” as well as “polypeptides,” and refers to a molecule composed of amino acid monomers linearly linked by amide bonds (i.e., peptide bonds). The term “polypeptide” refers to any chain or chains of two or more amino acids, and does not refer to a specific length. Thus, “peptides,” “dipeptides,” “tripeptides, “oligopeptides,” “protein,” “amino acid chain,” or any other term used to refer to a chain or chains of two or more amino acids, are included within the definition of “polypeptide.” and the term “polypeptide” may be used instead of, or interchangeably with, any of these terms. The term “polypeptide” is also intended to refer to the products of post-expression modifications of the polypeptide, including but not limited to glycosylation, acetylation, phosphorylation, amidation, derivatization, proteolytic cleavage, or modification by non-naturally occurring amino acids. A polypeptide may be derived from a natural biological source or produced by recombinant technology. In other embodiments, the polypeptide is produced by the genetically engineered bacteria of the current invention. In some embodiments, a polypeptide of the invention may be of a size of about 3 or more, 5 or more, 10 or more, 20 or more, 25 or more, 50 or more, 75 or more, 100 or more, 200 or more, 500 or more, 1,000 or more, or 2,000 or more amino acids. Polypeptides may have a defined three-dimensional structure, although they must not necessarily have such structure. Polypeptides with a defined three-dimensional structure are referred to as folded, and polypeptides, which do not possess a defined three-dimensional structure, but rather can adopt a large number of different conformations, are referred to herein as unfolded. 
     Polypeptides also include fusion proteins. As used herein, the term “variant” includes a fusion protein, which comprises a sequence of the original peptide or sufficiently similar to the original peptide. As used herein, the term “fusion protein” refers to a chimeric protein comprising amino acid sequences of two or more different proteins. Typically, fusion proteins result from well known in vitro recombination techniques. Fusion proteins may have a similar structural function (but not necessarily to the same extent), and/or similar regulatory function (but not necessarily to the same extent), and/or similar biochemical function (but not necessarily to the same extent) and/or immunological activity (but not necessarily to the same extent) as the individual original proteins which are the components of the fusion proteins. “Derivatives” include but are not limited to peptides, which contain one or more naturally occurring amino acid derivatives of the twenty standard amino acids. “Similarity” between two peptides is determined by comparing the amino acid sequence of one peptide to the sequence of a second peptide. An amino acid of one peptide is similar to the corresponding amino acid of a second peptide if it is identical or a conservative amino acid substitution. Conservative substitutions include those described in Dayhoff, M. O., ed., The Atlas of Protein Sequence and Structure 5, National Biomedical Research Foundation, Washington, D.C. (1978), and in Argos, EMBO J. 8 (1989), 779-785. For example, amino acids belonging to one of the following groups represent conservative changes or substitutions: -Ala, Pro, Gly, Gln, Asn, Ser, Thr; -Cys, Ser, Tyr, Thr; -Val, le, Leu, Met, Ala, Plie; -Lys, Arg, His; -Phe, Tyr, Trp, His; and -Asp, Glu. 
     “Probiotic” is used to refer to live, non-pathogenic microorganisms, e.g., bacteria, which can confer health benefits to a host organism that contains an appropriate amount of the microorganism. In some embodiments, the host organism is a mammal. In some embodiments, the host organism is a human. Some species, strains, and/or subtypes of non-pathogenic bacteria are currently recognized as probiotic bacteria. Examples of probiotic bacteria include, but are not limited to,  Bifidobacteria, Escherichia coli , and  Lactobacillus , e.g.,  Bifidobacterium bifidum, Enterococcus faecium, Escherichia coli  strain Nissle,  Lactobacillus acidophilus, Lactobacillus bulgaricus, Lactobacillus paracasei , and  Lactobacillus plantarum  (Dinleyici et al., 2014; U.S. Pat. Nos. 5,589,168; 6,203,797; 6,835,376). The probiotic may be a variant or a mutant strain of bacterium (Arthur et al., 2012; Cuevas-Ramos et al., 2010; Olier et al., 2012; Nougayrede et al., 2006). Non-pathogenic bacteria may be genetically engineered to enhance or improve desired biological properties, e.g., survivability. Non-pathogenic bacteria may be genetically engineered to provide probiotic properties. Probiotic bacteria may be genetically engineered to enhance or improve probiotic properties. 
     A “promoter” as used herein, refers to a nucleotide sequence that is capable of controlling the expression of a coding sequence or gene. Promoters are generally located 5′ of the sequence that they regulate. Promoters may be derived in their entirety from a native gene, or be composed of different elements derived from promoters found in nature, and/or comprise synthetic nucleotide segments. Those skilled in the art will readily ascertain that different promoters may regulate expression of a coding sequence or gene in response to a particular stimulus, e.g., in a cell- or tissue-specific manner, in response to different environmental or physiological conditions, or in response to specific compounds. Prokaryotic promoters are typically classified into two classes: inducible and constitutive. 
     As used herein, the term “recombinant bacterial cell”, “recombinant bacteria” or “genetically modified bacteria” refers to a bacterial cell or bacteria that have been genetically modified from their native state. For instance, a recombinant bacterial cell may have nucleotide insertions, nucleotide deletions, nucleotide rearrangements, and nucleotide modifications introduced into their DNA. These genetic modifications may be present in the chromosome of the bacteria or bacterial cell, or on a plasmid in the bacteria or bacterial cell. Recombinant bacterial cells of the disclosure may comprise exogenous nucleotide sequences on plasmids. Alternatively, recombinant bacterial cells may comprise exogenous nucleotide sequences stably incorporated into their chromosome. 
     As used herein, “stably maintained” or “stable” bacterium is used to refer to a bacterial host cell carrying non-native genetic material, e.g., an amino acid catabolism enzyme, that is incorporated into the host genome or propagated on a self-replicating extra-chromosomal plasmid, such that the non-native genetic material is retained, expressed, and propagated. The stable bacterium is capable of survival and/or growth in vitro, e.g., in medium, and/or in vivo, e.g., in the gut. For example, the stable bacterium may be a genetically engineered bacterium comprising an substrate transporter gene, in which the plasmid or chromosome carrying the substrate transporter gene is stably maintained in the bacterium, such that the substrate transporter can be expressed in the bacterium, and the bacterium is capable of survival and/or growth in vitro and/or in vivo. In some embodiments, copy number affects the stability of expression of the non-native genetic material. In some embodiments, copy number affects the level of expression of the non-native genetic material. 
     As used herein, the term “sufficiently similar” means a first amino acid sequence that contains a sufficient or minimum number of identical or equivalent amino acid residues relative to a second amino acid sequence such that the first and second amino acid sequences have a common structural domain and/or common functional activity. For example, amino acid sequences that comprise a common structural domain that is at least about 45%, at least about 50%, at least about 55%, at least about 60%, at least about 65%, at least about 70%, at least about 75%, at least about 80%, at least about 85%, at least about 90%, at least about 91%, at least about 92%, at least about 93%. at least about 94%, at least about 95%, at least about 96%, at least about 97%, at least about 98%, at least about 99%, or at least about 100%, identical are defined herein as sufficiently similar. Preferably, variants will be sufficiently similar to the amino acid sequence of the peptides of the invention. Such variants generally retain the functional activity of the peptides of the present invention. Variants include peptides that differ in amino acid sequence from the native and wt peptide, respectively, by way of one or more amino acid deletion(s), addition(s), and/or substitution(s). These may be naturally occurring variants as well as artificially designed ones. 
     The terms “therapeutically effective dose” and “therapeutically effective amount” are used to refer to an amount of a compound that results in prevention, delay of onset of symptoms, or amelioration of symptoms of a condition or disease. A therapeutically effective amount, as well as a therapeutically effective frequency of administration, can be determined by methods known in the art and discussed below. 
     As used herein, the term “transform” or “transformation” refers to the transfer of a nucleic acid fragment into a host bacterial cell, resulting in genetically-stable inheritance. Host bacterial cells comprising the transformed nucleic acid fragment are referred to as “recombinant” or “transgenic” or “transformed” organisms. 
     As used herein, the term “toxin” refers to a protein, enzyme, or polypeptide fragment thereof, or other molecule which is capable of arresting, retarding, or inhibiting the growth, division, multiplication or replication of the recombinant bacterial cell of the disclosure, or which is capable of killing the recombinant bacterial cell of the disclosure. The term “toxin” is intended to include bacteriostatic proteins and bactericidal proteins. The term “toxin” is intended to include, but not limited to, lytic proteins, bacteriocins (e.g., microcins and colicins), gyrase inhibitors, polymerase inhibitors, transcription inhibitors, translation inhibitors, DNases, and RNases. The term “anti-toxin” or “antitoxin,” as used herein, refers to a protein or enzyme which is capable of inhibiting the activity of a toxin. The term anti-toxin is intended to include, but not limited to, immunity modulators, and inhibitors of toxin expression. Examples of toxins and antitoxins are known in the art and described in more detail infra. 
     As used herein, the term “treat” and its cognates refer to an amelioration of a disease, or at least one discernible symptom thereof. In another embodiment, “treat” refers to an amelioration of at least one measurable physical parameter, not necessarily discernible by the patient. In another embodiment, “treat” refers to inhibiting the progression of a disease, either physically (e.g., stabilization of a discernible symptom), physiologically (e.g., stabilization of a physical parameter), or both. In another embodiment, “treat” refers to slowing the progression or reversing the progression of a disease. As used herein, “prevent” and its cognates refer to delaying the onset or reducing the risk of acquiring a given disease. 
     Those in need of treatment may include individuals already having a particular medical disease, as well as those at risk of having, or who may ultimately acquire the disease. The need for treatment is assessed, for example, by the presence of one or more risk factors associated with the development of a disease, the presence or progression of a disease, or likely receptiveness to treatment of a subject having the disease. Disorders associated with or involved with amino acid metabolism, e.g., cancer, may be caused by inborn genetic mutations for which there are no known cures. Diseases can also be secondary to other conditions, e.g., an intestinal disorder or a bacterial infection. Treating diseases associated with amino acid metabolism may encompass reducing normal levels of one or more substrates, e.g., an amino acid, reducing excess levels of one or more substrates, e.g., an amino acid, or eliminating one or more substrates, e.g., an amino acid, and does not necessarily encompass the elimination of the underlying disease. 
     Ranges provided herein are understood to be shorthand for all of the values within the range. For example, a range of 1 to 50 is understood to include any number, combination of numbers, or sub-range from the group consisting 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50. 
     Bacterial Strains 
     The disclosure provides a bacterial cell that comprises a heterologous gene encoding a substrate transporter. In some embodiments, the bacterial cell is a non-pathogenic bacterial cell. In some embodiments, the bacterial cell is a commensal bacterial cell. In some embodiments, the bacterial cell is a probiotic bacterial cell. 
     In certain embodiments, the bacterial cell is selected from the group consisting of a  Bacteroides fragilis, Bacteroides thetaiotaomicron, Bacteroides subtilis, Bifidobacterium animalis, Bifidobacterium bifidum, Bifidobacterium infantis, Bifidobacterium lactis, Clostridium butyricum, Clostridium scindens, Escherichia coli, Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus reuteri, Lactococcus lactis , and  Oxalobacter formigenes  bacterial cell. In one embodiment, the bacterial cell is a  Bacteroides fragilis  bacterial cell. In one embodiment, the bacterial cell is a  Bacteroides  thetaiotaomicron bacterial cell. In one embodiment, the bacterial cell is a  Bacteroides subtilis  bacterial cell. In one embodiment, the bacterial cell is a  Bifidobacterium animalis  bacterial cell. In one embodiment, the bacterial cell is a  Bifidobacterium bifidum  bacterial cell. In one embodiment, the bacterial cell is a  Bifidobacterium infantis  bacterial cell. In one embodiment, the bacterial cell is a  Bifidobacterium lactis  bacterial cell. In one embodiment, the bacterial cell is a  Clostridium butyricum  bacterial cell. In one embodiment, the bacterial cell is a  Clostridium scindens  bacterial cell. In one embodiment, the bacterial cell is an  Escherichia coli  bacterial cell. In one embodiment, the bacterial cell is a  Lactobacillus acidophilus  bacterial cell. In one embodiment, the bacterial cell is a  Lactobacillus plantarum  bacterial cell. In one embodiment, the bacterial cell is a  Lactobacillus reuteri  bacterial cell. In one embodiment, the bacterial cell is a  Lactococcus lactis  bacterial cell. In one embodiment, the bacterial cell is a  Oxalobacter formigenes  bacterial cell. In another embodiment, the bacterial cell does not include  Oxalobacter formigenes.    
     In one embodiment, the bacterial cell is a Gram positive bacterial cell. In another embodiment, the bacterial cell is a Gram negative bacterial cell. 
     In some embodiments, the bacterial cell is  Escherichia coli  strain Nissle 1917 ( E. coli  Nissle), a Gram-negative bacterium of the Enterobacteriaceae family that “has evolved into one of the best characterized probiotics” (Ukena et al., 2007). The strain is characterized by its “complete harmlessness” (Schultz, 2008), and “has GRAS (generally recognized as safe) status” (Reister et al., 2014, emphasis added). Genomic sequencing confirmed that  E. coli  Nissle “lacks prominent virulence factors (e.g.,  E. coli  α-hemolysin, P-fimbrial adhesins)” (Schultz, 2008), and  E. coli  Nissle “does not carry pathogenic adhesion factors and does not produce any enterotoxins or cytotoxins, it is not invasive, not uropathogenic” (Sonnenbom et al., 2009). As early as in 1917,  E. coli  Nissle was packaged into medicinal capsules, called Mutaflor, for therapeutic use.  E. coli  Nissle has since been used to treat ulcerative colitis in humans in vivo (Rembacken et al., 1999), to treat inflammatory bowel disease, Crohn&#39;s disease, and pouchitis in humans in vivo (Schultz, 2008), and to inhibit enteroinvasive  Salmonella, Legionella, Yersinia , and  Shigella  in vitro (Altenhoefer et al., 2004). It is commonly accepted that  E. coli  Nissle&#39;s “therapeutic efficacy and safety have convincingly been proven” (Ukena et al., 2007). 
     In one embodiment, the recombinant bacterial cell of the disclosure does not colonize the subject to whom the cell is administered. 
     One of ordinary skill in the art would appreciate that the genetic modifications disclosed herein may be adapted for other species, strains, and subtypes of bacteria. Furthermore, genes from one or more different species can be introduced into one another. 
     In some embodiments, the bacterial cell is a genetically engineered bacterial cell. In another embodiment, the bacterial cell is a recombinant bacterial cell. In some embodiments, the disclosure comprises a colony of recombinant bacterial cells. 
     In another aspect, the disclosure provides a recombinant bacterial culture which comprises bacterial cells disclosed herein. In one aspect, the disclosure provides a recombinant bacterial culture which reduces levels of a substrate, e.g., an amino acid or a peptide, in the media of the culture. In one embodiment, the levels of substrate is reduced by about 50%, by about 60%, by about 70%, by about 75%, by about 80%, by about 90%, by about 95%, or about 100% in the media of the cell culture. In another embodiment, the levels of a substrate is reduced by about two-fold, three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, in the media of the cell culture. In one embodiment, the levels of a substrate are reduced below the limit of detection in the media of the cell culture. 
     In some embodiments of the above described recombinant bacterial cells, the gene encoding a substrate transporter is present on a plasmid in the bacterium and operatively linked on the plasmid to the promoter that is induced under low-oxygen or anaerobic conditions. In other embodiments, the gene encoding a substrate transporter is present in the bacterial chromosome and is operatively linked in the chromosome to the promoter that is induced under low-oxygen or anaerobic conditions. 
     In some embodiments, the recombinant bacterial cell comprising a heterologous substrate transporter is an auxotroph. In one embodiment, the recombinant bacterial cell is an auxotroph selected from a cysE, ginA, ilvD, leuB, lysA, serA, metA, glyA, hisB, ilvA, pheA, proA, thrC, trpC, tyrA, thyA, uraA, dapA, dapB, dapD, dapE, dapF, flhD, metB, metC, proAB, and thil auxotroph. In some embodiments, the recombinant bacterial cell has more than one auxotrophy, for example, they may be a ΔthyA and ΔdapA auxotroph. 
     In some embodiments, the recombinant bacterial cell comprising a heterologous substrate transporter further comprises a kill-switch circuit, such as any of the kill-switch circuits provided herein. For example, in some embodiments, the recombinant bacterial cells may further comprise one or more genes encoding one or more recombinase(s) under the control of an inducible promoter, and an inverted toxin sequence. In some embodiments, the recombinant bacterial cell further comprises one or more genes encoding an antitoxin. In some embodiments, the recombinant bacterial cell further comprise one or more genes encoding one or more recombinase(s) under the control of an inducible promoter and one or more inverted excision genes, wherein the excision gene(s) encode an enzyme that deletes an essential gene. In some embodiments, the recombinant bacterial cell further comprise one or more genes encoding an antitoxin. In some embodiments, the recombinant bacterial cell further comprises one or more genes encoding a toxin under the control of an promoter having a TetR repressor binding site and a gene encoding the TetR under the control of an inducible promoter that is induced by arabinose, such as P araBAD . In some embodiments, the recombinant bacterial cell further comprises one or more genes encoding an antitoxin. 
     In some embodiments, the recombinant bacterial cell is an auxotroph comprising a heterologous substrate transporter gene and further comprises a kill-switch circuit, such as any of the kill-switch circuits described herein. 
     In some embodiments of the above described recombinant bacterial cell, the heterologous gene encoding a substrate transporter is present on a plasmid in the bacterium and operatively linked on the plasmid to the promoter that is induced under low-oxygen or anaerobic conditions. In other embodiments, the gene encoding a substrate transporter is present in the bacterial chromosome and is operatively linked in the chromosome to the promoter that is induced under low-oxygen or anaerobic conditions. 
     A. Amino Acid Transporters 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is an amino acid transporter. In one embodiment, the amino acid transporter transports at least one amino acid selected from the group consisting of leucine, isoleucine, valine, arginine, lysine, asparagine, serine, glycine, glutamine, tryptophan, methionine, threonine, cysteine, tyrosine, phenylalanine, glutamic acid, aspartic acid, alanine, histidine, and proline, into the cell. 
     The uptake of amino acids into bacterial cells is mediated by proteins well known to those of skill in the art. Amino acid transporters may be expressed or modified in the bacteria in order to enhance amino acid transport into the cell. Specifically, when the amino acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import more amino acid(s) into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding an amino acid transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding an amino acid transporter and a genetic modification that reduces export of an amino acid, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding an amino acid transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding an amino acid transporter. In some embodiments, the at least one native gene encoding an amino acid transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding an amino acid transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native amino acid transporter, as well as at least one copy of at least one heterologous gene encoding an amino acid transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding an amino acid transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding an amino acid transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding an amino acid transporter, wherein said amino acid transporter comprises an amino acid sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the amino acid sequence of a polypeptide encoded by an amino acid transporter gene disclosed herein. 
     In some embodiments, the amino acid transporter is encoded by an amino acid transporter gene derived from a bacterial genus or species, including but not limited to,  Bacillus, Campylobacter, Clostridium, Escherichia, Lactobacillus, Pseudomonas, Salmonella, Staphylococcus, Bacillus subtilis, Campylobacter jejuni, Clostridium perfringens, Escherichia coli, Lactobacillus delbrueckii, Pseudomonas aeruginosa, Salmonella typhimurium , or  Staphylococcus aureus . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     The present disclosure further comprises genes encoding functional fragments of an amino acid transporter or functional variants of an amino acid transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of an amino acid transporter relates to an element having qualitative biological activity in common with the wild-type amino acid transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated amino acid transporter is one which retains essentially the same ability to import an amino acid into the bacterial cell as does the amino acid transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of an amino acid transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of an amino acid transporter. 
     Assays for testing the activity of an amino acid transporter, a functional variant of an amino acid transporter, or a functional fragment of an amino acid transporter are well known to one of ordinary skill in the art. For example, import of an amino acid may be determined using the methods as described in Haney et al.,  J. Bact.,  174(1):108-15, 1992; Rahmanian et al.,  J. Bact.,  116(3):1258-66, 1973; and Ribardo and Hendrixson,  J. Bact.,  173(22):6233-43, 2011, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, the genes encoding the amino acid transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the amino acid transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding an amino acid transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding an amino acid transporter is mutagenized; mutants exhibiting increased amino acid import are selected; and the mutagenized at least one gene encoding an amino acid transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding an amino acid transporter is mutagenized; mutants exhibiting decreased amino acid import are selected; and the mutagenized at least one gene encoding an amino acid transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding an amino acid transporter operably linked to a promoter. In one embodiment, the at least one gene encoding an amino acid transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding an amino acid transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding an amino acid transporter in nature. In some embodiments, the at least one gene encoding the amino acid transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the amino acid transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the amino acid transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the amino acid transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding an amino acid transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding an amino acid transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding an amino acid transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding an amino acid transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding an amino acid transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding an amino acid transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding an amino acid transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding an amino acid transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the amino acid transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the amino acid transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the amino acid transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the amino acid transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the amino acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more amino acids into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the amino acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more amino acids, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the amino acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more amino acids into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the amino acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more amino acid into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous amino acid transporter and a second heterologous amino acid transporter. In one embodiment, said first amino acid transporter is derived from a different organism than said second amino acid transporter. In some embodiments, said first amino acid transporter is derived from the same organism as said second amino acid transporter. In some embodiments, said first amino acid transporter imports the same amino acid as said second amino acid transporter. In other embodiment, said first amino acid transporter imports a different amino acid from said second amino acid transporter. In some embodiments, said first amino acid transporter is a wild-type amino acid transporter and said second amino acid transporter is a mutagenized version of said first amino acid transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous amino acid transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous amino acid transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous amino acid transporters or more. 
     In one embodiment, the amino acid transporter imports one amino acid into the bacterial cell. In another embodiment, the amino acid transporter imports two amino acids into the bacterial cell. In yet another embodiment, the amino acid transporter imports three amino acids into the bacterial cell. In another embodiment, the amino acid transporter imports four or more amino acids into the cell. In one embodiment, the amino acid transporter is an arginine transporter. In another embodiment, the amino acid transporter is an asparagine transporter. In another embodiment, the amino acid transporter is a serine transporter. In another embodiment, the amino acid transporter is an transporter of glycine. In another embodiment, the amino acid transporter is a tryptophan transporter. In another embodiment, the amino acid transporter is a methionine transporter. In another embodiment, the amino acid transporter is a threonine transporter. In another embodiment, the amino acid transporter is a cysteine transporter. In another embodiment, the amino acid transporter is a tyrosine transporter. In another embodiment, the amino acid transporter is a phenylalanine transporter. In another embodiment, the amino acid transporter is a glutamic acid transporter. In another embodiment, the amino acid transporter is a histidine transporter. In another embodiment, the amino acid transporter is a proline transporter. In another embodiment, the amino acid transporter is an transporter of leucine. In another embodiment, the amino acid transporter is an transporter of isoleucine. In another embodiment, the amino acid transporter is an transporter of valine. In another embodiment, the amino acid transporter is a lysine transporter. In another embodiment, the amino acid transporter is a glutamine transporter. In another embodiment, the amino acid transporter is an transporter of aspartic acid. In another embodiment, the amino acid transporter is an transporter of alanine. In another embodiment, the amino acid transporter is an transporter of branched chain amino acids. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding an amino acid transporter may be used to treat a disease, condition, and/or symptom associated with amino acid metabolism. In some embodiments, disclosed herein are methods for reducing, ameliorating, or eliminating one or more symptom(s) associated with these diseases or disorders. 
     As used herein the terms “disease associated with amino acid metabolism” or a “disorder associated with amino acid metabolism” is a disease or disorder involving the abnormal, e.g., increased, levels of one or more amino acids in a subject. In one embodiment, a disease or disorder associated with amino acid metabolism is a cancer, e.g., a cancer described herein. In another embodiment, a disease or disorder associated with amino acid metabolism is a metabolic disease. In one embodiment, the cancer is glioma. In another embodiment, the cancer is breast cancer. In another embodiment, the cancer is melanoma. In another embodiment, the cancer is hepatocarcinoma. In another embodiment, the cancer is acute lymphoblastic leukemia (ALL). In another embodiment, the cancer is ovarian cancer. In another embodiment, the cancer is prostate cancer. In another embodiment, the cancer is lymphoblastic leukemia. In another embodiment, the cancer is non-small cell lung cancer. 
     Multiple distinct transporters of amino acids are well known in the art and are described in the subsections, below. 
     1. Branched Chain Amino Acid Transporters 
     In one embodiment, the amino acid transporter is a branched chain amino acid transporter. The term “branched chain amino acid” or “BCAA,” as used herein, refers to an amino acid which comprises a branched side chain. Leucine, isoleucine, and valine are naturally occurring amino acids comprising a branched side chain. However, non-naturally occurring, usual, and/or modified amino acids comprising a branched side chain are also encompassed by the term branched chain amino acid. 
     Branched chain amino acid transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance branched chain amino acid transport into the cell. Specifically, when the transporter of branched chain amino acids is expressed in the recombinant bacterial cells described herein, the bacterial cells import more branched chain amino acids into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding an transporter of branched chain amino acids may be used to import one or more branched chain amino acids into the bacteria. 
     The uptake of branched chain amino acids into bacterial cells is mediated by proteins well known to those of skill in the art. For example, two well characterized BCAA transport systems have been characterized in several bacteria, including  Escherichia coli . BCAAs are transported by two systems into bacterial cells (i.e., imported), the osmotic-shock-sensitive systems designated LIV-I and LS (leucine-specific), and by an osmotic-shock resistant system, BrnQ, formerly known as LIV-II (see Adams et al.,  J. Biol. Chem.  265:11436-43 (1990); Anderson and Oxender,  J. Bacteriol.  130:384-92 (1977); Anderson and Oxender,  J. Bacteriol.  136:168-74 (1978); Haney et al.,  J. Bacteriol.  174:108-15 (1992); Landick and Oxender,  J. Biol. Chem.  260:8257-61 (1985); Nazos et al.,  J. Bacteriol.  166:565-73 (1986); Nazos et al.,  J. Bacteriol.  163:1196-202 (1985); Oxender et al.,  Proc. Natl. Acad. Sci. USA  77:1412-16 (1980); Quay et al.,  J. Bacteriol.  129:1257-65 (1977); Rahmanian et al.,  J. Bacteriol.  116:1258-66 (1973); Wood,  J. Biol. Chem.  250:4477-85 (1975); Guardiola et al.,  J. Bacteriol.  117:393-405 (1974); Guardiola and Iaccarino,  J. Bacteriol.  108:1034-44 (1971); Ohnishi et al.,  Jpn. J. Genet.  63:343-57)(1988); Yamato and Anraku,  J. Bacteriol.  144:36-44 (1980); and Yamato et al.,  J. Bacteriol.  138:24-32 (1979)). Transport by the BrnQ system is mediated by a single membrane protein. Transport mediated by the LIV-I system is dependent on the substrate binding protein LivJ (also known as LIV-BP), while transport mediated by LS system is mediated by the substrate binding protein LivK (also known as LS-BP). LivJ is encoded by the livJgene, and binds isoleucine, leucine and valine with K d  values of ˜10 −6  and ˜10 −7  M, while LivK is encoded by the livK gene, and binds leucine with a K d  value of ˜10 −6  M (See Landick and Oxender,  J. Biol. Chem.  260:8257-61 (1985)). Both LivJ and LivK interact with the inner membrane components LivHMGF to enable ATP-hydrolysis-coupled transport of their substrates into the cell, forming the LIV-I and LS transport systems, respectively. The LIV-I system transports leucine, isoleucine and valine, and to a lesser extent serine, threonine and alanine, whereas the LS system only transports leucine. The six genes encoding the  E. coli  LIV-I and LS systems are organized into two transcriptional units, with livKHMGF transcribed as a single operon, and livJ transcribed separately. The  Escherichia coli  liv genes can be grouped according to protein function, with the livJ and livK genes encoding periplasmic binding proteins with the binding affinities described above, the livH and livMgenes encoding inner membrane permeases, and the livG and livF genes encoding cytoplasmic ATPases. 
     In one embodiment, the at least one gene encoding an branched chain amino acid transporter is the brnQ gene. An exemplary sequence for bmQ is provided below. BCAA transporter BmQ from  E. coli : 
     
       
         
           
               
            
               
                 Nucleotide sequence: 
               
               
                 atgacccatcaattaagatcgcgcgatatcatcgctctgggctttatgac 
               
               
                   
               
               
                 atttgcgttgttcgtcggcgcaggtaacattattttccctccaatggtcg 
               
               
                   
               
               
                 gcttgcaggcaggcgaacacgtctggactgcggcattcggcttcctcatt 
               
               
                   
               
               
                 actgccgttggcctaccggtattaacggtagtggcgctggcaaaagttgg 
               
               
                   
               
               
                 cggcggtgttgacagtctcagcacgccaattggtaaagtcgctggcgtac 
               
               
                   
               
               
                 tgctggcaacagtttgttacctggcggtggggccgctttttgctacgccg 
               
               
                   
               
               
                 cgtacagctaccgtttcttttgaagtgggcattgcgccgctgacgggtga 
               
               
                   
               
               
                 ttccgcgctgccgctgtttatttacagcctggtctatttcgctatcgtta 
               
               
                   
               
               
                 ttctggtttcgctctatccgggcaagctgctggataccgtgggcaacttc 
               
               
                   
               
               
                 cttgcgccgctgaaaattatcgcgctggtcatcctgtctgttgccgcaat 
               
               
                   
               
               
                 tatctggccggcgggttctatcagtacggcgactgaggcttatcaaaacg 
               
               
                   
               
               
                 ctgcgttttctaacggcttcgtcaacggctatctgaccatggatacgctg 
               
               
                   
               
               
                 ggcgcaatggtgtttggtatcgttattgttaacgcggcgcgttctcgtgg 
               
               
                   
               
               
                 cgttaccgaagcgcgtctgctgacccgttataccgtctgggctggcctga 
               
               
                   
               
               
                 tggcgggtgttggtctgactctgctgtacctggcgctgttccgtctgggt 
               
               
                   
               
               
                 tcagacagcgcgtcgctggtcgatcagtctgcaaacggtgcggcgatcct 
               
               
                   
               
               
                 gcatgcttacgttcagcatacctttggcggcggcggtagcttcctgctgg 
               
               
                   
               
               
                 cggcgttaatcttcatcgcctgcctggtcacggcggttggcctgacctgt 
               
               
                   
               
               
                 gcttgtgcagaattcttcgcccagtacgtaccgctctcttatcgtacgct 
               
               
                   
               
               
                 ggtgtttatcctcggcggcttctcgatggtggtgtctaacctcggcttga 
               
               
                   
               
               
                 gccagctgattcagatctctgtaccggtgctgaccgccatttatccgccg 
               
               
                   
               
               
                 tgtatcgcactggttgtattaagttttacacgctcatggtggcataattc 
               
               
                   
               
               
                 gtcccgcgtgattgctccgccgatgtttatcagcctgctttttggtattc 
               
               
                   
               
               
                 tcgacgggatcaaggcatctgcattcagcgatatcttaccgtcctgggcg 
               
               
                   
               
               
                 cagcgtttaccgctggccgaacaaggtctggcgtggttaatgccaacagt 
               
               
                   
               
               
                 ggtgatggtggttctggccattatctgggatcgtgcggcaggtcgtcagg 
               
               
                   
               
               
                 tgacctccagcgctcactaa 
               
               
                   
               
               
                 AA sequence: 
               
               
                 MTHQLRSRDIIALGFMTFALFVGAGNIIFPPMVGLQAGEHVWTAAFGFLI 
               
               
                   
               
               
                 TAVGLPVLTVVALAKVGGGVDSLSTPIGKVAGVLLATVCYLAVGPLFATP 
               
               
                   
               
               
                 RTATVSFEVGIAPLTGDSALPLFIYSLVYFAIVILVSLYPGKLLDTVGNF 
               
               
                   
               
               
                 LAPLKIIALVILSVAAIIWPAGSISTATEAYQNAAFSNGFVNGYLTMDTL 
               
               
                   
               
               
                 GAMVFGIVIVNAARSRGVTEARLLTRYTVWAGLMAGVGLTLLYLALFRLG 
               
               
                   
               
               
                 SDSASLVDQSANGAAILHAYVQHTFGGGGSFLLAALIFIACLVTAVGLTC 
               
               
                   
               
               
                 ACAEFFAQYVPLSYRTLVFILGGFSMVVSNLGLSQLIQISVPVLTAIYPP 
               
               
                   
               
               
                 CIALVVLSFTRSWWHNSSRVIAPPMFISLLFGILDGIKASAFSDILPSWA 
               
               
                   
               
               
                 QRLPLAEQGLAWLMPTVVMVVLAIIWDRAAGRQVTSSAH 
               
            
           
         
       
     
     In one embodiment, the at least one gene encoding an branched chain amino acid transporter is the livJgene. In one embodiment, the at least one gene encoding an branched chain amino acid transporter is the livH gene. In one embodiment, the at least one gene encoding an branched chain amino acid transporter is the livM gene. In one embodiment, the at least one gene encoding an branched chain amino acid transporter is the livG gene. In one embodiment, the at least one gene encoding an branched chain amino acid transporter is the livF gene. In one embodiment, the at least one gene encoding an branched chain amino acid transporter is the livKHMGF operon. In one embodiment, the at least one gene encoding an branched chain amino acid transporter is the livK gene. In another embodiment, the livKHMGF operon is an  Escherichia coli  livKHMGF operon. In another embodiment, the at least one gene encoding an branched chain amino acid transporter comprises the livKHMGF operon and the livJgene. In one embodiment, the bacterial cell of the invention has been genetically engineered to comprise at least one heterologous gene encoding a LIV-I system. In one embodiment, the bacterial cell of the invention has been genetically engineered to comprise at least one heterologous gene encoding a LS system. In one embodiment, the bacterial cell of the invention has been genetically engineered to comprise at least one heterologous gene encoding a LIV-I system. In one embodiment, the bacterial cell of the invention has been genetically engineered to comprise at least one heterologous livJgene, and at least one heterologous gene selected from the group consisting of livH, livM, livG, and livF. In one embodiment, the bacterial cell of the invention has been genetically engineered to comprise at least one heterologous livK gene, and at least one heterologous gene selected from the group consisting of livH, livM, livG, and livF. 
     In one embodiment, the branched chain amino acid transporter gene has at least about 80% identity with the uppercase sequence of SEQ ID NO:9. Accordingly, in one embodiment, the branched chain amino acid transporter gene has at least about 90% identity with the uppercase sequence of SEQ ID NO:9. Accordingly, in one embodiment, the branched chain amino acid transporter gene has at least about 95% identity with the uppercase sequence of SEQ ID NO:9. Accordingly, in one embodiment, the branched chain amino acid transporter gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the uppercase sequence of SEQ ID NO:9. In another embodiment, the branched chain amino acid transporter gene comprises the uppercase sequence of SEQ ID NO:9. In yet another embodiment the branched chain amino acid transporter gene consists of the uppercase sequence of SEQ ID NO:9. 
     In one embodiment, the branched chain amino acid transporter gene has at least about 80% identity with the sequence of SEQ ID NO:10. Accordingly, in one embodiment, the branched chain amino acid transporter gene has at least about 90% identity with the sequence of SEQ ID NO:10. Accordingly, in one embodiment, the branched chain amino acid transporter gene has at least about 95% identity with the sequence of SEQ ID NO:10. Accordingly, in one embodiment, the branched chain amino acid transporter gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:10. In another embodiment, the branched chain amino acid transporter gene comprises the sequence of SEQ ID NO:10. In yet another embodiment the branched chain amino acid transporter gene consists of the sequence of SEQ ID NO:10. 
     In some embodiments, the branched chain amino acid transporter is encoded by an branched chain amino acid transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a branched chain amino acid transporter, a functional variant of a branched chain amino acid transporter, or a functional fragment of a branched chain amino acid transporter are well known to one of ordinary skill in the art. For example, import of an amino acid may be determined using the methods as described in Haney et al.,  J. Bact.,  174(1):108-15, 1992; Rahmanian et al.,  J. Bact.,  116(3):1258-66, 1973; and Ribardo and Hendrixson,  J. Bact.,  173(22):6233-43, 2011, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the branched chain amino acid transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more branched chain amino acid into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the transporter of branched chain amino acids is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more branched chain amino acids into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the branched chain amino acid transporter is expressed in the recombinant bacterial cells described herein, the bacterial cell imports two-fold more branched chain amino acids into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the branched chain amino acid transporter is expressed in the recombinant bacterial cell described herein, the bacterial cell import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, or ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more branched chain amino acid into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding a branched chain amino acid transporter may be used to treat a disease, condition, and/or symptom associated with the catabolism of a branched chain amino acid. In some embodiments, disclosed herein are methods for reducing, ameliorating, or eliminating one or more symptom(s) associated with these diseases or disorders. In one embodiment, the disorder involving the catabolism of a branched chain amino acid is a metabolic disorder involving the abnormal catabolism of a branched chain amino acid. Metabolic diseases associated with abnormal catabolism of a branched chain amino acid include maple syrup urine disease (MSUD), isovaleric acidemia, propionic acidemia, methylmalonic acidemia, and diabetes ketoacidosis. In one embodiment, the disease associated with abnormal catabolism of a branched chain amino acid is isovaleric acidemia. In one embodiment, the disease associated with abnormal catabolism of a branched chain amino acid is propionic acidemia. In one embodiment, the disease associated with abnormal catabolism of a branched chain amino acid is methylmalonic acidemia. In another embodiment, the disease associated with abnormal catabolism of a branched chain amino acid is diabetes. 
     2. Arginine Transporters 
     In one embodiment, the amino acid transporter is an arginine transporter. Arginine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance arginine transport into the cell. Specifically, when the arginine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more arginine into the cell when the arginine transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding an arginine transporter which may be used to import arginine into the bacteria. 
     The uptake of arginine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, three different arginine transport systems have been characterized in several bacteria: the arginine-specific system encoded by the artPIQM operon and the artJgene (see, e.g., Wissenbach et al. (1993)  J. Bacteriol.  175(11): 3687-8); the basic amino acid uptake system, known as LAO (lysine, arginine, ornithine) (see, e.g., Rosin et al. (1971)  J. Biol. Chem.  246: 3653-62); and the AO (arginine, ornithine) system (see, e.g., Celis (1977)  J. Bacteriol.  130: 1234-43). Transport by the arginine-specific system is mediated by several proteins encoded by the two transcriptional units, the artPIQM operon and the artJ gene. In this system, ArtP (encoded by artP) is an ATPase, ArtQ and ArtM (encoded by artQ and artM, respectively) are transmembrane proteins, and ArtI and ArtJ (encoded by artl and artJ, respectively) are arginine-binding periplasmic proteins. This system has been well characterized in  Escherichia coli  (see, e.g., Wissenbach U. (1995)  Mol. Microbiol.  17(4): 675-86; Wissenbach et al. (1993)  J. Bacteriol.  175(11): 3687-88). In addition, bacterial systems that are homologous and orthologous of the  E. coli  arginine-specific system have been characterized in other bacterial species, including, for example,  Haemophilus influenzae  (see, e.g., Mironov et al. (1999) Nucleic Acids Res. 27(14): 2981-9). The second arginine transport system, the basic amino acid LAO system, consists of the periplasmic LAO protein (also referred to herein as ArgT; encoded by argT), which binds lysine, arginine and ornithine, and the membranous and membrane-associated proteins of the histidine permease (Q M P complex), encoded by the hisJQMP operon, resulting in the uptake of arginine (see, e.g., Oh et al. (1994)  J. Biol. Chem.  269(42): 26323-30). Members of the basic amino acid LAO system have been well characterized in  Escherichia coli  and  Salmonella enterica . Finally, the third arginine transport system, the AO system, consists of the binding protein AbpS (encoded by abpS) and the ATP hydrolase ArgK (encoded by argK) which mediate the ATP-dependent uptake of arginine (see, e.g., Celis et al. (1998)  J. Bacteriol.  180(18): 4828-33). 
     In one embodiment, the at least one gene encoding an arginine transporter is the artJgene. In one embodiment, the at least one gene encoding an arginine transporter is the artPIQM operon. In one embodiment, the at least one gene encoding an arginine transporter is the artP gene. In one embodiment, the at least one gene encoding an arginine transporter is the artI gene. In one embodiment, the at least one gene encoding an arginine transporter is the artQ gene. In one embodiment, the at least one gene encoding an arginine transporter is the artM gene. In one embodiment, the at least one gene encoding an arginine transporter is the argT gene. In one embodiment, the at least one gene encoding an arginine transporter is the hisJQMP operon. In one embodiment, the at least one gene encoding an arginine transporter is the hisJgene. In one embodiment, the at least one gene encoding an arginine transporter is the hisQ gene. In one embodiment, the at least one gene encoding an arginine transporter is the hisM gene. In one embodiment, the at least one gene encoding an arginine transporter is the hisP gene. In one embodiment, the at least one gene encoding an arginine transporter is the abpS gene. In one embodiment, the at least one gene encoding an arginine transporter is the argK gene. In another embodiment, the at least one gene encoding an arginine transporter comprises the artPIQM operon and the artJgene. In another embodiment, the at least one gene encoding an arginine transporter comprises the hisJQMP operon and the argT gene. In yet another embodiment, the at least one gene encoding an arginine transporter comprises the abpS gene and the argK gene. 
     In one embodiment, the argT gene has at least about 80% identity with the sequence of SEQ ID NO:13. Accordingly, in one embodiment, the argT gene has at least about 90% identity with the sequence of SEQ ID NO:13. Accordingly, in one embodiment, the argT gene has at least about 95% identity with the sequence of SEQ ID NO:13. Accordingly, in one embodiment, the argT gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:13. In another embodiment, the argT gene comprises the sequence of SEQ ID NO:13. In yet another embodiment the argT gene consists of the sequence of SEQ ID NO:13. 
     In one embodiment, the artP gene has at least about 80% identity with the sequence of SEQ ID NO:14. Accordingly, in one embodiment, the artP gene has at least about 90% identity with the sequence of SEQ ID NO:14. Accordingly, in one embodiment, the artP gene has at least about 95% identity with the sequence of SEQ ID NO:14. Accordingly, in one embodiment, the artP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:14. In another embodiment, the artP gene comprises the sequence of SEQ ID NO:14. In yet another embodiment the artP gene consists of the sequence of SEQ ID NO:14. 
     In one embodiment, the artI gene has at least about 80% identity with the sequence of SEQ ID NO:15. Accordingly, in one embodiment, the artI gene has at least about 90% identity with the sequence of SEQ ID NO:15. Accordingly, in one embodiment, the artl gene has at least about 95% identity with the sequence of SEQ ID NO:15. Accordingly, in one embodiment, the artl gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:15. In another embodiment, the artl gene comprises the sequence of SEQ ID NO:15. In yet another embodiment the artI gene consists of the sequence of SEQ ID NO:15. 
     In one embodiment, the artQ gene has at least about 80% identity with the sequence of SEQ ID NO:16. Accordingly, in one embodiment, the artQ gene has at least about 90% identity with the sequence of SEQ ID NO:16. Accordingly, in one embodiment, the artQ gene has at least about 95% identity with the sequence of SEQ ID NO:16. Accordingly, in one embodiment, the artQ gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:16. In another embodiment, the artQ gene comprises the sequence of SEQ ID NO:16. In yet another embodiment the artQ gene consists of the sequence of SEQ ID NO:16. 
     In one embodiment, the artM gene has at least about 80% identity with the sequence of SEQ ID NO:17. Accordingly, in one embodiment, the artM gene has at least about 90% identity with the sequence of SEQ ID NO:17. Accordingly, in one embodiment, the artM gene has at least about 95% identity with the sequence of SEQ ID NO:17. Accordingly, in one embodiment, the artM gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:17. In another embodiment, the artM gene comprises the sequence of SEQ ID NO:17. In yet another embodiment the artM gene consists of the sequence of SEQ ID NO:17. 
     In one embodiment, the artJgene has at least about 80% identity with the sequence of SEQ ID NO:18. Accordingly, in one embodiment, the artJgene has at least about 90% identity with the sequence of SEQ ID NO:18. Accordingly, in one embodiment, the artJ gene has at least about 95% identity with the sequence of SEQ ID NO:18. Accordingly, in one embodiment, the artJ gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:18. In another embodiment, the artJgene comprises the sequence of SEQ ID NO:18. In yet another embodiment the artJgene consists of the sequence of SEQ ID NO:18. 
     In some embodiments, the arginine transporter is encoded by an arginine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Haemophilus, Salmonella, Escherichia coli, Haemophilus influenza, Salmonella enterica , or  Salmonella typhimurium . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of an arginine transporter, a functional variant of an arginine transporter, or a functional fragment of arginine transporter are well known to one of ordinary skill in the art. For example, import of arginine may be determined using the methods as described in Sakanaka et al (2015)  J. Biol. Chem.  290(35): 21185-98, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the arginine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more arginine into the bacterial cell when the arginine transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the arginine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more arginine into the bacterial cell when the arginine transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the arginine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more arginine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the arginine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more arginine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     3. Lysine Transporters 
     In one embodiment, the amino acid transporter is a lysine transporter. Lysine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance lysine transport into the cell. Specifically, when the transporter of lysine is expressed in the recombinant bacterial cells described herein, the bacterial cells import more lysine into the cell when the lysine transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a lysine transporter which may be used to import lysine into the bacteria. 
     The uptake of lysine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, LysP is a lysine-specific permease originally identified in  E. coli , that has now been further characterized in other bacterial species (Steffes et al. (1992)  J. Bacteriol.  174: 3242-9; Trip et al. (2013)  J. Bacteriol.  195(2): 340-50; Nji et al. (2014)  Acta Crystallogr. F Struct. Biol. Commun.  70(Pt 10): 1362-7). Another lysine transporter, YsvH, has been described in  Bacillus , having similarities to the lysine permease LysI of  Corynebacterium glutamicum  (Rodionov et al. (2003)  Nucleic Acids Res.  31(23): 6748-57). 
     In one embodiment, the at least one gene encoding a lysine transporter is the lysP gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous lysP gene. In one embodiment, the at least one gene encoding a lysine transporter is the  Escherichia coli  lysP gene. In one embodiment, the at least one gene encoding a lysine transporter is the  Lactococcus lactis  lysP gene. In one embodiment, the at least one gene encoding a lysine transporter is the  Pseudomonas aeruginosa  lysP gene. In one embodiment, the at least one gene encoding a lysine transporter is the  Klebsiella pneumoniae  lysP gene. 
     In one embodiment, the lysP gene has at least about 80% identity with the sequence of SEQ ID NO:26. Accordingly, in one embodiment, the lysP gene has at least about 90% identity with the sequence of SEQ ID NO:26. Accordingly, in one embodiment, the lysP gene has at least about 95% identity with the sequence of SEQ ID NO:26. Accordingly, in one embodiment, the lysP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:26. In another embodiment, the lysP gene comprises the sequence of SEQ ID NO:26. In yet another embodiment the lysP gene consists of the sequence of SEQ ID NO:26. 
     In one embodiment, the at least one gene encoding a lysine transporter is the ysvH gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous ysvH gene. In one embodiment, the at least one gene encoding a lysine transporter is the  Bacillus subtilis  ysvH gene. In one embodiment, the at least one gene encoding a lysine transporter is the  Bacillus cereus  ysvH gene. In one embodiment, the at least one gene encoding a lysine transporter is the  Bacillus stearothermophilus  ysvH gene. 
     In one embodiment, the at least one gene encoding a lysine transporter is the  Corynebacterium glutamicum  (see, e.g., Seep-Feldhaus et al. (1991)  Mol. Microbiol.  5(12): 2995-3005, the entire contents of which are incorporated herein by reference). 
     In one embodiment, the ysvH gene has at least about 80% identity with the sequence of SEQ ID NO:25. Accordingly, in one embodiment, the ysvH gene has at least about 90% identity with the sequence of SEQ ID NO:25. Accordingly, in one embodiment, the ysvH gene has at least about 95% identity with the sequence of SEQ ID NO:25. Accordingly, in one embodiment, the ysvH gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:25. In another embodiment, the ysvH gene comprises the sequence of SEQ ID NO:25. In yet another embodiment the ysvH gene consists of the sequence of SEQ ID NO:25. 
     In some embodiments, the transporter of lysine is encoded by a lysine transporter gene derived from a bacterial genus or species, including but not limited to,  Bacillus subtilis, Bacillus cereus, Bacillus stearothermophilus, Corynebacterium glutamicum, Escherichia coli, Lactococcus lactis, Pseudomonas aeruginosa , and  Klebsiella pneumoniae . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a lysine transporter, a functional variant of a lysine transporter, or a functional fragment of a lysine transporter are well known to one of ordinary skill in the art. For example, import of lysine may be determined using the methods as described in Steffes et al. (1992)  J. Bacteriol.  174: 3242-9, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the lysine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more lysine into the bacterial cell when the lysine transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the lysine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more lysine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the lysine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more lysine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the transporter of lysine is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more lysine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     4. Asparagine Transporters 
     In one embodiment, the amino acid transporter is an asparagine transporter. Asparagine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance asparagine transport into the cell. Specifically, when the asparagine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more asparagine into the cell when the asparagine transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding an asparagine transporter which may be used to import asparagine into the bacteria. 
     The uptake of asparagine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, two distinct systems for asparagine uptake, distinguishable on the basis of their specificity for asparagine have been identified in  E. coli  (see, e.g., Willis and Woolfolk (1975)  J. Bacteriol.  123: 937-945). The bacterial gene ansP encodes an asparagine permease responsible for asparagine uptake in many bacteria (see, e.g., Jennings et al. (1995)  Microbiology  141: 141-6; Ortuño-Olea and Durán-Vargas (2000)  FEMS Microbiol. Lett.  189(2): 177-82; Barel et al. (2015)  Front. Cell. Infect. Microbiol.  5: 9; and Gouzy et al. (2014)  PLoS Pathog.  10(2): e1003928). 
     In one embodiment, the at least one gene encoding an asparagine transporter is the ansP gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous ansP gene. In one embodiment, the at least one gene encoding an asparagine transporter is the  Escherichia coli  ansP gene. In one embodiment, the at least one gene encoding an asparagine transporter is the  Francisella tularensis  ansP gene. In one embodiment, the at least one gene encoding an asparagine transporter is the  Mycobacterium bovis  ansP2 gene. In one embodiment, the at least one gene encoding an asparagine transporter is the  Salmonella enterica  ansP gene. In one embodiment, the at least one gene encoding an asparagine transporter is the  Yersinia pestis  ansP gene. 
     In one embodiment, the ansP2 gene has at least about 80% identity with the sequence of SEQ ID NO:29. Accordingly, in one embodiment, the ansP2 gene has at least about 90% identity with the sequence of SEQ ID NO:29. Accordingly, in one embodiment, the ansP2 gene has at least about 95% identity with the sequence of SEQ ID NO:29. Accordingly, in one embodiment, the ansP2 gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:29. In another embodiment, the ansP2 gene comprises the sequence of SEQ ID NO:29. In yet another embodiment the ansP2 gene consists of the sequence of SEQ ID NO:29. 
     In some embodiments, the asparagine transporter is encoded by an asparagine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Francisella, Mycobacterium, Salmonella, Yersinia, Escherichia coli, Francisella tularensis, Mycobacterium tuberculosis, Salmonella enterica , or  Yersinia pestis . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of an asparagine transporter, a functional variant of an asparagine transporter, or a functional fragment of asparagine transporter are well known to one of ordinary skill in the art. For example, import of asparagine may be determined using the methods as described in Jennings et al. (1995) Microbiology  141: 141-6, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the transporter of an asparagine is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more asparagine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the asparagine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more asparagine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the asparagine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more asparagine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the asparagine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more asparagine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     5. Serine Transporters 
     In one embodiment, the amino acid transporter is a serine transporter. Serine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance serine transport into the cell. Specifically, when the serine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more serine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a serine transporter which may be used to import serine into the bacteria. 
     The uptake of serine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, SdaC (encoded by the sdaC gene; also known as DcrA) is an inner membrane threonine-insensitive serine transporter that was originally identified in  Escherichia coli  (Shao et al. (1994) Eur. J Biochem. 222: 901-7). Additional serine transporters that have been identified include the Na + /serine symporter, SstT (encoded by the sstT gene), the leucine-isoleucine-valine transporter LIV-1, which transports serine slowly, and the H + /serine-threonine symporter TdcC (encoded by the tdcC gene) (see, e.g., Ogawa et al. (1998)  J. Bacteriol.  180: 6749-52; Ogawa et al. (1997)  J. Biochem.  122(6): 1241-5). 
     In one embodiment, the at least one gene encoding a serine transporter is the sdaC gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous sdaC gene. In one embodiment, the at least one gene encoding a serine transporter is the  Escherichia coli  sdaC gene. In one embodiment, the at least one gene encoding a serine transporter is the  Campylobacter jejuni  sdaC gene. 
     In one embodiment, the sdaC gene has at least about 80% identity with the sequence of SEQ ID NO:35. Accordingly, in one embodiment, the sdaC gene has at least about 90% identity with the sequence of SEQ ID NO:35. Accordingly, in one embodiment, the sdaC gene has at least about 95% identity with the sequence of SEQ ID NO:35. Accordingly, in one embodiment, the sdaC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:35. In another embodiment, the sdaC gene comprises the sequence of SEQ ID NO:35. In yet another embodiment the sdaC gene consists of the sequence of SEQ ID NO:35. 
     In one embodiment, the at least one gene encoding a serine transporter is the sstT gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous sstT gene. In one embodiment, the at least one gene encoding a serine transporter is the  Escherichia coli  sstT gene. 
     In one embodiment, the at least one gene encoding a serine transporter is the tdcC gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous tdcC gene. In one embodiment, the at least one gene encoding a serine transporter is the  Escherichia coli  tdcC gene. 
     In some embodiments, the serine transporter is encoded by a serine transporter gene derived from a bacterial genus or species, including but not limited to,  Campylobacter, Campylobacter jejuni, Escherichia , and  Escherichia coli  In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a serine transporter, a functional variant of a serine transporter, or a functional fragment of transporter of serine are well known to one of ordinary skill in the art. For example, import of serine may be determined using the methods as described in Hama et al. (1987)  Biochim. Biophys. Acta  905: 231-9, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the transporter of a serine is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more serine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the serine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more serine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the serine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more serine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the serine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more serine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     6. Glutamine Transporters 
     In one embodiment, the amino acid transporter is a glutamine transporter. Glutamine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance glutamine transport into the cell. Specifically, when the glutamine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more glutamine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a glutamine transporter which may be used to import glutamine into the bacteria. 
     The uptake of glutamine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, a glutamine permease glnHPQ operon has been identified in  Escherichia coli  (Nohno et al.,  Mol. Gen. Genet.  205(2):260-269, 1986). 
     In one embodiment, the at least one gene encoding a glutamine transporter is the glnHPQ operon. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous gene from the glnHPQ operon. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous glnH gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous glnP gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous glnQ gene. 
     In one embodiment, the glnHPQ operon has at least about 80% identity with the sequence of SEQ ID NO:41. Accordingly, in one embodiment, the glnHPQ operon has at least about 90% identity with the sequence of SEQ ID NO:41. Accordingly, in one embodiment, the glnHPQ operon has at least about 95% identity with the sequence of SEQ ID NO:41. Accordingly, in one embodiment, the glnHPQ operon has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:41. In another embodiment, the glnHPQ operon comprises the sequence of SEQ ID NO:41. In yet another embodiment the glnHPQ operon consists of the sequence of SEQ ID NO:41. 
     In one embodiment, the glnH gene has at least about 80% identity with the sequence of SEQ ID NO:42. Accordingly, in one embodiment, the glnH gene has at least about 90% identity with the sequence of SEQ ID NO:42. Accordingly, in one embodiment, the glnH gene has at least about 95% identity with the sequence of SEQ ID NO:42. Accordingly, in one embodiment, the glnH gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:42. In another embodiment, the glnH gene comprises the sequence of SEQ ID NO:42. In yet another embodiment the glnH gene consists of the sequence of SEQ ID NO:42. 
     In one embodiment, the glnP gene has at least about 80% identity with the sequence of SEQ ID NO:43. Accordingly, in one embodiment, the glnP gene has at least about 90% identity with the sequence of SEQ ID NO:43. Accordingly, in one embodiment, the glnP gene has at least about 95% identity with the sequence of SEQ ID NO:43. Accordingly, in one embodiment, the glnP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:43. In another embodiment, the glnP gene comprises the sequence of SEQ ID NO:43. In yet another embodiment the glnP gene consists of the sequence of SEQ ID NO:43. 
     In one embodiment, the glnQ gene has at least about 80% identity with the sequence of SEQ ID NO:44. Accordingly, in one embodiment, the glnQ gene has at least about 90% identity with the sequence of SEQ ID NO:44. Accordingly, in one embodiment, the glnQ gene has at least about 95% identity with the sequence of SEQ ID NO:44. Accordingly, in one embodiment, the glnQ gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:44. In another embodiment, the glnQ gene comprises the sequence of SEQ ID NO:44. In yet another embodiment the glnQ gene consists of the sequence of SEQ ID NO:44. 
     In some embodiments, the glutamine transporter is encoded by a glutamine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a glutamine transporter, a functional variant of a glutamine transporter, or a functional fragment of transporter of glutamine are well known to one of ordinary skill in the art. For example, import of glutamine may be determined using the methods as described in Nohno et al.,  Mol. Gen. Genet.,  205(2):260-269, 1986, the entire contents of which are expressly incorporated by reference herein. 
     In one embodiment, when the glutamine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more glutamine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the glutamine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more glutamine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the glutamine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more glutamine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the glutamine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more glutamine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     7. Tryptophan Transporters 
     In one embodiment, the amino acid transporter is a tryptophan transporter. Tryptophan transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance tryptophan transport into the cell. Specifically, when the tryptophan transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more tryptophan into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a tryptophan transporter which may be used to import tryptophan into the bacteria. 
     The uptake of tryptophan into bacterial cells is mediated by proteins well known to those of skill in the art. For example, three different tryptophan transporters, distinguishable on the basis of their affinity for tryptophan have been identified in  E. coli  (see, e.g., Yanofsky et al. (1991)  J. Bacteriol.  173: 6009-17). The bacterial genes mtr, aroP, and tnaB encode tryptophan permeases responsible for tryptophan uptake in bacteria. High affinity permease, Mtr, is negatively regulated by the trp repressor and positively regulated by the TyR product (see, e.g., Yanofsky et al. (1991)  J. Bacteriol.  173: 6009-17 and Heatwole et al. (1991)  J. Bacteriol.  173: 3601-04), while AroP is negatively regulated by the tyR product (Chye et al. (1987)  J. Bacteriol.  169:386-93). 
     In one embodiment, the at least one gene encoding a tryptophan transporter is a gene selected from the group consisting of mtr, aroP and tnaB. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous gene selected from the group consisting of mtr, aroP and tnaB. In one embodiment, the at least one gene encoding a tryptophan transporter is the  Escherichia coli  mtr gene. In one embodiment, the at least one gene encoding a tryptophan transporter is the  Escherichia coli  aroP gene. In one embodiment, the at least one gene encoding a tryptophan transporter is the  Escherichia coli  tnaB gene. 
     In one embodiment, the mtr gene has at least about 80% identity with the sequence of SEQ ID NO:46. Accordingly, in one embodiment, the mtr gene has at least about 90% identity with the sequence of SEQ ID NO:46. Accordingly, in one embodiment, the mtr gene has at least about 95% identity with the sequence of SEQ ID NO:46. Accordingly, in one embodiment, the mtr gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:46. In another embodiment, the mtr gene comprises the sequence of SEQ ID NO:46. In yet another embodiment the mtr gene consists of the sequence of SEQ ID NO:46. 
     In one embodiment, the tnaB gene has at least about 80% identity with the sequence of SEQ ID NO:47. Accordingly, in one embodiment, the tnaB gene has at least about 90% identity with the sequence of SEQ ID NO:47. Accordingly, in one embodiment, the tnaB gene has at least about 95% identity with the sequence of SEQ ID NO:47. Accordingly, in one embodiment, the tnaB gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:47. In another embodiment, the tnaB gene comprises the sequence of SEQ ID NO:47. In yet another embodiment the tnaB gene consists of the sequence of SEQ ID NO:47. 
     In one embodiment, the aroP gene has at least about 80% identity with the sequence of SEQ ID NO:48. Accordingly, in one embodiment, the aroP gene has at least about 90% identity with the sequence of SEQ ID NO:48. Accordingly, in one embodiment, the aroP gene has at least about 95% identity with the sequence of SEQ ID NO:48. Accordingly, in one embodiment, the aroP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:48. In another embodiment, the aroP gene comprises the sequence of SEQ ID NO:48. In yet another embodiment the aroP gene consists of the sequence of SEQ ID NO:48. 
     In some embodiments, the tryptophan transporter is encoded by a tryptophan transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Corynebacterium, Escherichia coli, Saccharomyces cerevisiae  or  Corynebacterium glutamicum . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a tryptophan transporter, a functional variant of a tryptophan transporter, or a functional fragment of transporter of tryptophan are well known to one of ordinary skill in the art. For example, import of tryptophan may be determined using the methods as described in Shang et al. (2013)  J. Bacteriol.  195:5334-42, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the tryptophan transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more tryptophan into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the tryptophan transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more tryptophan into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the tryptophan transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more tryptophan into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the tryptophan transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more tryptophan into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     8. Methionine Transporters 
     In one embodiment, the amino acid transporter is a methionine transporter. Methionine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance methionine transport into the cell. Specifically, when the methionine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more methionine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a methionine transporter which may be used to import methionine into the bacteria. 
     The uptake of methionine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, a methionine transporter operon has been identified in  Corynebacterium glutamicum  (Trotschel et al.,  J. Bacteriology,  187(11):3786-3794, 2005). In addition, the high affinity MetD ABC transporter system has been characterized in  Escherichia coli  (Kadaba et al. (2008) Science 5886: 250-253; Kadner and Watson (1974)  J. Bacteriol.  119: 401-9). The MetD transporter system is capable of mediating the translocation of several substrates across the bacterial membrane, including methionine. The metD system of  Escherichia coli  consists of MetN (encoded by metN), which comprises the ATPase domain, MetI (encoded by met), which comprises the transmembrane domain, and MetQ (encoded by metQ), the cognate binding protein which is located in the periplasm. Orthologues of the genes encoding the  E. coli  metD transporter system have been identified in multiple organisms including, e.g.,  Yersinia pestis, Vibrio cholerae, Pasteurella multocida, Haemophilus influenza, Agrobacterium tumefaciens, Sinorhizobium meliloti, Brucella meliloti , and  Mesorhizobium loti  (Merlin et al. (2002)  J. Bacteriol.  184: 5513-7). 
     In one embodiment, the at least one gene encoding a methionine transporter is a metP gene, a metN gene, a met gene, or a metQ gene from  Corynebacterium glutamicum, Escherichia coli , and  Bacillus subtilis  (Trotschel et al.,  J. Bacteriology,  187(11):3786-3794, 2005). 
     In one embodiment, the metP gene has at least about 80% identity with the sequence of SEQ ID NO:59. Accordingly, in one embodiment, the metP gene has at least about 90% identity with the sequence of SEQ ID NO:59. Accordingly, in one embodiment, the metP gene has at least about 95% identity with the sequence of SEQ ID NO:59. Accordingly, in one embodiment, the metP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:59. In another embodiment, the metP gene comprises the sequence of SEQ ID NO:59. In yet another embodiment the metP gene consists of the sequence of SEQ ID NO:59. 
     In one embodiment, the metN gene has at least about 80% identity with the sequence of SEQ ID NO:60. Accordingly, in one embodiment, the metN gene has at least about 90% identity with the sequence of SEQ ID NO:60. Accordingly, in one embodiment, the metN gene has at least about 95% identity with the sequence of SEQ ID NO:60. Accordingly, in one embodiment, the metN gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:60. In another embodiment, the metN gene comprises the sequence of SEQ ID NO:60. In yet another embodiment the metN gene consists of the sequence of SEQ ID NO:60. 
     In one embodiment, the metI gene has at least about 80% identity with the sequence of SEQ ID NO:61. Accordingly, in one embodiment, the metI gene has at least about 90% identity with the sequence of SEQ ID NO:61. Accordingly, in one embodiment, the metI gene has at least about 95% identity with the sequence of SEQ ID NO:61. Accordingly, in one embodiment, the metI gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:61. In another embodiment, the metI gene comprises the sequence of SEQ ID NO:61. In yet another embodiment the metI gene consists of the sequence of SEQ ID NO:61. 
     In one embodiment, the metQ gene has at least about 80% identity with the sequence of SEQ ID NO:62. Accordingly, in one embodiment, the metQ gene has at least about 90% identity with the sequence of SEQ ID NO:62. Accordingly, in one embodiment, the metQ gene has at least about 95% identity with the sequence of SEQ ID NO:62. Accordingly, in one embodiment, the metQ gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:62. In another embodiment, the metQ gene comprises the sequence of SEQ ID NO:62. In yet another embodiment the metQ gene consists of the sequence of SEQ ID NO:62. 
     In some embodiments, the methionine transporter is encoded by a methionine transporter gene derived from a bacterial genus or species, including but not limited to,  Corynebacterium glutamicum, Escherichia coli , and  Bacillus subtilis . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a methionine transporter, a functional variant of a methionine transporter, or a functional fragment of a methionine transporter are well known to one of ordinary skill in the art. For example, import of methionine may be determined using the methods as described in Trotschel et al.,  J. Bacteriology,  187(11):3786-3794, 2005, the entire contents of which are expressly incorporated by reference herein. 
     In one embodiment, when the methionine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more methionine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the methionine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more methionine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the methionine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more methionine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the methionine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more methionine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     9. Threonine Transporters 
     In one embodiment, the amino acid transporter is a threonine transporter. Threonine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance threonine transport into the cell. Specifically, when the threonine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more threonine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a threonine transporter which may be used to import threonine into the bacteria. 
     The uptake of threonine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, the threonine transporter TdcC has been identified (Wook Lee et al.,  Nature Chemical Biology,  8:536-546, 2012). Additional serine/threonine transporters have been identified and are disclosed in the serine section herein. 
     In one embodiment, the at least one gene encoding a threonine transporter is the tdcC gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous tdcC gene. In one embodiment, the at least one gene encoding a threonine transporter is the  Escherichia coli  tdcC gene. In one embodiment, the at least one gene encoding a threonine transporter is the  Salmonella typhimurium  tdcC gene. 
     In one embodiment, the tdcC gene has at least about 80% identity with the sequence of SEQ ID NO:69. Accordingly, in one embodiment, the tdcC gene has at least about 90% identity with the sequence of SEQ ID NO:69. Accordingly, in one embodiment, the tdcC gene has at least about 95% identity with the sequence of SEQ ID NO:69. Accordingly, in one embodiment, the tdcC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:69. In another embodiment, the tdcC gene comprises the sequence of SEQ ID NO:69. In yet another embodiment the tdcC gene consists of the sequence of SEQ ID NO:69. 
     In some embodiments, the threonine transporter is encoded by a threonine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia coli  or  Salmonella typhimurium . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a threonine transporter, a functional variant of a threonine transporter, or a functional fragment of transporter of threonine are well known to one of ordinary skill in the art. For example, import of threonine may be determined using the methods as described in Wook Lee et al. (2012) Nature Chemical Biology,  8:536-546, the entire contents of which are expressly incorporated by reference herein. 
     In one embodiment, when the threonine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more threonine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the threonine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more threonine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the threonine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more threonine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the threonine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more threonine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     10. Cysteine Transporters 
     In one embodiment, the amino acid transporter is a cysteine transporter. Cysteine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance cysteine transport into the cell. Specifically, when the cysteine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more cysteine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a cysteine transporter which may be used to import cysteine into the bacteria so that any gene encoding a cysteine catabolism enzyme expressed in the organism can catabolize the cysteine to treat a disease associated with cysteine, such as cancer. 
     The uptake of cysteine into bacterial cells is mediated by proteins well known to those of skill in the art. 
     In some embodiments, the cysteine transporter is encoded by a cysteine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a cysteine transporter, a functional variant of a cysteine transporter, or a functional fragment of transporter of cysteine are well known to one of ordinary skill in the art. 
     In one embodiment, when the transporter of a cysteine is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more cysteine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the cysteine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more cysteine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the cysteine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more cysteine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the cysteine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more cysteine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     11. Tyrosine Transporters 
     In one embodiment, the amino acid transporter is a tyrosine transporter. Tyrosine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance tyrosine transport into the cell. Specifically, when the tyrosine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more tyrosine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a tyrosine transporter which may be used to import tyrosine into the bacteria. 
     The uptake of tyrosine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, a tyrosine transporter TyrP has been identified in  Lactobacillus brevis  (Wolken et al.,  J. Bacteriol.,  188(6): 2198-2206, 2006) and  Escherichia coli.    
     In one embodiment, the at least one gene encoding a tyrosine transporter is the tyrP gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous tyrP gene. In one embodiment, the at least one gene encoding a tyrosine transporter is the  Escherichia  col tyrP gene. In one embodiment, the at least one gene encoding a tyrosine transporter is the  Lactobacillus brevi  tyrP gene. 
     In one embodiment, the tyrP gene has at least about 80% identity with the sequence of SEQ ID NO:87. Accordingly, in one embodiment, the tyrP gene has at least about 90% identity with the sequence of SEQ ID NO:87. Accordingly, in one embodiment, the tyrP gene has at least about 95% identity with the sequence of SEQ ID NO:87. Accordingly, in one embodiment, the tyrP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:87. In another embodiment, the tyrP gene comprises the sequence of SEQ ID NO:87. In yet another embodiment the tyrP gene consists of the sequence of SEQ ID NO:87. 
     In some embodiments, the tyrosine transporter is encoded by a tyrosine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia coli  or  Lactobacillus brevis . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a tyrosine transporter, a functional variant of a tyrosine transporter, or a functional fragment of a tyrosine transporter are well known to one of ordinary skill in the art. For example, import of tyrosine may be determined using the methods as described in Wolken et al.,  J. Bacteriol.,  188(6):2198-2206, 2006, the entire contents of which are expressly incorporated by reference herein. In one embodiment, when the tyrosine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more tyrosine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the tyrosine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more tyrosine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the tyrosine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more tyrosine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the tyrosine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more tyrosine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     12. Phenylalanine Transporters 
     In one embodiment, the amino acid transporter is a phenylalanine transporter. Phenylalanine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance phenylalanine transport into the cell. Specifically, when the phenylalanine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more phenylalanine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a phenylalanine transporter which may be used to import phenylalanine into the bacteria. 
     The uptake of phenylalanine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, a phenylalanine transporter PheP has been identified (Pi et al. (1991)  J. Bacteriol.  173(12): 3622-9; Pi et al. (1996)  J. Bacteriol.  178(9): 2650-5; Pi et al. (1998)  J. Bacteriol.  180(21): 5515-9; and Horsburgh et al. (2004)  Infect. Immun.  72(5): 3073-3076). Additional phenylalanine transporters have been identified and are known in the art. 
     In one embodiment, the at least one gene encoding a phenylalanine transporter is the pheP gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous pheP gene. In one embodiment, the at least one gene encoding a phenylalanine transporter is the  Escherichia coli  pheP gene. In one embodiment, the at least one gene encoding a phenylalanine transporter is the  Staphylococcus aureus  pheP gene. “Phenylalanine transporter” is used to refer to a membrane transport protein that is capable of transporting phenylalanine into bacterial cells (see, e.g., Pi et al., 1991). In  Escherichia coli , the pheP gene encodes a high affinity phenylalanine-specific permease responsible for phenylalanine transport (Pi et al., 1998). In some embodiments, the phenylalanine transporter is encoded by a pheP gene derived from a bacterial species, including but not limited to,  Acinetobacter calcoaceticus, Salmonella enterica , and  Escherichia coli . Other phenylalanine transporters include Aageneral amino acid permease, encoded by the aroP gene, transports three aromatic amino acids, including phenylalanine, with high affinity, and is thought, together with PheP, responsible for the lion share of phenylalanine import. Additionally, a low level of phenylalanine transport activity has been traced to the activity of the LIV-I/LS system, which is a branched-chain amino acid transporter consisting of two periplasmic binding proteins, the LIV-binding protein (LIV-1 system) and LS-binding protein (LS system), and membrane components, LivHMGF. In some embodiments, the phenylalanine transporter is encoded by a aroP gene derived from a bacterial species. In some embodiments, the phenylalanine transporter is encoded by LIV-binding protein and LS-binding protein and LivHMGF genes derived from a bacterial species. In some embodiments, the genetically engineered bacteria comprise more than one type of phenylalanine transporter, selected from pheP, aroP, and the LIV-I/LS system. 
     In one embodiment, the pheP gene has at least about 80% identity with the sequence of SEQ ID NO:98. Accordingly, in one embodiment, the pheP gene has at least about 90% identity with the sequence of SEQ ID NO:98. Accordingly, in one embodiment, the pheP gene has at least about 95% identity with the sequence of SEQ ID NO:98. Accordingly, in one embodiment, the pheP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:98. In another embodiment, the pheP gene comprises the sequence of SEQ ID NO:98. In yet another embodiment the pheP gene consists of the sequence of SEQ ID NO:98. 
     In some embodiments, the phenylalanine transporter is encoded by a phenylalanine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia coli  or  Staphylococcus aureus . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a phenylalanine transporter, a functional variant of a phenylalanine transporter, or a functional fragment of a phenylalanine transporter are well known to one of ordinary skill in the art. For example, import of phenylalanine may be determined using the methods as described in Pi et al. (1998)  J. Bacteriol.  180(21): 5515-9, the entire contents of which are expressly incorporated by reference herein. 
     In one embodiment, when the phenylalanine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more phenylalanine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the phenylalanine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more phenylalanine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the phenylalanine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more phenylalanine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the phenylalanine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more phenylalanine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding a phenylalanie transporter may be used to treat a disease, condition, and/or symptom associated with cancer, e.g., a cancer described herein. In some embodiments, the recombinant bacterial cells described herein may be used to reduce, ameliorate, or eliminate one or more symptom(s) associated with a cancer. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding a phenylalanine transporter may be used to treat a disease, condition, and/or symptom associated with hyperphenylalaninemia. In some embodiments, the recombinant bacterial cells described herein may be used to reduce, ameliorate, or eliminate one or more symptom(s) associated with hyperphenylalaninemia. In some embodiments, the disease is selected from the group consisting of phenylketonuria, classical or typical phenylketonuria, atypical phenylketonuria, permanent mild hyperphenylalaninemia, nonphenylketonuric hyperphenylalaninemia, phenylalanine hydroxylase deficiency, cofactor deficiency, dihydropteridine reductase deficiency, tetrahydropterin synthase deficiency, and Segawa&#39;s disease. In some embodiments, hyperphenylalaninemia is secondary to other conditions, e.g., liver diseases. In some embodiments, the invention provides methods for reducing, ameliorating, or eliminating one or more symptom(s) associated with these diseases, including but not limited to neurological deficits, mental retardation, encephalopathy, epilepsy, eczema, reduced growth, microcephaly, tremor, limb spasticity, and/or hypopigmentation. In some embodiments, the subject to be treated is a human patient. 
     It was discovered that PAL1 and PAL3 expressed on a high-copy plasmid and a low-copy plasmid in genetically engineered  E. coli  Nissle metabolized and reduced phenylalanine to similar levels, and the rate-limiting step of phenylalanine metabolism was phenylalanine availability. Thus, in some embodiments for the treatment of PKU, it is advantageous to increase phenylalanine transport into the cell, thereby enhancing phenylalanine metabolism. Unexpectedly, even low-copy PAL plasmids are capable of almost completely eliminating Phe from a test sample when expressed in conjunction with pheP. Furthermore, there may be additional advantages to using a low-copy PAL-expressing plasmid in conjunction with pheP in order to enhance the stability of PAL expression while maintaining high phenylalanine metabolism, and to reduce negative selection pressure on the transformed bacterium. In alternate embodiments, the phenylalanine transporter is used in conjunction with the high-copy plasmid. 
     The genetically engineered bacteria further comprise a gene encoding a phenylalanine transporter. Phenylalanine transporters may be expressed or modified in the genetically engineered bacteria of the invention in order to enhance phenylalanine transport into the cell. 
     PheP is a membrane transport protein that is capable of transporting phenylalanine into bacterial cells (see, e.g., Pi et al., 1991). In some embodiments, the native pheP gene in the genetically modified bacteria of the invention is not modified. In some embodiments, the genetically engineered bacteria of the invention comprise multiple copies of the native pheP gene. In some embodiments, the genetically engineered bacteria of the invention comprise multiple copies of a non-native pheP gene. In some embodiments, the genetically engineered bacteria of the invention comprise a pheP gene that is controlled by its native promoter, an inducible promoter, a promoter that is stronger than the native promoter, e.g., the GlnRS promoter or the P(Bla) promoter, or a constitutive promoter. In some embodiments, expression of the pheP gene is controlled by a different promoter than the promoter that controls expression of the gene encoding the phenylalanine-metabolizing enzyme and/or the transcriptional regulator. In some embodiments, expression of the pheP gene is controlled by the same promoter that controls expression of the phenylalanine-metabolizing enzyme and/or the transcriptional regulator. In some embodiments, the pheP gene and the phenylalanine-metabolizing enzyme and/or the transcriptional regulator are divergently transcribed from a promoter region. In some embodiments, expression of each of the genes encoding PheP, the phenylalanine-metabolizing enzyme, and the transcriptional regulator is controlled by a different promoter. In some embodiments, expression of the genes encoding PheP, the phenylalanine-metabolizing enzyme, and the transcriptional regulator is controlled by the same promoter. 
     In some embodiments, the native pheP gene in the genetically modified bacteria is not modified, and one or more additional copies of the native pheP gene are inserted into the genome under the control of the same inducible promoter that controls expression of PAL, e.g., the FNR promoter, or a different inducible promoter than the one that controls expression of PAL, or a constitutive promoter. In alternate embodiments, the native pheP gene is not modified, and a copy of a non-native pheP gene from a different bacterial species is inserted into the genome under the control of the same inducible promoter that controls expression of PAL, e.g., the FNR promoter, or a different inducible promoter than the one that controls expression of PAL, or a constitutive promoter. 
     In some embodiments, the native pheP gene in the genetically modified bacteria is not modified, and one or more additional copies of the native pheP gene are present in the bacteria on a plasmid and under the control of the same inducible promoter that controls expression of PAL, e.g., the FNR promoter, or a different inducible promoter than the one that controls expression of the PME, or a constitutive promoter. In alternate embodiments, the native pheP gene is not modified, and a copy of a non-native pheP gene from a different bacterial species is present in the bacteria on a plasmid and under the control of the same inducible promoter that controls expression of PAL, e.g., the FNR promoter, or a different inducible promoter than the one that controls expression of PAL, or a constitutive promoter. 
     In some embodiments, the native pheP gene is mutagenized, mutants exhibiting increased phenylalanine transport are selected, and the mutagenized pheP gene is isolated and inserted into the genetically engineered bacteria (see, e.g., Pi et al., 1996; Pi et al., 1998). The phenylalanine transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the genetically engineered bacterium is  E. coli  Nissle, and the native pheP gene in  E. coli  Nissle is not modified; one or more additional copies the native  E. coli  Nissle pheP genes are inserted into the  E. coli  Nissle genome under the control of the same inducible promoter that controls expression of PAL, e.g., the FNR promoter, or a different inducible promoter than the one that controls expression of PAL, or a constitutive promoter. In an alternate embodiment, the native pheP gene in  E. coli  Nissle is not modified, and a copy of a non-native pheP gene from a different bacterium is inserted into the  E. coli  Nissle genome under the control of the same inducible promoter that controls expression of PAL, e.g., the FNR promoter, or a different inducible promoter than the one that controls expression of PAL, or a constitutive promoter. In some embodiments, the genetically engineered bacterium is  E. coli  Nissle, and the native pheP gene in  E. coli  Nissle is not modified; one or more additional copies the native  E. coli  Nissle pheP genes are present in the bacterium on a plasmid and under the control of the same inducible promoter that controls expression of PAL, e.g., the FNR promoter, or a different inducible promoter than the one that controls expression of PAL, or a constitutive promoter. In an alternate embodiment, the native pheP gene in  E. coli  Nissle is not modified, and a copy of a non-native pheP gene from a different bacterium, are present in the bacterium on a plasmid and under the control of the same inducible promoter that controls expression of PAL, e.g., the FNR promoter, or a different inducible promoter than the one that controls expression of PAL, or a constitutive promoter. 
     It has been reported that  Escherichia coli  has five distinct transport systems (AroP, Mtr, PheP, TnaB, and TyrP) for the accumulation of aromatic amino acids. A general amino acid permease, encoded by the aroP gene, transports three aromatic amino acids, including phenylalanine, with high affinity, and is thought, together with PheP, responsible for the lion share of phenylalanine import. Additionally, a low level of accumulation of phenylalanine was observed in an aromatic amino acid transporter-deficient  E. coli  strain (ΔaroP ΔpheP Δmtr Δtna ΔtyrP), and was traced to the activity of the LIV-I/LS system, which is a branched-chain amino acid transporter consisting of two periplasmic binding proteins, the LIV-binding protein (LIV-I system) and LS-binding protein (LS system), and membrane components, LivHMGF (Koyanagi et al., and references therein; Identification of the LIV-I/LS System as the Third Phenylalanine Transporter in  Escherichia coli  K-12). 
     In some embodiments, the genetically engineered bacteria comprise an aroP gene. In some embodiments, the genetically engineered bacterium is  E. coli  Nissle, and the native aroP gene in  E. coli  Nissle is not modified; one or more additional copies the native  E. coli  Nissle aroP genes are present in the bacterium on a plasmid and under the control of the same inducible promoter that controls expression of the PME, e.g., the FNR promoter, or the araBAD promoter, a different inducible promoter than the one that controls expression of the PME, or a constitutive promoter. In an alternate embodiment, the native aroP gene in  E. coli  Nissle is not modified, and a copy of a non-native aroP gene from a different bacterium, are present in the bacterium on a plasmid and under the control of the same inducible promoter that controls expression of the PME, e.g., the FNR promoter or the AraBAD promoter, or a different inducible promoter than the one that controls expression of the PME, or a constitutive promoter. 
     In other embodiments, the genetically engineered bacteria comprise AroP and PheP, under the control of the same or different inducible or constitutive promoters. 
     In some embodiments, the pheP gene is expressed on a chromosome. In some embodiments, expression from the chromosome may be useful for increasing stability of expression of pheP. In some embodiments, the pheP gene is integrated into the bacterial chromosome at one or more integration sites in the genetically engineered bacteria. In some embodiments, the pheP gene is inserted into the bacterial genome at one or more of the following insertion sites in  E. coli  Nissle: malE/K, insB/I, araC/BAD, lacZ, agal/rsml, thyA, and malP/T. Any suitable insertion site may be used (see, e.g., The insertion site may be anywhere in the genome, e.g., in a gene required for survival and/or growth, such as thyA (to create an auxotroph); in an active area of the genome, such as near the site of genome replication; and/or in between divergent promoters in order to reduce the risk of unintended transcription, such as between AraB and AraC of the arabinose operon. 
     In some embodiments, the genetically engineered bacterium comprises multiple mechanisms of action and/or one or more auxotrophies. In certain embodiments, the bacteria are genetically engineered to comprise five copies of PAL under the control of an oxygen level-dependent promoter (e.g., Pfrs-PAL3) inserted at different integration sites on the chromosome (e.g., malE/K, yicS/nep, malP/T, agaI/rsmI, and cea), and one copy of a phenylalanine transporter gene under the control of an oxygen level-dependent promoter (e.g., P fnrS -pheP) inserted at a different integration site on the chromosome (e.g., lacZ). In a more specific aspect, the bacteria are genetically engineered to further include a kanamycin resistance gene, and a thyA auxotrophy, in which the thyA gene is deleted and/or replaced with an unrelated gene. 
     13. Glutamic Acid Transporters 
     In one embodiment, the amino acid transporter is a glutamic transporter. Glutamic acid transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance glutamic acid transport into the cell. Specifically, when the glutamic acid transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more glutamic acid into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a glutamic acid transporter which may be used to import glutamic acid into the bacteria. 
     The uptake of glutamic acid into bacterial cells is mediated by proteins well known to those of skill in the art. For example, a Na + -coupled symporter GltT for glutamic acid uptake has been identified in  Bacillus subtilis  (see, e.g., Zaprasis et al. (2015)  App. Env. Microbiol.  81:250-9). The bacterial gene gltT encodes a glutamic acid transporter responsible for glutamic acid uptake in many bacteria (see, e.g., Jan Slotboom et al. (1999)  Microb. Mol. Biol. Rev.  63:293-307; Takahashi et al. (2015)  Inf. Imm.  83:3555-67; Ryan et al. (2007)  Nat. Struct. Mol. Biol.  14:365-71; and Tolner et al. (1992)  Mol. Microbiol.  6:2845-56). 
     In one embodiment, the at least one gene encoding a glutamic acid transporter is the gltT gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous gltT gene. In one embodiment, the at least one gene encoding a glutamic acid transporter is the  Escherichia coli  gltP gene. In one embodiment, the at least one gene encoding a glutamic acid transporter is the  Bacillus subtilis  gltT gene. In one embodiment, the at least one gene encoding a glutamic acid transporter is the  Mycobacterium tuberculosis  dctA gene. In one embodiment, the at least one gene encoding a glutamic acid transporter is the  Salmonella typhimurium  dctA gene. In one embodiment, the at least one gene encoding a glutamic acid transporter is the  Caenorhabditis elegans  gltT gene. 
     In one embodiment, the gltT gene has at least about 80% identity with the sequence of SEQ ID NO:91. Accordingly, in one embodiment, the gltT gene has at least about 90% identity with the sequence of SEQ ID NO:91. Accordingly, in one embodiment, the gltT gene has at least about 95% identity with the sequence of SEQ ID NO:91. Accordingly, in one embodiment, the gltT gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:91. In another embodiment, the gltT gene comprises the sequence of SEQ ID NO:91. In yet another embodiment the gltT gene consists of the sequence of SEQ ID NO:91. 
     In some embodiments, the glutamic acid transporter is encoded by a glutamic acid transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Bacillus, Chlamydia, Mycobacterium, Salmonella, Escherichia coli, Mycobacterium tuberculosis, Salmonella typhimurium , or  Caenorhabditis elegans  (see, e.g., Jan Slotboom et al. (1999) Microbiol. Mol. Biol. Rev. 63:293-307) In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a glutamic acid transporter, a functional variant of a glutamic acid transporter, or a functional fragment of transporter of glutamic acid are well known to one of ordinary skill in the art. For example, import of glutamic acid may be determined using the methods as described in Zaprasis et al. (2015)  App. Env. Microbiol.  81:250-9, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the glutamic acid transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more glutamic acid into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the glutamic acid transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more glutamic acid into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the glutamic acid transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more glutamic acid into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the glutamic acid transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more glutamic acid into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     14. Histidine Transporters 
     In one embodiment, the amino acid transporter is a histidine transporter. Histidine transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance histidine transport into the cell. Specifically, when the histidine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more histidine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a histidine transporter which may be used to import histidine into the bacteria. 
     The uptake of histidine into bacterial cells is mediated by proteins well known to those of skill in the art. For example, a histidine transport system is encoded by the hisJQMP operon and the artJgene (see, e.g., Caldara et al. (2007)  J. Mol. Biol.  373(2): 251-67). Transport by the histidine transport system is mediated by several proteins regulated by the ArgR-L-arginine DNA-binding transcriptional dual regulator. ArgR complexed with L-arginine represses the transcription of several genes involved in transport of histidine. In this system, HisJ (encoded by hisJ) is a histidine ABC transporter-periplasmic binding protein, HisQ and HisM (encoded by hisQ and hisM respectively) are the lysine/arginine/ornithine ABC transporter/histidine ABC transporter-membrane subunits, HisP (encoded by hisP) is a lysine/arginine/ornithine ABC transporter/histidine ABC transporter-ATP binding subunit. This system has been well characterized in  Escherichia coli . In addition, bacterial systems that are homologous and orthologous to the  E. coli  histidine-specific system have been characterized in other bacterial species, including, for example,  Pseudomonas fluorescens  (see, e.g., Bender (2012) Microbiol. Mol. Biol. Reviews 76: 565-584). The membranous and membrane-associated proteins of the histidine permease (Q M P complex), encoded by the hisJQMP operon mediate the uptake of histidine (see, e.g., Oh et al. (1994)  J. Biol. Chem.  269(42): 26323-30). 
     In one embodiment, the at least one gene encoding a histidine transporter comprises the hisJQMP operon. In one embodiment, the at least one gene encoding a histidine transporter comprises the hisJgene. In one embodiment, the at least one gene encoding a histidine transporter comprises the hisQ gene. In one embodiment, the at least one gene encoding a histidine transporter comprises the hisM gene. In one embodiment, the at least one gene encoding a histidine transporter comprises the hisP gene. 
     In one embodiment, the hisJgene has at least about 80% identity with the sequence of SEQ ID NO:94. Accordingly, in one embodiment, the hisJgene has at least about 90% identity with the sequence of SEQ ID NO:94. Accordingly, in one embodiment, the hisJ gene has at least about 95% identity with the sequence of SEQ ID NO:94. Accordingly, in one embodiment, the hisJ gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:94. In another embodiment, the hisJgene comprises the sequence of SEQ ID NO:94. In yet another embodiment, the hisJgene consists of the sequence of SEQ ID NO:94. 
     In one embodiment, the hisQ gene has at least about 80% identity with the sequence of SEQ ID NO:95. Accordingly, in one embodiment, the hisQ gene has at least about 90% identity with the sequence of SEQ ID NO:95. Accordingly, in one embodiment, the hisQ gene has at least about 95% identity with the sequence of SEQ ID NO:95. Accordingly, in one embodiment, the hisQ gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:95. In another embodiment, the hisQ gene comprises the sequence of SEQ ID NO:95. In yet another embodiment, the hisQ gene consists of the sequence of SEQ ID NO:95. 
     In one embodiment, the hisM gene has at least about 80% identity with the sequence of SEQ ID NO:103. Accordingly, in one embodiment, the hisM gene has at least about 90% identity with the sequence of SEQ ID NO:103. Accordingly, in one embodiment, the hisM gene has at least about 95% identity with the sequence of SEQ ID NO:103. Accordingly, in one embodiment, the hisM gene n has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:103. In another embodiment, the hisM gene comprises the sequence of SEQ ID NO:103. In yet another embodiment, the hisM gene consists of the sequence of SEQ ID NO:103. 
     In one embodiment, the hisP gene has at least about 80% identity with the sequence of SEQ ID NO:96. Accordingly, in one embodiment, the hisP gene has at least about 90% identity with the sequence of SEQ ID NO:96. Accordingly, in one embodiment, the hisP gene has at least about 95% identity with the sequence of SEQ ID NO:96. Accordingly, in one embodiment, the hisP gene nhas at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:96. In another embodiment, the hisP gene comprises the sequence of SEQ ID NO:96. In yet another embodiment, the hisP gene consists of the sequence of SEQ ID NO:96. 
     In some embodiments, the histidine transporter is encoded by a histidine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia  and  Pseudomonas  In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a histidine transporter, a functional variant of a histidine transporter, or a functional fragment of a histidine transporter are well known to one of ordinary skill in the art. For example, import of histidine may be determined using the methods described in Liu et al. (1997)  J. Biol. Chem.  272: 859-866 and Shang et al. (2013)  J. Bacteriology.  195(23): 5334-5342, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the histidine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more histidine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the histidine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more histidine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the histidine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more histidine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the histidine transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more histidine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     15. Proline Transporters 
     In one embodiment, the amino acid transporter is a proline transporter. Proline transporters may be expressed or modified in the recombinant bacteria described herein in order to enhance proline transport into the cell. Specifically, when the proline transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import more proline into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding a proline transporter which may be used to import proline into the bacteria. 
     The uptake of proline into bacterial cells is mediated by proteins well known to those of skill in the art. The proline utilization operon (put) allows bacterial cells to transport and use proline. The put operon consists of two genes putA and putP. In bacteria, there are two distinct systems for proline uptake, proline porter I (PPI) and proline porter II(PPII) (see, e.g., Grothe (1986)  J. Bacteriol.  166: 253-259). The bacterial gene putP encodes a proline transporter responsible for proline uptake in many bacteria (see, e.g., Ostrovsky et al. (1993) Proc. Natl. Acad. Sci. 90: 429-8; Grothe (1986)  J. Bacteriol.  166: 253-259). The putA gene expresses a polypeptide that has proline dehydrogenase (EC 1.5.99.8) activity and pyrroline-5-carboxylate (P5C) (EC 1.5.1.12) activity (see, e.g., Menzel and Roth (1981)  J. Biol. Chem.  256:9755-61). In the absence of proline, putA remains in the cytoplasm and represses put gene expression. In the presence of proline, putA binds to the membrane relieving put repression allowing put gene expression (see, e.g., Ostrovsky et al. (1993)  Proc. Natl. Acad. Sci.  90: 429-8). 
     In one embodiment, the at least one gene encoding a proline transporter is the putP gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous putP gene. In one embodiment, the at least one gene encoding a proline transporter is the  Escherichia coli  putP gene. In one embodiment, the at least one gene encoding a proline transporter is the  Salmonella typhimurium  putP gene. In one embodiment, the at least one gene encoding a proline transporter is the  Escherichia coli  putP gene. 
     In one embodiment, the putP gene has at least about 80% identity with the sequence of SEQ ID NO:98. Accordingly, in one embodiment, the putP gene has at least about 90% identity with the sequence of SEQ ID NO:98. Accordingly, in one embodiment, the putP gene has at least about 95% identity with the sequence of SEQ ID NO:98. Accordingly, in one embodiment, the putP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:98. In another embodiment, the putP gene comprises the sequence of SEQ ID NO:98. In yet another embodiment the putP gene consists of the sequence of SEQ ID NO:98. 
     In some embodiments, the proline transporter is encoded by a proline transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Salmonella, Escherichia coli  or  Salmonella typhimurium . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a proline transporter, a functional variant of a proline transporter, or a functional fragment of a proline transporter are well known to one of ordinary skill in the art. For example, import of proline may be determined using the methods as described in Moses et al. (2012)  Journal of Bacteriology  194: 745-58 and Hoffman et al. (2012)  App. and Enviro. Microbiol.  78: 5753-62), the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, when the proline transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 10% more proline into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the proline transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more proline into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the proline transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import two-fold more proline into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the proline transporter is expressed in the recombinant bacterial cells described herein, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold, more proline into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     B. Nucleoside Transporters 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a nucleoside transporter. In one embodiment, the nucleoside transporter is a purine nucleoside transporter. In one embodiment, the nucleoside transporter is a pyrimidine nucleoside transporter. In one embodiment, the nucleoside transporter transports at least one nucleoside selected from the group consisting of adenosine, guanosine, uridine, inosine, xanthosine, thymidine and cytidine, into the cell. 
     The uptake of nucleosides into bacterial cells is mediated by proteins well known to those of skill in the art. For example, many bacteria scavenge nucleosides from the environment for the synthesis of nucleotides and deoxynucleotides. In some bacterial species, e.g.,  Escherichia coli , nucleosides can be used as the sole source of nitrogen and carbon for growth (see, e.g., Neuhard and Nygaard “Biosynthesis and conversion of nucleotides, purines and pyrimidines,” in: Neidhardt F C, Ingraham J L, Low K B, Magasanik B, Schaechter M, Umbarger H E, editors.  Escherichia coli  and  Salmonella typhimurium : Cellular and Molecular Biology. Washington D.C.: ASM Press; 1987. pp. 445-473). Two evolutionarily unrelated cation-linked transporter families have been identified: the concentrative nucleoside transporter (CNT) family and the nucleoside:H +  Symporter (NHS) family, both of which are responsible for nucleoside uptake (see, e.g., Cabrita et al. (2002)  Biochem. Cell Biol.  80(5): 623-38, the contents of which is herein incorporated by reference in its entirety). 
     Passive transport of nucleosides across the outer membrane of some Gram-negative bacteria, e.g.,  Salmonella enterica , and into the periplasm can be mediated by the Tsx porin, encoded by the tsx gene (see, e.g., Bucarey et al. (20005)  Infect. Immun.  73(10): 6210-9). 
     Active transport of nucleosides across the inner membrance is mediated by the nucleoside permeases NupC and NupG, encoded by the nupC and nupG genes, respectively. NupG can facilitate the uptake of all tested purine and pyrimidine nucleosides while NupC has specificity towards the pyrimidine nucleosides and their deoxyderivatives. Both permeases are powered by proton motive force.  E. coli  mutants defective in both the nupC and nupG genes cannot grow with nucleosides as their single carbon source. Both permeases are proton-linked but they differ in their selectivity. NupG is capable of transporting a wide range of nucleosides and deoxynucleosides; in contrast, NupC does not transport guanosine or deoxyguanosine. Homologs of NupG from  E. coli  are found in a wide range of bacteria, including human gut pathogens such as  Salmonella typhimurium , organisms associated with periodontal disease such as  Porphyromonas gingivalis  and  Prevotella intermedia , and plant pathogens of the genus  Erwinia  (see, e.g., Vaziri et al. (2013)  Mol. Membr. Biol.  30(1-2): 114-128, the contents of which is herein incorporated by reference in its entirety). 
     An additional nucleoside transporter, the xanthosine permease, XapB, having 58% identity to NupG was identified in  Escherichia coli  Norholm and Dandanell (2001)  J. Bacteriol.  183(16): 4900-4. XapB exhibits similar specificity to NupG, since it appears to be able to transport all nucelosides except guanosine. Putative bacterial transporters from the CNT superfamily and transporters from the NupG/XapB family include those listed in the tables 2 and 3 below. In addition, codB (GenBank P25525,  Escherichia coli ) was identified based on homology to a yeast transporter family termed the uracil/allantoin transportor family (Cabrita et al. (2002)). 
     
       
         
           
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                 Putative CNT family transporters 
               
            
           
           
               
               
               
            
               
                 Name 
                 GenBank Accession No. 
                 Organism 
               
               
                   
               
               
                 BH1446 
                 BAB05165 
                 
                   Bacillus halodurans 
                 
               
               
                 BsNupC 
                 CAA57663 
                 
                   Bacillus subtilis 
                 
               
               
                 BsyutK 
                 CAB15208 
                 
                   B. subtilis 
                 
               
               
                 BsyxjA 
                 CAB15938 
                 
                   B. subtilis 
                 
               
               
                 CcCNT (CC2089) 
                 AAK24060 
                 
                   Caulobacter crescentus 
                 
               
               
                 yeiJ 
                 AAC75222 
                 
                   E. coli 
                 
               
               
                 yeiM 
                 AAC75225 
                 
                   E. coli 
                 
               
               
                 HI0519 
                 AAC22177 
                 
                   Haemophilus influenzae 
                 
               
               
                 HP1180 (NupC) 
                 AAD08224 
                 
                   Helicobacter pylori 
                 
               
               
                 SA0600 (NupC) 
                 BAB41833 
                 
                   Staphylococcus aureus 
                 
               
               
                 SAV0645 (NupC) 
                 BAB56807 
                 
                   S. aureus 
                 
               
               
                 SpNupC 
                 AAK34582 
                 
                   Streptococcus pyogenes 
                 
               
               
                 VC2352 (NupC) 
                 AAF95495 
                 
                   Vibrio cholerae 
                 
               
               
                 VC1953 (NupC) 
                 AAF95101 
                 
                   V. cholera 
                 
               
               
                 VCA0179 
                 AAF96092 
                 
                   V. cholera 
                 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 Bacterial transporters from the NupG/XapB family 
               
            
           
           
               
               
               
            
               
                 Protein (gene name) 
                 GenBank Accession No. 
                 Organism 
               
               
                   
               
               
                 yegT 
                 P76417 
                 
                   Escherichia coli 
                 
               
               
                 NupG 
                 P09452 
                 
                   E. coli 
                 
               
               
                 XapB 
                 P45562 
                 
                   E. coli 
                 
               
               
                 CC1628 
                 AAK23606 
                 
                   Caulobacter crescentus 
                 
               
               
                   
               
            
           
         
       
     
     In one embodiment, the nucleoside transporter is a nucleoside permease (e.g., NupC or NupG). In one embodiment, the nucleoside transporter is a adenosine permease. In one embodiment, the nucleoside transporter is a guanosine permease. In one embodiment, the nucleoside transporter is a uridine permease. In one embodiment, the nucleoside transporter is a inosine permease. In one embodiment, the nucleoside transporter is a xanthosine permease. In one embodiment, the nucleoside transporter is a thymidine permease. In one embodiment, the nucleoside transporter is a cytidine permease. 
     In one embodiment, the nucleoside transporter is a nucleoside porin (e.g., Tsx). In one embodiment, the nucleoside transporter is a sodium-dependent nucleoside transporter. In one embodiment, the nucleoside transporter is a xanthosine transporter (e.g., XapB). 
     Nucleoside transporters may be expressed or modified in the bacteria in order to enhance nucleoside transport into the cell. Specifically, when the nucleoside transporter is expressed in the recombinant bacterial cells, the bacterial cells import more nucleoside(s) into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a nucleoside transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a nucleoside transporter and a genetic modification that reduces export of a nucleoside, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a nucleoside transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a nucleoside transporter. In some embodiments, the at least one native gene encoding a nucleoside transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a nucleoside transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native nucleoside transporter, as well as at least one copy of at least one heterologous gene encoding an nucleoside transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a nucleoside transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a nucleoside transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a nucleoside transporter, wherein said nucleoside transporter comprises a nucleoside sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the nucleoside sequence of a polypeptide encoded by a nucleoside transporter gene disclosed herein. 
     In some embodiments, the nucleoside transporter is encoded by a nucleoside transporter gene derived from a bacterial genus or species, including but not limited to,  Bacillus halodurans, Bacillus subtilis, Caulobacter crescentus, Escherichia coli, Haemoophilus influenzae, Helicobacter pylori, Pseudomonas, Bacillus subtilis, Escherichia coli, Prevotella intermedia, Porphytomonas gingivalis, Salmonella typhimurium, Salmonella enterica , or  Vibrio cholera . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     The present disclosure further comprises genes encoding functional fragments of a nucleoside transporter or functional variants of a nucleoside transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a nucleoside transporter relates to an element having qualitative biological activity in common with the wild-type nucleoside transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated nucleoside transporter is one which retains essentially the same ability to import a nucleoside into the bacterial cell as does the nucleoside transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a nucleoside transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a nucleoside transporter. 
     Assays for testing the activity of a nucleoside transporter, a functional variant of a nucleoside transporter, or a functional fragment of a nucleoside transporter are well known to one of ordinary skill in the art. For example, import of a nucleoside may be determined using, e.g., a  14 C-labeled nucleoside uptake assay as described in Norholm and Dandanell (2001)  J. Bacteriol.  183(16): 4900-4, the entire contents of each of which are expressly incorporated by reference herein. 
     In one embodiment, the genes encoding the nucleoside transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the nucleoside transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a nucleoside transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a nucleoside transporter is mutagenized; mutants exhibiting increased nucleoside import are selected; and the mutagenized at least one gene encoding a nucleoside transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a nucleoside transporter is mutagenized; mutants exhibiting decreased nucleoside import are selected; and the mutagenized at least one gene encoding a nucleoside transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a nucleoside transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a nucleoside transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a nucleoside transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a nucleoside transporter in nature. In some embodiments, the at least one gene encoding the nucleoside transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the nucleoside transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the nucleoside transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the nucleoside transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a nucleoside transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a nucleoside transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a nucleoside transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a nucleoside transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a nucleoside transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a nucleoside transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a nucleoside transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a nucleoside transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the nucleoside transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the nucleoside transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the nucleoside transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the nucleoside transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In one embodiment, the nucleoside transporter is encoded by a tsx gene, e.g., a tsx gene disclosed herein. In one embodiment, the tsx gene has at least about 80% identity with the sequence of SEQ ID NO:107. Accordingly, in one embodiment, the tsx gene has at least about 90% identity with the sequence of SEQ ID NO:107. Accordingly, in one embodiment, the tsx gene has at least about 95% identity with the sequence of SEQ ID NO:107. Accordingly, in one embodiment, the tsx gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:107. In another embodiment, the tsx gene comprises the sequence of SEQ ID NO:107. In yet another embodiment the tsx gene consists of the sequence of SEQ ID NO:107. 
     In one embodiment, the tsx gene has at least about 80% identity with the sequence of SEQ ID NO:108. Accordingly, in one embodiment, the tsx gene has at least about 90% identity with the sequence of SEQ ID NO:108. Accordingly, in one embodiment, the tsx gene has at least about 95% identity with the sequence of SEQ ID NO:108. Accordingly, in one embodiment, the tsx gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:108. In another embodiment, the tsx gene comprises the sequence of SEQ ID NO:108. In yet another embodiment the tsx gene consists of the sequence of SEQ ID NO:108. 
     In one embodiment, the nucleoside transporter is encoded by a BH1446 gene, e.g., a BH1446 gene disclosed herein. In one embodiment, the BH1446 gene has at least about 80% identity with the sequence of SEQ ID NO:109. Accordingly, in one embodiment, the BH1446 gene has at least about 90% identity with the sequence of SEQ ID NO:109. Accordingly, in one embodiment, the BH1446 gene has at least about 95% identity with the sequence of SEQ ID NO:109. Accordingly, in one embodiment, the BH1446 gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:109. In another embodiment, the BH1446 gene comprises the sequence of SEQ ID NO:109. In yet another embodiment the BH1446 gene consists of the sequence of SEQ ID NO:109. 
     In one embodiment, the nucleoside transporter is encoded by a nupC gene, e.g., a nupC gene disclosed herein. In one embodiment, the nupC gene is a nupC gene from  Bacillus subtilis . In one embodiment, the nupC gene has at least about 80% identity with the sequence of SEQ ID NO:110. Accordingly, in one embodiment, the nupC gene has at least about 90% identity with the sequence of SEQ ID NO:110. Accordingly, in one embodiment, the nupC gene has at least about 95% identity with the sequence of SEQ ID NO:110. Accordingly, in one embodiment, the nupC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:110. In another embodiment, the nupC gene comprises the sequence of SEQ ID NO:110. In yet another embodiment the nupC gene consists of the sequence of SEQ ID NO:110. 
     In one embodiment, the nupC gene is a nupC gene from  Helicobacter pylori . In one embodiment, the nupC gene has at least about 80% identity with the sequence of SEQ ID NO:117. Accordingly, in one embodiment, the nupC gene has at least about 90% identity with the sequence of SEQ ID NO:117. Accordingly, in one embodiment, the nupC gene has at least about 95% identity with the sequence of SEQ ID NO:117. Accordingly, in one embodiment, the nupC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:117. In another embodiment, the nupC gene comprises the sequence of SEQ ID NO:117. In yet another embodiment the nupC gene consists of the sequence of SEQ ID NO:117. 
     In one embodiment, the nupC (also referred to herein as SA0600) gene is a nupC gene from  Staphylococcus aureus . In one embodiment, the nupC gene has at least about 80% identity with the sequence of SEQ ID NO:118. Accordingly, in one embodiment, the nupC gene has at least about 90% identity with the sequence of SEQ ID NO:118. Accordingly, in one embodiment, the nupC gene has at least about 95% identity with the sequence of SEQ ID NO:118. Accordingly, in one embodiment, the nupC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:118. In another embodiment, the nupC gene comprises the sequence of SEQ ID NO:118. In yet another embodiment the nupC gene consists of the sequence of SEQ ID NO:118. 
     In one embodiment, the nupC (also referred to herein as SAV0645) gene is a nupC gene from  Staphylococcus aureus . In one embodiment, the nupC gene has at least about 80% identity with the sequence of SEQ ID NO:119. Accordingly, in one embodiment, the nupC gene has at least about 90% identity with the sequence of SEQ ID NO:119. Accordingly, in one embodiment, the nupC gene has at least about 95% identity with the sequence of SEQ ID NO:119. Accordingly, in one embodiment, the nupC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:119. In another embodiment, the nupC gene comprises the sequence of SEQ ID NO:119. In yet another embodiment the nupC gene consists of the sequence of SEQ ID NO:119. 
     In one embodiment, the nupC (also referred to herein as spNupC) gene is a nupC gene from  Streptococcus pyogenes . In one embodiment, the nupC gene has at least about 80% identity with the sequence of SEQ ID NO:120. Accordingly, in one embodiment, the nupC gene has at least about 90% identity with the sequence of SEQ ID NO:120. Accordingly, in one embodiment, the nupC gene has at least about 95% identity with the sequence of SEQ ID NO:120. Accordingly, in one embodiment, the nupC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:120. In another embodiment, the nupC gene comprises the sequence of SEQ ID NO:120. In yet another embodiment the nupC gene consists of the sequence of SEQ ID NO:120. 
     In one embodiment, the nupC (also referred to herein as VC2352) gene is a nupC gene from  Vibrio cholerae . In one embodiment, the nupC gene has at least about 80% identity with the sequence of SEQ ID NO:121. Accordingly, in one embodiment, the nupC gene has at least about 90% identity with the sequence of SEQ ID NO:121. Accordingly, in one embodiment, the nupC gene has at least about 95% identity with the sequence of SEQ ID NO:121. Accordingly, in one embodiment, the nupC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:121. In another embodiment, the nupC gene comprises the sequence of SEQ ID NO:121. In yet another embodiment the nupC gene consists of the sequence of SEQ ID NO:121. 
     In one embodiment, the nupC (also referred to herein as VC1953) gene is a nupC gene from  Vibrio cholerae . In one embodiment, the nupC gene has at least about 80% identity with the sequence of SEQ ID NO:122. Accordingly, in one embodiment, the nupC gene has at least about 90% identity with the sequence of SEQ ID NO:122. Accordingly, in one embodiment, the nupC gene has at least about 95% identity with the sequence of SEQ ID NO:122. Accordingly, in one embodiment, the nupC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:122. In another embodiment, the nupC gene comprises the sequence of SEQ ID NO:122. In yet another embodiment the nupC gene consists of the sequence of SEQ ID NO:122. 
     In one embodiment, the nupC (also referred to herein as VCA0179) gene is a nupC gene from  Vibrio cholerae . In one embodiment, the nupC gene has at least about 80% identity with the sequence of SEQ ID NO:123. Accordingly, in one embodiment, the nupC gene has at least about 90% identity with the sequence of SEQ ID NO:123. Accordingly, in one embodiment, the nupC gene has at least about 95% identity with the sequence of SEQ ID NO:123. Accordingly, in one embodiment, the nupC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:123. In another embodiment, the nupC gene comprises the sequence of SEQ ID NO:123. In yet another embodiment the nupC gene consists of the sequence of SEQ ID NO:123. 
     In one embodiment, the nucleoside transporter is encoded by a yutK gene, e.g., a yutK gene disclosed herein. In one embodiment, the yutK gene is a yutK gene from  Bacillus subtilis . In one embodiment, the yutK gene has at least about 80% identity with the sequence of SEQ ID NO:111. Accordingly, in one embodiment, the yutK gene has at least about 90% identity with the sequence of SEQ ID NO:111. Accordingly, in one embodiment, the yutK gene has at least about 95% identity with the sequence of SEQ ID NO:111. Accordingly, in one embodiment, the yutK gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:111. In another embodiment, the yutK gene comprises the sequence of SEQ ID NO:111. In yet another embodiment the yutK gene consists of the sequence of SEQ ID NO:111. 
     In one embodiment, the nucleoside transporter is encoded by a yxjA gene, e.g., a yxjA gene disclosed herein. In one embodiment, the yxjA gene is a yxjA gene from  Bacillus subtilis . In one embodiment, the yxjA gene has at least about 80% identity with the sequence of SEQ ID NO:112. Accordingly, in one embodiment, the yxjA gene has at least about 90% identity with the sequence of SEQ ID NO:112. Accordingly, in one embodiment, the yxjA gene has at least about 95% identity with the sequence of SEQ ID NO:112. Accordingly, in one embodiment, the yxjA gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:112. In another embodiment, the yxjA gene comprises the sequence of SEQ ID NO:112. In yet another embodiment the yxjA gene consists of the sequence of SEQ ID NO:112. 
     In one embodiment, the nucleoside transporter is encoded by a sodium-dependent nucleoside transporter gene, e.g., a sodium-dependent nucleoside transporter gene disclosed herein. In one embodiment, the sodium-dependent nucleoside transporter gene is a CC2089 (also referred to herein as CcCNT) gene. In one embodiment, the sodium-dependent nucleoside transporter gene is a CC2089 gene from  Caulobacter crescentus . In one embodiment, the sodium-dependent nucleoside transporter gene has at least about 80% identity with the sequence of SEQ ID NO:113. Accordingly, in one embodiment, the sodium-dependent nucleoside transporter gene has at least about 90% identity with the sequence of SEQ ID NO:113. Accordingly, in one embodiment, the sodium-dependent nucleoside transporter gene has at least about 95% identity with the sequence of SEQ ID NO:113. Accordingly, in one embodiment, the sodium-dependent nucleoside transporter gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:113. In another embodiment, the sodium-dependent nucleoside transporter gene comprises the sequence of SEQ ID NO:113. In yet another embodiment the sodium-dependent nucleoside transporter gene consists of the sequence of SEQ ID NO:113. 
     In one embodiment, the nucleoside transporter is encoded by a yeiJ gene, e.g., a yeiJ gene disclosed herein. In one embodiment, the yeiJ gene is a yeiJ gene from  Escherichia coli . In one embodiment, the yeiJ gene has at least about 80% identity with the sequence of SEQ ID NO:114. Accordingly, in one embodiment, the yeiJ gene has at least about 90% identity with the sequence of SEQ ID NO:114. Accordingly, in one embodiment, the yeiJ gene has at least about 95% identity with the sequence of SEQ ID NO:114. Accordingly, in one embodiment, the yeiJ gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:114. In another embodiment, the yeiJ gene comprises the sequence of SEQ ID NO:114. In yet another embodiment the yeiJ gene consists of the sequence of SEQ ID NO:114. 
     In one embodiment, the nucleoside transporter is encoded by a yeiM gene, e.g., a yeiM gene disclosed herein. In one embodiment, the yeiM gene is a yeiM gene from  Escherichia coli . In one embodiment, the yeiM gene has at least about 80% identity with the sequence of SEQ ID NO:115. Accordingly, in one embodiment, the yeiM gene has at least about 90% identity with the sequence of SEQ ID NO:115. Accordingly, in one embodiment, the yeiM gene has at least about 95% identity with the sequence of SEQ ID NO:115. Accordingly, in one embodiment, the yeiM gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:115. In another embodiment, the yeiM gene comprises the sequence of SEQ ID NO:115. In yet another embodiment the yeiM gene consists of the sequence of SEQ ID NO:115. 
     In one embodiment, the nucleoside transporter is encoded by a HI0519 gene, e.g., a HI0519 gene disclosed herein. In one embodiment, the HI0519 gene is a HI0519 gene from  Haemophilus influenzae . In one embodiment, the HI0519 gene has at least about 80% identity with the sequence of SEQ ID NO:116. Accordingly, in one embodiment, the HI0519 gene has at least about 90% identity with the sequence of SEQ ID NO:116. Accordingly, in one embodiment, the HI0519 gene has at least about 95% identity with the sequence of SEQ ID NO:116. Accordingly, in one embodiment, the HI0519 gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:116. In another embodiment, the HI0519 gene comprises the sequence of SEQ ID NO:116. In yet another embodiment the HI0519 gene consists of the sequence of SEQ ID NO:116. 
     In one embodiment, the nucleoside transporter is encoded by a yegT gene, e.g., a yegT gene disclosed herein. In one embodiment, the yegT gene is a yegT gene from  Escherichia coli . In one embodiment, the yegT gene has at least about 80% identity with the sequence of SEQ ID NO:124. Accordingly, in one embodiment, the yegT gene has at least about 90% identity with the sequence of SEQ ID NO:124. Accordingly, in one embodiment, the yegT gene has at least about 95% identity with the sequence of SEQ ID NO:124. Accordingly, in one embodiment, the yegT gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:124. In another embodiment, the yegT gene comprises the sequence of SEQ ID NO:124. In yet another embodiment the yegT gene consists of the sequence of SEQ ID NO:124. 
     In one embodiment, the nucleoside transporter is encoded by a nupG gene, e.g., a nupG gene disclosed herein. In one embodiment, the nupG gene is a nupG gene from  Escherichia coli . In one embodiment, the nupG gene has at least about 80% identity with the sequence of SEQ ID NO:125. Accordingly, in one embodiment, the nupG gene has at least about 90% identity with the sequence of SEQ ID NO:125. Accordingly, in one embodiment, the nupG gene has at least about 95% identity with the sequence of SEQ ID NO:125. Accordingly, in one embodiment, the nupG gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:125. In another embodiment, the nupG gene comprises the sequence of SEQ ID NO:125. In yet another embodiment the nupG gene consists of the sequence of SEQ ID NO:125. 
     In one embodiment, the nucleoside transporter is encoded by a xapB gene, e.g., a xapB gene disclosed herein. In one embodiment, the xapB gene is a xapB gene from  Escherichia coli . In one embodiment, the xapB gene has at least about 80% identity with the sequence of SEQ ID NO:126. Accordingly, in one embodiment, the xapB gene has at least about 90% identity with the sequence of SEQ ID NO:126. Accordingly, in one embodiment, the xapB gene has at least about 95% identity with the sequence of SEQ ID NO:126. Accordingly, in one embodiment, the xapB gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:126. In another embodiment, the xapB gene comprises the sequence of SEQ ID NO:126. In yet another embodiment the xapB gene consists of the sequence of SEQ ID NO:126. 
     In one embodiment, the nucleoside transporter is encoded by a CC1628 gene, e.g., a CC1628 gene disclosed herein. In one embodiment, the CC1628 gene is a CC1628 gene from  Caulobacter crescentus . In one embodiment, the CC1628 gene has at least about 80% identity with the sequence of SEQ ID NO:127. Accordingly, in one embodiment, the CC1628 gene has at least about 90% identity with the sequence of SEQ ID NO:127. Accordingly, in one embodiment, the CC1628 gene has at least about 95% identity with the sequence of SEQ ID NO:127. Accordingly, in one embodiment, the CC1628 gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:127. In another embodiment, the CC1628 gene comprises the sequence of SEQ ID NO:127. In yet another embodiment the CC1628 gene consists of the sequence of SEQ ID NO:127. 
     In one embodiment, the nucleoside transporter is a cytosine permease, e.g., CodB. In one embodiment, the nucleoside transporter is encoded by a codB gene, e.g., a codB gene disclosed herein. In one embodiment, the codB gene is a codB gene from  Escherichia coli . In one embodiment, the codB gene has at least about 80% identity with the sequence of SEQ ID NO:128. Accordingly, in one embodiment, the codB gene has at least about 90% identity with the sequence of SEQ ID NO:128. Accordingly, in one embodiment, the codB gene has at least about 95% identity with the sequence of SEQ ID NO:128. Accordingly, in one embodiment, the codB gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:128. In another embodiment, the codB gene comprises the sequence of SEQ ID NO:128. In yet another embodiment the codB gene consists of the sequence of SEQ ID NO:128. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the nucleoside transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more nucleosides into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the nucleoside transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more nucleosides, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the nucleoside transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more nucleosides into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the nucleoside transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more nucleoside into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous nucleoside transporter and a second heterologous nucleoside transporter. For, example, in one embodiment, the recombinant bacterial cell comprises at least one outer membrance nucleoside transporter, e.g., tsx, and at least one inner membrane nucleoside transporter, e.g., nupC and/or nupG. In one embodiment, said first nucleoside transporter is derived from a different organism than said second nucleoside transporter. In some embodiments, said first nucleoside transporter is derived from the same organism as said second nucleoside transporter. In some embodiments, said first nucleoside transporter imports the same nucleoside as said second nucleoside transporter. In other embodiment, said first nucleoside transporter imports a different nucleoside from said second nucleoside transporter. In some embodiments, said first nucleoside transporter is a wild-type nucleoside transporter and said second nucleoside transporter is a mutagenized version of said first nucleoside transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous nucleoside transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous nucleoside transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous nucleoside transporters or more. 
     In one embodiment, the nucleoside transporter imports one nucleoside into the bacterial cell. In another embodiment, the nucleoside transporter imports two nucleosides into the bacterial cell. In yet another embodiment, the nucleoside transporter imports three nucleosides into the bacterial cell. In another embodiment, the nucleoside transporter imports four or more nucleosides into the cell. In one embodiment, the nucleoside transporter is an outer membrane nucleoside transporter. In one embodiment, the nucleoside transporter is an inner membrane nucleoside transporter. In one embodiment, the nucleoside transporter is an adenosine transporter. In another embodiment, the nucleoside transporter is an guanosine transporter. In another embodiment, the nucleoside transporter is an uridine transporter. In another embodiment, the amino acid transporter is a inosine transporter. In another embodiment, the amino acid transporter is a xanthosine transporter. In another embodiment, the amino acid transporter is a thymidine transporter. In one embodiment, the nucleoside transporter is an cytidine transporter. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding a nucleoside transporter, e.g., an adenosine transporter, may be used to treat a disease, condition, and/or symptom associated with cancer, e.g., a cancer described herein. In some embodiments, the recombinant bacterial cells described herein may be used to reduce, ameliorate, or eliminate one or more symptom(s) associated with a cancer. 
     For example, an important barrier to successful cancer immunotherapy is that tumors employ a number of mechanisms to facilitate immune escape, including the production of anti-inflammatory cytokines, the recruitment of regulatory immune subsets, and the production of immunosuppressive metabolites. One such immunosuppressive pathway is the production of extracellular adenosine, a potent immunosuppressive molecule, by CD73. The purinergic system regulates and refines immune cell functions, such as cell-to-cell interactions, cytokine and chemokine secretion, surface antigen shedding, intracellular pathogen removal, and generating reactive oxygen species. Extracellular ATP, released by damaged or dying cells and bacteria, promotes the recruitment of immune phagocytes and activates P2X7R, a coactivator of the NLRP3 inflammasome, which then triggers the production of proinflammatory cytokines, such as IL-10 and IL-18. The catabolism of extracellular ATP into ADP, AMP and adenosine is controlled by glycosylphosphatidylinositol (GPI-) anchored ectonucleotidases and membrane-bound kinases. CD39 (ecto-nucleoside triphosphate diphosphohydrolase 1, E-NTPDase1) hydrolyzes ATP into AMP, which is then dephosphorylated into adenosine by CD73 (ecto-5′-nucleotidase, Ecto5′NTase). Thus, CD39 and CD73 act in concert to convert proinflammatory ATP into immunosuppressive adenosine. Notably, the activity of CD39 is reversible by the actions of NDP kinase and adenylate kinase, whereas the activity of CD73 is virtually irreversible. Thus, CD73 represents a crucial checkpoint in the conversion of an ATP-driven proinflammatory environment to an anti-inflammatory milieu induced by adenosine. Stated another way, CD73 negatively regulates the proinflammatory effects of extracellular adenosine triphosphate (ATP). 
     In the tumor setting, CD39 and CD73 generate increased adenosine levels characteristic of the tumor microenvironment. High expression and activity of CD39 and CD73 has been observed in several blood or solid tumors. In addition, CD39- and CD73-expressing cancer exosomes can also raise adenosine levels within the tumor microenvironment. The CD39/CD73 complex participates in the process of tumor immunoescape, by inhibiting the activation, clonal expansion, and homing of tumor-specific T cells (in particular, T helper and cytotoxic T cells), impairing tumor cell killing by cytolytic effector T lymphocytes, and inducing the suppressive capabilities of Treg and Th17 cells, and enhancing the conversion of type 1 macrophages into tumor-promoting type 2 macrophages (reviewed in Antonioli et al., Trends Mol Med. 2013 June; 19(6): 355-367. CD39 and CD73 in immunity and inflammation). Myeloid-derived suppressor cells (MDSCs), also appear to promote tumor growth by a CD39-mediated mechanism. 
     Beside its immunoregulatory roles, the ectonucleotidase pathway contributes directly to the modulation of cancer cell growth, differentiation, invasion, migration, metastasis, and tumor angiogenesis. Agents targeting these enzymes show anti-tumor efficacy and a favorable tolerability profile in several murine models of malignancy (Anonioli et al., 2013). In some embodiments, the genetically engineered bacteria comprise a means for removing excess adenosine from the tumor microenvironment. Many bacteria scavenge low concentrations of nucleosides from the environment for synthesis of nucleotides and deoxynucleotides by salvage pathways of synthesis. Additionally, in  Escherichia coli , nucleosides can be used as the sole source of nitrogen and carbon for growth (Neuhard J, Nygaard P. Biosynthesis and conversion of nucleotides, purines and pyrimidines. In: Neidhardt F C, Ingraham J L, Low K B, Magasanik B, Schaechter M, Umbarger H E, editors.  Escherichia coli  and  Salmonella typhimurium : Cellular and molecular biology. Washington D.C.: ASM Press; 1987. pp. 445-473). Two evolutionarily unrelated cation-linked transporter families, the Concentrative Nucleoside Transporter (CNT) family and the Nucleoside:H +  Symporter (NHS) family, are responsible for nucleoside uptake (see e.g., Cabrita et al.,  Biochem. Cell Biol . Vol. 80, 2002. Molecular biology and regulation of nucleoside and nucleobase transporter proteins in eukaryotes and prokaryotes), the contents of which is herein incorporated by reference in its entirety. NupC and NupG, are the transporter family members in  E. coli . Mutants defective in both the nupC and nupG genes cannot grow with nucleosides as a single carbon source. Both of these transporters are proton-linked but they differ in their selectivity. NupG is capable of transporting a wide range of nucleosides and deoxynucleosides; in contrast, NupC does not transport guanosine or deoxyguanosine. Homologs of NupG from  E. coli  are found in a wide range of eubacteria, including human gut pathogens such as  Salmonella typhimurium , organisms associated with periodontal disease such as  Porphyromonas gingivalis  and  Prevotella intermedia , and plant pathogens in the genus  Erwinia  (As described in Vaziri et al., Mol Membr Biol. 2013 March; 30(1-2): 114-128. Use of molecular modelling to probe the mechanism of the nucleoside transporter NupG, the contents of which is herein incorporated by reference in its entirety). Putative bacterial transporters from the CNT superfamily and transporters from the NupG/XapB family include those listed herein. In addition, codB (GenBank P25525,  Escherichia coli ) was identified based on homology to a yeast transporter family termed the uracil/allantoin transpertor family (Cabrita et al., supra). 
     Thus, the genetically engineered bacteria comprise a means for metabolizing or degrading adenosine. In some embodiments, the genetically engineered bacteria comprise one or more gene sequences encoding one or more enzymes that are capable of converting adenosine to urate. In some embodiments, the genetically engineered bacteria comprise sequence(s) encoding add, xapA, deoD, xdhA, xdhB, and xdhC genes from  E. coli . In some embodiments, the genetically engineered bacteria or genetically engineered oncolytic virus further comprise a means for importing adenosine into the engineered bacteria from the tumor microenvironment. In some embodiments, the genetically engineered bacteria comprise sequence for encoding a nucleoside transporter. In some embodiments, the genetically engineered bacteria for encoding an adenosine transporter. In certain embodiments, genetically engineered bacteria for encoding  E. coli  Nucleoside Permease nupG or nupC. In some embodiments, the genetically engineered bacteria comprise sequence(s) encoding add, xapA, deoD, xdhA, xdhB, and xdhC genes from  E. coli  and comprise sequence encoding a nucleoside or adenosine transporter. In some embodiments, the genetically engineered bacteria comprise sequence(s) encoding add, xapA, deoD, xdhA, xdhB, and xdhC genes from  E. coli  and comprise sequence encoding nupG or nupC. An exemplary engineered bacteria is shown in  FIG. 34 . 
     C. Kynurenine Transporters 
     The catabolism of the essential amino acid tryptophan is a central pathway maintaining the immunosuppressive microenvironment in many types of cancers. Tumor cells or myeloid cells in the tumor microenvironment express high levels of indoleamine-2,3-dioxygenase 1 (IDO1), which is the first and rate-limiting enzyme in the degradation of tryptophan. This enzymatic activity results in the depletion of tryptophan in the local microenvironment and subsequent inhibition of T cell responses, which results in immunosuppression (as T cells are particularly sensitive to low tryptophan levels). More recent preclinical studies suggest an alternative route of tryptophan degradation in tumors via the enzyme TRP-2,3-dioxygenase 2 (TDO). Thus, tumor cells may express and catabolize tryptophan via TDO instead of or in addition to IDO1. 
     In addition, several studies have proposed that immunosuppression by tryptophan degradation is not solely a consequence of lowering local tryptophan levels but also of accumulating high levels of tryptophan metabolites. Preclinical studies and analyses of human tumor tissue have demonstrated that T cell responses are inhibited by tryptophan metabolites, primarily by binding to the aryl hydrocarbon receptor (AHR), a cytoplasmic transcription factor. These studies show that binding of the tryptophan metabolite kynurenine to the aryl hydrocarbon receptor results in reprograming the differentiation of naïve CD4+T-helper (Th) cells favoring a regulatory T cells phenotype (Treg) while suppressing the differentiation into interleukin-17 (IL-17)-producing Th (Th17) cells. Activation of the aryl hydrogen receptor also results in promoting a tolerogenic phenotype on dendritic cells. As discussed above, studies have shown that the binding of kynurenine to the aryl hydrocarbon receptor results in the production of regulatory T cells (Tregs). Thus, in some embodiments, the engineered microbe has a mechanism for importing (transporting) Kynurenine from the local environment into the cell. Thus, in some embodiments, the genetically engineered bacteria comprise gene sequence(s) encoding a kynureninase transporter. In some embodiments, the genetically engineered bacteria comprise one or more copies of aroP, tnaB or mtr gene. 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a kynurenine transporter. In one embodiment, the kynurenine transporter transports kynurenine into the cell. 
     The uptake of kynurenine into bacterial cells is mediated by proteins well known to those of skill in the art. In one embodiment, the at least one gene encoding a transporter is a gene selected from the group consisting of mtr, aroP and tnaB. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous gene selected from the group consisting of mtr, aroP and tnaB. In one embodiment, the at least one gene encoding a kynurenine transporter is the  Escherichia coli  mtr gene. In one embodiment, the at least one gene encoding a kynurenine transporter is the  Escherichia coli  aroP gene. In one embodiment, the at least one gene encoding a kynurenine transporter is the  Escherichia coli  tnaB gene. 
     In some embodiments, the kynurenine transporter is encoded by a kynurenine transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Corynebacterium, Sacharomyces, Escherichia coli, Saccharomyces cerevisiae  or  Corynebacterium glutamicum . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a kynurenine transporter, a functional variant of a kynurenine transporter, or a functional fragment of transporter of kynurenine are well known to one of ordinary skill in the art. 
     Kynurenine transporters may be expressed or modified in the bacteria in order to enhance kynurenine transport into the cell. Specifically, when the kynurenine transporter is expressed in the recombinant bacterial cells, the bacterial cells import more kynurenine(s) into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a kynurenine transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a kynurenine transporter and a genetic modification that reduces export of a kynurenine, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a kynurenine transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a kynurenine transporter. In some embodiments, the at least one native gene encoding a kynurenine transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a kynurenine transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native kynurenine transporter, as well as at least one copy of at least one heterologous gene encoding a kynurenine transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a kynurenine transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a kynurenine transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a kynurenine transporter, wherein said kynurenine transporter comprises a kynurenine sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the kynurenine sequence of a polypeptide encoded by a kynurenine transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a kynurenine transporter or functional variants of a kynurenine transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a kynurenine transporter relates to an element having qualitative biological activity in common with the wild-type kynurenine transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated kynurenine transporter is one which retains essentially the same ability to import a kynurenine into the bacterial cell as does the kynurenine transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a kynurenine transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a kynurenine transporter. 
     In one embodiment, the genes encoding the kynurenine transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the kynurenine transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a kynurenine transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a kynurenine transporter is mutagenized; mutants exhibiting increased kynurenine import are selected; and the mutagenized at least one gene encoding a kynurenine transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a kynurenine transporter is mutagenized; mutants exhibiting decreased kynurenine import are selected; and the mutagenized at least one gene encoding a kynurenine transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a kynurenine transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a kynurenine transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a kynurenine transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a kynurenine transporter in nature. In some embodiments, the at least one gene encoding the kynurenine transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the kynurenine transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the kynurenine transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the kynurenine transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a kynurenine transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a kynurenine transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a kynurenine transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a kynurenine transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a kynurenine transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a kynurenine transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a kynurenine transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a kynurenine transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the kynurenine transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the kynurenine transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the kynurenine transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the kynurenine transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In one embodiment, the mtr gene has at least about 80% identity with the sequence of SEQ ID NO:46. Accordingly, in one embodiment, the mtr gene has at least about 90% identity with the sequence of SEQ ID NO:46. Accordingly, in one embodiment, the mtr gene has at least about 95% identity with the sequence of SEQ ID NO:46. Accordingly, in one embodiment, the mtr gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:46. In another embodiment, the mtr gene comprises the sequence of SEQ ID NO:46. In yet another embodiment the mtr gene consists of the sequence of SEQ ID NO:46. 
     In one embodiment, the tnaB gene has at least about 80% identity with the sequence of SEQ ID NO:47. Accordingly, in one embodiment, the tnaB gene has at least about 90% identity with the sequence of SEQ ID NO:47. Accordingly, in one embodiment, the tnaB gene has at least about 95% identity with the sequence of SEQ ID NO:47. Accordingly, in one embodiment, the tnaB gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:47. In another embodiment, the tnaB gene comprises the sequence of SEQ ID NO:47. In yet another embodiment the tnaB gene consists of the sequence of SEQ ID NO:47. 
     In one embodiment, the aroP gene has at least about 80% identity with the sequence of SEQ ID NO:48. Accordingly, in one embodiment, the aroP gene has at least about 90% identity with the sequence of SEQ ID NO:48. Accordingly, in one embodiment, the aroP gene has at least about 95% identity with the sequence of SEQ ID NO:48. Accordingly, in one embodiment, the aroP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:48. In another embodiment, the aroP gene comprises the sequence of SEQ ID NO:48. In yet another embodiment the aroP gene consists of the sequence of SEQ ID NO:48. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the kynurenine transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more kynurenine into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the kynurenine transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more kynurenine, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the kynurenine transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more kynurenine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the kynurenine transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more kynurenine into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous kynurenine transporter and a second heterologous kynurenine transporter. In one embodiment, said first kynurenine transporter is derived from a different organism than said second kynurenine transporter. In some embodiments, said first kynurenine transporter is derived from the same organism as said second kynurenine transporter. In some embodiments, said first kynurenine transporter imports the same kynurenine as said second kynurenine transporter. In other embodiment, said first kynurenine transporter imports a different kynurenine from said second kynurenine transporter. In some embodiments, said first kynurenine transporter is a wild-type kynurenine transporter and said second kynurenine transporter is a mutagenized version of said first kynurenine transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous kynurenine transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous kynurenine transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous kynurenine transporters or more. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding a kynurenine transporter may be used to treat a disease, condition, and/or symptom associated with cancer, e.g., a cancer described herein. In some embodiments, the recombinant bacterial cells described herein may be used to reduce, ameliorate, or eliminate one or more symptom(s) associated with a cancer. 
     Means for optimizing kynurenine uptake are provided in the Example section. 
     D. Prostaglandin E2 Transporters 
     Prostaglandin E2 (PGE2) is overproduced in many tumors, where it aids in cancer progression. PGE2 is a pleiotropic molecule involved in numerous biological processes, including angiogenesis, apoptosis, inflammation, and immune suppression. PGE2 is synthesized from arachidonic acid by cyclooxygenase 2 (COX-2). COX-2, converts arachidonic acid (AA) to prostaglandin endoperoxide H2 (PGH2). PHG2 is then converted to PHE2 by prostaglandin E synthase (PGES), of which there are three forms. PGE2 can be catabolized into biologically inactive 15-keto-PGs by 15-PGDH and carbonyl reductase or secreted by the transporter MRP4. 
     MDSCs are thought to play a key role in the PGE2 production in the tumor environment. Tumor derived factors induce COX2, PGES1, and MRP4 and downregulate the expression of 15-PGDH in MDSCs, and is associated with MDSC suppressive activity. Inhibition of PGE2 through COX-2 inhibitors show promise as cancer treatments, but systemic administration is associated with serious side effects, and in the case of the COX-2 inhibitor celecoxib, resistance to tumor prevention has been observed. 
     In addition to inhibition of PGE production, the degradation of PGE2 by 15-hydroxyprostaglandin dehydrogenase (15-PGDH) is another way to reduce PGE2 levels in tumors. A lack of prostaglandin dehydrogenase prevents catabolism of prostaglandin E2, which helps cancer cells both to evade the immune system and circumvent drug treatment. Recent studies have demonstrated that 15-PGDH delivered locally to the tumor microenvironment can effect an antitumor immune response. For example, injection of an adenovirus encoding 15-PGDH into mouse tumors comprising non-lymphocyte white blood cells expressing CD11b (which have increased PGE2 levels, higher COX-2 expression and significantly reduced expression of 15-PGDH as compared with cells from outside the tumor), resulted in significantly slowed tumor growth. These studies further showed that 15-PGDH expression was highest in tumor cells but also significant in tumor-associated CD11b cells, where it produced a four-fold reduction in PGE2 secretion. This was associated with reduced secretion of immunosuppressive cytokines by the CD11b cells which resulted in a switch in their fate, promoting their differentiation into dendritic cells. These studies show that overproduction of PGE2 in tumors contributes to immune evasion by preventing maturation of antigen-presenting cells, and that evasion can be overcome by enforced expression of 15-PGDH. (Eruslanov et al., Volume 88, November 2010 Journal of Leukocyte Biology; Tumor-mediated induction of myeloid-derived suppressor cells and M2-polarized macrophages by altering intracellular PGE2 catabolism in myeloid cells). 
     Other studies confirm the benefit of local PGE2 catabolism in cancer treatment. Celecoxib, a non-steroidal anti-inflammatory COX-2 inhibitor used to treat pain and inflammation, reduces the recurrence of colon adenomas but does not work in some patients who have low levels of 15-PGDH. These results correspond with studies which show that in mice, gene knockout of 15-PGDH confers near-complete resistance to the ability of celecoxib to prevent colon tumors. These and other studies highlight the potential importance of reducing PGE2 levels in cancer, either through inhibition of synthesis or promotion of catalysis or both. 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a prostaglandin E2 (PGE2) transporter. In one embodiment, the PGE2 transporter transports PGE2 into the cell. 
     The uptake of PGE2 into bacterial cells is mediated by proteins well known to those of skill in the art. 
     In some embodiments, the PGE2 transporter is encoded by a PGE2 transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Corynebacterium, Escherichia coli, Saccharomyces cerevisiae  or  Corynebacterium glutamicum . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a PGE2 transporter, a functional variant of a PGE2 transporter, or a functional fragment of transporter of PGE2 are well known to one of ordinary skill in the art. For example, import of PGE2 may be determined using the methods as described in, the entire contents of each of which are expressly incorporated by reference herein. 
     PGE2 transporters may be expressed or modified in the bacteria in order to enhance PGE2 transport into the cell. Specifically, when the PGE2 transporter is expressed in the recombinant bacterial cells, the bacterial cells import more PGE2 into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a PGE2 transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a PGE2 transporter and a genetic modification that reduces export of a PGE2, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a PGE2 transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a PGE2 transporter. In some embodiments, the at least one native gene encoding a PGE2 transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a PGE2 transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native PGE2 transporter, as well as at least one copy of at least one heterologous gene encoding a PGE2 transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a PGE2 transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a PGE2 transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a PGE2 transporter, wherein said PGE2 transporter comprises a PGE2 sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the PGE2 sequence of a polypeptide encoded by a PGE2 transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a PGE2 transporter or functional variants of a PGE2 transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a PGE2 transporter relates to an element having qualitative biological activity in common with the wild-type PGE2 transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated PGE2 transporter is one which retains essentially the same ability to import PGE2 into the bacterial cell as does the PGE2 transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a PGE2 transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a PGE2 transporter. 
     In one embodiment, the genes encoding the PGE2 transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the PGE2 transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a PGE2 transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a PGE2 transporter is mutagenized; mutants exhibiting increased PGE2 import are selected; and the mutagenized at least one gene encoding a PGE2 transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a PGE2 transporter is mutagenized; mutants exhibiting decreased PGE2 import are selected; and the mutagenized at least one gene encoding a PGE2 transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a PGE2 transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a PGE2 transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a PGE2 transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a PGE2 transporter in nature. In some embodiments, the at least one gene encoding the PGE2 transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the PGE2 transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the PGE2 transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the PGE2 transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a PGE2 transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a PGE2 transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a PGE2 transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a PGE2 transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a PGE2 transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a PGE2 transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a PGE2 transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a PGE2 transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the PGE2 transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the PGE2 transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the PGE2 transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the PGE2 transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the PGE2 transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more PGE2 into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the PGE2 transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more PGE2, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the PGE2 transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more PGE2 into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the PGE2 transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more PGE2 into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous PGE2 transporter and a second heterologous PGE2 transporter. In one embodiment, said first PGE2 transporter is derived from a different organism than said second PGE2 transporter. In some embodiments, said first PGE2 transporter is derived from the same organism as said second PGE2 transporter. In some embodiments, said first PGE2 transporter is a wild-type PGE2 transporter and said second PGE2 transporter is a mutagenized version of said first PGE2 transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous PGE2 transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous PGE2 transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous PGE2 transporters or more. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding a PGE2 transporter may be used to treat a disease, condition, and/or symptom associated with cancer, e.g., a cancer described herein. In some embodiments, the recombinant bacterial cells described herein may be used to reduce, ameliorate, or eliminate one or more symptom(s) associated with a cancer. 
     E. Lactic Acid Transporters 
     The anti-cancer immune response is influenced by the environmental pH; an acidic pH has been shown to inhibit the function of immune cells. Lowering the environmental pH to 6.0-6.5, as can be found in tumour masses, has been reported to lead to loss of T-cell function of human and murine tumour-infiltrating lymphocytes (eg impairment of cytolytic activity and cytokine secretion); the T-cell function could be completely restored by buffering the pH at physiological values. The primary cause responsible for the acidic pH and pH-dependent T-cell function-suppressive effect in a tumour micro-environment has been identified as lactic acid (as reviewed in Chio et al.,  J Pathol.  2013 August; 230(4): 350-355. Cancer-generated lactic acid: a regulatory, immunosuppressive metabolite?), the contents of which is herein incorporated by reference in its entirety. It has also been demonstrated that cancer-generated lactic acid and the resultant acidification of the micro-environment increase the expression of ARG1 in tumour-associated macrophages, characteristic of the M2 helper phenotype. 
     In some embodiments, the genetically engineered bacterium are able to import lactic acid from the tumor microenvironment. In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a lactic acid transporter. In one embodiment, the lactic acid transporter transports lactic acid into the cell. 
     The uptake of lactic acid into bacterial cells is mediated by proteins well known to those of skill in the art. 
     In some embodiments, the lactic acid transporter is encoded by a lactic acid transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Corynebacterium, Escherichia coli, Saccharomyces cerevisiae  or  Corynebacterium glutamicum . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a lactic acid transporter, a functional variant of a lactic acid transporter, or a functional fragment of transporter of lactic acid are well known to one of ordinary skill in the art. 
     lactic acid transporters may be expressed or modified in the bacteria in order to enhance lactic acid transport into the cell. Specifically, when the lactic acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import more lactic acid into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a lactic acid transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a lactic acid transporter and a genetic modification that reduces export of a lactic acid, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a lactic acid transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a lactic acid transporter. In some embodiments, the at least one native gene encoding a lactic acid transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a lactic acid transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native lactic acid transporter, as well as at least one copy of at least one heterologous gene encoding a lactic acid transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a lactic acid transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a lactic acid transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a lactic acid transporter, wherein said lactic acid transporter comprises a lactic acid sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the lactic acid sequence of a polypeptide encoded by a lactic acid transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a lactic acid transporter or functional variants of a lactic acid transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a lactic acid transporter relates to an element having qualitative biological activity in common with the wild-type lactic acid transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated lactic acid transporter is one which retains essentially the same ability to import lactic acid into the bacterial cell as does the lactic acid transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a lactic acid transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a lactic acid transporter. 
     In one embodiment, the genes encoding the lactic acid transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the lactic acid transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a lactic acid transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a lactic acid transporter is mutagenized; mutants exhibiting increased lactic acid import are selected; and the mutagenized at least one gene encoding a lactic acid transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a lactic acid transporter is mutagenized; mutants exhibiting decreased lactic acid import are selected; and the mutagenized at least one gene encoding a lactic acid transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a lactic acid transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a lactic acid transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a lactic acid transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a lactic acid transporter in nature. In some embodiments, the at least one gene encoding the lactic acid transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the lactic acid transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the lactic acid transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the lactic acid transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a lactic acid transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a lactic acid transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a lactic acid transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a lactic acid transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a lactic acid transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a lactic acid transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a lactic acid transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a lactic acid transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the lactic acid transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the lactic acid transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the lactic acid transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the lactic acid transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the lactic acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more lactic acid into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the lactic acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more lactic acid, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the lactic acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more lactic acid into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the lactic acid transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more lactic acid into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous lactic acid transporter and a second heterologous lactic acid transporter. In one embodiment, said first lactic acid transporter is derived from a different organism than said second lactic acid transporter. In some embodiments, said first lactic acid transporter is derived from the same organism as said second lactic acid transporter. In some embodiments, said first lactic acid transporter is a wild-type lactic acid transporter and said second lactic acid transporter is a mutagenized version of said first lactic acid transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous lactic acid transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous lactic acid transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous lactic acid transporters or more. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding a lactic acid transporter may be used to treat a disease, condition, and/or symptom associated with cancer, e.g., a cancer described herein. In some embodiments, the recombinant bacterial cells described herein may be used to reduce, ameliorate, or eliminate one or more symptom(s) associated with a cancer. 
     E. Propionate Transporters 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a propionate transporter. In one embodiment, the propionate transporter transports propionate into the cell. 
     The uptake of propionate into bacterial cells typically occurs via passive diffusion (see, for example, Kell et al., 1981 , Biochem. Biophys. Res. Commun.,  9981-8). However, the active import of propionate is also mediated by proteins well known to those of skill in the art. For example, a bacterial transport system for the update of propionate in  Corynebacterium glutamicum  named MctC (monocarboxylic acid transporter) is known (see, for example, Jolkver et al. (2009)  J. Bacteriol.  191(3): 940-8). The putP_6 propionate transporter from  Virgibacillus  species (UniProt A0A024QGU1) has also been identified. 
     Propionate transporters, may be expressed or modified in the bacteria of the invention in order to enhance propionate transport into the cell. Specifically, when the propionate transporter is expressed in the recombinant bacterial cells of the invention, the bacterial cells import more propionate into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. Thus, the genetically engineered bacteria comprising a heterologous gene encoding an propionate transporter may be used to import propionate into the bacteria and can be used to treat diseases associated with the catabolism of propionate, such as organic acidurias (including PA and MMA) and vitamin B 12  deficiencies. In one embodiment, the bacterial cell of the invention comprises a heterologous gene encoding an propionate transporter. 
     The uptake of propionate into bacterial cells is mediated by proteins well known to those of skill in the art. In one embodiment, the at least one gene encoding a propionate transporter is a gene selected from the group consisting of metC, PutP6, mctB, mctC, dip0780, dip0791, ce0909, ce0910, ce1091, ce1092, sco1822, sco1823, sco1218, sco1219, ce1091, sco5827, m_5160, m_5161, m_5165, m_5166, nfa 17930, nfa 17940, nfa 17950, nfa 17960, actP, yjcH, ywcB, and ywcA. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous gene selected from the group consisting of metC, PutP_6, mctB, mctC, dip0780, dip0791, ce0909, ce0910, ce1091, ce1092, sco1822, sco823, sco1218, sco1219, ce1091, sco5827, m_5160, m_5161, m_5165, m_5166, nfa 17930, nfa 17940, nfa 17950, nfa 17960, actP, yjcH, ywcB, and ywcA. In one embodiment, the at least one gene encoding a propionate transporter is the metC gene. In one embodiment, the at least one gene encoding a propionate transporter is the putP_6 gene. 
     In some embodiments, the propionate transporter is encoded by a propionate transporter gene derived from a bacterial genus or species, including but not limited to,  Bacillus, Campylobacter, Clostridium, Corynebacterium, Escherichia, Lactobacillus, Mycobacterium, Pseudomonas , Salmonella, Staphylococcus, Streptomyces, Bacillus subtilis, Campylobacter jejuni, Clostridium perfringens, Escherichia coli, Lactobacillus delbrueckii, Mycobacterium smegmatis, Nocardia farcinica,  Pseudomonas aeruginosa, Salmonella typhimurium, Virgibacillus , or  Staphylococcus aureus . In some embodiments, the propionate transporter gene is derived from  Virgibacillus . In some embodiments, the propionate transporter gene is derived from  Corynebacterium . In one embodiment, the propionate transporter gene is derived from  Corynebacterium glutamicum . In another embodiment, the propionate transporter gene is derived from  Corynebacterium diphtheria . In another embodiment, the propionate transporter gene is derived from  Corynebacterium efficiens . In another embodiment, the propionate transporter gene is derived from  Streptomyces coelicolor . In another embodiment, the propionate transporter gene is derived from  Mycobacterium smegmatis . In another embodiment, the propionate transporter gene is derived from  Nocardia farcinica . In another embodiment, the propionate transporter gene is derived from  E. coli . In another embodiment, the propionate transporter gene is derived from  B. subtilis . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a propionate transporter, a functional variant of a propionate transporter, or a functional fragment of transporter of propionate are well known to one of ordinary skill in the art. For example, propionate import can be assessed by expressing the protein, functional variant, or fragment thereof, in a recombinant bacterial cell that lacks an endogenous propionate transporter. Propionate import can also be assessed using mass spectrometry. Propionate import can also be expressed using gas chromatography. For example, samples can be injected into a Perkin Elmer Autosystem XL Gas Chromatograph containing a Supelco packed column, and the analysis can be performed according to manufacturing instructions (see, for example, Supelco I (1998) Analyzing fatty acids by packed column gas chromatography, Bulletin 856B:2014). Alternatively, samples can be analyzed for propionate import using high-pressure liquid chromatography (HPLC). For example, a computer-controlled Waters HPLC system equipped with a model 600 quaternary solvent delivery system, and a model 996 photodiode array detector, and components of the sample can be resolved with an Aminex HPX-87H (300 by 7.8 mm) organic acid analysis column (Bio-Rad Laboratories) (see, for example, Palacios et al., 2003 , J. Bacteriol.,  185(9):2802-2810). 
     Propionate transporters may be expressed or modified in the bacteria in order to enhance propionate transport into the cell. Specifically, when the propionate transporter is expressed in the recombinant bacterial cells, the bacterial cells import more propionate into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a propionate transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a propionate transporter and a genetic modification that reduces export of a propionate, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a propionate transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a propionate transporter. In some embodiments, the at least one native gene encoding a propionate transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a propionate transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native propionate transporter, as well as at least one copy of at least one heterologous gene encoding a propionate transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a propionate transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a propionate transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a propionate transporter, wherein said propionate transporter comprises a propionate sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the propionate sequence of a polypeptide encoded by a propionate transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a propionate transporter or functional variants of a propionate transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a propionate transporter relates to an element having qualitative biological activity in common with the wild-type propionate transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated propionate transporter is one which retains essentially the same ability to import propionate into the bacterial cell as does the propionate transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a propionate transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a propionate transporter. 
     In one embodiment, the genes encoding the propionate transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the propionate transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a propionate transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a propionate transporter is mutagenized; mutants exhibiting increased propionate import are selected; and the mutagenized at least one gene encoding a propionate transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a propionate transporter is mutagenized; mutants exhibiting decreased propionate import are selected; and the mutagenized at least one gene encoding a propionate transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a propionate transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a propionate transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a propionate transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a propionate transporter in nature. In some embodiments, the at least one gene encoding the propionate transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the propionate transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the propionate transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the propionate transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a propionate transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a propionate transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a propionate transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a propionate transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a propionate transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a propionate transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a propionate transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a propionate transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the propionate transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the propionate transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the propionate transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the propionate transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In one embodiment, the propionate transporter is MctC. In one embodiment, the mctC gene has at least about 80% identity to SEQ ID NO:129. Accordingly, in one embodiment, the mctC gene has at least about 90% identity to SEQ ID NO:129. Accordingly, in one embodiment, the mctC gene has at least about 95% identity to SEQ ID NO:12. Accordingly, in one embodiment, the mctC gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity to SEQ ID NO:129. In another embodiment, the mctC gene comprises the sequence of SEQ ID NO:129. In yet another embodiment the mctC gene consists of the sequence of SEQ ID NO:129. 
     In another embodiment, the propionate transporter is PutP_6. In one embodiment, the putP 6 gene has at least about 80% identity to SEQ ID NO:130. Accordingly, in one embodiment, the putP6 gene has at least about 90% identity to SEQ ID NO:130. Accordingly, in one embodiment, the putP 6 gene has at least about 95% identity to SEQ ID NO:130. Accordingly, in one embodiment, the putP 6 gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity to SEQ ID NO:130. In another embodiment, the putP 6 gene comprises the sequence of SEQ ID NO:130. In yet another embodiment the putP 6 gene consists of the sequence of SEQ ID NO:130. 
     Other propionate transporter genes are known to those of ordinary skill in the art. See, for example, Jolker et al.,  J. Bacteriol.,  2009, 191(3):940-948. In one embodiment, the propionate transporter comprises the mctBC genes from  C. glutamicum . In another embodiment, the propionate transporter comprises the dip0780 and dip0791 genes from  C. diphtheria . In another embodiment, the propionate transporter comprises the ce0909 and ce0910 genes from  C. efficiens . In another embodiment, the propionate transporter comprises the ce1091 and ce1092 genes from  C. efficiens . In another embodiment, the propionate transporter comprises the sco1822 and sco1823 genes from  S. coelicolor . In another embodiment, the propionate transporter comprises the sco1218 and sco1219 genes from  S. coelicolor . In another embodiment, the propionate transporter comprises the ce1091 and sco5827 genes from  S. coelicolor . In another embodiment, the propionate transporter comprises the m_5160, m_5161, m_5165, and m_5166 genes from  M. smegmatis . In another embodiment, the propionate transporter comprises the nfa 17930, nfa 17940, nfa 17950, and nfa 17960 genes from  N. farcinica . In another embodiment, the propionate transporter comprises the actP and yjcH genes from  E. coli . In another embodiment, the propionate transporter comprises the ywcB and ywcA genes from  B. subtilis.    
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the propionate transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more propionate into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the propionate transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more propionate, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the propionate transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more propionate into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the propionate transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more propionate into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous propionate transporter and a second heterologous propionate transporter. In one embodiment, said first propionate transporter is derived from a different organism than said second propionate transporter. In some embodiments, said first propionate transporter is derived from the same organism as said second propionate transporter. In some embodiments, said first propionate transporter is a wild-type propionate transporter and said second propionate transporter is a mutagenized version of said first propionate transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous propionate transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous propionate transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous propionate transporters or more. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding an propionate transporter may be used to treat a disease, condition, and/or symptom associated with the catabolism of propionate in a subject. In some embodiments, the recombinant bacterial cells described herein may be used to reduce, ameliorate, or eliminate one or more symptom(s) associated with these diseases or disorders. In one embodiment, the disorder associated with the catabolism of propionate is a metabolic disorder involving the abnormal catabolism of propionate. Metabolic diseases associated with abnormal catabolism of propionate include propionic acidemia (PA) and methylmalonic acidemia (MMA), as well as severe nutritional vitamin B 12  deficiencies. In one embodiment, the disease associated with abnormal catabolism of propionate is propionic acidemia. In one embodiment, the disease associated with abnormal catabolism of propionate is methylmalonic acidemia. In another embodiment, the disease associated with abnormal catabolism of propionate is a vitamin B 12  deficiency. 
     G. Bile Salt Acid Transporters 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a bile salt transporter. In one embodiment, the bile salt transporter transports bile salt into the cell. 
     The uptake of bile salt into bacterial cells is mediated by proteins well known to those of skill in the art. For example, the uptake of bile salts into the  Lactobacillus  and  Bifidobacterium  has been found to occur via the bile salt transporters CbsT1 and CbsT2 (see, e.g., Elkins et al.,  Microbiology,  147(Pt. 12):3403-3412 (2001), the entire contents of which are expressly incorporated herein by reference). Other proteins that mediate the import of bile salts into cells are well known to those of skill in the art. 
     In one embodiment, the at least one gene encoding a bile salt transporter is a cbsT1 or a cbsT2 gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous gene selected from a cbsT1 or a cbsT2 gene. In one embodiment, the at least one gene encoding a bile salt transporter is the cbsT1 gene. In one embodiment, the at least one gene encoding a bile salt transporter is the cbsT2 gene. In one embodiment, the bile acid transporter is the bile acid sodium symporter ASBT NM  (NMB0705 gene of  Neisseria meningitides ). 
     In some embodiments, the bile salt transporter is encoded by a bile salt transporter gene derived from a bacterial genus or species, including but not limited to,  Lactobacillus , for example,  Lactobacillus johnsonni  (e.g.,  Lactobacillus johnsonni  strain 100-100). In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of an transporter of a bile salt, a functional variant of an transporter of a bile salt, or a functional fragment of an transporter of a bile salt are well known to one of ordinary skill in the art. For example, bile salt import can be assessed as described in Elkins et al. (2001) Microbiology,  147:3403-3412, the entire contents of which are expressly incorporated herein by reference. 
     Bile salt transporters may be expressed or modified in the bacteria in order to enhance bile salt transport into the cell. Specifically, when the bile salt transporter is expressed in the recombinant bacterial cells, the bacterial cells import more bile salt into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a bile salt transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a bile salt transporter and a genetic modification that reduces export of a bile salt, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a bile salt transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a bile salt transporter. In some embodiments, the at least one native gene encoding a bile salt transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a bile salt transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native bile salt transporter, as well as at least one copy of at least one heterologous gene encoding a bile salt transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a bile salt transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a bile salt transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a bile salt transporter, wherein said bile salt transporter comprises a bile salt sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the bile salt sequence of a polypeptide encoded by a bile salt transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a bile salt transporter or functional variants of a bile salt transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a bile salt transporter relates to an element having qualitative biological activity in common with the wild-type bile salt transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated bile salt transporter is one which retains essentially the same ability to import bile salt into the bacterial cell as does the bile salt transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a bile salt transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a bile salt transporter. 
     In one embodiment, the genes encoding the bile salt transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the bile salt transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a bile salt transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a bile salt transporter is mutagenized; mutants exhibiting increased bile salt import are selected; and the mutagenized at least one gene encoding a bile salt transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a bile salt transporter is mutagenized; mutants exhibiting decreased bile salt import are selected; and the mutagenized at least one gene encoding a bile salt transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a bile salt transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a bile salt transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a bile salt transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a bile salt transporter in nature. In some embodiments, the at least one gene encoding the bile salt transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the bile salt transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the bile salt transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the bile salt transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a bile salt transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a bile salt transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a bile salt transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a bile salt transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a bile salt transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a bile salt transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a bile salt transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a bile salt transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the bile salt transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the bile salt transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the bile salt transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the bile salt transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In one embodiment, the bile salt transporter is the bile salt transporter CbsT1. In one embodiment, the cbsT1 gene has at least about 80% identity to SEQ ID NO:131. Accordingly, in one embodiment, the cbsT1 gene has at least about 90% identity to SEQ ID NO:131. Accordingly, in one embodiment, the cbsT1 gene has at least about 95% identity to SEQ ID NO:131. Accordingly, in one embodiment, the cbsT1 gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity to SEQ ID NO:131. In another embodiment, the cbsT1 gene comprises the sequence of SEQ ID NO:131. In yet another embodiment the cbsT1 gene consists of the sequence of SEQ ID NO:131. 
     In one embodiment, the bile salt transporter is the bile salt transporter CbsT2. In one embodiment, the cbsT2 gene has at least about 80% identity to SEQ ID NO:132. Accordingly, in one embodiment, the cbsT2 gene has at least about 90% identity to SEQ ID NO:132. Accordingly, in one embodiment, the cbsT2 gene has at least about 95% identity to SEQ ID NO:132. Accordingly, in one embodiment, the cbsT2 gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity to SEQ ID NO:132. In another embodiment, the cbsT2 gene comprises the sequence of SEQ ID NO:132. In yet another embodiment the cbsT2 gene consists of the sequence of SEQ ID NO:132. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the bile salt transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more bile salt into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the bile salt transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more bile salt, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the bile salt transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more bile salt into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the bile salt transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more bile salt into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous bile salt transporter and a second heterologous bile salt transporter. In one embodiment, said first bile salt transporter is derived from a different organism than said second bile salt transporter. In some embodiments, said first bile salt transporter is derived from the same organism as said second bile salt transporter. In some embodiments, said first bile salt transporter imports the same bile salt as said second bile salt transporter. In other embodiment, said first bile salt transporter imports a different bile salt from said second bile salt transporter. In some embodiments, said first bile salt transporter is a wild-type bile salt transporter and said second bile salt transporter is a mutagenized version of said first bile salt transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous bile salt transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous bile salt transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous bile salt transporters or more. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding an bile salt transporter may be used to treat a disease, condition, and/or symptom associated with bile salts. In some embodiments, the recombinant bacterial cells described herein may be used to reduce, ameliorate, or eliminate one or more symptom(s) associated with these diseases or disorders. In some embodiments, the disease or disorder associated with bile salts is cardiovascular disease, metabolic disease, liver disease, such as cirrhosis or NASH, gastrointestinal cancer, and/or  C. difficile  infection. In some embodiments, the disclosure provides methods for reducing, ameliorating, or eliminating one or more symptom(s) associated with these diseases, including but not limited to chest pain, heart failure, or weight gain. In some embodiments, the disease is secondary to other conditions, e.g., cardiovascular disease or liver disease. 
     H. Ammonia Transporters 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is an ammonia transporter. In one embodiment, the ammonia transporter transports ammonia into the cell. 
     The uptake of ammonia into bacterial cells is mediated by proteins well known to those of skill in the art. For example, the ammonium/methylammonium transport B (AmtB) protein is a membrane transport protein that transports ammonia into bacterial cells. In one embodiment, the at least one gene encoding an ammonia transporter is an amtB gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous an amtB gene. 
     In some embodiments, the ammonia transporter is encoded by an ammonia transporter gene derived from a bacterial genus or species, including but not limited to,  Corynebacterium , e.g.,  Corynebacterium glutamicum, Escherichia , e.g.,  Escherichia coli, Streptomyces , e.g.,  Streptomyces coelicolor , or  Ruminococcus , e.g.,  Ruminococcus albus . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of an ammonia transporter, a functional variant of an ammonia transporter, or a functional fragment of transporter of ammonia are well known to one of ordinary skill in the art. For example, import of ammonia may be determined using a methylammonium uptake assay, as described in Soupene et al. (1998)  Proc. Nat. Acad. Sci. U.S.A.  95(12): 7030-4, the entire contents of each of which are expressly incorporated by reference herein. 
     Ammonia transporters may be expressed or modified in the bacteria in order to enhance ammonia transport into the cell. Specifically, when the ammonia transporter is expressed in the recombinant bacterial cells, the bacterial cells import more ammonia into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding an ammonia transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding an ammonia transporter and a genetic modification that reduces export of a ammonia, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding an ammonia transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding an ammonia transporter. In some embodiments, the at least one native gene encoding an ammonia transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding an ammonia transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native ammonia transporter, as well as at least one copy of at least one heterologous gene encoding an ammonia transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding an ammonia transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding an ammonia transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding an ammonia transporter, wherein said ammonia transporter comprises an ammonia sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the ammonia sequence of a polypeptide encoded by an ammonia transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of an ammonia transporter or functional variants of an ammonia transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of an ammonia transporter relates to an element having qualitative biological activity in common with the wild-type ammonia transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated ammonia transporter is one which retains essentially the same ability to import ammonia into the bacterial cell as does the ammonia transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of an ammonia transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of an ammonia transporter. 
     In one embodiment, the genes encoding the ammonia transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the ammonia transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding an ammonia transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding an ammonia transporter is mutagenized; mutants exhibiting increased ammonia import are selected; and the mutagenized at least one gene encoding an ammonia transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding an ammonia transporter is mutagenized; mutants exhibiting decreased ammonia import are selected; and the mutagenized at least one gene encoding an ammonia transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding an ammonia transporter operably linked to a promoter. In one embodiment, the at least one gene encoding an ammonia transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding an ammonia transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding an ammonia transporter in nature. In some embodiments, the at least one gene encoding the ammonia transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the ammonia transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the ammonia transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the ammonia transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding an ammonia transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding an ammonia transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding an ammonia transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding an ammonia transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding an ammonia transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding an ammonia transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding an ammonia transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding an ammonia transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the ammonia transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the ammonia transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the ammonia transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the ammonia transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In one embodiment, the ammonia transporter is the ammonia transporter AmtB, for example the  Escherichia coli  AmtB. In one embodiment the ammonia transporter is encoded by a amtB gene. In one embodiment, the amtB gene has at least about 80% identity with the sequence of SEQ ID NO:133. Accordingly, in one embodiment, the amtB gene has at least about 90% identity with the sequence of SEQ ID NO:133. Accordingly, in one embodiment, the amtB gene has at least about 95% identity with the sequence of SEQ ID NO:133. Accordingly, in one embodiment, the amtB gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:133. In another embodiment, the amtB gene comprises the sequence of SEQ ID NO:133. In yet another embodiment the amtB gene consists of the sequence of SEQ ID NO:133. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the ammonia transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more ammonia into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the ammonia transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more ammonia, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the ammonia transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more ammonia into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the ammonia transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more ammonia into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous ammonia transporter and a second heterologous ammonia transporter. In one embodiment, said first ammonia transporter is derived from a different organism than said second ammonia transporter. In some embodiments, said first ammonia transporter is derived from the same organism as said second ammonia transporter. In some embodiments, said first ammonia transporter is a wild-type ammonia transporter and said second ammonia transporter is a mutagenized version of said first ammonia transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous ammonia transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous ammonia transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous ammonia transporters or more. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding an ammonia transporter may be used to treat a disease, condition, and/or symptom associated with hyperammonenia. In some embodiment, the recombinant bacterial cells described herein can be used to treat hepatic encephalopathy. In some embodiment, the recombinant bacterial cells described herein can be used to treat Huntington&#39;s disease. In some embodiments, the invention provides methods for reducing, ameliorating, or eliminating one or more symptom(s) associated with hepatic encephalopathy and Huntington&#39;s disease. In some embodiments, the symptom(s) associated thereof include, but are not limited to, seizures, ataxia, stroke-like lesions, coma, psychosis, vision loss, acute encephalopathy, cerebral edema, as well as vomiting, respiratory alkalosis, and hypothermia. 
     I. γ-Aminobutyric Acid (GABA) Transporters 
     γ-aminobutyric acid (GABA) is the predominant inhibitory neurotransmitter (C 4 H 9 NO 2 ) in the mammalian central nervous system. In humans, GABA is also directly responsible for regulating muscle tone. GABA is capable of activating the GABAA receptor, which is part of a ligand-gated ion channel complex, as well as the GABAs metabotropic G protein-coupled receptor. Neurons that produce GABA are known as “GABAergic” neurons, and activation of GABA receptors is described as GABAergic tone (i.e., increased activation of GABA receptors refers to increased GABAergic tone). 
     γ-Aminobutyric acid (GABA) is the predominant inhibitory neurotransmitter in the mammalian central nervous system. In humans, GABA activates the postsynaptic GABAA receptor, which is part of a ligand-gated chloride-specific ion channel complex. Activation of this complex on a post-synaptic neuron allows chloride ions to enter the neuron and exert an inhibitory effect. Alterations of such GABAergic neurotransmission have been implicated in the pathophysiology of several neurological disorders, including epilepsy (Jones-Davis and MacDonald (2003)  Curr. Opin. Pharmacol.  3(1): 12-8), Huntington&#39;s disease (Krogsgaard-Larsen (1992)  Pharmacol Toxicol.  70(2):95-104), and hepatic encephalopathy (Jones and Basile (1997)  Adv. Exp. Med. Biol.  420: 75-83). Neurons in the brain that are modulated by GABA are said to be under inhibitory GABAergic tone. This inhibitory tone prevents neuronal firing until a sufficiently potent stimulatory stimulus is received, or until the inhibitory tone is otherwise released. Increased GABAergic tone in hepatic encephalopathy (HE) was initially described in the early 1980s, based on a report of similar visual response patterns in rabbits with galactosamine-induced liver failure and rabbits treated with allosteric modulators of the GABAA receptor (e.g., pentobarbital, diazepam) (Jones and Basile, 1997). Clinical improvements in hepatic encephalopathy patients treated with a highly selective benzodiazapene antagonist at the GABAA receptor, flumazenil, further confirmed these observations (Banksy et al. (1985)  Lancet  1: 1324-5; Scollo-Lavizzari and Steinmann (1985)  Lancet  1: 1324. Increased GABAergic tone in HE has since been proposed as a consequence of one or more of the following: (1) increased GABA concentrations in the brain, (2) altered integrity of the GABAA receptor, and/or (3) increased concentrations of endogenous modulators of the GABAA receptor (Ahboucha and Butterworth (2004)  Metab. Brain Dis. 1 9(3-4):331-343). 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a GABA transporter. In one embodiment, the GABA transporter transports GABA into the cell. 
     The uptake of GABA into bacterial cells is mediated by proteins well known to those of skill in the art. For example, GABA uptake in  E. coli  is driven by membrane potential and facilitated by the membrane transport protein, GabP (Li et al. (2001) FEBS Lett. 494(3): 165-169. GabP is a member of the amino acid/polymaine/organocation (APC) transporter superfamily, one of the two largest families of secondary active transporters (Jack et al. (2000)  Microbiology  146: 1797-1814). GabP protein, encoded by the gabP gene, consists of 466 amino acids and 12 transmembrane alpha helices, wherein both N- and C-termini face the cytosol (Hu and King, (1998) Biochem J. 336(Pt 1): 69-76. The GabP residue sequence also includes a consensus amphipathic region (CAR), which is conserved between members of the APC family from bacteria to mammals (Hu and King, 1998). Upon entry into the cell, GABA is converted to succinyl semialdehyde (SSA) by GABA a-ketoglutarate transaminase (GSST). Succinate-semialdehyde dehydrogenase (SSDH) then catalyzes the second and only other specific step in GABA catabolism, the oxidation of succinyl semialdehyde to succinate (Dover and Halpern (1972)  J. Bacteriol.  109(2):835-43). Ultimately, succinate becomes a substrate for the citric acid (TCA) cycle. In one embodiment, the at least one gene encoding a GABA transporter is encoded by an gabP gene. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous an gabP gene. 
     In some embodiments, the GABA transporter is encoded by a GABA transporter gene derived from a bacterial genus or species, including but not limited to,  Bacillus , e.g.,  Bacillus subtilis , or  Escherichia , e.g.,  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a GABA transporter, a functional variant of a GABA transporter, or a functional fragment of transporter of GABA are well known to one of ordinary skill in the art. 
     GABA transporters may be expressed or modified in the bacteria in order to enhance GABA transport into the cell. Specifically, when the GABA transporter is expressed in the recombinant bacterial cells, the bacterial cells import more GABA into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a GABA transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a GABA transporter and a genetic modification that reduces export of a GABA, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a GABA transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a GABA transporter. In some embodiments, the at least one native gene encoding a GABA transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a GABA transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native GABA transporter, as well as at least one copy of at least one heterologous gene encoding a GABA transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a GABA transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a GABA transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a GABA transporter, wherein said GABA transporter comprises a GABA sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the GABA sequence of a polypeptide encoded by a GABA transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a GABA transporter or functional variants of a GABA transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a GABA transporter relates to an element having qualitative biological activity in common with the wild-type GABA transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated GABA transporter is one which retains essentially the same ability to import GABA into the bacterial cell as does the GABA transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a GABA transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a GABA transporter. 
     In one embodiment, the genes encoding the GABA transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the GABA transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a GABA transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a GABA transporter is mutagenized; mutants exhibiting increased GABA import are selected; and the mutagenized at least one gene encoding a GABA transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a GABA transporter is mutagenized; mutants exhibiting decreased GABA import are selected; and the mutagenized at least one gene encoding a GABA transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a GABA transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a GABA transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a GABA transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a GABA transporter in nature. In some embodiments, the at least one gene encoding the GABA transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the GABA transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the GABA transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the GABA transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a GABA transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a GABA transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a GABA transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a GABA transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a GABA transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a GABA transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a GABA transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a GABA transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the GABA transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the GABA transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the GABA transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the GABA transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In one embodiment, the GABA transporter is the GABA transporter GabP, for example the  Escherichia coli  GabP. In one embodiment the GABA transporter is encoded by a amtB gene. In one embodiment, the gabP gene has at least about 80% identity with the sequence of SEQ ID NO:134. Accordingly, in one embodiment, the gabP gene has at least about 90% identity with the sequence of SEQ ID NO:134. Accordingly, in one embodiment, the gabP gene has at least about 95% identity with the sequence of SEQ ID NO:134. Accordingly, in one embodiment, the gabP gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:134. In another embodiment, the gabP gene comprises the sequence of SEQ ID NO:134. In yet another embodiment the gabP gene consists of the sequence of SEQ ID NO:134. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the GABA transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more GABA into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the GABA transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more GABA, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the GABA transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more GABA into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the GABA transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more GABA into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous GABA transporter and a second heterologous GABA transporter. In one embodiment, said first GABA transporter is derived from a different organism than said second GABA transporter. In some embodiments, said first GABA transporter is derived from the same organism as said second GABA transporter. In some embodiments, said first GABA transporter is a wild-type GABA transporter and said second GABA transporter is a mutagenized version of said first GABA transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous GABA transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous GABA transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous GABA transporters or more. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding an GABA transporter may be used to treat a disease, condition, and/or symptom associated with hyperammonenia. In some embodiment, the recombinant bacterial cells described herein can be used to treat hepatic encephalopathy. In some embodiment, the recombinant bacterial cells described herein can be used to treat Huntington&#39;s disease. In some embodiments, the invention provides methods for reducing, ameliorating, or eliminating one or more symptom(s) associated with hepatic encephalopathy and Huntington&#39;s disease. In some embodiments, the symptom(s) associated thereof include, but are not limited to, seizures, ataxia, stroke-like lesions, coma, psychosis, vision loss, acute encephalopathy, cerebral edema, as well as vomiting, respiratory alkalosis, and hypothermia. 
     J. Manganese Transporters 
     In biological systems, manganese (Mn 2+ ) is an essential trace metal and plays an important role in enzyme-mediated catalysis, but can also have deleterious effects. Manganese is a biologically important trace metal and is required for the survival of most living organisms. Cells maintain manganese under tight homeostatic control in order to avoid toxicity. In mammals, manganese is excreted in the bile, but its disposal is affected by the impaired flow of bile from the liver to the duodenum (i.e., cholestasis) that accompanies liver failure. Similar to ammonia, elevated concentrations of manganese play a role in the development of hepatic encephalopathy (Rivera-Manda et al. (2012)  Neurochem. Res.  37(5): 1074-1084). Astrocytes in the brain which detoxify ammonia in a reaction catalyzed by glutamine synthetase, require manganese as a cofactor and thus have a tendency to accumulate this metal (Aschner et al. (1999)  Neurotoxicology  20(2-3): 173-180). In vitro studies have demonstrated that manganese can result in the inhibition of glutamate transport (Hazell and Norenberg, 1997), abnormalities in astrocyte morphology (Hazell et al. (2006)  Neurosci. Lett.  396(3): 167-71), and increased cell volume (Rama Rao et al., 2007). Some disorders associated with hyperammonemia may also be characterized by elevated levels of manganese; manganese may contribute to disease pathogenesis (e.g., hepatic encephalopathy) (Rivera-Manda et al., 2012). Manganese and ammonia have also been shown to act synergistically in the pathogenesis of hepatic encephalopathy (Jayakumar et al. (2004)  Neurochem. Res.  29(11): 2051-6). 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a manganese transporter. In one embodiment, the manganese transporter transports manganese into the cell. 
     The uptake of manganese into bacterial cells is mediated by proteins well known to those of skill in the art. For example, the manganese transporter MntH is a membrane transport protein capable of transporting manganese into bacterial cells (see, e.g., Jensen and Jensen (2014) Chapter 1: Manganese transport, trafficking and function in invertebrates. In: Manganese in Health and Disease, pp. 1-33). In  Escherichia coli , the mntH gene encodes a proton-stimulated, divalent metal cation uptake system involved in manganese transport (Porcheron et al. (2013)  Front. Cell. Infect. Microbiol.  3: 90). In one embodiment, the manganese transporter is selected from the group consisting of mntH, MntABCD, SitABCD, PsaABCD, YfeABCD. In one embodiment, the at least one gene encoding a manganese transporter is encoded by an mntH gene. In one embodiment, the at least one gene encoding a manganese transporter is encoded by an MntABCD operon. In one embodiment, the at least one gene encoding a manganese transporter is encoded by an sitABCD operon. In one embodiment, the at least one gene encoding a manganese transporter is encoded by an PsaABCD operon. In one embodiment, the at least one gene encoding a manganese transporter is encoded by an YfeABCD operon. In one embodiment, the bacterial cell described herein has been genetically engineered to comprise at least one heterologous mntH gene. 
     Metal ion homeostasis in prokaryotic cells, which lack internal compartmentalization, is maintained by the tight regulation of metal ion flux across in cytoplasmic membrane (Jensen and Jensen, 2014). Manganese uptake in bacteria predominantly involves two major types of transporters: proton-dependent Nramprelated transporters, and/or ATP-dependent ABC transporters. The Nramp (Natural resistance-associated macrophage Qrotein) transporter family was first described in plants, animals, and yeasts (Cellier et al. (1996)  Trends Genet.  12(6): 201-4), but MntH has since been characterized in several bacterial species (Porcheron et al., 2013). Selectivity of the Nramp1 transporter for manganese has been shown in metal accumulation studies, wherein overexpression of  Staphylococcus aureus  mntH resulted in increased levels of cell-associated manganese, but no accumulation of calcium, copper, iron, magnesium, or zinc (Horsburgh et al. (2002)  Mol. Microbiol.  44(5): 1269-86). Additionally,  Bacillus subtilis  strains comprising a mutation in the mntH gene exhibited impaired growth in metal-free medium that was rescued by the addition of manganese (Que and Heimann (2000)  Mol. Microbiol.  35(6): 1454-68). 
     High-affinity manganese uptake may also be mediated by ABC (ATP-binding cassette) transporters. Members of this transporter superfamily utilize the hydrolysis of ATP to fuel the import or export of diverse substrates, ranging from ions to macromolecules, and are well characterized for their role in multi-drug resistance in both prokaryotic and eukaryotic cells. Non-limiting examples of bacterial ABC transporters involved in manganese import include MntABCD ( Bacillus subtilis, Staphylococcus aureus ), SitABCD ( Salmonella typhimurium, Shigella flexneri ), PsaABCD ( Streptococcus pneumoniae ), and YfeABCD ( Yersinia pestis ) (Bearden and Perry (1999)  Mol. Microbiol.  32(2):403-14; Kehres et al. (2002)  J. Bacteriol.  184(12): 3159-66; McAllister et al. (2004)  Mol. Microbiol.  53(3): 889-901; Zhou et al. (1999)  Infect. Immun.  67(4): 1974-81). The MntABCD transporter complex consists of three subunits, wherein MntC and MntD are integral membrane proteins that comprise the permease subunit mediate cation transport, MntB is the ATPase, and MntA binds and delivers manganese to the permease submit. Other ABC transporter operons, such as sitABCD, psaABCD, and yfeABCD, exhibit similar subunit organization and function (Higgins, 1992; Rees et al. (2009)  Nat. Rev. Mol. Cell Biol.  10(3): 218-227). 
     In some embodiments, the manganese transporter is encoded by a manganese transporter gene derived from a bacterial genus or species, including but not limited to,  Bacillus , e.g.,  Bacillus subtilis, Staphylococcus , e.g.,  Staphylococcus aureus, Salmonella , e.g.,  Salmonella typhimurium, Shigella , e.g.,  Shigella flexneri, Yersinia , e.g.,  Yersinia pestis , or  Escherichia , e.g.,  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a manganese transporter, a functional variant of a manganese transporter, or a functional fragment of transporter of manganese are well known to one of ordinary skill in the art. 
     Manganese transporters may be expressed or modified in the bacteria in order to enhance manganese transport into the cell. Specifically, when the manganese transporter is expressed in the recombinant bacterial cells, the bacterial cells import more manganese into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a manganese transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a manganese transporter and a genetic modification that reduces export of a manganese, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a manganese transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a manganese transporter. In some embodiments, the at least one native gene encoding a manganese transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a manganese transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native manganese transporter, as well as at least one copy of at least one heterologous gene encoding a manganese transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a manganese transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a manganese transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a manganese transporter, wherein said manganese transporter comprises a manganese sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the manganese sequence of a polypeptide encoded by a manganese transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a manganese transporter or functional variants of a manganese transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a manganese transporter relates to an element having qualitative biological activity in common with the wild-type manganese transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated manganese transporter is one which retains essentially the same ability to import manganese into the bacterial cell as does the manganese transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a manganese transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a manganese transporter. 
     In one embodiment, the genes encoding the manganese transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the manganese transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a manganese transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a manganese transporter is mutagenized; mutants exhibiting increased manganese import are selected; and the mutagenized at least one gene encoding a manganese transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a manganese transporter is mutagenized; mutants exhibiting decreased manganese import are selected; and the mutagenized at least one gene encoding a manganese transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a manganese transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a manganese transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a manganese transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a manganese transporter in nature. In some embodiments, the at least one gene encoding the manganese transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the manganese transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the manganese transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the manganese transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a manganese transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a manganese transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a manganese transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a manganese transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a manganese transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a manganese transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a manganese transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a manganese transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the manganese transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the manganese transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the manganese transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the manganese transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In one embodiment, the manganese transporter is the manganese transporter GabP, for example the  Escherichia coli  mntH gene. In one embodiment the manganese transporter is encoded by a mntH gene. In one embodiment, the mntH gene has at least about 80% identity with the sequence of SEQ ID NO:135. Accordingly, in one embodiment, the mntH gene has at least about 90% identity with the sequence of SEQ ID NO:135. Accordingly, in one embodiment, the mntH gene has at least about 95% identity with the sequence of SEQ ID NO:135. Accordingly, in one embodiment, the mntH gene has at least about 70%, 75%, 80%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity with the sequence of SEQ ID NO:135. In another embodiment, the mntH gene comprises the sequence of SEQ ID NO:135. In yet another embodiment the mntH gene consists of the sequence of SEQ ID NO:135. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the manganese transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more manganese into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the manganese transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more manganese, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the manganese transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more manganese into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the manganese transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more manganese into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous manganese transporter and a second heterologous manganese transporter. In one embodiment, said first manganese transporter is derived from a different organism than said second manganese transporter. In some embodiments, said first manganese transporter is derived from the same organism as said second manganese transporter. In some embodiments, said first manganese transporter is a wild-type manganese transporter and said second manganese transporter is a mutagenized version of said first manganese transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous manganese transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous manganese transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous manganese transporters or more. 
     In some embodiment, the recombinant bacterial cell comprising a heterologous gene encoding an manganese transporter may be used to treat a disease, condition, and/or symptom associated with hyperammonenia. In some embodiment, the recombinant bacterial cells described herein can be used to treat hepatic encephalopathy. In some embodiment, the recombinant bacterial cells described herein can be used to treat Huntington&#39;s disease. In some embodiments, the invention provides methods for reducing, ameliorating, or eliminating one or more symptom(s) associated with hepatic encephalopathy and Huntington&#39;s disease. In some embodiments, the symptom(s) associated thereof include, but are not limited to, seizures, ataxia, stroke-like lesions, coma, psychosis, vision loss, acute encephalopathy, cerebral edema, as well as vomiting, respiratory alkalosis, and hypothermia. 
     K. Toxin Transporters 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a toxin transporter. In one embodiment, the toxin transporter transports toxin into the cell. 
     In some embodiments, the toxin transporter is encoded by a toxin transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Corynebacterium, Escherichia coli, Saccharomyces cerevisiae  or  Corynebacterium glutamicum . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a toxin transporter, a functional variant of a toxin transporter, or a functional fragment of transporter of toxin are well known to one of ordinary skill in the art. 
     Toxin transporters may be expressed or modified in the bacteria in order to enhance toxin transport into the cell. Specifically, when the toxin transporter is expressed in the recombinant bacterial cells, the bacterial cells import more toxin into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a toxin transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a toxin transporter and a genetic modification that reduces export of a toxin, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a toxin transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a toxin transporter. In some embodiments, the at least one native gene encoding a toxin transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a toxin transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native toxin transporter, as well as at least one copy of at least one heterologous gene encoding a toxin transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a toxin transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a toxin transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a toxin transporter, wherein said toxin transporter comprises a toxin sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the toxin sequence of a polypeptide encoded by a toxin transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a toxin transporter or functional variants of a toxin transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a toxin transporter relates to an element having qualitative biological activity in common with the wild-type toxin transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated toxin transporter is one which retains essentially the same ability to import toxin into the bacterial cell as does the toxin transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a toxin transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a toxin transporter. 
     In one embodiment, the genes encoding the toxin transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the toxin transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a toxin transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a toxin transporter is mutagenized; mutants exhibiting increased toxin import are selected; and the mutagenized at least one gene encoding a toxin transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a toxin transporter is mutagenized; mutants exhibiting decreased toxin import are selected; and the mutagenized at least one gene encoding a toxin transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a toxin transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a toxin transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a toxin transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a toxin transporter in nature. In some embodiments, the at least one gene encoding the toxin transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the toxin transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the toxin transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the toxin transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a toxin transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a toxin transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a toxin transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a toxin transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a toxin transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a toxin transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a toxin transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a toxin transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the toxin transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the toxin transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the toxin transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the toxin transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the toxin transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more toxin into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the toxin transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more PGE2, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the toxin transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more toxin into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the toxin transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more toxin into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous toxin transporter and a second heterologous toxin transporter. In one embodiment, said first toxin transporter is derived from a different organism than said second toxin transporter. In some embodiments, said first toxin transporter is derived from the same organism as said second toxin transporter. In some embodiments, said first toxin transporter imports the same toxin as said second toxin transporter. In other embodiment, said first toxin transporter imports a different toxin from said second toxin transporter. In some embodiments, said first toxin transporter is a wild-type toxin transporter and said second toxin transporter is a mutagenized version of said first toxin transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous toxin transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous toxin transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous toxin transporters or more. 
     L. Peptide Transporters 
     In one embodiment, the recombinant bacterial cell of the invention comprises a heterologous gene encoding a substrate transporter, wherein the substrate transporter is a peptide transporter. 
     In some embodiments, the peptide transporter is encoded by a peptide transporter gene derived from a bacterial genus or species, including but not limited to,  Escherichia, Corynebacterium, Escherichia coli, Saccharomyces cerevisiae  or  Corynebacterium glutamicum . In some embodiments, the bacterial species is  Escherichia coli . In some embodiments, the bacterial species is  Escherichia coli  strain Nissle. 
     Assays for testing the activity of a peptide transporter, a functional variant of a peptide transporter, or a functional fragment of transporter of peptide are well known to one of ordinary skill in the art. 
     Peptide transporters may be expressed or modified in the bacteria in order to enhance peptide transport into the cell. Specifically, when the peptide transporter is expressed in the recombinant bacterial cells, the bacterial cells import more peptide into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In one embodiment, the bacterial cell comprises a heterologous gene encoding a peptide transporter. In one embodiment, the bacterial cell comprises a heterologous gene encoding a peptide transporter and a genetic modification that reduces export of a peptide, e.g., a genetic mutation in an exporter gene or promoter. 
     In one embodiment, the bacterial cell comprises at least one gene encoding a peptide transporter from a different organism, e.g., a different species of bacteria. In one embodiment, the bacterial cell comprises at least one native gene encoding a peptide transporter. In some embodiments, the at least one native gene encoding a peptide transporter is not modified. In another embodiment, the bacterial cell comprises more than one copy of at least one native gene encoding a peptide transporter. In yet another embodiment, the bacterial cell comprises a copy of at least one gene encoding a native peptide transporter, as well as at least one copy of at least one heterologous gene encoding a peptide transporter from a different bacterial species. In one embodiment, the bacterial cell comprises at least one, two, three, four, five, or six copies of the at least one heterologous gene encoding a peptide transporter. In one embodiment, the bacterial cell comprises multiple copies of the at least one heterologous gene encoding a peptide transporter. 
     In one embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a peptide transporter, wherein said peptide transporter comprises a peptide sequence that has at least 70%, 75%, 80%, 81%, 82%, 83% 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identity to the peptide sequence of a polypeptide encoded by a peptide transporter gene disclosed herein. 
     The present disclosure further comprises genes encoding functional fragments of a peptide transporter or functional variants of a peptide transporter. As used herein, the term “functional fragment thereof” or “functional variant thereof” of a peptide transporter relates to an element having qualitative biological activity in common with the wild-type peptide transporter from which the fragment or variant was derived. For example, a functional fragment or a functional variant of a mutated peptide transporter is one which retains essentially the same ability to import peptide into the bacterial cell as does the peptide transporter protein from which the functional fragment or functional variant was derived. In one embodiment, the recombinant bacterial cell comprises at least one heterologous gene encoding a functional fragment of a peptide transporter. In another embodiment, the recombinant bacterial cell comprises a heterologous gene encoding a functional variant of a peptide transporter. 
     In one embodiment, the genes encoding the peptide transporter have been codon-optimized for use in the host organism, e.g., a bacterial cell disclosed herein. In one embodiment, the genes encoding the peptide transporter have been codon-optimized for use in  Escherichia coli.    
     The present disclosure also encompasses genes encoding a peptide transporter comprising amino acids in its sequence that are substantially the same as an amino acid sequence described herein. Amino acid sequences that are substantially the same as the sequences described herein include sequences comprising conservative amino acid substitutions, as well as amino acid deletions and/or insertions. 
     In some embodiments, the at least one gene encoding a peptide transporter is mutagenized; mutants exhibiting increased peptide import are selected; and the mutagenized at least one gene encoding a peptide transporter is isolated and inserted into the bacterial cell. In some embodiments, the at least one gene encoding a peptide transporter is mutagenized; mutants exhibiting decreased peptide import are selected; and the mutagenized at least one gene encoding a peptide transporter is isolated and inserted into the bacterial cell. The transporter modifications described herein may be present on a plasmid or chromosome. 
     In some embodiments, the bacterial cell comprises a heterologous gene encoding a peptide transporter operably linked to a promoter. In one embodiment, the at least one gene encoding a peptide transporter is directly operably linked to the promoter. In another embodiment, the at least one gene encoding a peptide transporter is indirectly operably linked to the promoter. 
     In one embodiment, the promoter is not operably linked with the at least one gene encoding a peptide transporter in nature. In some embodiments, the at least one gene encoding the peptide transporter is controlled by its native promoter. In some embodiments, the at least one gene encoding the peptide transporter is controlled by an inducible promoter. In some embodiments, the at least one gene encoding the peptide transporter is controlled by a promoter that is stronger than its native promoter. In some embodiments, the at least one gene encoding the peptide transporter is controlled by a constitutive promoter. 
     In another embodiment, the promoter is an inducible promoter. Inducible promoters are described in more detail infra. 
     In one embodiment, the at least one gene encoding a peptide transporter is located on a plasmid in the bacterial cell. In some embodiments, the plasmid is a high copy number plasmid. In some embodiments, the plasmid is a low copy number plasmid. In another embodiment, the at least one gene encoding a peptide transporter is located in the chromosome of the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a peptide transporter is located in the chromosome of the bacterial cell, and a copy of at least one gene encoding a peptide transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a peptide transporter is located on a plasmid in the bacterial cell, and a copy of at least one gene encoding a peptide transporter from a different species of bacteria is located on a plasmid in the bacterial cell. In yet another embodiment, a native copy of the at least one gene encoding a peptide transporter is located in the chromosome of the bacterial cell, and a copy of the at least one gene encoding a peptide transporter from a different species of bacteria is located in the chromosome of the bacterial cell. 
     In some embodiments, the at least one native gene encoding the peptide transporter in the recombinant bacterial cell is not modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. In some embodiments, the at least one native gene encoding the peptide transporter in the recombinant bacterial cell is modified, and one or more additional copies of the native transporter are inserted into the genome. In alternate embodiments, the at least one native gene encoding the transporter is modified, and one or more additional copies of the transporter from a different bacterial species is inserted into the genome of the recombinant bacterial cell. 
     In some embodiments, at least one native gene encoding the peptide transporter in the bacterial cell is not modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. In some embodiments, at least one native gene encoding the peptide transporter in the bacterial cell is modified, and one or more additional copies of at least one native gene encoding the transporter are present in the bacterial cell on a plasmid. In alternate embodiments, the at least one native gene encoding the transporter is modified, and a copy of at least one gene encoding the transporter from a different bacterial species is present in the bacteria on a plasmid. 
     In some embodiments, the bacterium is  E. coli  Nissle, and the at least one native gene encoding the transporter in  E. coli  Nissle is not modified; one or more additional copies at least one native gene encoding the transporter from  E. coli  Nissle is inserted into the  E. coli  Nissle genome. In an alternate embodiment, the at least one native gene encoding the transporter in  E. coli  Nissle is not modified, and a copy of at least one gene encoding the transporter from a different bacterial species is inserted into the  E. coli  Nissle genome. 
     In one embodiment, when the peptide transporter is expressed in the recombinant bacterial cells, the bacterial cells import 10% more peptide into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In another embodiment, when the peptide transporter is expressed in the recombinant bacterial cells, the bacterial cells import 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% more PGE2, into the bacterial cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the peptide transporter is expressed in the recombinant bacterial cells, the bacterial cells import two-fold more peptide into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. In yet another embodiment, when the peptide transporter is expressed in the recombinant bacterial cells, the bacterial cells import three-fold, four-fold, five-fold, six-fold, seven-fold, eight-fold, nine-fold, ten-fold, fifteen-fold, twenty-fold, thirty-fold, fourty-fold, or fifty-fold more peptide into the cell when the transporter is expressed than unmodified bacteria of the same bacterial subtype under the same conditions. 
     In one embodiment, the recombinant bacterial cells described herein comprise a first heterologous peptide transporter and a second heterologous peptide transporter. In one embodiment, said first peptide transporter is derived from a different organism than said second peptide transporter. In some embodiments, said first peptide transporter is derived from the same organism as said second peptide transporter. In some embodiments, said first peptide transporter imports the same peptide as said second peptide transporter. In other embodiment, said first peptide transporter imports a different peptide from said second peptide transporter. In some embodiments, said first peptide transporter is a wild-type peptide transporter and said second peptide transporter is a mutagenized version of said first peptide transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least a third heterologous peptide transporter. In some embodiments, the recombinant bacterial cells described herein comprise at least four heterologous peptide transporters. In some embodiments, the recombinant bacterial cells described herein comprise at least five heterologous peptide transporters or more. 
     Inducible Promoters 
     In some embodiments, the bacterial cell comprises a stably maintained plasmid or chromosome carrying the gene(s) encoding the tranporter(s), such that the tranporter(s) can be expressed in the host cell, and the host cell is capable of survival and/or growth in vitro, e.g., in medium, and/or in vivo, e.g., in the gut. In some embodiments, bacterial cell comprises two or more distinct tranporters or operons, e.g., two or more tranporter genes. In some embodiments, bacterial cell comprises three or more distinct transporters or operons, e.g., three or more tranporter genes. In some embodiments, bacterial cell comprises 4, 5, 6, 7, 8, 9, 10, or more distinct tranporters or operons, e.g., 4, 5, 6, 7, 8, 9, 10, or more tranporter genes. 
     In some embodiments, the genetically engineered bacteria comprise multiple copies of the same tranporter gene(s). In some embodiments, the gene encoding the tranporter is present on a plasmid and operably linked to a directly or indirectly inducible promoter. In some embodiments, the gene encoding the tranporter is present on a plasmid and operably linked to a promoter that is induced under low-oxygen or anaerobic conditions. In some embodiments, the gene encoding the tranporter is present on a chromosome and operably linked to a directly or indirectly inducible promoter. In some embodiments, the gene encoding the tranporter is present in the chromosome and operably linked to a promoter that is induced under low-oxygen or anaerobic conditions. In some embodiments, the gene encoding the tranporter is present on a plasmid and operably linked to a promoter that is induced by exposure to tetracycline or arabinose. 
     In some embodiments, the promoter that is operably linked to the gene encoding the tranporter is directly induced by exogenous environmental conditions. In some embodiments, the promoter that is operably linked to the gene encoding the tranporter is indirectly induced by exogenous environmental conditions. In some embodiments, the promoter is directly or indirectly induced by exogenous environmental conditions specific to the gut of a mammal. In some embodiments, the promoter is directly or indirectly induced by exogenous environmental conditions specific to the small intestine of a mammal. In some embodiments, the promoter is directly or indirectly induced by low-oxygen or anaerobic conditions such as the environment of the mammalian gut. In some embodiments, the promoter is directly or indirectly induced by molecules or metabolites that are specific to the gut of a mammal. In some embodiments, the promoter is directly or indirectly induced by a molecule that is co-administered with the bacterial cell. 
     In certain embodiments, the bacterial cell comprises a gene encoding an tranporter expressed under the control of a fumarate and nitrate reductase regulator (FNR) responsive promoter. In  E. coli , FNR is a major transcriptional activator that controls the switch from aerobic to anaerobic metabolism (Unden et al., 1997). In the anaerobic state, FNR dimerizes into an active DNA binding protein that activates hundreds of genes responsible for adapting to anaerobic growth. In the aerobic state, FNR is prevented from dimerizing by oxygen and is inactive. FNR responsive promoters include, but are not limited to, the FNR responsive promoters listed in the chart, below. Underlined sequences are predicted ribosome binding sites, and bolded sequences are restriction sites used for cloning. 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 FNR 
                   
               
               
                   
                 Responsive 
                   
               
               
                   
                 Promoter 
                 Sequence 
               
               
                   
                   
               
             
            
               
                   
                 SEQ ID 
                 GTCAGCATAACACCCTGACCTCTCATTAATTGTTCA 
               
               
                   
                 NO: 
                 TGCCGGGCGGCACTATCGTCGTCCGGCCTTTTCCTC 
               
               
                   
                   
                 TCTTACTCTGCTACGTACATCTATTTCTATAAATCC 
               
               
                   
                   
                 GTTCAATTTGTCTGTTTTTTGCACAAACATGAAATA 
               
               
                   
                   
                 TCAGACAATTCCGTGACTTAAGAAAATTTATACAAA 
               
               
                   
                   
                 TCAGCAATATACCCCTTAAGGAGTATATAAAGGTGA 
               
               
                   
                   
                 ATTTGATTTACATCAATAAGCGGGGTTGCTGAATCG 
               
               
                   
                   
                 TTAAGGTAGGCGGTAATAG AAAAGAAATCGAGGCAA   
               
               
                   
                   
                 
                   AA 
                 
               
               
                   
                   
               
               
                   
                 SEQ ID 
                 ATTTCCTCTCATCCCATCCGGGGTGAGAGTCTTTTC 
               
               
                   
                 NO: 
                 CCCCGACTTATGGCTCATGCATGCATCAAAAAAGAT 
               
               
                   
                   
                 GTGAGCTTGATCAAAAACAAAAAATATTTCACTCGA 
               
               
                   
                   
                 CAGGAGTATTTATATTGCGCCCGTTACGTGGGCTTC 
               
               
                   
                   
                 GACTGTAAATC AGAAAGGAGAAAACACCT   
               
               
                   
                   
               
               
                   
                 SEQ ID 
                 GTCAGCATAACACCCTGACCTCTCATTAATTGTTCA 
               
               
                   
                 NO: 
                 TGCCGGGCGGCACTATCGTCGTCCGGCCTTTTCCTC 
               
               
                   
                   
                 TCTTACTCTGCTACGTACATCTATTTCTATAAATCC 
               
               
                   
                   
                 GTTCAATTTGTCTGTTTTTTGCACAAACATGAAATA 
               
               
                   
                   
                 TCAGACAATTCCGTGACTTAAGAAAATTTATACAAA 
               
               
                   
                   
                 TCAGCAATATACCCCTTAAGGAGTATATAAAGGTGA 
               
               
                   
                   
                 ATTTGATTTACATCAATAAGCGGGGTTGCTGAATCG 
               
               
                   
                   
                 TTAA GGATCC   CTCTAGAAATAATTTTGTTTAACTTT   
               
               
                   
                   
                 
                   AAGAAGGAGATATACAT 
                 
               
               
                   
                   
               
               
                   
                 SEQ ID 
                 CATTTCCTCTCATCCCATCCGGGGTGAGAGTCTTTT 
               
               
                   
                 NO: 
                 CCCCCGACTTATGGCTCATGCATGCATCAAAAAAGA 
               
               
                   
                   
                 TGTGAGCTTGATCAAAAACAAAAAATATTTCACTCG 
               
               
                   
                   
                 ACAGGAGTATTTATATTGCGCCC GGATCC   CTCTAGA   
               
               
                   
                   
                 AATAATTTTGTTTAACTTTAAGAAGGAGATATACAT 
               
               
                   
                   
               
               
                   
                 SEQ ID 
                 AGTTGTTCTTATTGGTGGTGTTGCTTTATGGTTGCA 
               
               
                   
                 NO: 
                 TCGTAGTAAATGGTTGTAACAAAAGCAATTTTTCCG 
               
               
                   
                   
                 GCTGTCTGTATACAAAAACGCCGTAAAGTTTGAGCG 
               
               
                   
                   
                 AAGTCAATAAACTCTCTACCCATTCAGGGCAATATC 
               
               
                   
                   
                 TCTCTT GGATCC   CTCTAGAAATAATTTTGTTTAACT   
               
               
                   
                   
                 
                   TTAAGAAGGAGATATACAT 
                 
               
               
                   
                   
               
            
           
         
       
     
     In one embodiment, the FNR responsive promoter comprises SEQ ID NO:1. In another embodiment, the FNR responsive promoter comprises SEQ ID NO:2. In another embodiment, the FNR responsive promoter comprises SEQ ID NO:3. In another embodiment, the FNR responsive promoter comprises SEQ ID NO4. In yet another embodiment, the FNR responsive promoter comprises SEQ ID NO:5. 
     In some embodiments, multiple distinct FNR nucleic acid sequences are inserted in the genetically engineered bacteria. In alternate embodiments, the genetically engineered bacteria comprise a gene encoding an tranporter expressed under the control of an alternate oxygen level-dependent promoter, e.g., DNR (Trunk et al., 2010) or ANR (Ray et al., 1997). In these embodiments, expression of the tranporter gene is particularly activated in a low-oxygen or anaerobic environment, such as in the gut. In some embodiments, gene expression is further optimized by methods known in the art, e.g., by optimizing ribosomal binding sites and/or increasing mRNA stability. In one embodiment, the mammalian gut is a human mammalian gut. 
     In some embodiments, the bacterial cell comprises an oxygen-level dependent transcriptional regulator, e.g., FNR, ANR, or DNR, and corresponding promoter from a different bacterial species. The heterologous oxygen-level dependent transcriptional regulator and promoter increase the transcription of genes operably linked to said promoter, e.g., the gene encoding the tranporter, in a low-oxygen or anaerobic environment, as compared to the native gene(s) and promoter in the bacteria under the same conditions. In certain embodiments, the non-native oxygen-level dependent transcriptional regulator is an FNR protein from  N. gonorrhoeae  (see, e.g., Isabella et al., 2011). In some embodiments, the corresponding wild-type transcriptional regulator is left intact and retains wild-type activity. In alternate embodiments, the corresponding wild-type transcriptional regulator is deleted or mutated to reduce or eliminate wild-type activity. 
     In some embodiments, the genetically engineered bacteria comprise a wild-type oxygen-level dependent transcriptional regulator, e.g., FNR, ANR, or DNR, and corresponding promoter that is mutated relative to the wild-type promoter from bacteria of the same subtype. The mutated promoter enhances binding to the wild-type transcriptional regulator and increases the transcription of genes operably linked to said promoter, e.g., the gene encoding the tranporter, in a low-oxygen or anaerobic environment, as compared to the wild-type promoter under the same conditions. In some embodiments, the genetically engineered bacteria comprise a wild-type oxygen-level dependent promoter, e.g., FNR, ANR, or DNR promoter, and corresponding transcriptional regulator that is mutated relative to the wild-type transcriptional regulator from bacteria of the same subtype. The mutated transcriptional regulator enhances binding to the wild-type promoter and increases the transcription of genes operably linked to said promoter, e.g., the gene encoding the tranporter, in a low-oxygen or anaerobic environment, as compared to the wild-type transcriptional regulator under the same conditions. In certain embodiments, the mutant oxygen-level dependent transcriptional regulator is an FNR protein comprising amino acid substitutions that enhance dimerization and FNR activity (see, e.g., Moore et al., (2006). 
     In some embodiments, the bacterial cells comprise multiple copies of the endogenous gene encoding the oxygen level-sensing transcriptional regulator, e.g., the FNR gene. In some embodiments, the gene encoding the oxygen level-sensing transcriptional regulator is present on a plasmid. In some embodiments, the gene encoding the oxygen level-sensing transcriptional regulator and the gene encoding the tranporter are present on different plasmids. In some embodiments, the gene encoding the oxygen level-sensing transcriptional regulator and the gene encoding the tranporter are present on the same plasmid. In some embodiments, the gene encoding the oxygen level-sensing transcriptional regulator is present on a chromosome. In some embodiments, the gene encoding the oxygen level-sensing transcriptional regulator and the gene encoding the tranporter are present on different chromosomes. In some embodiments, the gene encoding the oxygen level-sensing transcriptional regulator and the gene encoding the tranporter are present on the same chromosome. In some instances, it may be advantageous to express the oxygen level-sensing transcriptional regulator under the control of an inducible promoter in order to enhance expression stability. In some embodiments, expression of the transcriptional regulator is controlled by a different promoter than the promoter that controls expression of the gene encoding the tranporter. In some embodiments, expression of the transcriptional regulator is controlled by the same promoter that controls expression of the tranporter. In some embodiments, the transcriptional regulator and the tranporter are divergently transcribed from a promoter region. 
     RNS-Dependent Regulation 
     In some embodiments, the genetically engineered bacteria or genetically engineered virus comprise a gene encoding an tranporter that is expressed under the control of an inducible promoter. In some embodiments, the genetically engineered bacterium or genetically engineered virus that expresses an tranporter under the control of a promoter that is activated by inflammatory conditions. In one embodiment, the gene for producing the tranporter is expressed under the control of an inflammatory-dependent promoter that is activated in inflammatory environments, e.g., a reactive nitrogen species or RNS promoter. 
     As used herein, “reactive nitrogen species” and “RNS” are used interchangeably to refer to highly active molecules, ions, and/or radicals derived from molecular nitrogen. RNS can cause deleterious cellular effects such as nitrosative stress. RNS includes, but is not limited to, nitric oxide (NO.), peroxynitrite or peroxynitrite anion (ONOO—), nitrogen dioxide (.NO2), dinitrogen trioxide (N2O3), peroxynitrous acid (ONOOH), and nitroperoxycarbonate (ONOOCO2-) (unpaired electrons denoted by .). Bacteria have evolved transcription factors that are capable of sensing RNS levels. Different RNS signaling pathways are triggered by different RNS levels and occur with different kinetics. 
     As used herein, “RNS-inducible regulatory region” refers to a nucleic acid sequence to which one or more RNS-sensing transcription factors is capable of binding, wherein the binding and/or activation of the corresponding transcription factor activates downstream gene expression; in the presence of RNS, the transcription factor binds to and/or activates the regulatory region. In some embodiments, the RNS-inducible regulatory region comprises a promoter sequence. In some embodiments, the transcription factor senses RNS and subsequently binds to the RNS-inducible regulatory region, thereby activating downstream gene expression. In alternate embodiments, the transcription factor is bound to the RNS-inducible regulatory region in the absence of RNS; in the presence of RNS, the transcription factor undergoes a conformational change, thereby activating downstream gene expression. The RNS-inducible regulatory region may be operatively linked to a gene or genes, e.g., an tranporter gene sequence(s), e.g., any of the tranporters described herein. For example, in the presence of RNS, a transcription factor senses RNS and activates a corresponding RNS-inducible regulatory region, thereby driving expression of an operatively linked gene sequence. Thus, RNS induces expression of the gene or gene sequences. 
     As used herein, “RNS-derepressible regulatory region” refers to a nucleic acid sequence to which one or more RNS-sensing transcription factors is capable of binding, wherein the binding of the corresponding transcription factor represses downstream gene expression; in the presence of RNS, the transcription factor does not bind to and does not repress the regulatory region. In some embodiments, the RNS-derepressible regulatory region comprises a promoter sequence. The RNS-derepressible regulatory region may be operatively linked to a gene or genes, e.g., an tranporter gene sequence(s). For example, in the presence of RNS, a transcription factor senses RNS and no longer binds to and/or represses the regulatory region, thereby derepressing an operatively linked gene sequence or gene cassette. Thus, RNS derepresses expression of the gene or genes. 
     As used herein, “RNS-repressible regulatory region” refers to a nucleic acid sequence to which one or more RNS-sensing transcription factors is capable of binding, wherein the binding of the corresponding transcription factor represses downstream gene expression; in the presence of RNS, the transcription factor binds to and represses the regulatory region. In some embodiments, the RNS-repressible regulatory region comprises a promoter sequence. In some embodiments, the transcription factor that senses RNS is capable of binding to a regulatory region that overlaps with part of the promoter sequence. In alternate embodiments, the transcription factor that senses RNS is capable of binding to a regulatory region that is upstream or downstream of the promoter sequence. The RNS-repressible regulatory region may be operatively linked to a gene sequence or gene cassette. For example, in the presence of RNS, a transcription factor senses RNS and binds to a corresponding RNS-repressible regulatory region, thereby blocking expression of an operatively linked gene sequence or gene sequences. Thus, RNS represses expression of the gene or gene sequences. 
     As used herein, a “RNS-responsive regulatory region” refers to a RNS-inducible regulatory region, a RNS-repressible regulatory region, and/or a RNS-derepressible regulatory region. In some embodiments, the RNS-responsive regulatory region comprises a promoter sequence. Each regulatory region is capable of binding at least one corresponding RNS-sensing transcription factor. Examples of transcription factors that sense RNS and their corresponding RNS-responsive genes, promoters, and/or regulatory regions include, but are not limited to, those shown in Table 3. 
     
       
         
           
               
            
               
                   
               
               
                 Examples of RNS-sensing transctiption 
               
               
                 factors and RNS-responsive genes 
               
            
           
           
               
               
               
            
               
                 RNS-sensing 
                 Primarily 
                   
               
               
                 transcription 
                 capable of 
                 Examples of responsive genes, 
               
               
                 factor: 
                 sensing: 
                 promoters, and/or regulatory regions: 
               
               
                   
               
               
                 NsrR 
                 NO 
                 norB, aniA, nsrR, hmpA, ytfE, ygbA, 
               
               
                   
                   
                 hcp, hcr, nrfA, aox 
               
               
                 NorR 
                 NO 
                 norVW, norR 
               
               
                 DNR 
                 NO 
                 norCB, nir, nor, nos 
               
               
                   
               
            
           
         
       
     
     In some embodiments, the genetically engineered bacteria of the invention comprise a tunable regulatory region that is directly or indirectly controlled by a transcription factor that is capable of sensing at least one reactive nitrogen species. The tunable regulatory region is operatively linked to a gene or genes capable of directly or indirectly driving the expression of an tranporter, thus controlling expression of the tranporter relative to RNS levels. For example, the tunable regulatory region is a RNS-inducible regulatory region, and the payload is an tranporter, such as any of the tranporters provided herein; when RNS is present, e.g., in an inflamed tissue, a RNS-sensing transcription factor binds to and/or activates the regulatory region and drives expression of the tranporter gene or genes. Subsequently, when inflammation is ameliorated, RNS levels are reduced, and production of the tranporter is decreased or eliminated. 
     In some embodiments, the tunable regulatory region is a RNS-inducible regulatory region; in the presence of RNS, a transcription factor senses RNS and activates the RNS-inducible regulatory region, thereby driving expression of an operatively linked gene or genes. In some embodiments, the transcription factor senses RNS and subsequently binds to the RNS-inducible regulatory region, thereby activating downstream gene expression. In alternate embodiments, the transcription factor is bound to the RNS-inducible regulatory region in the absence of RNS; when the transcription factor senses RNS, it undergoes a conformational change, thereby inducing downstream gene expression. 
     In some embodiments, the tunable regulatory region is a RNS-inducible regulatory region, and the transcription factor that senses RNS is NorR. NorR “is an NO-responsive transcriptional activator that regulates expression of the norVW genes encoding flavorubredoxin and an associated flavoprotein, which reduce NO to nitrous oxide” (Spiro 2006). The genetically engineered bacteria of the invention may comprise any suitable RNS-responsive regulatory region from a gene that is activated by NorR. Genes that are capable of being activated by NorR are known in the art (see, e.g., Spiro 2006; Vine et al., 2011; Karlinsey et al., 2012; Table 1). In certain embodiments, the genetically engineered bacteria of the invention comprise a RNS-inducible regulatory region from norVW that is operatively linked to a gene or genes, e.g., one or more tranporter gene sequence(s). In the presence of RNS, a NorR transcription factor senses RNS and activates to the norVW regulatory region, thereby driving expression of the operatively linked gene(s) and producing the tranporter. 
     In some embodiments, the tunable regulatory region is a RNS-inducible regulatory region, and the transcription factor that senses RNS is DNR. DNR (dissimilatory nitrate respiration regulator) “promotes the expression of the nir, the nor and the nos genes” in the presence of nitric oxide (Castiglione et al., 2009). The genetically engineered bacteria of the invention may comprise any suitable RNS-responsive regulatory region from a gene that is activated by DNR. Genes that are capable of being activated by DNR are known in the art (see, e.g., Castiglione et al., 2009; Giardina et al., 2008; Table 1). In certain embodiments, the genetically engineered bacteria of the invention comprise a RNS-inducible regulatory region from norCB that is operatively linked to a gene or gene cassette, e.g., a butyrogenic gene cassette. In the presence of RNS, a DNR transcription factor senses RNS and activates to the norCB regulatory region, thereby driving expression of the operatively linked gene or genes and producing one or more tranporters. In some embodiments, the DNR is  Pseudomonas aeruginosa  DNR. 
     In some embodiments, the tunable regulatory region is a RNS-derepressible regulatory region, and binding of a corresponding transcription factor represses downstream gene expression; in the presence of RNS, the transcription factor no longer binds to the regulatory region, thereby derepressing the operatively linked gene or gene cassette. 
     In some embodiments, the tunable regulatory region is a RNS-derepressible regulatory region, and the transcription factor that senses RNS is NsrR. NsrR is “an Rrf2-type transcriptional repressor [that] can sense NO and control the expression of genes responsible for NO metabolism” (Isabella et al., 2009). The genetically engineered bacteria of the invention may comprise any suitable RNS-responsive regulatory region from a gene that is repressed by NsrR. In some embodiments, the NsrR is  Neisseria gonorrhoeae  NsrR. Genes that are capable of being repressed by NsrR are known in the art (see, e.g., Isabella et al., 2009; Dunn et al., 2010; Table 1). In certain embodiments, the genetically engineered bacteria of the invention comprise a RNS-derepressible regulatory region from norB that is operatively linked to a gene or genes, e.g., an tranporter gene or genes. In the presence of RNS, an NsrR transcription factor senses RNS and no longer binds to the norB regulatory region, thereby derepressing the operatively linked an tranporter gene or genes and producing the encoding an tranporter(s). 
     In some embodiments, it is advantageous for the genetically engineered bacteria to express a RNS-sensing transcription factor that does not regulate the expression of a significant number of native genes in the bacteria. In some embodiments, the genetically engineered bacterium of the invention expresses a RNS-sensing transcription factor from a different species, strain, or substrain of bacteria, wherein the transcription factor does not bind to regulatory sequences in the genetically engineered bacterium of the invention. In some embodiments, the genetically engineered bacterium of the invention is  Escherichia coli , and the RNS-sensing transcription factor is NsrR, e.g., from is  Neisseria gonorrhoeae , wherein the  Escherichia coli  does not comprise binding sites for said NsrR. In some embodiments, the heterologous transcription factor minimizes or eliminates off-target effects on endogenous regulatory regions and genes in the genetically engineered bacteria. 
     In some embodiments, the tunable regulatory region is a RNS-repressible regulatory region, and binding of a corresponding transcription factor represses downstream gene expression; in the presence of RNS, the transcription factor senses RNS and binds to the RNS-repressible regulatory region, thereby repressing expression of the operatively linked gene or gene cassette. In some embodiments, the RNS-sensing transcription factor is capable of binding to a regulatory region that overlaps with part of the promoter sequence. In alternate embodiments, the RNS-sensing transcription factor is capable of binding to a regulatory region that is upstream or downstream of the promoter sequence. 
     In these embodiments, the genetically engineered bacteria may comprise a two repressor activation regulatory circuit, which is used to express an tranporter. The two repressor activation regulatory circuit comprises a first RNS-sensing repressor and a second repressor, which is operatively linked to a gene or gene cassette, e.g., encoding an tranporter. In one aspect of these embodiments, the RNS-sensing repressor inhibits transcription of the second repressor, which inhibits the transcription of the gene or gene cassette. Examples of second repressors useful in these embodiments include, but are not limited to, TetR, C1, and LexA. In the absence of binding by the first repressor (which occurs in the absence of RNS), the second repressor is transcribed, which represses expression of the gene or genes. In the presence of binding by the first repressor (which occurs in the presence of RNS), expression of the second repressor is repressed, and the gene or genes, e.g., an tranporter gene or genes is expressed. 
     A RNS-responsive transcription factor may induce, derepress, or repress gene expression depending upon the regulatory region sequence used in the genetically engineered bacteria. One or more types of RNS-sensing transcription factors and corresponding regulatory region sequences may be present in genetically engineered bacteria. In some embodiments, the genetically engineered bacteria comprise one type of RNS-sensing transcription factor, e.g., NsrR, and one corresponding regulatory region sequence, e.g., from norB. In some embodiments, the genetically engineered bacteria comprise one type of RNS-sensing transcription factor, e.g., NsrR, and two or more different corresponding regulatory region sequences, e.g., from norB and aniA. In some embodiments, the genetically engineered bacteria comprise two or more types of RNS-sensing transcription factors, e.g., NsrR and NorR, and two or more corresponding regulatory region sequences, e.g., from norB and norR, respectively. One RNS-responsive regulatory region may be capable of binding more than one transcription factor. In some embodiments, the genetically engineered bacteria comprise two or more types of RNS-sensing transcription factors and one corresponding regulatory region sequence. Nucleic acid sequences of several RNS-regulated regulatory regions are known in the art (see, e.g., Spiro 2006; Isabella et al., 2009; Dunn et al., 2010; Vine et al., 2011; Karlinsey et al., 2012). 
     In some embodiments, the genetically engineered bacteria of the invention comprise a gene encoding a RNS-sensing transcription factor, e.g., the nsrR gene, that is controlled by its native promoter, an inducible promoter, a promoter that is stronger than the native promoter, e.g., the GlnRS promoter or the P(Bla) promoter, or a constitutive promoter. In some instances, it may be advantageous to express the RNS-sensing transcription factor under the control of an inducible promoter in order to enhance expression stability. In some embodiments, expression of the RNS-sensing transcription factor is controlled by a different promoter than the promoter that controls expression of the therapeutic molecule. In some embodiments, expression of the RNS-sensing transcription factor is controlled by the same promoter that controls expression of the therapeutic molecule. In some embodiments, the RNS-sensing transcription factor and therapeutic molecule are divergently transcribed from a promoter region. 
     In some embodiments, the genetically engineered bacteria of the invention comprise a gene for a RNS-sensing transcription factor from a different species, strain, or substrain of bacteria. In some embodiments, the genetically engineered bacteria comprise a RNS-responsive regulatory region from a different species, strain, or substrain of bacteria. In some embodiments, the genetically engineered bacteria comprise a RNS-sensing transcription factor and corresponding RNS-responsive regulatory region from a different species, strain, or substrain of bacteria. The heterologous RNS-sensing transcription factor and regulatory region may increase the transcription of genes operatively linked to said regulatory region in the presence of RNS, as compared to the native transcription factor and regulatory region from bacteria of the same subtype under the same conditions. 
     In some embodiments, the genetically engineered bacteria comprise a RNS-sensing transcription factor, NsrR, and corresponding regulatory region, nsrR, from  Neisseria gonorrhoeae . In some embodiments, the native RNS-sensing transcription factor, e.g., NsrR, is left intact and retains wild-type activity. In alternate embodiments, the native RNS-sensing transcription factor, e.g., NsrR, is deleted or mutated to reduce or eliminate wild-type activity. 
     In some embodiments, the genetically engineered bacteria of the invention comprise multiple copies of the endogenous gene encoding the RNS-sensing transcription factor, e.g., the nsrR gene. In some embodiments, the gene encoding the RNS-sensing transcription factor is present on a plasmid. In some embodiments, the gene encoding the RNS-sensing transcription factor and the gene or gene cassette for producing the therapeutic molecule are present on different plasmids. In some embodiments, the gene encoding the RNS-sensing transcription factor and the gene or gene cassette for producing the therapeutic molecule are present on the same plasmid. In some embodiments, the gene encoding the RNS-sensing transcription factor is present on a chromosome. In some embodiments, the gene encoding the RNS-sensing transcription factor and the gene or gene cassette for producing the therapeutic molecule are present on different chromosomes. In some embodiments, the gene encoding the RNS-sensing transcription factor and the gene or gene cassette for producing the therapeutic molecule are present on the same chromosome. 
     In some embodiments, the genetically engineered bacteria comprise a wild-type gene encoding a RNS-sensing transcription factor, e.g., the NsrR gene, and a corresponding regulatory region, e.g., a norB regulatory region, that is mutated relative to the wild-type regulatory region from bacteria of the same subtype. The mutated regulatory region increases the expression of the tranporter in the presence of RNS, as compared to the wild-type regulatory region under the same conditions. In some embodiments, the genetically engineered bacteria comprise a wild-type RNS-responsive regulatory region, e.g., the norB regulatory region, and a corresponding transcription factor, e.g., NsrR, that is mutated relative to the wild-type transcription factor from bacteria of the same subtype. The mutant transcription factor increases the expression of the tranporter in the presence of RNS, as compared to the wild-type transcription factor under the same conditions. In some embodiments, both the RNS-sensing transcription factor and corresponding regulatory region are mutated relative to the wild-type sequences from bacteria of the same subtype in order to increase expression of the tranporter in the presence of RNS. 
     In some embodiments, the gene or gene cassette for producing the anti-inflammation and/or gut barrier function enhancer molecule is present on a plasmid and operably linked to a promoter that is induced by RNS. In some embodiments, expression is further optimized by methods known in the art, e.g., by optimizing ribosomal binding sites, manipulating transcriptional regulators, and/or increasing mRNA stability. 
     In some embodiments, any of the gene(s) of the present disclosure may be integrated into the bacterial chromosome at one or more integration sites. For example, one or more copies of one or more encoding an tranporter gene(s) may be integrated into the bacterial chromosome. Having multiple copies of the gene or gen(s) integrated into the chromosome allows for greater production of the tranporter(s) and also permits fine-tuning of the level of expression. Alternatively, different circuits described herein, such as any of the secretion or exporter circuits, in addition to the therapeutic gene(s) or gene cassette(s) could be integrated into the bacterial chromosome at one or more different integration sites to perform multiple different functions. 
     ROS-Dependent Regulation 
     In some embodiments, the genetically engineered bacteria or genetically engineered virus comprise a gene for producing an tranporter that is expressed under the control of an inducible promoter. In some embodiments, the genetically engineered bacterium or genetically engineered virus that expresses an tranporter under the control of a promoter that is activated by conditions of cellular damage. In one embodiment, the gene for producing the tranporter is expressed under the control of an cellular damaged-dependent promoter that is activated in environments in which there is cellular or tissue damage, e.g., a reactive oxygen species or ROS promoter. 
     As used herein, “reactive oxygen species” and “ROS” are used interchangeably to refer to highly active molecules, ions, and/or radicals derived from molecular oxygen. ROS can be produced as byproducts of aerobic respiration or metal-catalyzed oxidation and may cause deleterious cellular effects such as oxidative damage. ROS includes, but is not limited to, hydrogen peroxide (H 2 O 2 ), organic peroxide (ROOH), hydroxyl ion (OH—), hydroxyl radical (.OH), superoxide or superoxide anion (.O2-), singlet oxygen (1O2), ozone (O3), carbonate radical, peroxide or peroxyl radical (.O2-2), hypochlorous acid (HOCl), hypochlorite ion (OCl—), sodium hypochlorite (NaOCl), nitric oxide (NO.), and peroxynitrite or peroxynitrite anion (ONOO—) (unpaired electrons denoted by .). Bacteria have evolved transcription factors that are capable of sensing ROS levels. Different ROS signaling pathways are triggered by different ROS levels and occur with different kinetics (Marinho et al., 2014). 
     As used herein, “ROS-inducible regulatory region” refers to a nucleic acid sequence to which one or more ROS-sensing transcription factors is capable of binding, wherein the binding and/or activation of the corresponding transcription factor activates downstream gene expression; in the presence of ROS, the transcription factor binds to and/or activates the regulatory region. In some embodiments, the ROS-inducible regulatory region comprises a promoter sequence. In some embodiments, the transcription factor senses ROS and subsequently binds to the ROS-inducible regulatory region, thereby activating downstream gene expression. In alternate embodiments, the transcription factor is bound to the ROS-inducible regulatory region in the absence of ROS; in the presence of ROS, the transcription factor undergoes a conformational change, thereby activating downstream gene expression. The ROS-inducible regulatory region may be operatively linked to a gene sequence or gene sequence, e.g., a sequence or sequences encoding one or more tranporter(s). For example, in the presence of ROS, a transcription factor, e.g., OxyR, senses ROS and activates a corresponding ROS-inducible regulatory region, thereby driving expression of an operatively linked gene sequence or gene sequences. Thus, ROS induces expression of the gene or genes. 
     As used herein, “ROS-derepressible regulatory region” refers to a nucleic acid sequence to which one or more ROS-sensing transcription factors is capable of binding, wherein the binding of the corresponding transcription factor represses downstream gene expression; in the presence of ROS, the transcription factor does not bind to and does not repress the regulatory region. In some embodiments, the ROS-derepressible regulatory region comprises a promoter sequence. The ROS-derepressible regulatory region may be operatively linked to a gene or genes, e.g., one or more genes encoding one or more tranporter(s). For example, in the presence of ROS, a transcription factor, e.g., OhrR, senses ROS and no longer binds to and/or represses the regulatory region, thereby derepressing an operatively linked gene sequence or gene cassette. Thus, ROS derepresses expression of the gene or gene cassette. 
     As used herein, “ROS-repressible regulatory region” refers to a nucleic acid sequence to which one or more ROS-sensing transcription factors is capable of binding, wherein the binding of the corresponding transcription factor represses downstream gene expression; in the presence of ROS, the transcription factor binds to and represses the regulatory region. In some embodiments, the ROS-repressible regulatory region comprises a promoter sequence. In some embodiments, the transcription factor that senses ROS is capable of binding to a regulatory region that overlaps with part of the promoter sequence. In alternate embodiments, the transcription factor that senses ROS is capable of binding to a regulatory region that is upstream or downstream of the promoter sequence. The ROS-repressible regulatory region may be operatively linked to a gene sequence or gene sequences. For example, in the presence of ROS, a transcription factor, e.g., PerR, senses ROS and binds to a corresponding ROS-repressible regulatory region, thereby blocking expression of an operatively linked gene sequence or gene sequences. Thus, ROS represses expression of the gene or genes. 
     As used herein, a “ROS-responsive regulatory region” refers to a ROS-inducible regulatory region, a ROS-repressible regulatory region, and/or a ROS-derepressible regulatory region. In some embodiments, the ROS-responsive regulatory region comprises a promoter sequence. Each regulatory region is capable of binding at least one corresponding ROS-sensing transcription factor. Examples of transcription factors that sense ROS and their corresponding ROS-responsive genes, promoters, and/or regulatory regions include, but are not limited to, those shown in Table 4. 
     
       
         
           
               
            
               
                   
               
               
                 Examples of ROS-sensing transctiptional 
               
               
                 factors and ROS-responsive genes 
               
            
           
           
               
               
               
            
               
                 ROS-sensing 
                 Primarily 
                   
               
               
                 transcription 
                 capable of 
                 Examples of responsive genes, 
               
               
                 factor: 
                 sensing: 
                 promoters, and/or regulatory regions: 
               
               
                   
               
               
                 OxyR 
                 H 2 O 2   
                 ahpC; ahpF; dps; dsbG; fhuF; flu; fur; 
               
               
                   
                   
                 gor; grxA; hemH; katG; oxyS; sufA; 
               
               
                   
                   
                 sufB; sufC; sufD; sufE; sufS; trxC; uxuA; 
               
               
                   
                   
                 yaaA; yaeH; yaiA; ybjM; ydcH; ydeN; 
               
               
                   
                   
                 ygaQ; yljA; ytfK 
               
               
                 PerR 
                 H 2 O 2   
                 katA; ahpCF; mrgA; zoaA; fur; 
               
               
                   
                   
                 hemAXCDBL; srfA 
               
               
                 OhrR 
                 Organic 
                 ohrA 
               
               
                   
                 peroxides 
               
               
                   
                 NaOCl 
               
               
                 SoxR 
                 •O 2   −   
                 soxS 
               
               
                   
                 NO• 
               
               
                   
                 (also capable 
               
               
                   
                 of sensing 
               
               
                   
                 H 2 O 2 ) 
               
               
                 RosR 
                 H 2 O 2   
                 rbtT; tnp16a; rluC1; tnp5a; mscL; 
               
               
                   
                   
                 tnp2d; phoD; tnp15b; pstA; tnp5b; 
               
               
                   
                   
                 xylC; gabD1; rluC2; cgtS9; azlC; 
               
               
                   
                   
                 narKGHJI; rosR 
               
               
                   
               
            
           
         
       
     
     In some embodiments, the genetically engineered bacteria comprise a tunable regulatory region that is directly or indirectly controlled by a transcription factor that is capable of sensing at least one reactive oxygen species. The tunable regulatory region is operatively linked to a gene or gene cassette capable of directly or indirectly driving the expression of an tranporter, thus controlling expression of the tranporter relative to ROS levels. For example, the tunable regulatory region is a ROS-inducible regulatory region, and the molecule is an tranporter; when ROS is present, e.g., in an inflamed tissue, a ROS-sensing transcription factor binds to and/or activates the regulatory region and drives expression of the gene sequence for the tranporter, thereby producing the tranporter. Subsequently, when inflammation is ameliorated, ROS levels are reduced, and production of the tranporter is decreased or eliminated. 
     In some embodiments, the tunable regulatory region is a ROS-inducible regulatory region; in the presence of ROS, a transcription factor senses ROS and activates the ROS-inducible regulatory region, thereby driving expression of an operatively linked gene or gene cassette. In some embodiments, the transcription factor senses ROS and subsequently binds to the ROS-inducible regulatory region, thereby activating downstream gene expression. In alternate embodiments, the transcription factor is bound to the ROS-inducible regulatory region in the absence of ROS; when the transcription factor senses ROS, it undergoes a conformational change, thereby inducing downstream gene expression. 
     In some embodiments, the tunable regulatory region is a ROS-inducible regulatory region, and the transcription factor that senses ROS is OxyR. OxyR “functions primarily as a global regulator of the peroxide stress response” and is capable of regulating dozens of genes, e.g., “genes involved in H 2 O 2  detoxification (katE, ahpCF), heme biosynthesis (hemH), reductant supply (grxA, gor, trxC), thiol-disulfide isomerization (dsbG), Fe—S center repair (sufA-E, sufS), iron binding (yaaA), repression of iron import systems (fur)” and “OxyS, a small regulatory RNA” (Dubbs et al., 2012). The genetically engineered bacteria may comprise any suitable ROS-responsive regulatory region from a gene that is activated by OxyR. Genes that are capable of being activated by OxyR are known in the art (see, e.g., Zheng et al., 2001; Dubbs et al., 2012; Table 1). In certain embodiments, the genetically engineered bacteria of the invention comprise a ROS-inducible regulatory region from oxyS that is operatively linked to a gene, e.g., an tranporter gene. In the presence of ROS, e.g., H2O2, an OxyR transcription factor senses ROS and activates to the oxyS regulatory region, thereby driving expression of the operatively linked tranporter gene and producing the tranporter. In some embodiments, OxyR is encoded by an  E. coli  oxyR gene. In some embodiments, the oxyS regulatory region is an  E. coli  oxyS regulatory region. In some embodiments, the ROS-inducible regulatory region is selected from the regulatory region of katG, dps, and ahpC. 
     In alternate embodiments, the tunable regulatory region is a ROS-inducible regulatory region, and the corresponding transcription factor that senses ROS is SoxR. When SoxR is “activated by oxidation of its [2Fe-2S] cluster, it increases the synthesis of SoxS, which then activates its target gene expression” (Koo et al., 2003). “SoxR is known to respond primarily to superoxide and nitric oxide” (Koo et al., 2003), and is also capable of responding to H2O2. The genetically engineered bacteria of the invention may comprise any suitable ROS-responsive regulatory region from a gene that is activated by SoxR. Genes that are capable of being activated by SoxR are known in the art (see, e.g., Koo et al., 2003; Table 1). In certain embodiments, the genetically engineered bacteria of the invention comprise a ROS-inducible regulatory region from soxS that is operatively linked to a gene, e.g., an tranporter. In the presence of ROS, the SoxR transcription factor senses ROS and activates the soxS regulatory region, thereby driving expression of the operatively linked an tranporter gene and producing the an tranporter. 
     In some embodiments, the tunable regulatory region is a ROS-derepressible regulatory region, and binding of a corresponding transcription factor represses downstream gene expression; in the presence of ROS, the transcription factor no longer binds to the regulatory region, thereby derepressing the operatively linked gene or gene cassette. 
     In some embodiments, the tunable regulatory region is a ROS-derepressible regulatory region, and the transcription factor that senses ROS is OhrR. OhrR “binds to a pair of inverted repeat DNA sequences overlapping the ohrA promoter site and thereby represses the transcription event,” but oxidized OhrR is “unable to bind its DNA target” (Duarte et al., 2010). OhrR is a “transcriptional repressor [that] . . . senses both organic peroxides and NaOCl” (Dubbs et al., 2012) and is “weakly activated by H 2 O 2  but it shows much higher reactivity for organic hydroperoxides” (Duarte et al., 2010). The genetically engineered bacteria of the invention may comprise any suitable ROS-responsive regulatory region from a gene that is repressed by OhrR. Genes that are capable of being repressed by OhrR are known in the art (see, e.g., Dubbs et al., 2012; Table 1). In certain embodiments, the genetically engineered bacteria of the invention comprise a ROS-derepressible regulatory region from ohrA that is operatively linked to a gene or gene cassette, e.g., an tranporter gene. In the presence of ROS, e.g., NaOCl, an OhrR transcription factor senses ROS and no longer binds to the ohrA regulatory region, thereby derepressing the operatively linked tranporter gene and producing the an tranporter. 
     OhrR is a member of the MarR family of ROS-responsive regulators. “Most members of the MarR family are transcriptional repressors and often bind to the −10 or −35 region in the promoter causing a steric inhibition of RNA polymerase binding” (Bussmann et al., 2010). Other members of this family are known in the art and include, but are not limited to, OspR, MgrA, RosR, and SarZ. In some embodiments, the transcription factor that senses ROS is OspR, MgRA, RosR, and/or SarZ, and the genetically engineered bacteria of the invention comprises one or more corresponding regulatory region sequences from a gene that is repressed by OspR, MgRA, RosR, and/or SarZ. Genes that are capable of being repressed by OspR, MgRA, RosR, and/or SarZ are known in the art (see, e.g., Dubbs et al., 2012). 
     In some embodiments, the tunable regulatory region is a ROS-derepressible regulatory region, and the corresponding transcription factor that senses ROS is RosR. RosR is “a MarR-type transcriptional regulator” that binds to an “18-bp inverted repeat with the consensus sequence TTGTTGAYRYRTCAACWA” and is “reversibly inhibited by the oxidant H2O2” (Bussmann et al., 2010). RosR is capable of repressing numerous genes and putative genes, including but not limited to “a putative polyisoprenoid-binding protein (cg1322, gene upstream of and divergent from rosR), a sensory histidine kinase (cgtS9), a putative transcriptional regulator of the Crp/FNR family (cg3291), a protein of the glutathione S-transferase family (cg1426), two putative FMN reductases (cg1150 and cg1850), and four putative monooxygenases (cg0823, cg1848, cg2329, and cg3084)” (Bussmann et al., 2010). The genetically engineered bacteria of the invention may comprise any suitable ROS-responsive regulatory region from a gene that is repressed by RosR. Genes that are capable of being repressed by RosR are known in the art (see, e.g., Bussmann et al., 2010; Table 1). In certain embodiments, the genetically engineered bacteria of the invention comprise a ROS-derepressible regulatory region from cgtS9 that is operatively linked to a gene or gene cassette, e.g., an tranporter. In the presence of ROS, e.g., H2O2, a RosR transcription factor senses ROS and no longer binds to the cgtS9 regulatory region, thereby derepressing the operatively linked tranporter gene and producing the tranporter. 
     In some embodiments, it is advantageous for the genetically engineered bacteria to express a ROS-sensing transcription factor that does not regulate the expression of a significant number of native genes in the bacteria. In some embodiments, the genetically engineered bacterium of the invention expresses a ROS-sensing transcription factor from a different species, strain, or substrain of bacteria, wherein the transcription factor does not bind to regulatory sequences in the genetically engineered bacterium of the invention. In some embodiments, the genetically engineered bacterium of the invention is  Escherichia coli , and the ROS-sensing transcription factor is RosR, e.g., from  Corynebacterium glutamicum , wherein the  Escherichia coli  does not comprise binding sites for said RosR. In some embodiments, the heterologous transcription factor minimizes or eliminates off-target effects on endogenous regulatory regions and genes in the genetically engineered bacteria. 
     In some embodiments, the tunable regulatory region is a ROS-repressible regulatory region, and binding of a corresponding transcription factor represses downstream gene expression; in the presence of ROS, the transcription factor senses ROS and binds to the ROS-repressible regulatory region, thereby repressing expression of the operatively linked gene or gene cassette. In some embodiments, the ROS-sensing transcription factor is capable of binding to a regulatory region that overlaps with part of the promoter sequence. In alternate embodiments, the ROS-sensing transcription factor is capable of binding to a regulatory region that is upstream or downstream of the promoter sequence. 
     In some embodiments, the tunable regulatory region is a ROS-repressible regulatory region, and the transcription factor that senses ROS is PerR. In  Bacillus subtilis , PerR “when bound to DNA, represses the genes coding for proteins involved in the oxidative stress response (katA, ahpC, and mrgA), metal homeostasis (hemAXCDBL, fur, and zoaA) and its own synthesis (perR)” (Marinho et al., 2014). PerR is a “global regulator that responds primarily to H2O2” (Dubbs et al., 2012) and “interacts with DNA at the per box, a specific palindromic consensus sequence (TTATAATNATTATAA) residing within and near the promoter sequences of PerR-controlled genes” (Marinho et al., 2014). PerR is capable of binding a regulatory region that “overlaps part of the promoter or is immediately downstream from it” (Dubbs et al., 2012). The genetically engineered bacteria of the invention may comprise any suitable ROS-responsive regulatory region from a gene that is repressed by PerR. Genes that are capable of being repressed by PerR are known in the art (see, e.g., Dubbs et al., 2012; Table 1). 
     In these embodiments, the genetically engineered bacteria may comprise a two repressor activation regulatory circuit, which is used to express an tranporter. The two repressor activation regulatory circuit comprises a first ROS-sensing repressor, e.g., PerR, and a second repressor, e.g., TetR, which is operatively linked to a gene or gene cassette, e.g., an tranporter. In one aspect of these embodiments, the ROS-sensing repressor inhibits transcription of the second repressor, which inhibits the transcription of the gene or gene cassette. Examples of second repressors useful in these embodiments include, but are not limited to, TetR, Cl, and LexA. In some embodiments, the ROS-sensing repressor is PerR. In some embodiments, the second repressor is TetR. In this embodiment, a PerR-repressible regulatory region drives expression of TetR, and a TetR-repressible regulatory region drives expression of the gene or gene cassette, e.g., an tranporter. In the absence of PerR binding (which occurs in the absence of ROS), tetR is transcribed, and TetR represses expression of the gene or gene cassette, e.g., an tranporter. In the presence of PerR binding (which occurs in the presence of ROS), tetR expression is repressed, and the gene or gene cassette, e.g., an tranporter, is expressed. 
     A ROS-responsive transcription factor may induce, derepress, or repress gene expression depending upon the regulatory region sequence used in the genetically engineered bacteria. For example, although “OxyR is primarily thought of as a transcriptional activator under oxidizing conditions . . . . OxyR can function as either a repressor or activator under both oxidizing and reducing conditions” (Dubbs et al., 2012), and OxyR “has been shown to be a repressor of its own expression as well as that of fhuF (encoding a ferric ion reductase) and flu (encoding the antigen 43 outer membrane protein)” (Zheng et al., 2001). The genetically engineered bacteria of the invention may comprise any suitable ROS-responsive regulatory region from a gene that is repressed by OxyR. In some embodiments, OxyR is used in a two repressor activation regulatory circuit, as described above. Genes that are capable of being repressed by OxyR are known in the art (see, e.g., Zheng et al., 2001; Table 1). Or, for example, although RosR is capable of repressing a number of genes, it is also capable of activating certain genes, e.g., the narKGHJI operon. In some embodiments, the genetically engineered bacteria comprise any suitable ROS-responsive regulatory region from a gene that is activated by RosR. In addition, “PerR-mediated positive regulation has also been observed . . . and appears to involve PerR binding to distant upstream sites” (Dubbs et al., 2012). In some embodiments, the genetically engineered bacteria comprise any suitable ROS-responsive regulatory region from a gene that is activated by PerR. 
     One or more types of ROS-sensing transcription factors and corresponding regulatory region sequences may be present in genetically engineered bacteria. For example, “OhrR is found in both Gram-positive and Gram-negative bacteria and can coreside with either OxyR or PerR or both” (Dubbs et al., 2012). In some embodiments, the genetically engineered bacteria comprise one type of ROS-sensing transcription factor, e.g., OxyR, and one corresponding regulatory region sequence, e.g., from oxyS. In some embodiments, the genetically engineered bacteria comprise one type of ROS-sensing transcription factor, e.g., OxyR, and two or more different corresponding regulatory region sequences, e.g., from oxyS and katG. In some embodiments, the genetically engineered bacteria comprise two or more types of ROS-sensing transcription factors, e.g., OxyR and PerR, and two or more corresponding regulatory region sequences, e.g., from oxyS and katA, respectively. One ROS-responsive regulatory region may be capable of binding more than one transcription factor. In some embodiments, the genetically engineered bacteria comprise two or more types of ROS-sensing transcription factors and one corresponding regulatory region sequence. 
     Nucleic acid sequences of several exemplary OxyR-regulated regulatory regions are shown in Table 5. OxyR binding sites are underlined and bolded. In some embodiments, genetically engineered bacteria comprise a nucleic acid sequence that is at least about 80%, at least about 85%, at least about 90%, at least about 95%, or at least about 99% homologous to the DNA sequence of SEQ ID NO: 46, 47, 48, or 49, or a functional fragment thereof. 
     
       
         
           
               
            
               
                   
               
               
                 Nucleotide sequences of exemplary OxyR- 
               
               
                 regulated regulatory regions 
               
            
           
           
               
               
            
               
                 Regulatory 
                 012345678901234567890123456789 
               
               
                 sequence 
                 01234567890123456789 
               
               
                   
               
               
                 katG 
                 TGTGGCTTTTATGAAAATCACACAGTGATCACA 
               
               
                 (SEQ ID 
                 AATTTTAAACAGAGCACAAAATGCTGCCTCGAA 
               
               
                 NO:) 
                 ATGAGGGCGGGAAAATAAGGTTATCAGCCTTGT 
               
               
                   
                 TTTCTCCCTCATTACTTGAAGGATATGAAGCTA 
               
               
                   
                 AAACCCTTTTTTATAAAGCATTTGTCCGAATTC 
               
               
                   
                 GGACATAATCAAAAAAGCTTAATTAAGATCAAT 
               
               
                   
                 TTGATCTACATCTCTTTAACCAACAATAT   GTAA     
               
               
                   
                     GATCTCAACTATC   GCATC   CGTGGATTAATTCAA     
               
               
                   
                     TT   ATAACTTCTCTCTAACGCTGTGTATCGTAAC 
               
               
                   
                 GGTAACACTGTAGAGGGGAGCACATTGATGCGA 
               
               
                   
                 ATTCATTAAAGAGGAGAAAGGTACC 
               
               
                   
               
               
                 dps 
                 TTCCGAAAATTCCTGGCGAGCAGATAAATAAGA 
               
               
                 (SEQ ID 
                 ATTGTTCTTATCAATATATCTAACTCATTGAAT 
               
               
                 NO:) 
                 CTTTATTAGTTTTGTTTTTCA   CGCTTGTTACCA     
               
               
                   
                     CTATT   AGTGT   GATAGGAACAGCCAGAA   TAGCGG 
               
               
                   
                 AACACATAGCCGGTGCTATACTTAATCTCGTTA 
               
               
                   
                 ATTACTGGGACATAACATCAAGAGGATATGAAA 
               
               
                   
                 TTCGAATTCATTAAAGAGGAGAAAGGTACC 
               
               
                   
               
               
                 ahpC 
                 GCTTAGATCAGGTGATTGCCCTTTGTTTATGAG 
               
               
                 (SEQ ID 
                 GGTGTTGTAATCCATGTCGTTGTTGCATTTGTA 
               
               
                 NO:) 
                 AGGGCAACACCTCAGCCTGCAGGCAGGCACTGA 
               
               
                   
                 AGATACCAAAGGGTAGTTCAGATTACACGGTCA 
               
               
                   
                 CCTGGAAAGGGGGCCATTTTACTTTTTATCGCC 
               
               
                   
                 GCTGGCGGTGCAAAGTTCACAAAGTTGTCTTAC 
               
               
                   
                 GAAGGTT   GTAAGGTAAAACTTATC   GATTT   GATA     
               
               
                   
                     ATGGAAACGCATT   AGCCGAATCGGCAAAAATTG 
               
               
                   
                 GTTACCTTACATCTCATCGAAAACACGGAGGAA 
               
               
                   
                 GTATAGATGCGAATTCATTAAAGAGGAGAAAGG 
               
               
                   
                 TACC 
               
               
                   
               
               
                 oxyS 
                 CTCGAGTTCATTATCCATCCTCCATCGCCAC   GA     
               
               
                 (SEQ ID 
                     TAGTTCATGGCGATA   GGTAG   AATAGCAATGAAC     
               
               
                 NO:) 
                     GATT   ATCCCTATCAAGCATTCTGACTGATAATT 
               
               
                   
                 GCTCACACGAATTCATTAAAGAGGAGAAAGGTA 
               
               
                   
                 CC 
               
               
                   
               
            
           
         
       
     
     In some embodiments, the genetically engineered bacteria of the invention comprise a gene encoding a ROS-sensing transcription factor, e.g., the oxyR gene, that is controlled by its native promoter, an inducible promoter, a promoter that is stronger than the native promoter, e.g., the GlnRS promoter or the P(Bla) promoter, or a constitutive promoter. In some instances, it may be advantageous to express the ROS-sensing transcription factor under the control of an inducible promoter in order to enhance expression stability. In some embodiments, expression of the ROS-sensing transcription factor is controlled by a different promoter than the promoter that controls expression of the therapeutic molecule. In some embodiments, expression of the ROS-sensing transcription factor is controlled by the same promoter that controls expression of the therapeutic molecule. In some embodiments, the ROS-sensing transcription factor and therapeutic molecule are divergently transcribed from a promoter region. 
     In some embodiments, the genetically engineered bacteria of the invention comprise a gene for a ROS-sensing transcription factor from a different species, strain, or substrain of bacteria. In some embodiments, the genetically engineered bacteria comprise a ROS-responsive regulatory region from a different species, strain, or substrain of bacteria. In some embodiments, the genetically engineered bacteria comprise a ROS-sensing transcription factor and corresponding ROS-responsive regulatory region from a different species, strain, or substrain of bacteria. The heterologous ROS-sensing transcription factor and regulatory region may increase the transcription of genes operatively linked to said regulatory region in the presence of ROS, as compared to the native transcription factor and regulatory region from bacteria of the same subtype under the same conditions. 
     In some embodiments, the genetically engineered bacteria comprise a ROS-sensing transcription factor, OxyR, and corresponding regulatory region, oxyS, from  Escherichia coli . In some embodiments, the native ROS-sensing transcription factor, e.g., OxyR, is left intact and retains wild-type activity. In alternate embodiments, the native ROS-sensing transcription factor, e.g., OxyR, is deleted or mutated to reduce or eliminate wild-type activity. 
     In some embodiments, the genetically engineered bacteria of the invention comprise multiple copies of the endogenous gene encoding the ROS-sensing transcription factor, e.g., the oxyR gene. In some embodiments, the gene encoding the ROS-sensing transcription factor is present on a plasmid. In some embodiments, the gene encoding the ROS-sensing transcription factor and the gene or gene cassette for producing the therapeutic molecule are present on different plasmids. In some embodiments, the gene encoding the ROS-sensing transcription factor and the gene or gene cassette for producing the therapeutic molecule are present on the same. In some embodiments, the gene encoding the ROS-sensing transcription factor is present on a chromosome. In some embodiments, the gene encoding the ROS-sensing transcription factor and the gene or gene cassette for producing the therapeutic molecule are present on different chromosomes. In some embodiments, the gene encoding the ROS-sensing transcription factor and the gene or gene cassette for producing the therapeutic molecule are present on the same chromosome. 
     In some embodiments, the genetically engineered bacteria comprise a wild-type gene encoding a ROS-sensing transcription factor, e.g., the soxR gene, and a corresponding regulatory region, e.g., a soxS regulatory region, that is mutated relative to the wild-type regulatory region from bacteria of the same subtype. The mutated regulatory region increases the expression of the tranporter in the presence of ROS, as compared to the wild-type regulatory region under the same conditions. In some embodiments, the genetically engineered bacteria comprise a wild-type ROS-responsive regulatory region, e.g., the oxyS regulatory region, and a corresponding transcription factor, e.g., OxyR, that is mutated relative to the wild-type transcription factor from bacteria of the same subtype. The mutant transcription factor increases the expression of the tranporter in the presence of ROS, as compared to the wild-type transcription factor under the same conditions. In some embodiments, both the ROS-sensing transcription factor and corresponding regulatory region are mutated relative to the wild-type sequences from bacteria of the same subtype in order to increase expression of the tranporter in the presence of ROS. 
     In some embodiments, the gene or gene cassette for producing the tranporter is present on a plasmid and operably linked to a promoter that is induced by ROS. In some embodiments, the gene or gene cassette for producing the tranporter is present in the chromosome and operably linked to a promoter that is induced by ROS. In some embodiments, the gene or gene cassette for producing the tranporter is present on a chromosome and operably linked to a promoter that is induced by exposure to tetracycline. In some embodiments, the gene or gene cassette for producing the tranporter is present on a plasmid and operably linked to a promoter that is induced by exposure to tetracycline. In some embodiments, expression is further optimized by methods known in the art, e.g., by optimizing ribosomal binding sites, manipulating transcriptional regulators, and/or increasing mRNA stability. 
     In some embodiments, the genetically engineered bacteria may comprise multiple copies of the gene(s) capable of producing an tranporter(s). In some embodiments, the gene(s) capable of producing an tranporter(s) is present on a plasmid and operatively linked to a ROS-responsive regulatory region. In some embodiments, the gene(s) capable of producing an tranporter is present in a chromosome and operatively linked to a ROS-responsive regulatory region. 
     Thus, in some embodiments, the genetically engineered bacteria or genetically engineered virus produce one or more tranporters under the control of an oxygen level-dependent promoter, a reactive oxygen species (ROS)-dependent promoter, or a reactive nitrogen species (RNS)-dependent promoter, and a corresponding transcription factor. 
     In some embodiments, the genetically engineered bacteria comprise a stably maintained plasmid or chromosome carrying a gene for producing an tranporter, such that the tranporter can be expressed in the host cell, and the host cell is capable of survival and/or growth in vitro, e.g., in medium, and/or in vivo. In some embodiments, a bacterium may comprise multiple copies of the gene encoding the tranporter. In some embodiments, the gene encoding the tranporter is expressed on a low-copy plasmid. In some embodiments, the low-copy plasmid may be useful for increasing stability of expression. In some embodiments, the low-copy plasmid may be useful for decreasing leaky expression under non-inducing conditions. In some embodiments, the gene encoding the tranporter is expressed on a high-copy plasmid. In some embodiments, the high-copy plasmid may be useful for increasing expression of the tranporter. In some embodiments, the gene encoding the tranporter is expressed on a chromosome. 
     In some embodiments, the bacteria are genetically engineered to include multiple mechanisms of action (MOAs), e.g., circuits producing multiple copies of the same product (e.g., to enhance copy number) or circuits performing multiple different functions. For example, the genetically engineered bacteria may include four copies of the gene encoding a particular tranporter inserted at four different insertion sites. Alternatively, the genetically engineered bacteria may include three copies of the gene encoding a particular tranporter inserted at three different insertion sites and three copies of the gene encoding a different tranporter inserted at three different insertion sites. 
     In some embodiments, under conditions where the tranporter is expressed, the genetically engineered bacteria of the disclosure produce at least about 1.5-fold, at least about 2-fold, at least about 10-fold, at least about 15-fold, at least about 20-fold, at least about 30-fold, at least about 50-fold, at least about 100-fold, at least about 200-fold, at least about 300-fold, at least about 400-fold, at least about 500-fold, at least about 600-fold, at least about 700-fold, at least about 800-fold, at least about 900-fold, at least about 1,000-fold, or at least about 1,500-fold more of the tranporter, and/or transcript of the gene(s) in the operon as compared to unmodified bacteria of the same subtype under the same conditions. 
     In some embodiments, quantitative PCR (qPCR) is used to amplify, detect, and/or quantify mRNA expression levels of the tranporter gene(s). Primers specific for tranporter the gene(s) may be designed and used to detect mRNA in a sample according to methods known in the art. In some embodiments, a fluorophore is added to a sample reaction mixture that may contain tranporter mRNA, and a thermal cycler is used to illuminate the sample reaction mixture with a specific wavelength of light and detect the subsequent emission by the fluorophore. The reaction mixture is heated and cooled to predetermined temperatures for predetermined time periods. In certain embodiments, the heating and cooling is repeated for a predetermined number of cycles. In some embodiments, the reaction mixture is heated and cooled to 90-100° C., 60-70° C., and 30-50° C. for a predetermined number of cycles. Ina certain embodiment, the reaction mixture is heated and cooled to 93-97° C., 55-65° C., and 35-45° C. for a predetermined number of cycles. In some embodiments, the accumulating amplicon is quantified after each cycle of the qPCR. The number of cycles at which fluorescence exceeds the threshold is the threshold cycle (CT). At least one CT result for each sample is generated, and the CT result(s) may be used to determine mRNA expression levels of the tranporter gene(s). 
     In some embodiments, quantitative PCR (qPCR) is used to amplify, detect, and/or quantify mRNA expression levels of the tranporter gene(s). Primers specific for tranporter the gene(s) may be designed and used to detect mRNA in a sample according to methods known in the art. In some embodiments, a fluorophore is added to a sample reaction mixture that may contain tranporter mRNA, and a thermal cycler is used to illuminate the sample reaction mixture with a specific wavelength of light and detect the subsequent emission by the fluorophore. The reaction mixture is heated and cooled to predetermined temperatures for predetermined time periods. In certain embodiments, the heating and cooling is repeated for a predetermined number of cycles. In some embodiments, the reaction mixture is heated and cooled to 90-100° C., 60-70° C., and 30-50° C. for a predetermined number of cycles. Ina certain embodiment, the reaction mixture is heated and cooled to 93-97° C., 55-65° C., and 35-45° C. for a predetermined number of cycles. In some embodiments, the accumulating amplicon is quantified after each cycle of the qPCR. The number of cycles at which fluorescence exceeds the threshold is the threshold cycle (CT). At least one CT result for each sample is generated, and the CT result(s) may be used to determine mRNA expression levels of the tranporter gene(s). 
     Essential Genes and Auxotrophs 
     As used herein, the term “essential gene” refers to a gene that is necessary to for cell growth and/or survival. Bacterial essential genes are well known to one of ordinary skill in the art, and can be identified by directed deletion of genes and/or random mutagenesis and screening (see, for example, Zhang and Lin, 2009, DEG 5.0, a database of essential genes in both prokaryotes and eukaryotes,  Nucl. Acids Res.,  37:D455-D458 and Gerdes et al., Essential genes on metabolic maps,  Curr. Opin. Biotechnol.,  17(5):448-456, the entire contents of each of which are expressly incorporated herein by reference). 
     An “essential gene” may be dependent on the circumstances and environment in which an organism lives. For example, a mutation of, modification of, or excision of an essential gene may result in the recombinant bacteria of the disclosure becoming an auxotroph. An auxotrophic modification is intended to cause bacteria to die in the absence of an exogenously added nutrient essential for survival or growth because they lack the gene(s) necessary to produce that essential nutrient. 
     An auxotrophic modification is intended to cause bacteria to die in the absence of an exogenously added nutrient essential for survival or growth because they lack the gene(s) necessary to produce that essential nutrient. In some embodiments, any of the genetically engineered bacteria described herein also comprise a deletion or mutation in a gene required for cell survival and/or growth. In one embodiment, the essential gene is a DNA synthesis gene, for example, thyA. In another embodiment, the essential gene is a cell wall synthesis gene, for example, dapA. In yet another embodiment, the essential gene is an amino acid gene, for example, serA or MetA. Any gene required for cell survival and/or growth may be targeted, including but not limited to, cysE, ginA, ilvD, leuB, lysA, serA, metA, glyA, hisB, ilvA, pheA, proA, thrC, trpC, tyrA, thyA, uraA, dapA, dapB, dapD, dapE, dapF, flhD, metB, metC, proAB, and thil, as long as the corresponding wild-type gene product is not produced in the bacteria. For example, thymine is a nucleic acid that is required for bacterial cell growth; in its absence, bacteria undergo cell death. The thyA gene encodes thimidylate synthetase, an enzyme that catalyzes the first step in thymine synthesis by converting dUMP to dTMP (Sat et al. (2003)  J. Bacteriol . (2003) 185(6):1803-7). In some embodiments, the bacterial cell of the disclosure is a thyA auxotroph in which the thyA gene is deleted and/or replaced with an unrelated gene. A thyA auxotroph can grow only when sufficient amounts of thymine are present, e.g., by adding thymine to growth media in vitro. Without sufficient amounts of thymine, the thyA auxotroph dies. In some embodiments, the auxotrophic modification is used to ensure that the bacterial cell does not survive in the absence of the auxotrophic gene product, e.g., outside of the hypoxic tumor environment. 
     Diaminopimelic acid (DAP) is an amino acid synthetized within the lysine biosynthetic pathway and is required for bacterial cell wall growth (Meadow et al., 1959; Clarkson et al., 1971). In some embodiments, any of the genetically engineered bacteria described herein is a dapD auxotroph in which the dapD gene is deleted and/or replaced with an unrelated gene. A dapD auxotroph can grow only when sufficient amounts of DAP are present, e.g., by adding DAP to growth media in vitro. Without sufficient amounts of DAP, the dapD auxotroph dies. In some embodiments, the auxotrophic modification is used to ensure that the bacterial cell does not survive in the absence of the auxotrophic gene product. 
     In other embodiments, the genetically engineered bacterium of the present disclosure is a uraA auxotroph in which the uraA gene is deleted and/or replaced with an unrelated gene. The uraA gene codes for UraA, a membrane-bound transporter that facilitates the uptake and subsequent metabolism of the pyrimidine uracil (Andersen et al., 1995). A uraA auxotroph can grow only when sufficient amounts of uracil are present, e.g., by adding uracil to growth media in vitro. Without sufficient amounts of uracil, the uraA auxotroph dies. In some embodiments, auxotrophic modifications are used to ensure that the bacteria do not survive in the absence of the auxotrophic gene product. 
     In complex communities, it is possible for bacteria to share DNA. In very rare circumstances, an auxotrophic bacterial strain may receive DNA from a non-auxotrophic strain, which repairs the genomic deletion and permanently rescues the auxotroph. Therefore, engineering a bacterial strain with more than one auxotroph may greatly decrease the probability that DNA transfer will occur enough times to rescue the auxotrophy. In some embodiments, the genetically engineered bacteria of the invention comprise a deletion or mutation in two or more genes required for cell survival and/or growth. 
     Other examples of essential genes include, but are not limited to yhbV yagG, hemB, secD, secF, ribD, ribE, thiL, dxs, ispA, dnaX, adk, hemH, lpxH, cysS, fold, rplT, infC, thrS, nadE, gapA, yeaZ, aspS, argS, pgsA, yeM, metG, folE, yejM, gyrA, nrdA, nrdB, folC, accD, fabB, gltX, ligA, zipA, dapE, dapA, der, hisS, ispG, suhB, tadA, acpS, era, rnc, ftsB, eno, pyrG, chpR, lgt, jbaA, pgk, yqgD, metK, yqgF, plsC, ygiT, pare, ribB, cca, ygjD, tdcF, yraL, yihA, ftsN, mur, murB, birA, secE, nusG, rplJ, rplL, rpoB, rpoC, ubiA, plsB, lexA, dnaB, ssb, alsK, groS, psd, orn, yjeE, rpsR, chpS, ppa, valS, yjgP, yjgQ, dnaC, ribF, ispA, ispH, dapB, folA, imp, yabQ, ftsL, fts, murE, murF, mraY, murD, ftsW, murG, murC, ftsQ, ftsA, ftsZ, lpxC, secM, secA, can, folK, hemL, yadR, dapD, map, rpsB, inB, nusA, ftsH, obgE, rpmA, rplU, ispB, murA, yrbB, yrbK, yhbN, rps, rplM, degS, mreD, mreC, mreB, accB, accC, yrdC, def fmt, rplQ, rpoA, rpsD, rpsK, rpsM, entD, mrdB, mrdA, nadD, hlepB, rpoE, pssA, yfiO, rplS, trmD, rpsP, ffh, grpE, yfjB, csrA, ispF, ispD, rplW, rplD, rplC, rpsJ, fusA, rpsG, rpsL, trpS, yrJF, asd, rpoH, ftsX, ftsE, ftsY, frr, dxr, ispU, rfaK, kdtA, coaD, rpmB, dfp, dut, gmk, spot, gyrB, dnaN, dnaA, rpmH, rnpA, yidC, tnaB, glmS, glmU, wzyE, hemD, hemC, yigP, ubiB, ubiD, hemG, secY, rpO, rpmD, rpsE, rplR, rplF, rpsH, rpsN, rplE, rplX, rplN, rpsQ, rpmC, rplP, rpsC, rplV, rpsS, rplB, cdsA, yaeL, yaeT, lpxD, fabZ, lpxA, lpxB, dnaE, accA, tilS, proS, yafF, tsf, pyrH, olA, rlpB, leuS, nt, ginS, fldA, cydA, infA, cydC, ftsK, lolA, serS, rpsA, msbA, lpxK, kdsB, mukF, mukE, mukB, asnS,  fabA , mviN, rne, yceQ, fabD, fabG, acpP, tmk, holB, lolC, lolD, lolE, purB, ymjK, minE, mind, pth, rsA, ispE, lolB, hemA, prfA, prmC, kdsA, topA, ribA, fabl, racR, dicA, ydfB, tyrS, ribC, ydiL, pheT pheS, yhhQ, bcsB, glyQ, yibJ, and gpsA. Other essential genes are known to those of ordinary skill in the art. 
     In some embodiments, the genetically engineered bacterium of the present disclosure is a synthetic ligand-dependent essential gene (SLiDE) bacterial cell. SLiDE bacterial cells are synthetic auxotrophs with a mutation in one or more essential genes that only grow in the presence of a particular ligand (see Lopez and Anderson “Synthetic Auxotrophs with Ligand-Dependent Essential Genes for a BL21 (DE3 Biosafety Strain,” ACS Synthetic Biology (2015) DOI: 10.1021/acssynbio.5b00085, the entire contents of which are expressly incorporated herein by reference). 
     In some embodiments, the SLiDE bacterial cell comprises a mutation in an essential gene. In some embodiments, the essential gene is selected from the group consisting of pheS, dnaN, tyrS, metG, and adk. In some embodiments, the essential gene is dnaN comprising one or more of the following mutations: H191N, R240C, I317S, F319V, L340T, V347I, and S345C. In some embodiments, the essential gene is dnaN comprising the mutations H191N, R240C, I317S, F319V, L340T, V347I, and S345C. In some embodiments, the essential gene is pheS comprising one or more of the following mutations: F125G, P183T, P184A, R186A, and I188L. In some embodiments, the essential gene is pheS comprising the mutations F125G, P183T, P184A, R186A, and I188L. In some embodiments, the essential gene is tyrS comprising one or more of the following mutations: L36V, C38A, and F40G. In some embodiments, the essential gene is tyrS comprising the mutations L36V, C38A, and F40G. In some embodiments, the essential gene is metG comprising one or more of the following mutations: E45Q, N47R, I49G, and A51C. In some embodiments, the essential gene is metG comprising the mutations E45Q, N47R, I49G, and A51C. In some embodiments, the essential gene is adk comprising one or more of the following mutations: I4L, L51, and L6G. In some embodiments, the essential gene is adk comprising the mutations I4L, L51, and L6G. 
     In some embodiments, the genetically engineered bacterium is complemented by a ligand. In some embodiments, the ligand is selected from the group consisting of benzothiazole, indole, 2-aminobenzothiazole, indole-3-butyric acid, indole-3-acetic acid, and L-histidine methyl ester. For example, bacterial cells comprising mutations in metG (E45Q, N47R, I49G, and A51C) are complemented by benzothiazole, indole, 2-aminobenzothiazole, indole-3-butyric acid, indole-3-acetic acid or L-histidine methyl ester. Bacterial cells comprising mutations in dnaN (H191N, R240C, I317S, F319V, L340T, V347I, and S345C) are complemented by benzothiazole, indole or 2-aminobenzothiazole. Bacterial cells comprising mutations in pheS (F125G, P183T, P184A, R186A, and I188L) are complemented by benzothiazole or 2-aminobenzothiazole. Bacterial cells comprising mutations in tyrS (L36V, C38A, and F40G) are complemented by benzothiazole or 2-aminobenzothiazole. Bacterial cells comprising mutations in adk (I4L, L51, and L6G) are complemented by benzothiazole or indole. 
     In some embodiments, the genetically engineered bacterium comprises more than one mutant essential gene that renders it auxotrophic to a ligand. In some embodiments, the bacterial cell comprises mutations in two essential genes. For example, in some embodiments, the bacterial cell comprises mutations in tyrS (L36V, C38A, and F40G) and metG (E45Q, N47R, I49G, and A51C). In other embodiments, the bacterial cell comprises mutations in three essential genes. For example, in some embodiments, the bacterial cell comprises mutations in tyrS (L36V, C38A, and F40G), metG (E45Q, N47R, 149G, and A51C), and pheS (F125G, P183T, P184A, R186A, and I188L). 
     In some embodiments, the genetically engineered bacterium is a conditional auxotroph whose essential gene(s) is replaced using an arabinose system. 
     In some embodiments, the genetically engineered bacterium of the disclosure is an auxotroph and also comprises kill switch circuitry, such as any of the kill switch components and systems described herein. For example, the recombinant bacteria may comprise a deletion or mutation in an essential gene required for cell survival and/or growth, for example, in a DNA synthesis gene, for example, thyA, cell wall synthesis gene, for example, dapA and/or an amino acid gene, for example, serA or MetA and may also comprise a toxin gene that is regulated by one or more transcriptional activators that are expressed in response to an environmental condition(s) and/or signal(s) (such as low oxygen levels) or regulated by one or more recombinases that are expressed upon sensing an exogenous environmental condition(s) and/or signal(s) (such as the recombinase systems described herein). Other embodiments are described in Wright et al., “GeneGuard: A Modular Plasmid System Designed for Biosafety,” ACS Synthetic Biology (2015) 4: 307-16, the entire contents of which are expressly incorporated herein by reference). In some embodiments, the genetically engineered bacterium of the disclosure is an auxotroph and also comprises kill switch circuitry, such as any of the kill switch components and systems described herein, as well as another biosecurity system, such a conditional origin of replication (see Wright et al., supra). In other embodiments, auxotrophic modifications may also be used to screen for mutant bacteria that produce the substrate transporter. 
     Genetic Regulatory Circuits 
     In some embodiments, the genetically engineered bacteria comprise multi-layered genetic regulatory circuits for expressing the constructs described herein (see, e.g., U.S. Provisional Application No. 62/184,811, incorporated herein by reference in its entirety). The genetic regulatory circuits are useful to screen for mutant bacteria that produce a substrate transporter or rescue an auxotroph. In certain embodiments, the invention provides methods for selecting genetically engineered bacteria that produce one or more genes of interest. 
     In some embodiments, the invention provides genetically engineered bacteria comprising a gene or gene cassette for producing a payload and a T7 polymerase-regulated genetic regulatory circuit. For example, the genetically engineered bacteria comprise a first gene encoding a T7 polymerase, wherein the first gene is operably linked to a fumarate and nitrate reductase regulator (FNR)-responsive promoter; a second gene or gene cassette for producing a payload, wherein the second gene or gene cassette is operably linked to a T7 promoter that is induced by the T7 polymerase; and a third gene encoding an inhibitory factor, lysY, that is capable of inhibiting the T7 polymerase. In the presence of oxygen, FNR does not bind the FNR-responsive promoter, and the payload is not expressed. LysY is expressed constitutively (P-lac constitutive) and further inhibits T7 polymerase. In the absence of oxygen, FNR dimerizes and binds to the FNR-responsive promoter, T7 polymerase is expressed at a level sufficient to overcome lysY inhibition, and the payload is expressed. In some embodiments, the lysY gene is operably linked to an additional FNR binding site. In the absence of oxygen, FNR dimerizes to activate T7 polymerase expression as described above, and also inhibits lysY expression. 
     In some embodiments, the invention provides genetically engineered bacteria comprising a gene or gene cassette for producing a payload, and a protease-regulated genetic regulatory circuit. For example, the genetically engineered bacteria comprise a first gene encoding an mf-lon protease, wherein the first gene is operably linked to a FNR-responsive promoter; a second gene or gene cassette for producing a payload operably linked to a tet regulatory region (tetO); and a third gene encoding an mf-lon degradation signal linked to a tet repressor (tetR), wherein the tetR is capable of binding to the tet regulatory region and repressing expression of the second gene or gene cassette. The mf-lon protease is capable of recognizing the mf-lon degradation signal and degrading the tetR. In the presence of oxygen, FNR does not bind the FNR-responsive promoter, the repressor is not degraded, and the payload is not expressed. In the absence of oxygen, FNR dimerizes and binds the FNR-responsive promoter, thereby inducing expression of mf-lon protease. The mf-lon protease recognizes the mf-lon degradation signal and degrades the tetR, and the payload is expressed. 
     In some embodiments, the invention provides genetically engineered bacteria comprising a gene or gene cassette for producing a payload, and a repressor-regulated genetic regulatory circuit. For example, the genetically engineered bacteria comprise a first gene encoding a first repressor, wherein the first gene is operably linked to a FNR-responsive promoter; a second gene or gene cassette for producing a payload operably linked to a first regulatory region comprising a constitutive promoter; and a third gene encoding a second repressor, wherein the second repressor is capable of binding to the first regulatory region and repressing expression of the second gene or gene cassette. The third gene is operably linked to a second regulatory region comprising a constitutive promoter, wherein the first repressor is capable of binding to the second regulatory region and inhibiting expression of the second repressor. In the presence of oxygen, FNR does not bind the FNR-responsive promoter, the first repressor is not expressed, the second repressor is expressed, and the payload is not expressed. In the absence of oxygen, FNR dimerizes and binds the FNR-responsive promoter, the first repressor is expressed, the second repressor is not expressed, and the payload is expressed. 
     Examples of repressors useful in these embodiments include, but are not limited to, ArgR, TetR, ArsR, AscG, LacI, CscR, DeoR, DgoR, FruR, GaR, GatR, CI, LexA, RafR, QacR, and PtxS (US20030166191). 
     In some embodiments, the invention provides genetically engineered bacteria comprising a gene or gene cassette for producing a payload and a regulatory RNA-regulated genetic regulatory circuit. For example, the genetically engineered bacteria comprise a first gene encoding a regulatory RNA, wherein the first gene is operably linked to a FNR-responsive promoter, and a second gene or gene cassette for producing a payload. The second gene or gene cassette is operably linked to a constitutive promoter and further linked to a nucleotide sequence capable of producing an mRNA hairpin that inhibits translation of the payload. The regulatory RNA is capable of eliminating the mRNA hairpin and inducing payload translation via the ribosomal binding site. In the presence of oxygen, FNR does not bind the FNR-responsive promoter, the regulatory RNA is not expressed, and the mRNA hairpin prevents the payload from being translated. In the absence of oxygen, FNR dimerizes and binds the FNR-responsive promoter, the regulatory RNA is expressed, the mRNA hairpin is eliminated, and the payload is expressed. 
     In some embodiments, the invention provides genetically engineered bacteria comprising a gene or gene cassette for producing a payload, and a CRISPR-regulated genetic regulatory circuit. For example, the genetically engineered bacteria comprise a Cas9 protein; a first gene encoding a CRISPR guide RNA, wherein the first gene is operably linked to a FNR-responsive promoter; a second gene or gene cassette for producing a payload, wherein the second gene or gene cassette is operably linked to a regulatory region comprising a constitutive promoter; and a third gene encoding a repressor operably linked to a constitutive promoter, wherein the repressor is capable of binding to the regulatory region and repressing expression of the second gene or gene cassette. The third gene is further linked to a CRISPR target sequence that is capable of binding to the CRISPR guide RNA, wherein said binding to the CRISPR guide RNA induces cleavage by the Cas9 protein and inhibits expression of the repressor. In the presence of oxygen, FNR does not bind the FNR-responsive promoter, the guide RNA is not expressed, the repressor is expressed, and the payload is not expressed. In the absence of oxygen, FNR dimerizes and binds the FNR-responsive promoter, the guide RNA is expressed, the repressor is not expressed, and the payload is expressed. 
     In some embodiments, the invention provides genetically engineered bacteria comprising a gene or gene cassette for producing a payload and a recombinase-regulated genetic regulatory circuit. For example, the genetically engineered bacteria comprise a first gene encoding a recombinase, wherein the first gene is operably linked to a FNR-responsive promoter, and a second gene or gene cassette for producing a payload operably linked to a constitutive promoter. The second gene or gene cassette is inverted in orientation (3′ to 5′) and flanked by recombinase binding sites, and the recombinase is capable of binding to the recombinase binding sites to induce expression of the second gene or gene cassette by reverting its orientation (5′ to 3′). In the presence of oxygen, FNR does not bind the FNR-responsive promoter, the recombinase is not expressed, the payload remains in the 3′ to 5′ orientation, and no functional payload is produced. In the absence of oxygen, FNR dimerizes and binds the FNR-responsive promoter, the recombinase is expressed, the payload is reverted to the 5′ to 3′ orientation, and functional payload is produced. 
     In some embodiments, the invention provides genetically engineered bacteria comprising a gene or gene cassette for producing a payload and a polymerase- and recombinase-regulated genetic regulatory circuit. For example, the genetically engineered bacteria comprise a first gene encoding a recombinase, wherein the first gene is operably linked to a FNR-responsive promoter; a second gene or gene cassette for producing a payload operably linked to a T7 promoter; a third gene encoding a T7 polymerase, wherein the T7 polymerase is capable of binding to the T7 promoter and inducing expression of the payload. The third gene encoding the T7 polymerase is inverted in orientation (3′ to 5′) and flanked by recombinase binding sites, and the recombinase is capable of binding to the recombinase binding sites to induce expression of the T7 polymerase gene by reverting its orientation (5′ to 3′). In the presence of oxygen, FNR does not bind the FNR-responsive promoter, the recombinase is not expressed, the T7 polymerase gene remains in the 3′ to 5′ orientation, and the payload is not expressed. In the absence of oxygen, FNR dimerizes and binds the FNR-responsive promoter, the recombinase is expressed, the T7 polymerase gene is reverted to the 5′ to 3′ orientation, and the payload is expressed. 
     Host-Plasmid Mutual Dependency 
     In some embodiments, the genetically engineered bacteria of the invention also comprise a plasmid that has been modified to create a host-plasmid mutual dependency. In certain embodiments, the mutually dependent host-plasmid platform is GeneGuard (Wright et al., 2015). In some embodiments, the GeneGuard plasmid comprises (i) a conditional origin of replication, in which the requisite replication initiator protein is provided in trans; (ii) an auxotrophic modification that is rescued by the host via genomic translocation and is also compatible for use in rich media; and/or (iii) a nucleic acid sequence which encodes a broad-spectrum toxin. The toxin gene may be used to select against plasmid spread by making the plasmid DNA itself disadvantageous for strains not expressing the anti-toxin (e.g., a wild-type bacterium). In some embodiments, the GeneGuard plasmid is stable for at least 100 generations without antibiotic selection. In some embodiments, the GeneGuard plasmid does not disrupt growth of the host. The GeneGuard plasmid is used to greatly reduce unintentional plasmid propagation in the genetically engineered bacteria of the invention. 
     The mutually dependent host-plasmid platform may be used alone or in combination with other biosafety mechanisms, such as those described herein (e.g., kill switches, auxotrophies). In some embodiments, the genetically engineered bacteria comprise a GeneGuard plasmid. In other embodiments, the genetically engineered bacteria comprise a GeneGuard plasmid and/or one or more kill switches. In other embodiments, the genetically engineered bacteria comprise a GeneGuard plasmid and/or one or more auxotrophies. In still other embodiments, the genetically engineered bacteria comprise a GeneGuard plasmid, one or more kill switches, and/or one or more auxotrophies. 
     Kill Switch 
     In some embodiments, the genetically engineered bacteria of the invention also comprise a kill switch (see, e.g., U.S. Provisional Application Nos. 62/183,935 and 62/263,329 incorporated herein by reference in their entireties). The kill switch is intended to actively kill engineered microbes in response to external stimuli. As opposed to an auxotrophic mutation where bacteria die because they lack an essential nutrient for survival, the kill switch is triggered by a particular factor in the environment that induces the production of toxic molecules within the microbe that cause cell death. 
     Bacteria engineered with kill switches have been engineered for in vitro research purposes, e.g., to limit the spread of a biofuel-producing microorganism outside of a laboratory environment. Bacteria engineered for in vivo administration to treat a disease or disorder may also be programmed to die at a specific time after the expression and delivery of a heterologous gene or genes, for example, a therapeutic gene(s) or after the subject has experienced the therapeutic effect. For example, in some embodiments, the kill switch is activated to kill the bacteria after a period of time following oxygen level-dependent expression of the substrate transporter. In some embodiments, the kill switch is activated in a delayed fashion following oxygen level-dependent expression of the substrate transporter. Alternatively, the bacteria may be engineered to die if the bacteria have spread outside of a target site (e.g., a tumor site). Specifically, it may be useful to prevent the spread of the microorganism outside the area of interest (for example, outside of the tumor site) within the subject, or spread of the microorganism outside of the subject into the environment (for example, spread to the environment through the blood or stool of the subject). Examples of such toxins that can be used in kill switches include, but are not limited to, bacteriocins, lysins, and other molecules that cause cell death by lysing cell membranes, degrading cellular DNA, or other mechanisms. Such toxins can be used individually or in combination. The switches that control their production can be based on, for example, transcriptional activation (toggle switches; see, e.g., Gardner et al. (2000) Nature 403: 339-42), translation (riboregulators), or DNA recombination (recombinase-based switches), and can sense environmental stimuli such as anaerobiosis or reactive oxygen species. These switches can be activated by a single environmental factor or may require several activators in AND, OR, NAND and NOR logic configurations to induce cell death. For example, an AND riboregulator switch is activated by tetracycline, isopropyl β-D-1-thiogalactopyranoside (IPTG), and arabinose to induce the expression of lysins, which permeabilize the cell membrane and kill the cell. IPTG induces the expression of the endolysin and holin mRNAs, which are then derepressed by the addition of arabinose and tetracycline. All three inducers must be present to cause cell death. Examples of kill switches are known in the art (Callura et al. (2010)  Proc. Natl. Acad. Sci. USA  107(36): 15898-903.). In some embodiments, the kill switch is activated to kill the bacteria after a period of time following oxygen level-dependent expression of the substrate transporter. In some embodiments, the kill switch is activated in a delayed fashion following oxygen level-dependent expression of the substrate transporter. 
     Kill switches can be designed such that a toxin is produced in response to an environmental condition or external signal (e.g, the bacteria is killed in response to an external cue) or, alternatively designed such that a toxin is produced once an environmental condition no longer exists or an external signal is ceased. 
     Thus, in some embodiments, the genetically engineered bacteria of the disclosure are further programmed to die after sensing an exogenous environmental signal, for example, in a low oxygen environment. In some embodiments, the genetically engineered bacteria of the present disclosure comprise one or more genes encoding one or more recombinase(s), whose expression is induced in response to an environmental condition or signal and causes one or more recombination events that ultimately leads to the expression of a toxin which kills the cell. In some embodiments, the at least one recombination event is the flipping of an inverted heterologous gene encoding a bacterial toxin which is then constitutively expressed after it is flipped by the first recombinase. In one embodiment, constitutive expression of the bacterial toxin kills the genetically engineered bacterium. In these types of kill switch systems, once the engineered bacterial cell senses the exogenous environmental condition and expresses the heterologous gene of interest, the recombinant bacterial cell is no longer viable. 
     In another embodiment in which the genetically engineered bacteria of the present disclosure express one or more recombinase(s) in response to an environmental condition or signal causing at least one recombination event, the genetically engineered bacterium further expresses a heterologous gene encoding an anti-toxin in response to an exogenous environmental condition or signal. In one embodiment, the at least one recombination event is flipping of an inverted heterologous gene encoding a bacterial toxin by a first recombinase. In one embodiment, the inverted heterologous gene encoding the bacterial toxin is located between a first forward recombinase recognition sequence and a first reverse recombinase recognition sequence. In one embodiment, the heterologous gene encoding the bacterial toxin is constitutively expressed after it is flipped by the first recombinase. In one embodiment, the anti-toxin inhibits the activity of the toxin, thereby delaying death of the genetically engineered bacterium. In one embodiment, the genetically engineered bacterium is killed by the bacterial toxin when the heterologous gene encoding the anti-toxin is no longer expressed when the exogenous environmental condition is no longer present. 
     In another embodiment, the at least one recombination event is flipping of an inverted heterologous gene encoding a second recombinase by a first recombinase, followed by the flipping of an inverted heterologous gene encoding a bacterial toxin by the second recombinase. In one embodiment, the inverted heterologous gene encoding the second recombinase is located between a first forward recombinase recognition sequence and a first reverse recombinase recognition sequence. In one embodiment, the inverted heterologous gene encoding the bacterial toxin is located between a second forward recombinase recognition sequence and a second reverse recombinase recognition sequence. In one embodiment, the heterologous gene encoding the second recombinase is constitutively expressed after it is flipped by the first recombinase. In one embodiment, the heterologous gene encoding the bacterial toxin is constitutively expressed after it is flipped by the second recombinase. In one embodiment, the genetically engineered bacterium is killed by the bacterial toxin. In one embodiment, the genetically engineered bacterium further expresses a heterologous gene encoding an anti-toxin in response to the exogenous environmental condition. In one embodiment, the anti-toxin inhibits the activity of the toxin when the exogenous environmental condition is present, thereby delaying death of the genetically engineered bacterium. In one embodiment, the genetically engineered bacterium is killed by the bacterial toxin when the heterologous gene encoding the anti-toxin is no longer expressed when the exogenous environmental condition is no longer present. 
     In one embodiment, the at least one recombination event is flipping of an inverted heterologous gene encoding a second recombinase by a first recombinase, followed by flipping of an inverted heterologous gene encoding a third recombinase by the second recombinase, followed by flipping of an inverted heterologous gene encoding a bacterial toxin by the third recombinase. 
     In one embodiment, the at least one recombination event is flipping of an inverted heterologous gene encoding a first excision enzyme by a first recombinase. In one embodiment, the inverted heterologous gene encoding the first excision enzyme is located between a first forward recombinase recognition sequence and a first reverse recombinase recognition sequence. In one embodiment, the heterologous gene encoding the first excision enzyme is constitutively expressed after it is flipped by the first recombinase. In one embodiment, the first excision enzyme excises a first essential gene. In one embodiment, the programmed recombinant bacterial cell is not viable after the first essential gene is excised. 
     In one embodiment, the first recombinase further flips an inverted heterologous gene encoding a second excision enzyme. In one embodiment, the wherein the inverted heterologous gene encoding the second excision enzyme is located between a second forward recombinase recognition sequence and a second reverse recombinase recognition sequence. In one embodiment, the heterologous gene encoding the second excision enzyme is constitutively expressed after it is flipped by the first recombinase. In one embodiment, the genetically engineered bacterium dies or is no longer viable when the first essential gene and the second essential gene are both excised. In one embodiment, the genetically engineered bacterium dies or is no longer viable when either the first essential gene is excised or the second essential gene is excised by the first recombinase. 
     In one embodiment, the genetically engineered bacterium dies after the at least one recombination event occurs. In another embodiment, the genetically engineered bacterium is no longer viable after the at least one recombination event occurs. 
     In any of these embodiment, the recombinase can be a recombinase selected from the group consisting of. BxbI, PhiC31, TP901, BxbI, PhiC31, TP901, HK022, HP1, R4, Int1, Int2, Int3, Int4, Int5, Int6, Int7, Int8, Int9, Int1O, Int1, Int12, Int13, Int14, Int15, Int16, Int17, Int18, Int19, Int20, Int21, Int22, Int23, Int24, Int25, Int26, Int27, Int28, Int29, Int30, Int31, Int32, Int33, and Int34, or a biologically active fragment thereof. 
     In the above-described kill switch circuits, a toxin is produced in the presence of an environmental factor or signal. In another aspect of kill switch circuitry, a toxin may be repressed in the presence of an environmental factor (not produced) and then produced once the environmental condition or external signal is no longer present. Such kill switches are called repression-based kill switches and represent systems in which the bacterial cells are viable only in the presence of an external factor or signal, such as arabinose or other sugar. Exemplary kill switch designs in which the toxin is repressed in the presence of an external factor or signal (and activated once the external signal is removed) are shown in  FIGS. 12-16 . The disclosure provides recombinant bacterial cells which express one or more heterologous gene(s) upon sensing arabinose or other sugar in the exogenous environment. In this aspect, the recombinant bacterial cells contain the araC gene, which encodes the AraC transcription factor, as well as one or more genes under the control of the araBAD promoter. In the absence of arabinose, the AraC transcription factor adopts a conformation that represses transcription of genes under the control of the araBAD promoter. In the presence of arabinose, the AraC transcription factor undergoes a conformational change that allows it to bind to and activate the AraBAD promoter, which induces expression of the desired gene, for example tetR, which represses expression of a toxin gene. In this embodiment, the toxing gene is repressed in the presence of arabinose or other sugar. In an environment where arabinose is not present, the tetR gene is not activated and the toxin is expressed, thereby killing the bacteria. The arbinoase system can also be used to express an essential gene, in which the essential gene is only expressed in the presence of arabinose or other sugar and is not expressed when arabinose or other sugar is absent from the environment. 
     Thus, in some embodiments in which one or more heterologous gene(s) are expressed upon sensing arabinose in the exogenous environment, the one or more heterologous genes are directly or indirectly under the control of the araBAD promoter. In some embodiments, the expressed heterologous gene is selected from one or more of the following: a heterologous therapeutic gene, a heterologous gene encoding an antitoxin, a heterologous gene encoding a repressor protein or polypeptide, for example, a TetR repressor, a heterologous gene encoding an essential protein not found in the bacterial cell, and/or a heterologous encoding a regulatory protein or polypeptide. 
     Arabinose inducible promoters are known in the art, including P ara , P araB , P araC , and P araBAD . In one embodiment, the arabinose inducible promoter is from  E. coli . In some embodiments, the P araC  promoter and the P araBAD  promoter operate as a bidirectional promoter, with the P araBAD  promoter controlling expression of a heterologous gene(s) in one direction, and the P araC  (in close proximity to, and on the opposite strand from the P araBAD  promoter), controlling expression of a heterologous gene(s) in the other direction. In the presence of arabinose, transcription of both heterologous genes from both promoters is induced. However, in the absence of arabinose, transcription of both heterologous genes from both promoters is not induced. 
     In one exemplary embodiment of the disclosure, the genetically engineered bacteria of the present disclosure contains a kill-switch having at least the following sequences: a P amBAD  promoter operably linked to a heterologous gene encoding a Tetracycline Repressor Protein (TetR), a P araC  promoter operably linked to a heterologous gene encoding AraC transcription factor, and a heterologous gene encoding a bacterial toxin operably linked to a promoter which is repressed by the Tetracycline Repressor Protein (Pet). In the presence of arabinose, the AraC transcription factor activates the P araBAD  promoter, which activates transcription of the TetR protein, which, in turn, represses transcription of the toxin. In the absence of arabinose, however, AraC suppresses transcription from the the P araBAD  promoter and no TetR protein is expressed. In this case, expression of the heterologous toxin gene is activated, and the toxin is expressed. The toxin builds up in the recombinant bacterial cell, and the recombinant bacterial cell is killed. In one embodiment, the AraC gene encoding the AraC transcription factor is under the control of a constitutive promoter and is therefore constitutively expressed. 
     In one embodiment of the disclosure, the genetically engineered bacterium further comprises an antitoxin under the control of a constitutive promoter. In this situation, in the presence of arabinose, the toxin is not expressed due to repression by TetR protein, and the antitoxin protein builds-up in the cell. However, in the absence of arabinose, TetR protein is not expressed, and expression of the toxin is induced. The toxin begins to build-up within the recombinant bacterial cell. The recombinant bacterial cell is no longer viable once the toxin protein is present at either equal or greater amounts than that of the anti-toxin protein in the cell, and the recombinant bacterial cell will be killed by the toxin. 
     In another embodiment of the disclosure, the genetically engineered bacterium further comprises an antitoxin under the control of the P araBAD  promoter. In this situation, in the presence of arabinose, TetR and the anti-toxin are expressed, the anti-toxin builds up in the cell, and the toxin is not expressed due to repression by TetR protein. However, in the absence of arabinose, both the TetR protein and the anti-toxin are not expressed, and expression of the toxin is induced. The toxin begins to build-up within the recombinant bacterial cell. The recombinant bacterial cell is no longer viable once the toxin protein is expressed, and the recombinant bacterial cell will be killed by the toxin. 
     In another exemplary embodiment of the disclosure, the genetically engineered bacteria of the present disclosure contain a kill-switch having at least the following sequences: a P amBAD  promoter operably linked to a heterologous gene encoding an essential polypeptide not found in the recombinant bacterial cell (and required for survival), and a P araC  promoter operably linked to a heterologous gene encoding AraC transcription factor. In the presence of arabinose, the AraC transcription factor activates the P araBAD  promoter, which activates transcription of the heterologous gene encoding the essential polypeptide, allowing the recombinant bacterial cell to survive. In the absence of arabinose, however, AraC suppresses transcription from the P araBAD  promoter and the essential protein required for survival is not expressed. In this case, the recombinant bacterial cell dies in the absence of arabinose. In some embodiments, the sequence of P araBAD  promoter operably linked to a heterologous gene encoding an essential polypeptide not found in the recombinant bacterial cell can be present in the bacterial cell in conjunction with the TetR/toxin kill-switch system described directly above. In some embodiments, the sequence of P araBAD  promoter operably linked to a heterologous gene encoding an essential polypeptide not found in the recombinant bacterial cell can be present in the bacterial cell in conjunction with the TetR/toxin/anto-toxin kill-switch system described directly above. 
     In yet other embodiments, the bacteria may comprise a plasmid stability system with a plasmid that produces both a short-lived anti-toxin and a long-lived toxin. In this system, the bacterial cell produces equal amounts of toxin and anti-toxin to neutralize the toxin. However, if/when the cell loses the plasmid, the short-lived anti-toxin begins to decay. When the anti-toxin decays completely the cell dies as a result of the longer-lived toxin killing it. 
     In some embodiments, the engineered bacteria of the present disclosure that are capable of producing a substrate transporter further comprise the gene(s) encoding the components of any of the above-described kill switch circuits. 
     In any of the above-described embodiments, the bacterial toxin is selected from the group consisting of a lysin, Hok, Fst, TisB, LdrD, Kid, SymE, MazF, FlmA, Ibs, XCV2162, dinJ, CcdB, MazF, ParE, YafO, Zeta, hicB, relB, yhaV, yoeB, chpBK, hipA, microcin B, microcin B17, microcin C, microcin C7-C51, microcin J25, microcin ColV, microcin 24, microcin L, microcin D93, microcin L, microcin E492, microcin H47, microcin 147, microcin M, colicin A, colicin E1, colicin K, colicin N, colicin U, colicin B, colicin Ia, colicin Ib, colicin 5, colicin10, colicin S4, colicin Y, colicin E2, colicin E7, colicin E8, colicin E9, colicin E3, colicin E4, colicin E6; colicin E5, colicin D, colicin M, and cloacin DF13, or a biologically active fragment thereof. 
     In any of the above-described embodiments, the anti-toxin is selected from the group consisting of an anti-lysin, Sok, RNAII, IstR, RdlD, Kis, SymR, MazE, FlmB, Sib, ptaRNA1, yafQ, CcdA, MazE, ParD, yafN, Epsilon, HicA, relE, prlF, yefM, chpBI, hipB, MccE, MccE CTD , MccF, Cai, ImmEl, Cki, Cni, Cui, Cbi, Iia, Imm, Cfi, Im10, Csi, Cyi, Im2, Im7, Im8, Im9, Im3, Im4, ImmE6, cloacin immunity protein (Cim), ImmE5, ImmD, and Cmi, or a biologically active fragment thereof. 
     In one embodiment, the bacterial toxin is bactericidal to the genetically engineered bacterium. In one embodiment, the bacterial toxin is bacteriostatic to the genetically engineered bacterium. 
     In some embodiments, provided herein are genetically engineered bacteria comprising a heterologous gene encoding a substrate transporter, wherein the gene or gene cassette for producing the substrate transporter is controlled by a promoter that is induced under low-oxygen or anaerobic conditions. In some embodiments, the promoter is selected from the fumarate and nitrate reductase regulator (FNR) promoter, arginine deiminiase and nitrate reduction (ANR) promoter, and dissimilatory nitrate respiration regulator (DNR) promoter. 
     In some embodiments, the genetically engineered bacteria comprising a heterologous gene encoding a substrate transporter is an auxotroph selected from a cysE, glnA, ilvD, leuB, lysA, serA, metA, glyA, hisB, ilvA, pheA, proA, thrC, trpC, tyrA, thyA, uraA, dapA, dapB, dapD, dapE, dapF, flhD, metB, metC, proAB, and thil auxotroph. In some embodiments, the engineered bacteria have more than one auxotrophy, for example, they may be a ΔthyA and ΔdapA auxotroph. 
     In some embodiments, the genetically engineered bacteria comprising a heterologous gene encoding a substrate transporter further comprises a kill switch circuit, such as any of the kill switch circuits provided herein. For example, in some embodiments, the genetically engineered bacteria further comprise one or more genes encoding one or more recombinase(s) under the control of an inducible promoter and an inverted toxin sequence. In some embodiments, the genetically engineered bacteria further comprise one or more genes encoding an anti-toxin. In some embodiments, the engineered bacteria further comprise one or more genes encoding one or more recombinase(s) under the control of an inducible promoter and one or more inverted excision genes, wherein the excision gene(s) encode an enzyme that deletes an essential gene. In some embodiments, the genetically engineered bacteria further comprise one or more genes encoding an anti-toxin. 
     In some instances, basal or leaky expression from an inducible promoter may result in the activation of the kill switch, thereby creating strong selective pressure for one or more mutations that disable the switch and thus the ability to kill the cell. In some embodiments, an environmental factor, e.g. arabinose, is present during manufacturing, and activates the production of a repressor that shuts down toxin production. Mutations in this circuit, with the exception of the toxin gene itself, will result in death with reduced chance for negative selection. When the environmental factor is absent, the repressor stops being made, and the toxin is produced. When the toxin concentration overcomes that of the antitoxin, the cell dies. In some embodiments, variations in the promoter and ribosome binding sequences of the antitoxin and the toxin allow for tuning of the circuit to produce variations in the timing of cell death. In alternate embodiments, the circuit comprises recombinases that are repressed by tetR and produced in the absence of tetR. These recombinases are capable of flipping the toxin gene or its promoter into the active configuration, thereby resulting in toxin production. 
     Synthetic gene circuits express on plasmids may function well in the short term but lose ability and/or function in the long term, e.g., in the stringent conditions found in a tumor microenvironment (Danino et al. (2015)  Sci. Transl. Med.  7(289):289ra84). In some embodiments, the genetically engineered bacteria comprise stable circuits for expressing genes of interest, e.g., a substrate transporter, over prolonged periods. In some embodiments, the genetically engineered bacteria are capable of targeting cancerous cells and producing a substrate transporter and further comprise a toxin-antitoxin system that simultaneously produces a toxin (hok) and a short-lived antitoxin (sok), wherein loss of the plasmid causes the cell to be killed by the long-lived toxin (Danino et al., 2015;  FIG. 21 ). In some embodiments, the genetically engineered bacteria further comprise alp7 from  B. subtilis  plasmid pL20 and produces filaments that are capable of pushing plasmids to the poles of the cells in order to ensure equal segregation during cell division (Danino et al., 2015). 
     In some embodiments, the genetically engineered bacteria comprising a heterologous gene encoding a substrate transporter is an auxotroph and further comprises a kill switch circuit, such as any of the kill switch circuits described herein. 
     In some embodiments of the above described genetically engineered bacteria, the gene encoding the substrate transporter is present on a plasmid in the bacterium and operatively linked on the plasmid to the promoter that is induced under low-oxygen or anaerobic conditions. The genetically engineered bacteria are capable of local and tumor-specific delivery of the substrate transporter, e.g., an amino acid transporter. In other embodiments, the gene encoding the substrate transporter is present in the bacterial chromosome and is operatively linked in the chromosome to the promoter that is induced under low-oxygen or anaerobic conditions. The genetically engineered bacteria are capable of local and tumor-specific delivery of the substrate transporter. 
     Pharmaceutical Compositions and Formulations 
     Pharmaceutical compositions comprising the genetically engineered microrganisms of the invention may be used to treat, manage, ameliorate, and/or prevent a disease or condition disclosed herein. Pharmaceutical compositions of the invention comprising one or more genetically engineered bacteria with prophylactic agents, therapeutic agents, and/or pharmaceutically acceptable carriers are provided. 
     In certain embodiments, the pharmaceutical composition comprises one species, strain, or subtype of bacteria that are engineered to comprise the genetic modifications described herein, e.g., one or more genes encoding one or more substrate transporters. In alternate embodiments, the pharmaceutical composition comprises two or more species, strains, and/or subtypes of bacteria that are each engineered to comprise the genetic modifications described herein, e.g., one or more genes encoding one or more substrate transporters. 
     In some embodiments, the genetically engineered bacteria are administered systemically or intratumorally as spores. As a non-limiting example, the genetically engineered bacteria are Clostridia, and administration results in a selective colonization of hypoxic/necrotic areas within a tumor. In some embodiments, the spores germinate exclusively in the hypoxic/necrotic regions present in solid tumours and nowhere else in the body. 
     The pharmaceutical compositions of the invention may be formulated in a conventional manner using one or more physiologically acceptable carriers comprising excipients and auxiliaries, which facilitate processing of the active ingredients into compositions for pharmaceutical use. Methods of formulating pharmaceutical compositions are known in the art (see, e.g., “Remington&#39;s Pharmaceutical Sciences,” Mack Publishing Co., Easton, Pa.). In some embodiments, the pharmaceutical compositions are subjected to tabletting, lyophilizing, direct compression, conventional mixing, dissolving, granulating, levigating, emulsifying, encapsulating, entrapping, or spray drying to form tablets, granulates, nanoparticles, nanocapsules, microcapsules, microtablets, pellets, or powders, which may be enterically coated or uncoated. Appropriate formulation depends on the route of administration. 
     The genetically engineered microorganisms may be formulated into pharmaceutical compositions in any suitable dosage form (e.g., liquids, capsules, sachet, hard capsules, soft capsules, tablets, enteric coated tablets, suspension powders, granules, or matrix sustained release formations for oral administration) and for any suitable type of administration (e.g., oral, topical, injectable, intravenous, sub-cutaneous, intratumoral, peritumor, immediate-release, pulsatile-release, delayed-release, or sustained release). Suitable dosage amounts for the genetically engineered bacteria may range from about 104 to 10 12  bacteria. The composition may be administered once or more daily, weekly, or monthly. The composition may be administered before, during, or following a meal. In one embodiment, the pharmaceutical composition is administered before the subject eats a meal. In one embodiment, the pharmaceutical composition is administered currently with a meal. In on embodiment, the pharmaceutical composition is administered after the subject eats a meal. 
     The genetically engineered bacteria or genetically engineered virus may be formulated into pharmaceutical compositions comprising one or more pharmaceutically acceptable carriers, thickeners, diluents, buffers, buffering agents, surface active agents, neutral or cationic lipids, lipid complexes, liposomes, penetration enhancers, carrier compounds, and other pharmaceutically acceptable carriers or agents. For example, the pharmaceutical composition may include, but is not limited to, the addition of calcium bicarbonate, sodium bicarbonate, calcium phosphate, various sugars and types of starch, cellulose derivatives, gelatin, vegetable oils, polyethylene glycols, and surfactants, including, for example, polysorbate 20. In some embodiments, the genetically engineered bacteria of the invention may be formulated in a solution of sodium bicarbonate, e.g., 1 molar solution of sodium bicarbonate (to buffer an acidic cellular environment, such as the stomach, for example). The genetically engineered bacteria may be administered and formulated as neutral or salt forms. Pharmaceutically acceptable salts include those formed with anions such as those derived from hydrochloric, phosphoric, acetic, oxalic, tartaric acids, etc., and those formed with cations such as those derived from sodium, potassium, ammonium, calcium, ferric hydroxides, isopropylamine, triethylamine, 2-ethylamino ethanol, histidine, procaine, etc. 
     The genetically engineered microorganisms may be administered intravenously, e.g., by infusion or injection. Alternatively, the genetically engineered microorganisms may be administered intratumorally and/or peritumorally. In other embodiments, the genetically engineered microorganisms may be administered intra-arterially, intramuscularly, or intraperitoneally. In some embodiments, the genetically engineered bacteria colonize about 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or more of the target site (e.g., a tumor). In some embodiments, the genetically engineered bacteria are co-administered with a PEGylated form of rHuPH20 (PEGPH20) or other agent in order to destroy the tumor septae in order to enhance penetration of the tumor capsule, collagen, and/or stroma. In some embodiments, the genetically engineered bacteria are capable of producing a substrate transporter as well as one or more enzymes that degrade fibrous tissue. 
     The genetically engineered microroganisms of the disclosure may be administered via intratumoral injection, resulting in bacterial cells that are directly deposited within the target tissue (e.g., a tumor). Intratumoral injection of the engineered bacteria may elicit a potent localized inflammatory response as well as an adaptive immune response against tumor cells. Bacteria are suspended in solution before being withdrawn into a 1-ml syringe. In some embodiments, the tumor is injected with an 18-gauge multipronged needle (Quadra-Fuse, Rex Medical). The injection site is aseptically prepared. If available, ultrasound or CT may be used to identify a necrotic region of the tumor for injection. If a necrotic region is not identified, the injection can be directed to the center of the tumor. The needle is inserted once into a predefined region, and dispensed with even pressure. The injection needle is removed slowly, and the injection site is sterilized. 
     Direct intratumoral injection of the genetically engineered bacteria of the invention into a target tissue (e.g., a solid tumor) may be advantageous as compared to intravenous administration. Using an intravenous injection method, only a small proporation of the bacteria may reach the target tumor. For example, following  E. coli  Nissle injection into the tail vein of 4T1 tumor-bearing mice, most bacteria (&gt;99%) are quickly cleared from the animals and only a small percentage of the administered bacteria colonize the tumor (Stritzker et al., 2007). In particular, in large animals and human patients, which have relatively large blood volumes and relatively small tumors compared to mice, intratumoral injection may be especially beneficial. Injection directly into the tumor allows the delivery of a higher concentration of therapeutic agent and avoids the toxicity, which can result from systemic administration. In addition, intratumoral injection of bacteria induces robust and localized immune responses within the tumor. 
     Depending on the location, tumor type, and tumor size, different administration techniques may be used, including but not limited to, cutaneous, subcutaneous, and percutaneous injection, therapeutic endoscopic ultrasonography, or endobronchial intratumor delivery. Prior to the intratumor administration procedures, sedation in combination with a local anesthetic and standard cardiac, pressure, and oxygen monitoring, or full anesthesia of the patient is performed. 
     For some tumors, percutaneous injection can be employed, which is the least invasive administration method. Ultrasound, computed tomography (CT) or fluoroscopy can be used as guidance to introduce and position the needle. Percutaneous intratumoral injection is for example described for hepatocellular carcinoma in Lencioni et al. (2010)  J. Vasc Interv Radiol.  21(10): 1533-8). Intratumoral injection of cutaneous, subcutaneous, and nodal tumors is for example described in WO/2014/036412 (Amgen) for late stage melanoma. 
     Single insertion points or multiple insertion points can be used in percutaneous injection protocols. Using a single insertion point, the solution may be injected percutaneously along multiple tracks, as far as the radial reach of the needle allows. In other embodiments, multiple injection points may be used if the tumor is larger than the radial reach of the needle. The needle can be pulled back without exiting, and redirected as often as necessary until the full dose is injected and dispersed. To maintain sterility, a separate needle is used for each injection. Needle size and length varies depending on the tumor type and size. 
     In some embodiments, the tumor is injected percutaneously with an 18-gauge multipronged needle (Quadra-Fuse, Rex Medical). The device consists of an 18 gauge puncture needle 20 cm in length. The needle has three retractable prongs, each with four terminal side holes and a connector with extension tubing clamp. The prongs are deployed from the lateral wall of the needle. The needle can be introduced percutaneously into the center of the tumor and can be positioned at the deepest margin of the tumor. The prongs are deployed to the margins of the tumor. The prongs are deployed at maximum length and then are retracted at defined intervals. Optionally, one or more rotation-injection-rotation maneuvers can be performed, in which the prongs are retracted, the needle is rotated by a 60 degrees, which is followed by repeat deployment of the prongs and additional injection. 
     Therapeutic endoscopic ultrasonography (EUS) is employed to overcome the anatomical constraints inherent in gaining access to certain other tumors (Shirley et al. (2013)  Gastroenterol Res. Pract.  2013: 207129). EUS-guided fine needle injection (EUS-FNI) has been successfully used for antitumor therapies for the treatment of head and neck, esophageal, pancreatic, hepatic, and adrenal masses (Verna et al. (2008)  Therap. Adv Gastroenterol.  1(2): 103-9). EUS-FNI has been extensively used for pancreatic cancer injections. Fine-needle injection requires the use of the curvilinear echoendoscope. The esophagus is carefully intubated and the echoendoscope is passed into the stomach and duodenum where the pancreatic examination occurs and the target tumor is identified. The largest plane is measured to estimate the tumor volume and to calculate the injection volume. The appropriate volume is drawn into a syringe. A primed 22-gauge fine needle aspiration (FNA) needle is passed into the working channel of the echoendoscope. Under ultrasound guidance, the needle is passed into the tumor. Depending on the size of the tumor, administration can be performed by dividing the tumor into sections and then injecting the corresponding fractions of the volume into each section. Use of an installed endoscopic ultrasound processor with Doppler technology assures there are no arterial or venous structures that may interfere with the needle passage into the tumor (Shirley et al., 2013). In some embodiments, ‘multiple injectable needle’ (MIN) for EUS-FNI can be used to improvement the injection distribution to the tumor in comparison with straight-type needles (Ohara et al. (2013)  Mol. Clin. Oncol.  1(2): 231-4). 
     Intratumoral administration for lung cancer, such as non-small cell lung cancer, can be achieved through endobronchial intratumor delivery methods, as described in Celikoglu et al., 2008. Bronchoscopy (trans-nasal or oral) is conducted to visualize the lesion to be treated. The tumor volume can be estimated visually from visible length-width height measurements over the bronchial surface. The needle device is then introduced through the working channel of the bronchoscope. The needle catheter, which consists of a metallic needle attached to a plastic catheter, is placed within a sheath to prevent damage by the needle to the working channel during advancement. The needle size and length varies and is determined according to tumor type and size of the tumor. Needles made from plastic are less rigid than metal needles and are ideal, since they can be passed around sharper bends in the working channel. The needle is inserted into the lesion and the genetically engineered bacteria of the invention are in injected. Needles are inserted repeatedly at several insertion points until the tumor mass is completely perfused. After each injection, the needle is withdrawn entirely from the tumor and is then embedded at another location. At the end of the bronchoscopic injection session, removal of any necrotic debris caused by the treatment may be removed using mechanical dissection, or other ablation techniques accompanied by irrigation and aspiration. 
     In some embodiments, the genetically engineered bacteria are administrated directly into the tumor using methods, including but not limited to, percutaneous injection, EUS-FNI, or endobronchial intratumor delivery methods. In some cases other techniques, such as laproscopic or open surgical techniques are used to access the target tumor, however, these techniques are much more invasive and bring with them much greater morbidity and longer hospital stays. 
     In some embodiments, bacteria, e.g.,  E. coli  Nissle, or spores, e.g.,  Clostridium novyi  NT, are dissolved in sterile phosphate buffered saline (PBS) for systemic or intratumor injection. 
     The dose to be injected is derived from the type and size of the tumor. The dose of a drug or the genetically engineered bacteria or virus of the invention is typically lower, e.g., orders of magnitude lower, than a dose for systemic intravenous administration. 
     The volume injected into each lesion is based on the size of the tumor. To obtain the tumor volume, a measurement of the largest plane can be conducted. The estimated tumor volume can then inform the determination of the injection volume as a percentage of the total volume. For example, an injection volume of approximately 20-40% of the total tumor volume can be used. 
     For example, as is described, for example, in WO 2014/036412, for tumors larger than 5 cm in their largest dimension, up to 4 ml can be injected. For tumors between 2.5 and 5 cm in their largest dimension, up to 2 ml can be injected. For tumors between 2.5 and 5 cm in their largest dimension, up to 2 ml can be injected. For tumors between 1.5 and 2.5 cm in their largest dimension, up to 1 ml can be injected. For tumors between 0.5 and 1.5 cm in their largest dimension, up to 0.5 ml can be injected. For tumors equal or small than 0.5 in their largest dimension, up to 0.1 ml can be injected. Alternatively, ultrasound scan can be used to determine the injection volume that can be taken up by the tumor without leakage into surrounding tissue. 
     In some embodiments, the treatment regimen will include one or more intratumoral administrations. In some embodiments, a treatment regimen will include an initial dose, which followed by at least one subsequent dose. One or more doses can be administered sequentially in two or more cycles. 
     For example a first dose may be administered at day 1, and a second dose may be administered after 1, 2, 3, 4, 5, 6, days or 1, 2, 3, or 4 weeks or after a longer interval. Additional doses may be administered after 1, 2, 3, 4, 5, 6, days or after 1, 2, 3, or 4 weeks or longer intervals. In some embodiments, the first and subsequent administrations have the same dosage. In other embodiments, different doses are administered. In some embodiments, more than one dose is administered per day, for example, two, three or more doses can be administered per day. 
     The routes of administration and dosages described are intended only as a guide. The optimum route of administration and dosage can be readily determined by a skilled practitioner. The dosage may be determined according to various parameters, especially according to the location of the tumor, the size of the tumor, the age, weight and condition of the patient to be treated and the route and method of administration. 
     In one embodiment,  Clostridium  spores are delivered systemically. In another embodiment,  Clostridium  spores are delivered via intratumor injection. In one embodiment,  E. coli  Nissle are delivered via intratumor injection In other embodiments,  E. coli  Nissle, which is known to hone to tumors, is administered via intravenous injection or orally, as described in a mouse model in for example in Danino et al. 2015, or Stritzker et al., 2007, the contents of which is herein incorporated by reference in its entirety.  E. coli  Nissle mutations to reduce toxicity include but are not limited to msbB mutants resulting in non-myristoylated LPS and reduced endotoxin activity, as described in Stritzker et al., 2010 (Stritzker et al, Bioengineered Bugs 1:2, 139-145; Myroystoation negative msbB-mutants of probiotic  E. coli  Nissle 1917 retain tumor specific colonization properties but show less side effects in immunocompetent mice. 
     For intravenous injection a preferred dose of bacteria is the dose in which the greatest number of bacteria is found in the tumor and the lowest amount found in other tissues. In mice, Stritzker et al. (2007)  Int. J. Med. Microbiol.  297 (2007) 151-162) found that the lowest number of bacteria needed for successful tumor colonization was 2×10 4  CFU, in which half of the mice showed tumor colonization. Injection of 2×10 5  and 2×10 6  CFU resulted in colonization of all tumors, and numbers of bacteria in the tumors increased. However, at higher concentrations, bacterial counts became detectable in the liver and the spleen. 
     In some embodiments, the genetically engineered microorganisms of the invention may be administered orally. In some embodiments the genetically engineered bacteria may be useful in the prevention, treatment or management of liver cancer or liver metastases. For example, Danino et al. showed that orally administered  E. coli  Nissle is able to colonize liver metastases by crossing the gastrointestinal tract in a mouse model of liver metastases (Danino et al.,  Science Translational Medicine  7 (289): 1-10, the contents of which is herein incorporated by reference in its entirety). 
     Tumor types into which the engineered bacteria of the current invention are intratumorally delivered include locally advanced and metastatic tumors, including but not limited to, B, T, and NK cell lymphomas, colon and rectal cancers, melanoma, including metastatic melanoma, mycosis fungoides, Merkel carcinoma, liver cancer, including hepatocellular carcinoma and liver metastasis secondary to colorectal cancer, pancreatic cancer, breast cancer, follicular lymphoma, prostate cancer, refractory liver cancer, and Merkel cell carcinoma. 
     The genetically engineered microorganisms disclosed herein may be administered topically and formulated in the form of an ointment, cream, transdermal patch, lotion, gel, shampoo, spray, aerosol, solution, emulsion, or other form well known to one of skill in the art. See, e.g., “Remington&#39;s Pharmaceutical Sciences,” Mack Publishing Co., Easton, Pa. In an embodiment, for non-sprayable topical dosage forms, viscous to semi-solid or solid forms comprising a carrier or one or more excipients compatible with topical application and having a dynamic viscosity greater than water are employed. Suitable formulations include, but are not limited to, solutions, suspensions, emulsions, creams, ointments, powders, liniments, salves, etc., which may be sterilized or mixed with auxiliary agents (e.g., preservatives, stabilizers, wetting agents, buffers, or salts) for influencing various properties, e.g., osmotic pressure. Other suitable topical dosage forms include sprayable aerosol preparations wherein the active ingredient in combination with a solid or liquid inert carrier, is packaged in a mixture with a pressurized volatile (e.g., a gaseous propellant, such as freon) or in a squeeze bottle. Moisturizers or humectants can also be added to pharmaceutical compositions and dosage forms. Examples of such additional ingredients are well known in the art. In one embodiment, the pharmaceutical composition comprising the recombinant bacteria of the invention may be formulated as a hygiene product. For example, the hygiene product may be an antibacterial formulation, or a fermentation product such as a fermentation broth. Hygiene products may be, for example, shampoos, conditioners, creams, pastes, lotions, and lip balms. 
     The genetically engineered microorganisms disclosed herein may be administered orally and formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions, etc. Pharmacological compositions for oral use can be made using a solid excipient, optionally grinding the resulting mixture, and processing the mixture of granules, after adding suitable auxiliaries if desired, to obtain tablets or dragee cores. Suitable excipients include, but are not limited to, fillers such as sugars, including lactose, sucrose, mannitol, or sorbitol; cellulose compositions such as maize starch, wheat starch, rice starch, potato starch, gelatin, gum tragacanth, methyl cellulose, hydroxypropylmethyl-cellulose, sodium carbomethylcellulose; and/or physiologically acceptable polymers such as polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG). Disintegrating agents may also be added, such as cross-linked polyvinylpyrrolidone, agar, alginic acid or a salt thereof such as sodium alginate. 
     Tablets or capsules can be prepared by conventional means with pharmaceutically acceptable excipients such as binding agents (e.g., pregelatinised maize starch, polyvinylpyrrolidone, hydroxypropyl methylcellulose, carboxymethylcellulose, polyethylene glycol, sucrose, glucose, sorbitol, starch, gum, kaolin, and tragacanth); fillers (e.g., lactose, microcrystalline cellulose, or calcium hydrogen phosphate); lubricants (e.g., calcium, aluminum, zinc, stearic acid, polyethylene glycol, sodium lauryl sulfate, starch, sodium benzoate, L-leucine, magnesium stearate, talc, or silica); disintegrants (e.g., starch, potato starch, sodium starch glycolate, sugars, cellulose derivatives, silica powders); or wetting agents (e.g., sodium lauryl sulphate). The tablets may be coated by methods well known in the art. A coating shell may be present, and common membranes include, but are not limited to, polylactide, polyglycolic acid, polyanhydride, other biodegradable polymers, alginate-polylysine-alginate (APA), alginate-polymethylene-co-guanidine-alginate (A-PMCG-A), hydroymethylacrylate-methyl methacrylate (HEMA-MMA), multilayered HEMA-MMA-MAA, polyacrylonitrilevinylchloride (PAN-PVC), acrylonitrile/sodium methallylsulfonate (AN-69), polyethylene glycol/poly pentamethylcyclopentasiloxane/polydimethylsiloxane (PEG/PD5/PDMS), poly N,N-dimethyl acrylamide (PDMAAm), siliceous encapsulates, cellulose sulphate/sodium alginate/polymethylene-co-guanidine (CS/A/PMCG), cellulose acetate phthalate, calcium alginate, k-carrageenan-locust bean gum gel beads, gellan-xanthan beads, poly(lactide-co-glycolides), carrageenan, starch poly-anhydrides, starch polymethacrylates, polyamino acids, and enteric coating polymers. 
     In some embodiments, the genetically engineered microorganisms are enterically coated for release into the gut or a particular region of the gut, for example, the large intestine. The typical pH profile from the stomach to the colon is about 1-4 (stomach), 5.5-6 (duodenum), 7.3-8.0 (ileum), and 5.5-6.5 (colon). In some diseases, the pH profile may be modified. In some embodiments, the coating is degraded in specific pH environments in order to specify the site of release. In some embodiments, at least two coatings are used. In some embodiments, the outside coating and the inside coating are degraded at different pH levels. 
     Liquid preparations for oral administration may take the form of solutions, syrups, suspensions, or a dry product for constitution with water or other suitable vehicle before use. Such liquid preparations may be prepared by conventional means with pharmaceutically acceptable agents such as suspending agents (e.g., sorbitol syrup, cellulose derivatives, or hydrogenated edible fats); emulsifying agents (e.g., lecithin or acacia); non-aqueous vehicles (e.g., almond oil, oily esters, ethyl alcohol, or fractionated vegetable oils); and preservatives (e.g., methyl or propyl-p-hydroxybenzoates or sorbic acid). The preparations may also contain buffer salts, flavoring, coloring, and sweetening agents as appropriate. Preparations for oral administration may be suitably formulated for slow release, controlled release, or sustained release of the genetically engineered microorganisms described herein. 
     In one embodiment, the genetically engineered microorganisms of the disclosure may be formulated in a composition suitable for administration to pediatric subjects. As is well known in the art, children differ from adults in many aspects, including different rates of gastric emptying, pH, gastrointestinal permeability, etc. (Ivanovska et al., Pediatrics, 134(2):361-372, 2014). Moreover, pediatric formulation acceptability and preferences, such as route of administration and taste attributes, are critical for achieving acceptable pediatric compliance. Thus, in one embodiment, the composition suitable for administration to pediatric subjects may include easy-to-swallow or dissolvable dosage forms, or more palatable compositions, such as compositions with added flavors, sweeteners, or taste blockers. In one embodiment, a composition suitable for administration to pediatric subjects may also be suitable for administration to adults. 
     In one embodiment, the composition suitable for administration to pediatric subjects may include a solution, syrup, suspension, elixir, powder for reconstitution as suspension or solution, dispersible/effervescent tablet, chewable tablet, gummy candy, lollipop, freezer pop, troche, chewing gum, oral thin strip, orally disintegrating tablet, sachet, soft gelatin capsule, sprinkle oral powder, or granules. In one embodiment, the composition is a gummy candy, which is made from a gelatin base, giving the candy elasticity, desired chewy consistency, and longer shelf-life. In some embodiments, the gummy candy may also comprise sweeteners or flavors. 
     In one embodiment, the composition suitable for administration to pediatric subjects may include a flavor. As used herein, “flavor” is a substance (liquid or solid) that provides a distinct taste and aroma to the formulation. Flavors also help to improve the palatability of the formulation. Flavors include, but are not limited to, strawberry, vanilla, lemon, grape, bubble gum, and cherry. 
     In certain embodiments, the genetically engineered microorganisms may be orally administered, for example, with an inert diluent or an assimilable edible carrier. The compound may also be enclosed in a hard or soft shell gelatin capsule, compressed into tablets, or incorporated directly into the subject&#39;s diet. For oral therapeutic administration, the compounds may be incorporated with excipients and used in the form of ingestible tablets, buccal tablets, troches, capsules, elixirs, suspensions, syrups, wafers, and the like. To administer a compound by other than parenteral administration, it may be necessary to coat the compound with, or co-administer the compound with, a material to prevent its inactivation. 
     In another embodiment, the pharmaceutical composition comprising the recombinant bacteria of the invention may be a comestible product, for example, a food product. In one embodiment, the food product is milk, concentrated milk, fermented milk (yogurt, sour milk, frozen yogurt, lactic acid bacteria-fermented beverages), milk powder, ice cream, cream cheeses, dry cheeses, soybean milk, fermented soybean milk, vegetable-fruit juices, fruit juices, sports drinks, confectionery, candies, infant foods (such as infant cakes), nutritional food products, animal feeds, or dietary supplements. In one embodiment, the food product is a fermented food, such as a fermented dairy product. In one embodiment, the fermented dairy product is yogurt. In another embodiment, the fermented dairy product is cheese, milk, cream, ice cream, milk shake, or kefir. In another embodiment, the recombinant bacteria of the invention are combined in a preparation containing other live bacterial cells intended to serve as probiotics. In another embodiment, the food product is a beverage. In one embodiment, the beverage is a fruit juice-based beverage or a beverage containing plant or herbal extracts. In another embodiment, the food product is a jelly or a pudding. Other food products suitable for administration of the recombinant bacteria of the invention are well known in the art. For example, see U.S. 2015/0359894 and US 2015/0238545, the entire contents of each of which are expressly incorporated herein by reference. In yet another embodiment, the pharmaceutical composition of the invention is injected into, sprayed onto, or sprinkled onto a food product, such as bread, yogurt, or cheese. 
     In some embodiments, the composition is formulated for intraintestinal administration, intrajejunal administration, intraduodenal administration, intraileal administration, gastric shunt administration, or intracolic administration, via nanoparticles, nanocapsules, microcapsules, or microtablets, which are enterically coated or uncoated. The pharmaceutical compositions may also be formulated in rectal compositions such as suppositories or retention enemas, using, e.g., conventional suppository bases such as cocoa butter or other glycerides. The compositions may be suspensions, solutions, or emulsions in oily or aqueous vehicles, and may contain suspending, stabilizing and/or dispersing agents. 
     The genetically engineered microorganisms described herein may be administered intranasally, formulated in an aerosol form, spray, mist, or in the form of drops, and conveniently delivered in the form of an aerosol spray presentation from pressurized packs or a nebuliser, with the use of a suitable propellant (e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas). Pressurized aerosol dosage units may be determined by providing a valve to deliver a metered amount. Capsules and cartridges (e.g, of gelatin) for use in an inhaler or insufflator may be formulated containing a powder mix of the compound and a suitable powder base such as lactose or starch. 
     The genetically engineered microorganisms may be administered and formulated as depot preparations. Such long acting formulations may be administered by implantation or by injection, including intravenous injection, subcutaneous injection, local injection, direct injection, or infusion. For example, the compositions may be formulated with suitable polymeric or hydrophobic materials (e.g., as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble derivatives (e.g., as a sparingly soluble salt). 
     In some embodiments, disclosed herein are pharmaceutically acceptable compositions in single dosage forms. Single dosage forms may be in a liquid or a solid form. Single dosage forms may be administered directly to a patient without modification or may be diluted or reconstituted prior to administration. In certain embodiments, a single dosage form may be administered in bolus form, e.g., single injection, single oral dose, including an oral dose that comprises multiple tablets, capsule, pills, etc. In alternate embodiments, a single dosage form may be administered over a period of time, e.g., by infusion. 
     Single dosage forms of the pharmaceutical composition may be prepared by portioning the pharmaceutical composition into smaller aliquots, single dose containers, single dose liquid forms, or single dose solid forms, such as tablets, granulates, nanoparticles, nanocapsules, microcapsules, microtablets, pellets, or powders, which may be enterically coated or uncoated. A single dose in a solid form may be reconstituted by adding liquid, typically sterile water or saline solution, prior to administration to a patient. 
     In other embodiments, the composition can be delivered in a controlled release or sustained release system. In one embodiment, a pump may be used to achieve controlled or sustained release. In another embodiment, polymeric materials can be used to achieve controlled or sustained release of the therapies of the present disclosure (see e.g., U.S. Pat. No. 5,989,463). Examples of polymers used in sustained release formulations include, but are not limited to, poly(2-hydroxy ethyl methacrylate), poly(methyl methacrylate), poly(acrylic acid), poly(ethylene-co-vinyl acetate), poly(methacrylic acid), polyglycolides (PLG), polyanhydrides, poly(N-vinyl pyrrolidone), poly(vinyl alcohol), polyacrylamide, poly(ethylene glycol), polylactides (PLA), poly(lactide-co-glycolides) (PLGA), and polyorthoesters. The polymer used in a sustained release formulation may be inert, free of leachable impurities, stable on storage, sterile, and biodegradable. In some embodiments, a controlled or sustained release system can be placed in proximity of the prophylactic or therapeutic target, thus requiring only a fraction of the systemic dose. Any suitable technique known to one of skill in the art may be used. 
     Dosage regimens may be adjusted to provide a therapeutic response. Dosing can depend on several factors, including severity and responsiveness of the disease, route of administration, time course of treatment (days to months to years), and time to amelioration of the disease. For example, a single bolus may be administered at one time, several divided doses may be administered over a predetermined period of time, or the dose may be reduced or increased as indicated by the therapeutic situation. The specification for the dosage is dictated by the unique characteristics of the active compound and the particular therapeutic effect to be achieved. Dosage values may vary with the type and severity of the condition to be alleviated. For any particular subject, specific dosage regimens may be adjusted over time according to the individual need and the professional judgment of the treating clinician. Toxicity and therapeutic efficacy of compounds provided herein can be determined by standard pharmaceutical procedures in cell culture or animal models. For example, LD 50 , ED 50 , EC 50 , and IC 50  may be determined, and the dose ratio between toxic and therapeutic effects (LD 50 /ED 50 ) may be calculated as the therapeutic index. Compositions that exhibit toxic side effects may be used, with careful modifications to minimize potential damage to reduce side effects. Dosing may be estimated initially from cell culture assays and animal models. The data obtained from in vitro and in vivo assays and animal studies can be used in formulating a range of dosage for use in humans. 
     The ingredients are supplied either separately or mixed together in unit dosage form, for example, as a dry lyophilized powder or water-free concentrate in a hermetically sealed container such as an ampoule or sachet indicating the quantity of active agent. If the mode of administration is by injection, an ampoule of sterile water for injection or saline can be provided so that the ingredients may be mixed prior to administration. 
     The pharmaceutical compositions may be packaged in a hermetically sealed container such as an ampoule or sachet indicating the quantity of the agent. In one embodiment, one or more of the pharmaceutical compositions is supplied as a dry sterilized lyophilized powder or water-free concentrate in a hermetically sealed container and can be reconstituted (e.g., with water or saline) to the appropriate concentration for administration to a subject. In an embodiment, one or more of the prophylactic or therapeutic agents or pharmaceutical compositions is supplied as a dry sterile lyophilized powder in a hermetically sealed container stored between 2° C. and 8° C. and administered within 1 hour, within 3 hours, within 5 hours, within 6 hours, within 12 hours, within 24 hours, within 48 hours, within 72 hours, or within one week after being reconstituted. Cryoprotectants can be included for a lyophilized dosage form, principally 0-10% sucrose (optimally 0.5-1.0%). Other suitable cryoprotectants include trehalose and lactose. Other suitable bulking agents include glycine and arginine, either of which can be included at a concentration of 0-0.05%, and polysorbate-80 (optimally included at a concentration of 0.005-0.01%). Additional surfactants include but are not limited to polysorbate 20 and BRIJ surfactants. The pharmaceutical composition may be prepared as an injectable solution and can further comprise an agent useful as an adjuvant, such as those used to increase absorption or dispersion, e.g., hyaluronidase. 
     In some embodiments, the genetically engineered microorganisms and composition thereof is formulated for intravenous administration, intratumor administration, or peritumor administration. The genetically engineered microorganisms may be formulated as depot preparations. Such long acting formulations may be administered by implantation or by injection. For example, the compositions may be formulated with suitable polymeric or hydrophobic materials (e.g., as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble derivatives (e.g., as a sparingly soluble salt). 
     In another embodiment, the composition can be delivered in a controlled release or sustained release system. In one embodiment, a pump may be used to achieve controlled or sustained release. In another embodiment, polymeric materials can be used to achieve controlled or sustained release of the therapies of the present disclosure (see e.g., U.S. Pat. No. 5,989,463). Examples of polymers used in sustained release formulations include, but are not limited to, poly(2-hydroxy ethyl methacrylate), poly(methyl methacrylate), poly(acrylic acid), poly(ethylene-co-vinyl acetate), poly(methacrylic acid), polyglycolides (PLG), polyanhydrides, poly(N-vinyl pyrrolidone), poly(vinyl alcohol), polyacrylamide, poly(ethylene glycol), polylactides (PLA), poly(lactide-co-glycolides) (PLGA), and polyorthoesters. The polymer used in a sustained release formulation may be inert, free of leachable impurities, stable on storage, sterile, and biodegradable. In some embodiments, a controlled or sustained release system can be placed in proximity of the prophylactic or therapeutic target, thus requiring only a fraction of the systemic dose. Any suitable technique known to one of skill in the art may be used. 
     The genetically engineered bacteria of the invention may be administered and formulated as neutral or salt forms. Pharmaceutically acceptable salts include those formed with anions such as those derived from hydrochloric, phosphoric, acetic, oxalic, tartaric acids, etc., and those formed with cations such as those derived from sodium, potassium, ammonium, calcium, ferric hydroxides, isopropylamine, triethylamine, 2-ethylamino ethanol, histidine, procaine, etc. 
     Methods of Treatment 
     In one aspect of the invention provides methods of treating a disease, disorder and/or a symptom of a disease or disorder described herein. In one aspect aspect of the invention provides methods of treating cancer. In some embodiments, the invention provides methods for reducing, ameliorating, or eliminating one or more symptom(s) associated with cancer. In some embodiments, the cancer is selected from adrenal cancer, adrenocortical carcinoma, anal cancer, appendix cancer, bile duct cancer, bladder cancer, bone cancer (e.g., Ewing sarcoma tumors, osteosarcoma, malignant fibrous histiocytoma), brain cancer (e.g., astrocytomas, brain stem glioma, craniopharyngioma, ependymoma), bronchial tumors, central nervous system tumors, breast cancer, Castleman disease, cervical cancer, colon cancer, rectal cancer, colorectal cancer, endometrial cancer, esophageal cancer, eye cancer, gallbladder cancer, gastrointestinal cancer, gastrointestinal carcinoid tumors, gastrointestinal stromal tumors, gestational trophoblastic disease, heart cancer, Kaposi sarcoma, kidney cancer, largyngeal cancer, hypopharyngeal cancer, leukemia (e.g., acute lymphoblastic leukemia, acute myeloid leukemia, chronic lymphocytic leukemia, chronic myelogenous leukemia), liver cancer, lung cancer, lymphoma (e.g., AIDS-related lymphoma, Burkitt lymphoma, cutaneous T cell lymphoma, Hogkin lymphoma, Non-Hogkin lymphoma, primary central nervous system lymphoma), malignant mesothelioma, multiple myeloma, myelodysplastic syndrome, nasal cavity cancer, paranasal sinus cancer, nasopharyngeal cancer, neuroblastoma, oral cavity cancer, oropharyngeal cancer, osteosarcoma, ovarian cancer, pancreatic cancer, penile cancer, pituitary tumors, prostate cancer, retinoblastoma, rhabdomyosarcoma, rhabdoid tumor, salivary gland cancer, sarcoma, skin cancer (e.g., basal cell carcinoma, melanoma), small intestine cancer, stomach cancer, teratoid tumor, testicular cancer, throat cancer, thymus cancer, thyroid cancer, unusual childhood cancers, urethral cancer, uterine cancer, uterine sarcoma, vaginal cancer, vulvar cancer, Waldenström macrogloblulinemia, and Wilms tumor. In some embodiments, the symptom(s) associated thereof include, but are not limited to, anemia, loss of appetite, irritation of bladder lining, bleeding and bruising (thrombocytopenia), changes in taste or smell, constipation, diarrhea, dry mouth, dysphagia, edema, fatigue, hair loss (alopecia), infection, infertility, lymphedema, mouth sores, nausea, pain, peripheral neuropathy, tooth decay, urinary tract infections, and/or problems with memory and concentration. 
     The method may comprise preparing a pharmaceutical composition with at least one genetically engineered species, strain, or subtype of bacteria described herein, and administering the pharmaceutical composition to a subject in a therapeutically effective amount. The genetically engineered microorganisms may be administered locally, e.g., intratumorally or peritumorally into a tissue or supplying vessel, or systemically, e.g., intravenously by infusion or injection. In some embodiments, the genetically engineered bacteria are administered intravenously, intratumorally, intra-arterially, intramuscularly, intraperitoneally, orally, or topically. In some embodiments, the genetically engineered microorganisms are administered intravenously, i.e., systemically. 
     In certain embodiments, administering the pharmaceutical composition to the subject reduces cell proliferation, tumor growth, and/or tumor volume in a subject. In some embodiments, the methods of the present disclosure may reduce cell proliferation, tumor growth, and/or tumor volume by at least about 10%, 20%, 25%, 30%, 40%, 50%, 60%, 70%, 75%, 80%, 85%, 90%, 95%, or more as compared to levels in an untreated or control subject. In some embodiments, reduction is measured by comparing cell proliferation, tumor growth, and/or tumor volume in a subject before and after administration of the pharmaceutical composition. In some embodiments, the method of treating or ameliorating a cancer in a subject allows one or more symptoms of the cancer to improve by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, or more. 
     Before, during, and after the administration of the pharmaceutical composition, cancerous cells and/or biomarkers in a subject may be measured in a biological sample, such as blood, serum, plasma, urine, peritoneal fluid, and/or a biopsy from a tissue or organ. In some embodiments, the methods may include administration of the compositions of the invention to reduce tumor volume in a subject to an undetectable size, or to less than about 1%, 2%, 5%, 10%, 20%, 25%, 30%, 40%, 50%, 60%, 70%, 75%, 80%, or 90% of the subject&#39;s tumor volume prior to treatment. In other embodiments, the methods may include administration of the compositions of the invention to reduce the cell proliferation rate or tumor growth rate in a subject to an undetectable rate, or to less than about 1%, 2%, 5%0, 10%, 20%, 25%, 30%, 40%, 50%, 60%, 70%, 75%, 80%, or 90% of the rate prior to treatment. 
     The genetically engineered bacteria may be destroyed, e.g., by defense factors in tissues or blood serum (Sonnenborn et al. (2009) Microbial Ecology in Health and Disease 21: 122-58), or by activation of a kill switch, several hours or days after administration. Thus, the pharmaceutical composition comprising the genetically engineered bacteria comprising a heterologous gene encoding a substrate transporter may be re-administered at a therapeutically effective dose and frequency. In alternate embodiments, the genetically engineered bacteria are not destroyed within hours or days after administration and may propagate and colonize the tumor. 
     The pharmaceutical composition may be administered alone or in combination with one or more additional therapeutic agents, e.g., a chemotherapeutic drug such a methotrexate. An important consideration in selecting the one or more additional therapeutic agents is that the agent(s) should be compatible with the genetically engineered bacteria of the invention, e.g., the agent(s) must not kill the bacteria. In some studies, the efficacy of anticancer immunotherapy, e.g., CTLA-4 or PD-1 inhibitors, requires the presence of particular bacterial strains in the microbiome (Ilda et al., 2013; Vetizou et al., 2015; Sivan et al., 2015). In some embodiments, the pharmaceutical composition is administered with one or more commensal or probiotic bacteria, e.g.,  Bifidobacterium  or  Bacteroides.    
     In some embodiments, the genetically engineered microorganisms may be administered as part of a regimen, which includes other treatment modalities or combinations of other modalities. Non-limiting examples of these modalities or agents are conventional therapies (e.g., radiotherapy, chemotherapy), other immunotherapies, stem cell therapies, and targeted therapies, (e.g., BRAF or vascular endothelial growth factor inhibitors; antibodies or compounds), bacteria described herein, and oncolytic viruses. Therapies also include related to antibody-immune engagement, including Fc-mediated ADCC therapies, therapies using bispecific soluble scFvs linking cytotoxic T cells to tumor cells (e.g., BiTE), and soluble TCRs with effector functions. Immunotherapies include vaccines (e.g., viral antigen, tumor associated antigen, neoantigen, or combinations thereof), checkpoint inhibitors, cytokine therapies, adoptive cellular therapy (ACT). ACT includes but is not limited to, tumor infiltrating lymphocyte (TIL) therapies, native or engineered TCR or CAR-T therapies, natural killer cell therapies, and dendritic cell vaccines or other vaccines of other antigen presenting cells. Targeted therapies include antibodies and chemical compounds, and include for example antiangiogenic strategies and BRAF inhibition. 
     The immunostimulatory activity of bacterial DNA is mimicked by synthetic oligodeoxynucleotides (ODNs) expressing unmethylated CpG motifs (see, e.g., Bode et al. (2011) Expert Rev Vaccines 10(4): 499-511). CpG DNA as a vaccine adjuvant. When used as vaccine adjuvants, CpG ODNs improve the function of professional antigen-presenting cells and boost the generation of humoral and cellular vaccine-specific immune responses. In some embodiments, CpG can be administered in combination with the genetically engineered baceteria of the invention. 
     In one embodiment, the genetically engineered micororganisms are administered in combination with tumor cell lysates. 
     The dosage of the pharmaceutical composition and the frequency of administration may be selected based on the severity of the symptoms and the progression of the cancer. The appropriate therapeutically effective dose and/or frequency of administration can be selected by a treating clinician. 
     Treatment In Vivo 
     The genetically engineered bacteria may be evaluated in vivo, e.g., in an animal model. Any suitable animal model of a disease or condition associated with cancer may be used, e.g., a tumor syngeneic or xenograft mouse models (see, e.g., Yu et al., 2015). The genetically engineered bacteria may be administered to the animal systemically or locally, e.g., via oral administration (gavage), intravenous, or subcutaneous injection or via intratumoral injection, and treatment efficacy determined, e.g., by measuring tumor volume. 
     Non-limiting examples of animal models include mouse models, as described in Dang et al., 2001, Heap et al., 2014 and Danino et al., 2015). 
     Pre-clinical mouse models determine which immunotherapies and combination immunotherapies will generate the optimal therapeutic index (maximal anti-tumor efficacy and minimal immune related adverse events (irAEs)) in different cancers. 
     Implantation of cultured cells derived from various human cancer cell types or a patient&#39;s tumor mass into mouse tissue sites has been widely used for generations of cancer mouse models (xenograft modeling). In xenograft modeling, human tumors or cell lines are implanted either subcutaneously or orthotopically into immune-compromised host animals (eg, nude or SCID mice) to avoid graft rejection. Because the original human tumor microenvironment is not recapitulated in such models, the activity of anti-cancer agents that target immune modulators may not be accurately measured in these models, making mouse models with an intact immune system more desirable. 
     Accordingly, implantation of murine cancer cells in a syngeneic immunocompetent host (allograft) are used to generate mouse models with tumor tissues derived from the same genetic background as a given mouse strain. In syngeneic models, the host immune system is normal, which may more closely represent the real life situation of the tumor&#39;s micro-environment. The tumor cells or cancer cell lines are implanted either subcutaneously or orthotopically into the syngeneic immunocompetent host animal (e.g, mouse). Representative murine tumor cell lines, which can be used in syngeneic mouse models for immune checkpoint benchmarking include, but are not limited to the cell lines listed in Table 32. 
     
       
         
           
               
             
               
                 TABLE 32 
               
             
            
               
                   
               
               
                 Selected cell lines for use in syngeneic mouse models 
               
            
           
           
               
               
            
               
                 Cancer Types 
                 Cell LInes 
               
               
                   
               
               
                 Bladder 
                 MBT-2 
               
               
                 Breast 
                 4T1, EMT6, JC 
               
               
                 Colon 
                 CT-26, Colon26, MC38 
               
               
                 Kidney 
                 Renca 
               
               
                 Leukemia 
                 L1210, C1498 
               
               
                 Mastocytoma P815 
                 P815 
               
               
                 Neuroblastoma Neuro -2-A 
                 Neuro-2a 
               
               
                 Myeloma 
                 MPC-11 
               
               
                 Liver 
                 H22 
               
               
                 Lung 
                 LL/2, KLN205 
               
               
                 Lymphoma 
                 A20, EL4, P388D1, L15178-R, E.G7-OVA 
               
               
                 Melanoma 
                 B16-BL6, B16-F10, S91 
               
               
                 Pancreatic 
                 Pan02 
               
               
                 Prostate 
                 RM-1 
               
               
                 Fibrosarcoma 
                 WHI-164 
               
               
                 Plasmacytoma 
                 J558 
               
               
                   
               
            
           
         
       
     
     Additional cell lines include, but are not limited to those in Table 33, which are described with respect to CTLA-4 benchmarking in Joseph F. Grosso and Maria N. Jure-Kunkel et al., 2013, the contents of which is herein incorporated by reference in its entirety. 
     
       
         
           
               
             
               
                 TABLE 33 
               
             
            
               
                   
               
               
                 Murine cell lines and CTLA-4 antibodies 
               
               
                 for syngenic mouse models 
               
            
           
           
               
               
               
            
               
                 Murine 
                 Tumor type/Mouse 
                 Anti-CTLA-4 Ab/Tx 
               
               
                 Tumor 
                 strain 
                 regimen 
               
               
                   
               
               
                 Brain 
                 SMA-560 
                 9H10; d7* (100 μg), d10 
               
               
                   
                 Glioma/Vm/Dk) 
                 (50 μg), d13 (50 μg) post- 
               
               
                   
                   
                 implant 
               
               
                   
                 GL-261 
                 9H10; d0 (100 μg), d3 (50 
               
               
                   
                 Glioma/C57BL/6) 
                 μg), d6 (50 μg), 
               
               
                 Ovarian 
                 OV-HM/C57BL/6 x 
                 UC10-4F10-11; 1 mg/mouse 
               
               
                   
                 C3H/He) 
               
               
                 Bladder 
                 MB49/C57BL/6 
                 9D9; d7, d10, d13 (200 μg 
               
               
                   
                   
                 each) 
               
               
                 Sarcoma 
                 Meth-A/BALB/c 
                 9H10; d6 (100 μg, d9 (50 
               
               
                   
                   
                 μg), d12 (50 μg) 
               
               
                   
                 MC38, 11A1 
                 9H10; d14 (100 μg), d17 
               
               
                   
                 BALB/c, C57BL/6 
                 (50 μg), d20 (50 μg) 
               
               
                 Breast 
                 TSA/BALB/c (62 
                 9H10; d12, d14, d16 (200 
               
               
                   
                   
                 μg each) 
               
               
                   
                 4T1 BALB/c 
                 9H10; d14, d18, d21 (200 
               
               
                   
                   
                 μg each) 
               
               
                   
                 4T1 BALB/c 
                 9H10; d14, d18; d21 (200 
               
               
                   
                   
                 μg each) 
               
               
                   
                 4T1 BALB/c 
                 UC10-4F10-11; d7, d11, 
               
               
                   
                   
                 d15, d19 (100 μg each) 
               
               
                   
                 SM1/BALB/c 
                 9H10; d4, d7, d19 (100 μg 
               
               
                   
                   
                 each) 
               
               
                   
                 EMT6/BALB/c 
                 UC10-4F10-11; d4, d8, d12 
               
               
                   
                   
                 (400 μg each) Ixa: d3, d7, 
               
               
                   
                   
                 d11 
               
               
                 Colon 
                 MC38/C57BL/6 
                 UC10-4F10-11; d7, d11, 
               
               
                   
                   
                 d16 (100 μg each) 
               
               
                   
                 MC38 
                 K4G4, L1B11, L3D10 
               
               
                   
                 CT26 BALB/c 
                 9H10; d10 (100 μg), d13 
               
               
                   
                   
                 (50 μg), d15 (50 μg) 
               
               
                   
                 CT26 BALB/c 
                 UC10-4F10-11; d5, d9, d13 
               
               
                   
                   
                 (400 μg each) Ixa: d4, d8, 
               
               
                   
                   
                 d12 
               
               
                   
                 MC38/C57BL/6 
                 UC10-4F10-11; d14, d21 
               
               
                   
                   
                 d28 (800 μg each) 
               
               
                 Lymphoma 
                 BW5147.3/AKR 
                 UC10-4F10-11; d-1 (250 
               
               
                   
                   
                 μg), d0 (250 μg), d4 [100 
               
               
                   
                   
                 μg), d8 (100 μg), dl2 (100 
               
               
                   
                   
                 μg) 
               
               
                   
                 EL4/C57BL/6 
                 9H10; d3, d5 (100 μg each) 
               
               
                 Fibrosarcoma 
                 SA1N/A/J 
                 9H10; every 4 days (200 μg 
               
               
                   
                   
                 each) 
               
               
                   
                 SA1N 
                 UC10-4F10-11; d12, d16 
               
               
                   
                   
                 d20 (400 μg each) Ixa: d11, 
               
               
                   
                   
                 d15, d15 
               
               
                 Prostata 
                 TRAMP 
                 9H10; d7, d10, d13 (100μg 
               
               
                   
                 C1[pTC1]/C57BU6 
                 each) 
               
               
                   
                 TRAMP 
                 9H10; d4, d7, d10 (100 μg 
               
               
                   
                 C2/C57BL/6 
                 each) 
               
               
                   
                 TRAMP/C57BL 
                 9H10; 14-16 week old mice 
               
               
                   
                   
                 d7, d10, d16 post-tR tx (100 
               
               
                   
                   
                 μg each) 
               
               
                   
                 TRAMP 
                 9H10; d29, d33, d40, d50 
               
               
                   
                 C2/C57BL/6 
                 (100 μg each) d29 = 1d post- 
               
               
                   
                   
                 cryoablation 
               
               
                 Melanoma 
                 B16/C57BL/6 
                 9H10; d0, d3, d6 (200 μg 
               
               
                   
                   
                 each) 
               
               
                   
                 B16/C57BL/6 
                 9H10; d6 (100 μg), d8 [50 
               
               
                   
                   
                 μg), d10 (50 μg) 
               
               
                   
                 B16/C57BL/6 
                 9D9; d3, d6, d9 
               
               
                   
                 B16/C57BL/6 
                 9H10; d3, d6, d9 (100 μg 
               
               
                   
                   
                 each) 
               
               
                   
                 B16.F10/C57BL/6 
                 9H10; d5 (100 μg), d7 (50 
               
               
                   
                   
                 μg), d9 (50 μg) 
               
               
                 Lung 
                 M109/BALB/c 
                 UC10-4F10-11; d4, d8, 
               
               
                   
                   
                 d12(400 μg each) Ixa: d3, 
               
               
                   
                   
                 d7, d11 
               
               
                 Plasmacytoma 
                 MOPC-315/BALB/c 
                 UC10-4F10-11; 20 mm 
               
               
                   
                 ANnCrlBr 
                 tumors tx daily for 10 days 
               
               
                   
                   
                 (100 μg each) 
               
               
                   
               
            
           
         
       
     
     For tumors derived from certain cell lines, ovalbumin can be added to further stimulate the immune response, thereby increasing the response baseline level. 
     Examples of mouse strains that can be used in syngeneic mouse models, depending on the cell line include C57BL/6, FVB/N, Balb/c, C3H, HeJ, C3H/HeJ, NOD/ShiLT, A/J, 129S1/SvlmJ, NOD. Additionally, several further genetically engineered mouse strains have been reported to mimic human tumorigenesis at both molecular and histologic levels. These genetically engineered mouse models also provide excellent tools to the field and additionally, the cancer cell lines derived from the invasive tumors developed in these models are also good resources for cell lines for syngeneic tumor models Examples of genetically engineered strains are provided in Table 34. 
     
       
         
           
               
             
               
                 TABLE 34 
               
             
            
               
                   
               
               
                 Exemplary genetic engineered mouse strains of interest 
               
            
           
           
               
               
               
            
               
                   
                 Strain 
                 Predicted 
               
               
                 Animal strain 
                 background 
                 cancer type 
               
               
                   
               
               
                 C57BL/6-Tg(TRAMP)8247Ng/JNju 
                 C57BL/6 
                 Prostate cancer 
               
               
                 FVB/N-Tg MMTV-PyVT)634Mul/Jnju 
                 FVB/N 
                 Breast cancer 
               
               
                 C57BL/6J-Apc Min /JNju 
                 C57BL/6 
                 Colorectal cancer 
               
               
                 STOCK Ptch1 tm1Mps /JNju 
                 C57BL/6JNju 
                 Medulloblastoma 
               
               
                 NOD-Prkdc em26Cd52 Il2rg em26Cd22 Nju 
                 NOD/ShiLt 
                 Not specific 
               
               
                 C57BL/6J-Apc Min /JNju 
                 C57BL/6 
                 Colorectal cancer 
               
               
                 BALB/cJNju 
                 BALB/c 
                 Lung cancer 
               
               
                 C3H/HeJNju (Urethane 
                 C3H/HeJ 
                 Lung cancer 
               
               
                 induced lung cancer model) 
               
               
                 A/JNju 
                 A/J 
                 Lung cancer 
               
               
                 A/Jnju (Urethane induced 
                 A/J 
                 Lung cancer 
               
               
                 lung cancer model) 
               
               
                 C3H/HeJSlac 
                 C3H/HeJ 
                 Lung cancer 
               
               
                 129S1/SvImJNju (Urethane 
                 129S1/SvImJ 
                 Lung cancer 
               
               
                 induced lung cancer model) 
               
               
                 Kras LSL-G12D/WT   
                 C57BL/6 
                 Lung cancer 
               
               
                 Kras LSL-G12D/WT ; P53 KO/KO   
                 C57BL/6 
                 Lung cancer 
               
               
                 Pdx1-cre; Kras LSL-G12D/WT ; P53 KO/ KO 
                 C57BL/6 
                 Pancreatic cancer 
               
               
                 Kras LSL-G12D/WT ; P16 KO/KO   
                 C57BL/6; 
                 Pancreaticc cancer; 
               
               
                   
                 FVB/N 
                 Lung cancer 
               
               
                 Kras LSL-G12D/WT ; PTEN CKO/CKO   
                 C57BL/6 
                 Ovarian cancer; 
               
               
                   
                   
                 Prostate cancer; Brain 
               
               
                   
                   
                 cancer 
               
               
                 Pbsn-cre; Kras LSL-G12D/WT ; PTEN CKO/CKO   
                 C57BL/6 
                 Prostate cancer 
               
               
                 P53 KO/KO ; PTEN CKO/CKO   
                 C57BL/6 
                 Prostate cancer 
               
               
                 Pbsn-cre; PTEN CKO/CKO   
                 C57BL/6 
                 Prostate cancer 
               
               
                 NOD 
                 NOD 
                 Leukemia 
               
               
                 B6.Cg-Tg(IghMyc)22Bri/JNju 
                 C57BL/6 
                 B cell Lymphoma 
               
               
                 PTEN CKO/CKO   
                 C57BL/6 
                 Ovarian cancer 
               
               
                   
                   
                 (Female); Prostate 
               
               
                   
                   
                 cancer (Male); Tes/s 
               
               
                   
                   
                 cancer (Male) 
               
               
                 NASH-HCC (Streptozotocin and high-fat 
                 C57BL/6 
                 Hepatocellular 
               
               
                 diet induced liver cancer model) 
                   
                 Carcinoma 
               
               
                 BALB/c nude 
                 BALB/c 
                 Not specific 
               
               
                 C3H/He 
                 C3H/He 
                 Hepatocellular 
               
               
                   
                   
                 Carcinoma 
               
               
                 B6N 
                 C57BL/6 
                 Not specific 
               
               
                 B6/N-Akr1c12 tm1a Nju 
                 C57BL/6 
                 Not specific 
               
               
                 P53 null from VitalStar 
                 C57BL/6 
                 Not specific 
               
               
                 P53 null from VitalStar 
                 C57BL/6 
                 Not specific 
               
               
                 P53 null from VitalStar 
                 C57BL/6 
                 Not specific 
               
               
                 Pdx1-cre; Kras LSL-G12D/WT ; P53 KO/ KO 
                 C57BL/6 
                 Pancrea/c cancer 
               
               
                 Kras LSL-G12D/WT ; P16 KO/KO   
                 C57BL/6; 
                 Pancrea/c cancer; Lung 
               
               
                   
                 FVB/N 
                 cancer 
               
               
                 Kras LSL-G12D/WT ; PTEN CKO/CKO   
                 C57BL/6 
                 Ovarian cancer; 
               
               
                 Kras LSL-G12D/WT ; PTEN CKO/CKO   
                 C57BL/6 
                 Prostate cancer; 
               
               
                 Kras LSL-G12D/WT ; PTEN CKO/CKO   
                 C57BL/6 
                 Brain cancer 
               
               
                 Pbsn-cre; Kras LSL-G12D/WT ; PTEN CKO/CKO   
                 C57BL/6 
                 Prostate cancer 
               
               
                 P53 KO/KO ; PTEN CKO/CKO   
                 C57BL/6 
                 Prostate cancer 
               
               
                 Pbsn-cre; PTEN CKO/CKO   
                 C57BL/6 
                 Prostate cancer 
               
               
                 Kras LSL-G12D/WT   
                 C57BL/6 
                 Lung cancer 
               
               
                 NOD 
                 NOD 
                 Leukemia 
               
               
                 B6.Cg-Tg(IghMyc)22Bri/JNju 
                 C57BL/6 
                 B cell Lymphoma 
               
               
                 PTEN CKO/CKO   
                 C57BL/6 
                 Ovarian cancer 
               
               
                   
                   
                 (Female); Prostate 
               
               
                   
                   
                 cancer (Male); Tes/s 
               
               
                   
                   
                 cancer (Male) 
               
               
                 NASH-HCC (Streptozotocin and high-fat 
                 C57BL/6 
                 Hepatocellular 
               
               
                 diet induced liver cancer model) 
                   
                 Carcinoma 
               
               
                 BALB/c nude 
                 BALB/c 
                 Not specific 
               
               
                 C3H/He 
                 C3H/He 
                 Hepatocellular 
               
               
                   
                   
                 Carcinoma 
               
               
                 B6N 
                 C57BL/6 
                 Not specific 
               
               
                 B6/N-Akr1c12 tm1a Nju 
                 C57BL/6 
                 Not specific 
               
               
                 P53 null from VitalStar 
                 C57BL/6 
                 Not specific 
               
               
                 P53 null from VitalStar 
                 C57BL/6 
                 Not specific 
               
               
                 P53 null from VitalStar 
                 C57BL/6 
                 Not specific 
               
               
                 Kras LSL-G12D/WT ; P53 KO/KO   
                 C57BL/6 
                 Not specific 
               
               
                   
               
            
           
         
       
     
     Often antibodies directed against human proteins do not detect their murine counterparts. In studying antibodies, including those directed against human immune checkpoint molecules, it is necessary to take this in consideration. For example, Ipilimumab did not show cross-reactivity with or binding to CTLA-4 from rats, mice or rabbits. 
     In some cases, mice transgenic for the gene of interest can used to overcome this issue, as was done for ipilimumab. However, in syngeneic mouse models without a human transgene, mouse protein reactive antibodies must be used to test therapeutic antibody strategies. For example, suitable CTLA-4 antibodies for expression by the genetically engineered bacteria of interest include, but are not limited to, 9H10, UC10-4F10-11, 9D9, and K4G4 (Table 33). 
     More recently, “humanized” mouse models have been developed, in which immunodeficient mice are reconstituted with a human immune system, and which have helped overcome issues relating to the differences between the mouse and human immune systems, allowing the in vivo study of human immunity. Severely immunodeficient mice which combine the IL2 receptor null and the severe combined immune deficiency mutation (scid) (NOD-scid IL2Rgnull mice) lack mature T cells, B cells, or functional NK cells, and are deficient in cytokine signaling. These mice can be engrafted with human hematopoietic stem cells and peripheral-blood mononuclear cells. CD34+ hematopoietic stem cells (hu-CD34) are injected into the immune deficient mice, resulting in multi-lineage engraftment of human immune cell populations including very good T cell maturation and function for long-term studies. This model has a research span of 12 months with a functional human immune system displaying T-cell dependent inflammatory responses with no donor cell immune reactivity towards the host. Patient derived xenografts can readily be implanted in these models and the effects of immune modulatory agents studied in an in vivo setting more reflective of the human tumor microenvironment (both immune and non-immune cell-based) (Baia et al., 2015). 
     Human cell lines of interest for use in the humanized mouse models include but are not limited to HCT-116 and HT-29 colon cancer cell lines. 
     A rat F98 glioma model and the utility of spontaneous canine tumors, as described in Roberts et al 2014, the contents of each of which are herein incorporated by reference in their entireties. Locally invasive tumors generated by implantation of F98 rat glioma cells engineered to express luciferase were intratumorally injected with  C. novyi -NT spores, resulting in germination and a rapid fall in luciferase activity.  C. novyi -NT germination was demonstrated by the appearance of vegetative forms of the bacterium. In these studies,  C. novyi -NT precisely honed to the tumor sparing neighboring cells. 
     Canine soft tissue sarcomas for example are common in many breeds and have clinical, histopathological, and genetically features similar to those in humans (Roberts et al, 2014; Staedtke et al., 2015), in particular, in terms of genetic alterations and spectrum of mutations. Roberts et al. conducted a study in dogs, in which  C. novyi -NT spores were intrtatumorally injected (1×10 8    C. novyi -NT spores) into spontaneously occurring solid tumors in one to 4 treatment cycles and followed for 90 days. A potent inflammatory response was observed, indicating that the intrattumoral injections mounted an innate immune response. 
     In some embodiments, the genetically engineered microorganisms of the invention are administered systemically, e.g., orally, subcutaneously, intraveneously or intratumorally into any of the models described herein to assess anti-tumor efficacy and any treatment related adverse side effects. 
     EXAMPLES 
     Example 1. Phenylalanine Transporter—Integration of PheP into the Bacterial Chromosome 
     In some embodiments, it may be advantageous to increase phenylalanine transport into the cell, thereby enhancing phenylalanine metabolism. Therefore, a second copy of the native high affinity phenylalanine transporter, PheP, driven by an inducible promoter, was inserted into the Nissle genome through homologous recombination. Organization of the construct is shown in  FIG. 4 . The pheP gene was placed downstream of the Ptet promoter, and the tetracycline repressor, TetR, was divergently transcribed (see, e.g.,  FIG. 4 ). This sequence was synthesized by Genewiz (Cambridge, Mass.). To create a vector capable of integrating the synthesized TetR-PheP construct into the chromosome, Gibson assembly was first used to add 1000 bp sequences of DNA homologous to the Nissle lacZ locus into the R6K origin plasmid pKD3. This targets DNA cloned between these homology arms to be integrated into the lacZ locus in the Nissle genome. Gibson assembly was used to clone the TetR-PheP fragment between these arms. PCR was used to amplify the region from this plasmid containing the entire sequence of the homology arms, as well as the pheP sequence between them. This PCR fragment was used to transform electrocompetent Nissle-pKD46, a strain that contains a temperature-sensitive plasmid encoding the lambda red recombinase genes. After transformation, cells were grown for 2 hrs before plating on chloramphenicol at 20 μg/mL at 37° C. Growth at 37° C. cures the pKD46 plasmid. Transformants containing anhydrous tetracycline (ATC)-inducible pheP were lac-minus (lac-) and chloramphenicol resistant. 
     Example 2. Effect of the Phenylalanine Transporter on Phenylalanine Degradation 
     To determine the effect of the phenylalanine transporter on phenylalanine degradation, phenylalanine degradation and trans-cinnamate accumulation achieved by genetically engineered bacteria expressing PAL1 or PAL3 on low-copy (LC) or high-copy (HC) plasmids in the presence or absence of a copy of pheP driven by the Tet promoter integrated into the chromosome was assessed. 
     For in vitro studies, all incubations were performed at 37° C. Cultures of  E. coli  Nissle transformed with a plasmid comprising the PAL gene driven by the Tet promoter were grown overnight and then diluted 1:100 in LB. The cells were grown with shaking (200 rpm) to early log phase. Anhydrous tetracycline (ATC) was added to cultures at a concentration of 100 ng/mL to induce expression of PAL, and bacteria were grown for another 2 hrs. Bacteria were then pelleted, washed, and resuspended in minimal media, and supplemented with 4 mM phenylalanine. Aliquots were removed at 0 hrs, 2 hrs, and 4 hrs for phenylalanine quantification ( FIG. 8A ), and at 2 hrs and 4 hrs for cinnamate quantification ( FIG. 8B ), by mass spectrometry, as described in Examples 24-26. As shown in  FIG. 8 , expression of pheP in conjunction with PAL significantly enhances the degradation of phenylalanine as compared to PAL alone or pheP alone. Notably, the additional copy of pheP permitted the complete degradation of phenylalanine (4 mM) in 4 hrs ( FIG. 8A ).  FIG. 8B  depicts cinnamate levels in samples at 2 hrs and 4 hrs post-induction. Since cinnamate production is directly correlated with phenylalanine degradation, these data suggest that phenylalanine disappearance is due to phenylalanine catabolism, and that cinnamate may be used as an alternative biomarker for strain activity. PheP overexpression improves phenylalanine metabolism in engineered bacteria. 
     In conclusion, in conjunction with pheP, even low-copy PAL-expressing plasmids are capable of almost completely eliminating phenylalanine from a test sample ( FIGS. 8A and 8B ). Furthermore, without wishing to be bound by theory, in some embodiments, that incorporate pheP, there may be additional advantages to using a low-copy PAL-expressing plasmid in conjunction in order to enhance the stability of PAL expression while maintaining high phenylalanine metabolism, and to reduce negative selection pressure on the transformed bacterium. In alternate embodiments, the phenylalanine transporter is used in conjunction with a high-copy PAL-expressing plasmid. 
     Example 3. Phenylalanine Degradation in Recombinant  E. coli  with and without pheP Overexpression 
     The SYN-PKU304 and SYN-PKU305 strains contain low-copy plasmids harboring the PAL3 gene, and a copy of pheP integrated at the lacZ locus. The SYN-PKU308 and SYN-PKU307 strains also contain low-copy plasmids harboring the PAL3 gene, but lack a copy of pheP integrated at the lacZ locus. In all four strains, expression of PAL3 and pheP (when applicable) is controlled by an oxygen level-dependent promoter. 
     To determine rates of phenylalanine degradation in engineered  E. coli  Nissle with and without pheP on the chromosome, overnight cultures of SYN-PKU304 and SYN-PKU307 were diluted 1:100 in LB containing ampicillin, and overnight cultures of SYN-PKU308 and SYN-PKU305 were diluted 1:100 in LB containing kanamycin. All strains were grown for 1.5 hrs before cultures were placed in a Coy anaerobic chamber supplying 90% N 2 , 5% CO 2 , and 5% H 2 . After 4 hrs of induction, bacteria were pelleted, washed in PBS, and resuspended in 1 mL of assay buffer. Assay buffer contained M9 minimal media supplemented with 0.5% glucose, 8.4% sodium bicarbonate, and 4 mM of phenylalanine. 
     For the activity assay, starting counts of colony-forming units (cfu) were quantified using serial dilution and plating. Aliquots were removed from each cell assay every 30 min for 3 hrs for phenylalanine quantification by mass spectrometry. Specifically, 150 μL of bacterial cells were pelleted and the supernatant was harvested for LC-MS analysis, with assay media without cells used as the zero-time point.  FIG. 10  shows the observed phenylalanine degradation for strains with pheP on the chromosome (SYN-PKU304 and SYN-PKU305; left), as well as strains lacking pheP on the chromosome (SYN-PKU308 and SYN-PKU307; right). These data show that pheP overexpression is important in order to increase rates of phenylalanine degradation in synthetic probiotics. 
     Strains Used in the Experiments 
       
     
       
         
           
               
               
               
               
             
               
                   
               
               
                   
                   
                   
                 PAL 
               
               
                   
                   
                   
                 Activity 
               
               
                   
                   
                   
                 (umol/hr/ 
               
               
                 Strain Name 
                 Strain Name 
                 Genotype 
                 10{circumflex over ( )}9 cells) 
               
               
                   
               
             
            
               
                 SYN025 
                 SYN-PKU101 
                 Low copy pSC101- 
                 ND 
               
               
                   
                   
                 Ptet::PAL1, ampicillin 
               
               
                   
                   
                 resistant 
               
               
                 SYN026 
                 SYN-PKU102 
                 High copy pColE1- 
                 ND 
               
               
                   
                   
                 Ptet::PAL1, ampicillin 
               
               
                   
                   
                 resistant, 
               
               
                 SYN065 
                 SYN-PKU201 
                 Low copy pSC101- 
                 ND 
               
               
                   
                   
                 Ptet::PAL3, ampicillin 
               
               
                   
                   
                 resistant 
               
               
                 SYN063 
                 SYN-PKU202 
                 High copy pColE1- 
                 ND 
               
               
                   
                   
                 Ptet::PAL3, ampicillin 
               
               
                   
                   
                 resistant, 
               
               
                 SYN107 
                 SYN-PKU203 
                 lacZ::Ptet-pheP::cam 
                 0 
               
               
                 SYN108 
                 SYN-PKU401 
                 Low copy pSC101- 
                 1.1 
               
               
                   
                   
                 Ptet::PAL1, ampicillin 
               
               
                   
                   
                 resistant, chromosomal 
               
               
                   
                   
                 lacZ::Ptet-pheP::cam 
               
               
                 SYN109 
                 SYN-PKU402 
                 High copy pColE1- 
                 0.8 
               
               
                   
                   
                 Ptet::PAL1, ampicillin 
               
               
                   
                   
                 resistant, chromosomal 
               
               
                   
                   
                 lacZ::Ptet-pheP::cam 
               
               
                 SYN110 
                 SYN-PKU302 
                 Low Copy pSC101- 
                 2.2 
               
               
                   
                   
                 Ptet::PAL3, ampicillin 
               
               
                   
                   
                 resistant; chromosomal 
               
               
                   
                   
                 lacZ::Ptet-pheP::cam 
               
               
                 SYN111 
                 SYN-PKU303 
                 High copy pColE1- 
                 7.1 
               
               
                   
                   
                 Ptet::PAL3, ampicillin 
               
               
                   
                   
                 resistant, chromosomal 
               
               
                   
                   
                 lacZ::Ptet-pheP::cam 
               
               
                 SYN340 
                 SYN-PKU304 
                 Low Copy pSC101- 
                 3 
               
               
                   
                   
                 PfnrS::PAL3, ampicillin 
               
               
                   
                   
                 resistant; chromosomal 
               
               
                   
                   
                 lacZ::PfnrS-pheP::cam 
               
               
                 SYN958 
                 SYN-PKU305 
                 Low Copy pSC101- 
                 3 
               
               
                   
                   
                 PfnrS::PAL3, 
               
               
                   
                   
                 kanamycin resistant; 
               
               
                   
                   
                 chromosomal 
               
               
                   
                   
                 lacZ::PfnrS-pheP::cam 
               
               
                 SYN959 
                 SYN-PKU307 
                 Low Copy pSC101- 
                 0.3 
               
               
                   
                   
                 PfnrS::PAL3, ampicillin 
               
               
                   
                   
                 resistant; 
               
               
                 SYN837 
                 SYN-PKU308 
                 Low Copy pSC101- 
                 0.3 
               
               
                   
                   
                 PfnrS::PAL3, 
               
               
                   
                   
                 kanamycin resistant; 
               
               
                   
               
            
           
         
       
     
     Example 4. Construction of Plasmids Encoding Branched Chain Amino Acid Importers and Branched Chain Amino Acid Catabolism Enzyme 
     The kivD gene of  Lactococcus lactis  IFPL730 was synthesized (Genewiz), fused to the Tet promoter, cloned into the high-copy plasmid pUC57-Kan by Gibson assembly and transformed into  E. coli  DH5α to generate the plasmid pTet-kivD. The bkd operon of  Pseudomonas aeruginosa  PAO1 fused to the Tet promoter was synthesized (Genewiz) and cloned into the high-copy plasmid pUC57-Kan to generate the plasmid pTet-bkd. The bkd operon of  Pseudomonas aeruginosa  PAO1 fused to the ldh gene from PA01 and the Tet promoter was synthesized (Genewiz) and cloned into the high-copy plasmid pUC57-Kan to generate the plasmid pTet-ldh-bkd. The livKHMGF operon from  E. coli  Nissle fused to the Tet promoter was synthesized (Genewiz), cloned into the pKIKO-lacZ plasmid by Gibson assembly and transformed into  E. coli  PIR1 as described in Example 3 to generate the pTet-livKHMGF. 
     Example 5. Generation of Recombinant Bacterial Cell Comprising a Genetic Modification that Reduces Export of a Branched Chain Amino Acid 
       E. coli  Nissle was transformed with the pKD46 plasmid encoding the lambda red proteins under the control of an arabinose-inducible promoter as follows. An overnight culture of  E. coli  Nissle grown at 37° C. was diluted 1:100 in 4 mL of lysogeny broth (LB) and grown at 37° C. until it reached an OD 600  of 0.4-0.6. 1 mL of the culture was then centrifuged at 13,000 rpm for 1 min in a 1.5 mL microcentrifuge tube and the supernatant was removed. The cells were then washed three times in pre-chilled 10% glycerol and resuspended in 40 uL pre-chilled 10% glycerol. The electroporator was set to 1.8 kV. 1 uL of a pKD46 miniprep was added to the cells, mixed by pipetting, and pipetted into a sterile, chilled 1 mm cuvette. The cuvette was placed into the sample chamber, and the electric pulse was applied. 500 uL of room-temperature SOC media was immediately added, and the mixture was transferred to a culture tube and incubated at 30° C. for 1 hr. The cells were spread out on an LB plate containing 100 ug/mL carbenicillin and incubated at 30° C. 
     A ΔleuE deletion construct with 77 bp and a 100 bp flanking leuE homology regions and a kanamycin resistant cassette flanked by FRT recombination site was generated by PCR, column-purified and transformed into  E. coli  Nissle pKD46 as follows. An overnight culture of  E. coli  Nissle pKD46 grown in 100 ug/mL carbenicillin at 30° C. was diluted 1:100 in 5 mL of LB supplemented with 100 ug/mL carbenicillin, 0.15% arabinose and grown until it reaches an OD 600  of 0.4-0.6. The bacteria were aliquoted equally in five 1.5 mL microcentrifuge tubes, centrifuged at 13,000 rpm for 1 min and the supernatant was removed. The cells were then washed three times in pre-chilled 10% glycerol and combined in 50 uL pre-chilled 10% glycerol. The electroporator was set to 1.8 kV. 2 uL of a the purified ΔleuE deletion PCR fragment are then added to the cells, mixed by pipetting, and pipetted into a sterile, chilled 1 mm cuvette. The cuvette was placed into the sample chamber, and the electric pulse was applied. 500 uL of room-temperature SOC media was immediately added, and the mixture was transferred to a culture tube and incubated at 37° C. for 1 hr. The cells were spread out on an LB plate containing 50 ug/mL kanamycin. Five kanamycin-resistant transformants were then checked by colony PCR for the deletion of the leuE locus. 
     The kanamycin cassette was then excised from the ΔleuE deletion strain as follows. ΔleuE was transformed with the pCP20 plasmid encoding the Flp recombinase gene. An overnight culture of ΔleuE grown at 37° C. in LB with 50 ug/mL kanamycin was diluted 1:100 in 4 mL of LB and grown at 37° C. until it reaches an OD 600  of 0.4-0.6. 1 mL of the culture was then centrifuged at 13,000 rpm for 1 min in a 1.5 mL microcentrifuge tube and the supernatant was removed. The cells were then washed three times in pre-chilled 10% glycerol and resuspended in 40 uL pre-chilled 10% glycerol. The electroporator was set to 1.8 kV. 1 uL of a pCP20 miniprep was added to the cells, mixed by pipetting, and pipetted into a sterile, chilled 1 mm cuvette. The dry cuvette was placed into the sample chamber, and the electric pulse was applied. 500 uL of room-temperature SOC media was immediately added, and the mixture was transferred to a culture tube and incubated at 30° C. for 1 hr. The cells were spread out on an LB plate containing 100 ug/mL carbenicillin and incubated at 30° C. Eight transformants were then streaked on an LB plate and were incubated overnight at 43° C. One colony per transformant was picked and resuspended in 10 uL LB and 3 uL of the suspension were pipetted on LB, LB with 50 ug/mL Kanamycin or LB with 100 ug/mL carbenicillin. The LB and LB Kanamycin plates were incubated at 37° C. and the LB Carbenicillin plate was incubated at 30° C. Colonies showing growth on LB alone were selected and checked by PCR for the excision of the Kanamycin cassette. 
     Example 6. Generation of Recombinant Bacteria Comprising an Importer of a Branched Chain Amino Acid and/or a Branched Chain Amino Acid Catabolism Enzyme and Lacking an Exporter of a Branched Chain Amino Acid 
     pTet-kivD, pTet-bkd, pTet-ldh-bkd and pTet-livKHFGF plasmids described above were transformed into  E. coli  Nissle (pTet-kivD), Nissle (pTet-kivD, pTet-bkd, pTet-ldh-bkd), DH5α (pTet-kivD, pTet-bkd, pTet-ldh-bkd) or PIRI (pTet-livKHMGF). All tubes, solutions, and cuvettes were pre-chilled to 4° C. An overnight culture of  E. coli  (Nissle, ΔleuE, DH5α or PIR1) was diluted 1:100 in 4 mL of LB and grown until it reached an OD 600  of 0.4-0.6. 1 mL of the culture was then centrifuged at 13,000 rpm for 1 min in a 1.5 mL microcentrifuge tube and the supernatant was removed. The cells were then washed three times in pre-chilled 10% glycerol and resuspended in 40 uL pre-chilled 10% glycerol. The electroporator was set to 1.8 kV. 1 uL of a pTet-kivD, pTet-bkd, pTet-ldh-bkd or pTet-livKHMGF miniprep was added to the cells, mixed by pipetting, and pipetted into a sterile, chilled 1 mm cuvette. The dry cuvette was placed into the sample chamber, and the electric pulse was applied. 500 uL of room-temperature SOC media was immediately added, and the mixture was transferred to a culture tube and incubated at 37° C. for 1 hr. The cells were spread out on an LB plate containing 50 ug/mL Kanamycin for pTet-kivD, pTet-bkd and pTet-ldh-bkd or 100 ug/mL carbenicillin for pTet-livKHMGF. 
     Example 7. Generation of Recombinant Bacteria Comprising an Importer of a Branched Chain Amino Acid and a Genetic Modification that Reduces Export of a Branched Chain Amino Acid 
       E. coli  Nissle ΔleuE was transformed with the pKD46 plasmid encoding the lambda red proteins under the control of an arabinose-inducible promoter as follows. An overnight culture of  E. coli  Nissle ΔleuE grown at 37° C. was diluted 1:100 in 4 mL of LB and grown at 37° C. until it reached an OD 600  of 0.4-0.6. 1 mL of the culture was then centrifuged at 13,000 rpm for 1 m in a 1.5 mL microcentrifuge tube and the supernatant was removed. The cells were then washed three times in pre-chilled 10% glycerol and resuspended in 40 uL pre-chilled 10% glycerol. The electroporator was set to 1.8 kV. 1 uL of a pKD46 miniprep was added to the cells, mixed by pipetting, and pipetted into a sterile, chilled 1 mm cuvette. The dry cuvette was placed into the sample chamber, and the electric pulse was applied. 500 uL of room-temperature SOC media was immediately added, and the mixture was transferred to a culture tube and incubated at 30° C. for 1 hr. The cells were spread out on an LB plate containing 100 ug/mL carbenicillin and incubated at 30° C. 
     The DNA fragment used to integrate Tet-livKHMGF into  E. coli  Nissle lacZ was amplified by PCR from the pTet-livKHMGF plasmid, column-purified and transformed into ΔleuE pKD46 as follows. An overnight culture of the  E. coli  Nissle ΔleuE pKD46 strain grown in LB at 30° C. with 100 ug/mL carbenicillin was diluted 1:100 in 5 mL of lysogeny broth (LB) supplemented with 100 ug/mL carbenicillin, 0.15% arabinose and grown at 30° C. until it reached an OD 600  of 0.4-0.6. The bacteria were aliquoted equally in five 1.5 mL microcentrifuge tubes, centrifuged at 13,000 rpm for 1 min and the supernatant was removed. The cells were then washed three times in pre-chilled 10% glycerol and combined in 50 uL pre-chilled 10% glycerol. The electroporator was set to 1.8 kV. 2 uL of a the purified Tet-livKHMGF PCR fragment were then added to the cells, mixed by pipetting, and pipetted into a sterile, chilled 1 mm cuvette. The dry cuvette was placed into the sample chamber, and the electric pulse was applied. 500 uL of room-temperature SOC media was immediately added, and the mixture was transferred to a culture tube and incubated at 37° C. for 1 hr. The cells were spread out on an LB plate containing 20 ug/mL chloramphenicol, 40 ug/mL X-Gal and incubated overnight at 37° C. White chloramphenicol resistant transformants were then checked by colony PCR for integration of Tet-livKHMGF into the lacZ locus. 
     Example 8. Functional Assay Demonstrating that the Recombinant Bacterial Cells Decrease Branched Chain Amino Acid Concentration 
     For in vitro studies, all incubations were performed at 37° C. Cultures of  E. coli  Nissle ΔleuE, ΔleuE+pTet-kivD, ΔleuE+pTet-bkd, ΔleuE+pTet-ldh-bkd, ΔleuE lacZ:Tet-livKHMGF, ΔleuE lacZ:Tet-livKHMGF+pTet-kivD, ΔleuE lacZ:Tet-livKHMGF+pTet-bkd, ΔleuE lacZ:Tet-livKHMGF+pTet-ldh-bkd were grown overnight in LB, LB 50 ug/mL Kanamycin or LB 50 ug/mL Kanamycin 20 ug/mL chloramphenicol and then diluted 1:100 in LB. The cells were grown with shaking (250 rpm) to early log phase with the appropriate antibiotics. Anhydrous tetracycline (ATC) was added to cultures at a concentration of 100 ng/mL to induce expression of KivD, Bkd, Ldh and LivKHFMG, and bacteria were grown for another 3 hours. Bacteria were then pelleted, washed, and resuspended in minimal media, and supplemented with 0.5% glucose and 2 mM leucine. Aliquots were removed at 0 h, 1.5 h, 6 h and 18 h for leucine quantification by liquid chromatography-mass spectrometry (LCMS) using a Thermo TSQ Quantum Max triple quadrupole instrument. Briefly, 100 uL aliquots were centrifuged at 4,500 rpm for 10 min. 10 uL of the supernatant was resuspended in 90 uL water with 1 ug/mL L-leucine-5,5,5-d 3  (isotope used as internal standard). 10 uL of the samples was then resuspended in 90 uL 10% acetonitrile, 0.1% formic acid and placed in the LCMS autosampler. A C18 column 100×2 mm, 3 um particles was used (Luna, Phenomenex). The mobile phases used were water 0.1% formic acid (solvent A) and acetonitrile 0.1% (solvent B). The gradient used was: 
     0 min: 95% A, 5% B 
     0.5 min: 95% A, 5% B 
     1 min: 10% A, 90% B 
     2.5 min: 10% A, 90% B 
     2.51 min: 95% A, 5% B 
     3.5 min: 95% A, 5% B 
     The Q1/Q3 transitions used for leucine and L-leucine-5,5,5-d 3  were 132.1/86.2 and 135.1/89.3 respectively. 
     Leucine was rapidly graded by the expression of kivD in the Nissle ΔleuE strain. After 6 h of incubation, leucine concentration dropped by over 99% in the presence of ATC. This effect was even more pronounced in the case of ΔleuE expressing both kivD and the leucine transporter livKHMGF where leucine is undetectable after 6 h of incubation. The expression of the bkd complex also leads rapidly to the degradation of leucine. After 6 h of incubation, 99% of leucine was degraded. The expression of the leucine transporter livKHMGF, in parallel with the expression of ldh and bkd leads to the complete degradation of leucine after 18 h. 
     Example 9. Simultaneous Degradation of Branched Chain Amino Acids by Recombinant Bacteria Expressing a Branched Chain Amino Acid Catabolism Enzyme and an Importer of a Branched Chain Amino Acid 
     In these studies, all incubations were performed at 37° C. Cultures of  E. coli  Nissle, Nissle+pTet-kivD, ΔleuE+pTet-kivD, ΔleuE lacZ:Tet-livKHMGF+pTet-kivD were grown overnight in LB, LB 50 ug/mL Kanamycin or LB 50 ug/mL Kanamycin 20 ug/mL chloramphenicol and then diluted 1:100 in LB. The cells were grown with shaking (250 rpm) to early log phase with the appropriate antibiotics. Anhydrous tetracycline (ATC) was added to cultures at a concentration of 100 ng/mL to induce expression of KivD and LivKHFMG, and bacteria were grown for another 3 hours. Bacteria were then pelleted, washed, and resuspended in minimal media, and supplemented with 0.5% glucose and the three branched chain amino acids (leucine, isoleucine and valine, 2 mM each). Aliquots were removed at 0 h, 1.5 h, 6 h and 18 h for leucine, isoleucine and valine quantification by liquid chromatography-mass spectrometry (LCMS) using a Thermo TSQ Quantum Max triple quadrupole instrument. Briefly, 100 uL aliquots were centrifuged at 4,500 rpm for 10 min. 10 uL of the supernatant was resuspended in 90 uL water with 1 ug/mL L-leucine-5,5,5-d 3  (isotope used as internal standard). 10 uL of the samples was then resuspended in water, 0.1% formic acid and placed in the LCMS autosampler. A C18 column 100×2 mm, 3 um particles was used (Luna, Phenomenex). The mobile phases used were water 0.1% formic acid (solvent A) and acetonitrile 0.1% (solvent B). The gradient used was: 
     0 min: 100% A, 0% B 
     0.5 min: 100% A, 0% B 
     1.5 min: 10% A, 90% B 
     3.5 min: 10% A, 90% B 
     3.51 min: 100% A, 0% B 
     4.5 min: 100% A, 0% B 
     The Q1/Q3 transitions used are: 
     Leucine:132.1/86.2 
     L-leucine-5,5,5-d 3 :135.1/89.3 
     Isoleucine:132.1/86.2 
     Valine:118.1/72 
     As shown in  FIGS. 32A-32C , leucine, isoleucine and valine were all degraded by the expression of kivD in  E. coli  Nissle. At 18 h, 96.8%, 67.2% and 52.1% of leucine, isoleucine and valine respectively were degraded in Nissle expressing kivD in the presence of ATC. The efficiency of leucine and isoleucine degradation was further improved by expressing kivD in the ΔleuE background strain with a 99.8% leucine and 80.6% isoleucine degradation at 18 h. Finally, an additional increase in leucine and isoleucine degradation was achieved by expressing the leucine transporter livKHMGF in the Nissle ΔleuE pTet-kivD strain with a 99.98% leucine and 95.5% isoleucine degradation at 18 h. No significant improvement in valine degradation was observed in the ΔleuE deletion strain expressing livKHMGF. 
     Example 10. Increase of BCAA Import by Overexpressing the High Affinity BCAA Transporters livKHMGF and livJHMGF In Vitro 
     Study Objective 
     
         
         
           
             BCAA accumulate to toxic levels in MSUD patients 
             Different synthetic probiotic  E. coli  Nissle strains were engineered to efficiently import BCAA into the bacterial cell to be degraded 
             The objective of this study was to determine if expressing the two BCAA transporters livKHMGF and livJHMGF increase the import of valine, a BCAA naturally secreted to high levels by  E. coli  Nissle. 
           
         
       
    
     Description of the Different Probiotic Strains 
     
         
         
           
             All strains are derived from the human probiotic strain  E. coli  Nissle 1917. A ΔleuE deletion strain (deleted for the leucine exporter leuE) was generated by lambda red-recombination 
             A copy of the high-affinity leucine ABC transporter livK-IMGiF under the control of a tetracycline-inducible promoter (Ptet) was inserted into the lacZ locus of the ΔleuE deletion strain by lambda-red recombination to generate the ΔleuE, lacZ:Ptet-livKHMGF strain. In this strain, the BCAA transporter livKHMGF can get induced in the presence of anhydrotetracycline (ATC) 
             Finally, the endogenous promoter of livJ was swapped with the constitutive promoter Ptac by lambda-red recombination to generate the ΔleuE, lacZ:Ptet-livKHMGF, Ptac-livJ strain. In this strain, livJ is constitutively induced. In the presence of ATC, both BCAA transporters livKHMGF and livJHMGF are expressed 
           
         
       
    
     Experimental Procedure 
     
         
         
           
             The three strains tested (ΔleuE; ΔleuE, lacZ:Ptet-livKHMGF; ΔleuE, lacZ:Ptet-livKHMGF, Ptac-livJ) were grown overnight at 37° C. and 250 rpm in 4 mL of LB 
             Cells were diluted 100 fold in 4 mL LB and grown for 2 h at 37° C. and 250 rpm 
             Cells were split in two 2 mL culture tubes 
             One 2 mL culture tube was induced with 100 ng/mL anhydrotetracycline (ATC) to activate the Ptet promoter 
             After 1 h induction, 1 mL of cells was spun down at maximum speed for 30 seconds in a microcentrifuge 
             The supernatant was removed and the pellet re-suspended in 1 mL M9 medium 0.5% glucose 
             The cells were spun down again at maximum speed for 30 seconds and resuspended in 1 mL M9 medium 0.5% glucose 
             The cells were transferred to a culture tube and incubated at at 37° C. and 250 rpm for 5.5 h 
             150 μL of cells were collected at 0 h, 2 h and 5.5 h 
             The concentration of valine in the cell supernatant at the different time points was determined by LC-MS/MS. 
           
         
       
    
     Results 
     The natural secretion of valine by  E. coli  Nissle is observed for the ΔleuE strain. The secretion of valine is strongly reduced for ΔleuE, lacZ:Ptet-livKHMGF in the presence of ATC. This strongly suggests that the secreted valine is efficiently imported back into the cell by livKHMGF. The secretion of valine is abolished in the ΔleuE, lacZ:Ptet-livKHMGF, Ptac-livJ strain, with or without ATC. This strongly suggests that the constitutive expression of livJ is sufficient to import back the entire amount of valine secreted by the cell via the livJHMGF transporter.  E. coli  Nissle was engineered to efficiently import BCAA, in this case valine, using both an inducible promoter (Ptet), and a constitutive promoter (Ptac), controlling the expression of livKHMGF and livJ respectively. 
     Example 11: Generation of Bacterial Strains with Enhance Ability to Transport Biomolecules 
     Due to their ease of culture, short generation times, very high population densities and small genomes, microbes can be evolved to unique phenotypes in abbreviated timescales. Adaptive laboratory evolution (ALE) is the process of passaging microbes under selective pressure to evolve a strain with a preferred phenotype. Most commonly, this is applied to increase utilization of carbon/energy sources or adapting a strain to environmental stresses (e.g., temperature, pH), whereby mutant strains more capable of growth on the carbon substrate or under stress will outcompete the less adapted strains in the population and will eventually come to dominate the population. 
     This same process can be extended to any essential metabolite by creating an auxotroph. An auxotroph is a strain incapable of synthesizing an essential metabolite and must therefore have the metabolite provided in the media to grow. In this scenario, by making an auxotroph and passaging it on decreasing amounts of the metabolite, the resulting dominant strains should be more capable of obtaining and incorporating this essential metabolite. 
     For example, if the biosynthetic pathway for producing an amino acid is disrupted a strain capable of high-affinity capture of said amino acid can be evolved via ALE. First, the strain is grown in varying concentrations of the auxotrophic amino acid, until a minimum concentration to support growth is established. The strain is then passaged at that concentration, and diluted into lowering concentrations of the amino acid at regular intervals. Over time, cells that are most competitive for the amino acid—at growth-limiting concentrations—will come to dominate the population. These strains will likely have mutations in their amino acid-transporters resulting in increased ability to import the essential and limiting amino acid. 
     Similarly, by using an auxotroph that cannot use an upstream metabolite to form an amino acid, a strain can be evolved that not only can more efficiently import the upstream metabolite, but also convert the metabolite into the essential downstream metabolite. These strains will also evolve mutations to increase import of the upstream metabolite, but may also contain mutations which increase expression or reaction kinetics of downstream enzymes, or that reduce competitive substrate utilization pathways. 
     In the previous examples, a metabolite innate to the microbe was made essential via mutational auxotrophy and selection was applied with growth-limiting supplementation of the endogenous metabolite. However, phenotypes capable of consuming non-native compounds can be evolved by tying their consumption to the production of an essential compound. For example, if a gene from a different organism is isolated which can produce an essential compound or a precursor to an essential compound this gene can be recombinantly introduced and expressed in the heterologous host. This new host strain will now have the ability to synthesize an essential nutrient from a previously non-metabolizable substrate. Hereby, a similar ALE process can be applied by creating an auxotroph incapable of converting an immediately downstream metabolite and selecting in growth-limiting amounts of the non-native compound with concurrent expression of the recombinant enzyme. This will result in mutations in the transport of the non-native substrate, expression and activity of the heterologous enzyme and expression and activity of downstream native enzymes. It should be emphasized that the key requirement in this process is the ability to tether the consumption of the non-native metabolite to the production of a metabolite essential to growth. 
     Once the basis of the selection mechanism is established and minimum levels of supplementation have been established, the actual ALE experimentation can proceed. Throughout this process several parameters must be vigilantly monitored. It is important that the cultures are maintained in an exponential growth phase and not allowed to reach saturation/stationary phase. This means that growth rates must be check during each passaging and subsequent dilutions adjusted accordingly. If growth rate improves to such a degree that dilutions become large, then the concentration of auxotrophic supplementation should be decreased such that growth rate is slowed, selection pressure is increased and dilutions are not so severe as to heavily bias subpopulations during passaging. In addition, at regular intervals cells should be diluted, grown on solid media and individual clones tested to confirm growth rate phenotypes observed in the ALE cultures. 
     Predicting when to halt the stop the ALE experiment also requires vigilance. As the success of directing evolution is tied directly to the number of mutations “screened” throughout the experiment and mutations are generally a function of errors during DNA replication, the cumulative cell divisions (CCD) acts as a proxy for total mutants which have been screened. Previous studies have shown that beneficial phenotypes for growth on different carbon sources can be isolated in about 10 11.2  CCD 1 . This rate can be accelerated by the addition of chemical mutagens to the cultures—such as N-methyl-N-nitro-N-nitrosoguanidine (NTG)—which causes increased DNA replication errors. However, when continued passaging leads to marginal or no improvement in growth rate the population has converged to some fitness maximum and the ALE experiment can be halted. 
     At the conclusion of the ALE experiment, the cells should be diluted, isolated on solid media and assayed for growth phenotypes matching that of the culture flask. Best performers from those selected are then prepped for genomic DNA and sent for whole genome sequencing. Sequencing with reveal mutations occurring around the genome capable of providing improved phenotypes, but will also contain silent mutations (those which provide no benefit but do not detract from desired phenotype). In cultures evolved in the presence of NTG or other chemical mutagen, there will be significantly more silent, background mutations. If satisfied with the best performing strain in its current state, the user can proceed to application with that strain. Otherwise the contributing mutations can be deconvoluted from the evolved strain by reintroducing the mutations to the parent strain by genome engineering techniques. See Lee, D.-H., Feist, A. M., Barrett, C. L. &amp; Palsson, B. O. Cumulative Number of Cell Divisions as a Meaningful Timescale for Adaptive Laboratory Evolution of  Escherichia coli. PLoS ONE  6, e26172 (2011). 
     These methods were used to generate  E. coli  Nissle mutants that consume kynurenine and over-produce tryptophan as described elsewhere herein. 
     Example 12: Engineered Bacteria Engineered to Efficiently Import KYN 
     In the tumor microenvironment the amino acid tryptophan (TRP) and its degradation product kynurenine (KYN) play pivotal roles as immunomodulatory signals. Tumors often degrade TRP (which has proinflammatory properties) into KYN, which possesses anti-inflammatory characteristics, thereby promoting evasion from immune surveillance. 
       E. coli  Nissle can be engineered to efficiently import KYN and convert it to TRP. While Nissle does not typically utilize KYN, by introducing the Kynureninase (KYNase) from  Pseudomonas fluorescens  (kynU) on a medium-copy plasmid under the control of the tetracycline promoter (Ptet) a new strain with this plasmid (Ptet-KYNase) is able to convert L-kynurenine into anthranilate. 
       E. coli  naturally utilizes anthranilate in its TRP biosynthetic pathway. Briefly, the TrpE (in complex with TrpD) enzyme converts chorismate into anthranilate. TrpD, TrpC, TrpA and TrpB then catalyze a five-step reaction ending with the condensation of an indole with serine to form tryptophan. By replacing the TrpE enzyme via lambda-RED recombineering, the subsequent strain of Nissle (ΔtrpE::Cm) is an auxotroph unable to grow in minimal media without supplementation of TRP or anthranilate. By expressing kynureninase in ΔtrpE::Cm (KYNase-trpE), this auxotrophy can be alternatively rescued by providing KYN. 
     Leveraging the growth-limiting nature of KYN in KYNase-trpE, adaptive laboratory evolution was employed to evolve a strain capable of increasingly efficient utilization of KYN. First a lower limit of KYN concentration was established and mutants were evolved by passaging in lowering concentrations of KYN. While this can select for mutants capable of increasing KYN import, the bacterial cells still prefer to utilize free, exogenous TRP. In the tumor environment, dual-therapeutic functions can be provided by depletion of KYN and increasing local concentrations of TRP. Therefore, to evolve a strain which prefers KYN over TRP, a toxic analogue of TRP—5-fluoro-L-tryptophan (ToxTRP)—can be incorporated into the ALE experiment. The resulting best performing strain is then whole genome sequenced in order to deconvolute the contributing mutations. Lambda-RED can be performed in order to reintroduce TrpE, to inactivate Trp regulation (trpR, tyrR, transcriptional attenuators) to up-regulate TrpABCDE expression and increase chorismate production. The resulting strain is now insensitive to external TRP, efficiently converts KYN into TRP, and also now overproduces TRP. 
     
       
         
           
               
            
               
                   
               
               
                 [194] Kynureninase protein sequences 
               
            
           
           
               
               
               
            
               
                 Description 
                 ID 
                 Sequence 
               
               
                   
               
               
                 Pseudomonas 
                 P83788 
                 MTTRNDCLALDAQDSLAPLRQQFALPEG 
               
               
                 kynureninase 
                   
                 VIYLDGNSLGARPVAALARAQAVIAEEW 
               
               
                   
                   
                 GNGLIRSWNSAGWRDLSERLGNRLATLI 
               
               
                   
                   
                 GARDGEVVVTDTTSINLFKVLSAALRVQ 
               
               
                   
                   
                 ATRSPERRVIVTETSNFPTDLYIAEGLA 
               
               
                   
                   
                 DMLQQGYTLRLVDSPEELPQAIDQDTAV 
               
               
                   
                   
                 VMLTHVNYKTGYMHDMQALTALSHECGA 
               
               
                   
                   
                 LAIWDLAHSAGAVPVDLHQAGADYAIGC 
               
               
                   
                   
                 TYKYLNGGPGSQAFVWVSPQLCDLVPQP 
               
               
                   
                   
                 LSGWFGHSRQFAMEPRYEPSNGIARYLC 
               
               
                   
                   
                 GTQPITSLAMVECGLDVFAQTDMASLRR 
               
               
                   
                   
                 KSLALTDLFIELVEQRCAAHELTLVTPR 
               
               
                   
                   
                 EHAKRGSHVSFEHPEGYAVIQALIDRGV 
               
               
                   
                   
                 IGDYREPRIMRFGFTPLYTTFTEVWDAV 
               
               
                   
                   
                 QILGEILDRKTWAQAQFQVRHSVT* 
               
               
                   
               
               
                 Human 
                 Q16719 
                 MEPSSLELPADTVQRIAAELKCHPTDER 
               
               
                   
                   
                 VALHLDEEDKLRHFRECFYIPKIQDLPP 
               
               
                   
                   
                 VDLSLVNKDENAIYFLGNSLGLQPKMVK 
               
               
                   
                   
                 TYLEEELDKWAKIAAYGHEVGKRPWITG 
               
               
                   
                   
                 DESIVGLMKDIVGANEKEIALMNALTVN 
               
               
                   
                   
                 LHLLMLSFFKPTPKRYKILLEAKAFPSD 
               
               
                   
                   
                 HYAIESQLQLHGLNIEESMRMIKPREGE 
               
               
                   
                   
                 ETLRIEDILEVIEKEGDSIAVILFSGVH 
               
               
                   
                   
                 FYTGQHFNIPAITKAGQAKGCYVGFDLA 
               
               
                   
                   
                 HAVGNVELYLHDWGVDFACWCSYKYLNA 
               
               
                   
                   
                 GAGGIAGAFIHEKHAHTIKPALVGWFGH 
               
               
                   
                   
                 ELSTRFKMDNKLQLIPGVCGFRISNPPI 
               
               
                   
                   
                 LLVCSLHASLEIFKQATMKALRKKSVLL 
               
               
                   
                   
                 TGYLEYLIKHNYGKDKAATKKPVVNIIT 
               
               
                   
                   
                 PSHVEERGCQLTITFSVPNKDVFQELEK 
               
               
                   
                   
                 RGVVCDKRNPNGIRVAPVPLYNSFHDVY 
               
               
                   
                   
                 KFTNLLTSILDSAETKN* 
               
               
                   
               
               
                 Shewanella 
                 Q8E973 
                 MLLNVKQDFCLAGPGYLLNHSVGRPLKS 
               
               
                   
                   
                 TEQALKQAFFAPWQESGREPWGQWLGVI 
               
               
                   
                   
                 DNFTAALASLFNGQPQDFCPQVNLSSAL 
               
               
                   
                   
                 TKIVMSLDRLTRDLTRNGGAVVLMSEID 
               
               
                   
                   
                 FPSMGFALKKALPASCELRFIPKSLDVT 
               
               
                   
                   
                 DPNVWDAHICDDVDLVFVSHAYSNTGQQ 
               
               
                   
                   
                 APLAQIISLARERGCLSLVDVAQSAGIL 
               
               
                   
                   
                 PLDLAKLQPDFMIGSSVKWLCSGPGAAY 
               
               
                   
                   
                 LWVNPAILPECQPQDVGWFSHENPFEFD 
               
               
                   
                   
                 IHDFRYHPTALRFWGGTPSIAPYAIAAH 
               
               
                   
                   
                 SIEYFANIGSQVMREHNLQLMEPVVQAL 
               
               
                   
                   
                 DNELVSPQEVDKRSGTIILQFGERQPQI 
               
               
                   
                   
                 LAALAAANISVDTRSLGIRVSPHIYNDE 
               
               
                   
                   
                 ADIARLLGVIKANR* 
               
               
                   
               
               
                 *designates the position of the stop codon 
               
            
           
         
       
     
                            Selected codon-optimized sequences for        Kynureninase [480]                             Kynureninase               protein               sequences   Kynureninase protein sequences                       Ptet-     atctaatctagacatcattaattcctaattt             kynU     ttgttgacactctatcattgatagagttatt             (Pseudomonas)     ttaccactccctatcagtgatagagaaaagt                   gaa   ttatataaaagtgggaggtgcccga atg               acgacccgaaatgattgcctagcgttggatg               cacaggacagtctggctccgctgcgccaaca               atttgcgctgccggagggtgtgatatacctg               gatggcaattcgctgggcgcacgtccggtag               ctgcgctggctcgcgcgcaggctgtgatcgc               agaagaatggggcaacgggttgatccgttca               tggaactctgcgggctggcgtgatctgtctg               aacgcctgggtaatcgcctggctaccctgat               tggtgcgcgcgatggggaagtagttgttact               gataccacctcgattaatctgtttaaagtgc               tgtcagcggcgctgcgcgtgcaagctacccg               tagcccggagcgccgtgttatcgtgactgag               acctcgaatttcccgaccgacctgtatattg               cggaagggttggcggatatgctgcaacaagg               ttacactctgcgtttggtggattcaccggaa               gagctgccacaggctatagatcaggacaccg               cggtggtgatgctgacgcacgtaaattataa               aaccggttatatgcacgacatgcaggctctg               accgcgttgagccacgagtgtggggctctgg               cgatttgggatctggcgcactctgctggcgc               tgtgccggtggacctgcaccaagcgggcgcg               gactatgcgattggctgcacgtacaaatacc               tgaatggcggcccgggttcgcaagcgtttgt               ttgggtttcgccgcaactgtgcgacctggta               ccgcagccgctgtctggttggttcggccata               gtcgccaattcgcgatggagccgcgctacga               accttctaacggcattgctcgctatctgtgc               ggcactcagcctattactagcttggctatgg               tggagtgcggcctggatgtgtttgcgcagac               ggatatggcttcgctgcgccgtaaaagtctg               gcgctgactgatctgttcatcgagctggttg               aacaacgctgcgctgcacacgaactgaccct               ggttactccacgtgaacacgcgaaacgcggc               tctcacgtgtcttttgaacaccccgagggtt               acgctgttattcaagctctgattgatcgtgg               cgtgatcggcgattaccgtgagccacgtatt               atgcgtttcggtttcactcctctgtatacta               cttttacggaagtttgggatgcagtacaaat               cctgggcgaaatcctggatcgtaagacttgg               gcgcaggctcagtttcaggtgcgccactctg               ttacttaa aaataaaacgaaaggctcagtcg                   aaagactgggcctttcgttttatctgttg                         Ptet-kynU     atctaatctagacatcattaattcctaattt             (Human)     ttgttgacactctatcattgatagagttatt                   ttaccactccctatcagtgatagagaaaagt                   gaa   tatcaagacacgaggaggtaagatt atg               gagccttcatctttagaactgccagcggaca               cggtgcagcgcatcgcggcggaactgaagtg               ccatccgactgatgagcgtgtggcgctgcat               ctggacgaagaagataaactgcgccactttc               gtgaatgtttttatattcctaaaattcaaga               cttgccgccggtagatttgagtctcgttaac               aaagatgaaaacgcgatctactttctgggca               actctctgggtctgcaaccaaaaatggttaa               aacgtacctggaggaagaactggataaatgg               gcaaaaatcgcggcttatggtcacgaagtgg               gcaagcgtccttggattactggcgacgagtc               tattgtgggtttgatgaaagatattgtgggc               gcgaatgaaaaggaaattgcactgatgaatg               ctctgaccgttaatctgcacctgctgatgct               gtctttttttaaaccgaccccgaaacgctac               aaaatactgctggaagcgaaagcgtttccgt               cggatcactatgctatagaaagtcaactgca               gttgcatggtctgaatatcgaggaatctatg               cgcatgattaaaccgcgtgagggtgaagaaa               cgctgcgtattgaagacattctggaagttat               tgaaaaagaaggtgattctatcgcagttata               ctgttttctggcgtgcacttttatacaggtc               agcacttcaatatcccggcaatcactaaagc               ggggcaggcaaaaggctgctatgttggtttt               gacctggcgcatgcagtggggaatgttgaac               tgtatctgcacgattggggcgttgatttcgc               gtgttggtgtagctacaaatatctgaacgct               ggcgcgggtggcattgctggcgcttttattc               acgaaaaacacgcgcacaccattaaaccggc               tctggttggctggttcggtcatgagctgagt               actcgctttaaaatggataacaaactgcaat               tgattccgggtgtttgcggcttccgtatcag               caatccgccgattctgctggtttgcagcctg               cacgctagtctggaaatctttaagcaggcga               ctatgaaagcgctgcgcaaaaaatctgtgct               gctgaccggctatctggagtatctgatcaaa               cacaattatggcaaagataaagctgcaacta               aaaaaccggtagtgaacattatcaccccctc               acacgtggaggagcgcggttgtcagctgact               attactttcagtgtacctaataaagatgtgt               tccaggaactggaaaaacgcggcgttgtttg               tgataaacgtaacccgaatggtattcgcgtg               gctcctgtgccgctgtacaattcattccacg               atgtttataaattcaccaacctgctgacttc               tattctcgacagtgctgagactaaaaattaa                 aaataaaacgaaaggctcagtcgaaagactg                   ggcctttcgttttatctgttg                         ptet-     atctaatctagacatcattaattcctaattt             kynU     ttgttgacactctatcattgatagagttatt             (Shewanella)     ttaccactccctatcagtgatagagaaaagt                   gaa   tggttcaccaccacaaggagggatt atg               ctgctgaatgtaaaacaggacttttgcctgg               caggcccgggctacctgctgaatcactcggt               tggccgtccgctgaaatcaactgagcaagcg               ctgaaacaagcattttttgctccgtggcaag               agagcggtcgtgaaccgtggggccagtggct               gggtgttattgataatttcactgctgcgctg               gcatctctgtttaatggtcaaccgcaggatt               tttgtccgcaggttaacctgagcagcgcgct               gactaaaattgtgatgtcactggatcgtctg               actcgcgatctgacccgcaatggcggtgctg               ttgtgctgatgtctgaaatcgatttcccatc               tatgggcttcgcgttgaaaaaagcgctgcca               gcgagctgcgaactgcgttttatcccgaaaa               gtctggacgtgactgatccgaacgtatggga               tgcacacatctgtgatgatgtagacctggtt               tttgtgtctcacgcctatagtaatacgggcc               aacaggctccgctggcgcaaatcatctctct               ggcgcgtgaacgtggctgcctgtcactggtg               gatgtagcgcaatcagcggggattttgccgc               tggatctggcgaaactgcaaccggacttcat               gatcggcagttcggttaaatggctgtgctcg               ggccctggtgcggcatatctgtgggttaatc               cggcgattctgccggaatgtcagccgcagga               tgtgggctggttttcacatgagaatcccttt               gaattcgacatccacgatttccgctaccacc               cgactgcactgcgcttttggggtggtacgcc               gtcgatcgcgccttatgcgatcgcggcgcac               tcgatcgaatattttgccaatatcggctcgc               aagtgatgcgtgaacacaacctgcaactgat               ggaaccggtggttcaggcgctggacaatgaa               ctggtgagcccgcaggaagtggataaacgct               caggcactattattctgcaattcggtgaacg               tcaaccgcaaattctggcggctctggctgcg               gcgaacatttcggtggacactcgttctttgg               ggattcgtgttagtccgcacatttataatga               tgaggcggacattgcgcgcctgctgggtgtg               atcaaagcaaatcgctaaaaataaaacgaaa               ggctcagtcgaaagactgggcctttcgtttt               atctgttg                        
The ptet-promoter is in bold, designed Ribosome binding site is underlined, codon-optimized protein coding sequence is in plain text, and the terminator is in italics. Generation of  E. coli  Mutants with increased ability to consume L-Kynurenine
 
     Example 13. Results 
     Adaptive Laboratory Evolution was used to produce mutant bacterial strains that consume Kynurenine and produce tryptophan. First, a ΔtrpE strain was constructed that expresses kynureninase and is capable of converting L-kynurenine to anthranilate to rescue the auxotrophic tryptophan background (KYNase).  E. coli  Nissle can be engineered to efficiently import KYN and convert it to TRP. While Nissle does not typically utilize KYN, by introducing the Kynureninase (KYNase) from  Pseudomonas fluorescens  (kyn U) on a medium-copy plasmid under the control of the tetracycline promoter (Ptet) a new strain with this plasmid (Ptet-KYNase) is able to convert L-kynurenine into anthranilate. 
       E. coli  naturally utilizes anthranilate in its TRP biosynthetic pathway. Briefly, the TrpE (in complex with TrpD) enzyme converts chorismate into anthranilate. TrpD, TrpC, TrpA and TrpB then catalyze a five-step reaction ending with the condensation of an indole with serine to form tryptophan. By replacing the TrpE enzyme via lambda-RED recombineering, the subsequent strain of Nissle (ΔtrpE::Cm) is an auxotroph unable to grow in minimal media without supplementation of TRP or anthranilate. By expressing kynureninase in ΔtrpE::Cm (KYNase-trpE), this auxotrophy can be alternatively rescued by providing KYN. 
     First a lower limit of KYN concentration was established and mutants were evolved by passaging in lowering concentrations of KYN. While this can select for mutants capable of increasing KYN import, the bacterial cells still prefer to utilize free, exogenous TRP. In the tumor environment, dual-therapeutic functions can be provided by depletion of KYN and increasing local concentrations of TRP. Therefore, to evolve a strain which prefers KYN over TRP, a toxic analogue of TRP—5-fluoro-L-tryptophan (ToxTRP)—can be incorporated into the ALE experiment. The resulting best performing strain is then whole genome sequenced in order to deconvolute the contributing mutations. Lambda-RED can be performed in order to reintroduce TrpE, to inactivate Trp regulation (trpR, tyrR, transcriptional attenuators) to up-regulate TrpABCDE expression and increase chorismate production. The resulting strain is now insensitive to external TRP, efficiently converts KYN into TRP, and also now overproduces TRP. 
     To establish the minimum concentration of L-kynurenine and maximum concentration of 5-fluoro-L-tryptophan (ToxTrp) capable of sustaining growth of the KYNase strain, using a checkerboard assay, the following protocol was used. Using a 96-well plate with M9 minimal media with glucose, KYNU is supplemented decreasing across columns in 2-fold dilutions from 2000 ug/mL down to ˜1 ug/mL. In the rows, ToxTrp concentration decreases by 2-fold from 200 ug/mL down to ˜1.5 ug/mL. In one plate, Anhydrous Tetracycline (aTc) was added to a final concentration of 100 ng/uL to induce production of the KYNase. From an overnight culture cells were diluted to an OD600=0.5 in 12 mL of TB (plus appropriate antibiotics and inducers, where applicable) and grown for 4 hours. 100 uL of cells were spun down and resuspended to an OD600=1.0. These were diluted 2000-fold and 25 uL was added to each well to bring the final volumes in each well to 100 uL. Cells were grown for roughly 20 hours with static incubation at 37 C then growth was assessed by OD600, making sure readings fell within linear range (0.05-1.0). 
     Once identified, the highest concentrations of ToxTrp and lowest concentration of kynurenine capable of supporting growth becomes the starting point for ALE. The ALE parental strain was chosen by culturing the KYNase strain on M9 minimal media supplemented with glucose and L-kynurenine (referred to as M9+KYNU from here on). A single colony was selected, resuspended in 20 uL of sterile phosphate-buffered saline solution. This colony was then used to inoculate three cultures of M9+KYNU, grown into late-logarithmic phase and optical density determined at 600 nm. These cultures were then diluted to 103 in 4 rows of a 96-well deep-well plate with 1 mL of M9+KYNU. Each one of the four rows has a different ToxTrp (increasing 2-fold), while each column has decreasing concentrations of KYNU (by 2-fold). Each morning and evening this plate is diluted back to 103 using the well in which the culture has grown to just below saturation so that the culture is always in logarithmic growth. This process is repeated until a change in growth rate is no longer detected. Once no growth rate increases are detected (usually around 10 11  Cumulative Cell Divisions) the culture is plated onto M9+KYNU. Phillips, R. S. Structure and mechanism of kynureninase.  Archives of Biochemistry and Biophysics  544, 69-74 (2014). Individual colonies are selected and screened in M9+KYNU+ToxTrp media to confirm increased growth rate phenotype. Once mutants with significantly increased growth rate on M9+KYNU are isolated, genomic DNA can be isolated and sent for whole genome sequencing to reveal the mutations responsible for phenotype. 
     All culturing is done shaking at 350 RPM at 37° C. 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                   
                 Rich 
                 Min 
                 Min + 
                 Min + 
               
               
                 STRAIN 
                 Media 
                 Media 
                 Anthranilate 
                 KYNU + aTc 
               
               
                   
               
             
            
               
                 SYN094 
                 + 
                 + 
                 + 
                 + 
               
               
                 trpE 
                 + 
                 − 
                 + 
                 − 
               
               
                 trpE 
                 + 
                 − 
                 + 
                 + 
               
               
                 pseudoKYNase 
               
               
                 trpE hKYNase 
                 + 
                 − 
                 + 
                 − 
               
               
                   
               
            
           
         
       
     
     In a preliminary assay, wildtype Nissle (SYNU94), Nissle with a deletion of trpE, and trpE mutants expressing either the human kynureninase (hKYNase) or the  Pseudomonas fluorescens  kynureninase (pseudoKYNase) from a Ptet promoter on a medium-copy plasmid were grown in either rich media, minimal media (min media), minimal media with 5 mM anthranilate (Min+ anthranilate) or minimal media with 10 mM kynurenine and 100 ng/uL aTc (Min+KYNU+aTc). These were grown in 1 mL of media in a deep well plate with shaking at 37° C. A positive for growth (+) in the above table indicates a change in optical density of &gt;5-fold from inoculation. 
     The results show that in a mutant trpE (which is typically used in the tryptophan biosynthetic pathway to convert chorismate into anthranilate) background, Nissle is unable to grow in minimal media without supplementation with anthranilate (or tryptophan). When minimal media was supplemented with KYNU, the trpE mutant was also unable to grow. However, when the pseudoKYNase was expressed in the trpE tryptophan-auxotroph the cells were able to grow in Min+KYNU. This indicates that Nissle is able to import L-kynurenine from the media and convert it into anthranilate using the pseudoKYNase. The hKYNase homolog was unable to support growth on M9+KYNU, most likely due to differences in substrate specificity as it has been documented that the human kynureninase prefers 3-hydroxykynurenine as a substrate. Lee, D.-H., Feist, A. M., Barrett, C. L. &amp; Palsson, B. O. Cumulative Number of Cell Divisions as a Meaningful Timescale for Adaptive Laboratory Evolution of  Escherichia coli . PLoS ONE 6, e26172 (2011). 
     Moving forward with the knowledge that Nissle is able to grow on KYNU supplemented minimal media in a trpE auxotroph by importing and converting kynurenine, the next step was to establish the minimal concentrations of kynurenine capable of supporting growth. Additionally, in our selection experiment if 5-fluoro-L-tryptophan (ToxTrp) was employed the concentrations of both KYNU and ToxTrp capable of still sustaining growth. A growth assay was performed in 96-well plates using SYN094, trpE and trpE pseudoKYNase with and without induction of pseudoKYNase expression using 100 ng/uL aTc. These strains were inoculated at very dilute concentrations into M9 minimal media with varying concentrations of KYNU across columns (2-fold dilutions starting at 2000 ug/mL) and varying concentrations of ToxTrp across rows (2-fold dilutions starting at 200 ug/mL). On a separate plate, the strains were grown in M9+KYNU (at the same concentrations) in the absence of ToxTrp. 
     The results of the initial checkerboard assay are displayed in  FIGS. 36-38  as a function of optical density at 600 nm (normalized to a media blank). In  FIGS. 36 and 37 , the X-axis shows decreasing KYNU concentration from left-to-right, while the Z-axis shows decreasing ToxTrp concentration from front-to-back with the very back row representing media with no ToxTrp. In  FIG. 38 . the control strains SYN094 and trpE are shown in M9+KYNU without any ToxTrp, as there was no growth detected from either strain at any concentration of ToxTrp. The results of the assay show that expression of the pseudoKYNase provides protection against toxicity of ToxTrp. More importantly, growth is permitted between 250-62.5 ug/mL of KYNU and 6.3-1.55 ug/mL of ToxTrp. 
     Together these experiments establish that expression of the  Pseudomonas fluorescens  kynureninase is sufficient to rescue a trpE auxotrophy in the presence of kynurenine. In addition, the pseudoKYNase is also capable of providing increased resistance to the toxic tryptophan, 5-fluoro-L-tryptophan. Using the information attained here it is possible to proceed to an adapative laboratory evolution experiment to select for mutants with highly efficient and selective conversion of kynurenine to tryptophan. 
     
       
         
           
               
            
               
                   
               
               
                 Sequence Listing 
               
            
           
           
               
               
               
            
               
                 SEQ 
                   
                   
               
               
                 ID 
                 Gene or 
                   
               
               
                 NO: 
                 Operon 
                 Sequence 
               
               
                   
               
               
                   6 
                 kivD 
                 ATGTATACAGTAGGAGATTACCTATTAGACCGATTACACGAGTTAGGAATTGAAGAAATTTTT 
               
               
                   
                 ( Lactococcus   
                 GGAGTCCCTGGAGACTATAACTTACAATTTTTAGATCAAATTATTTCCCACAAGGATATGAAA 
               
               
                   
                 
                   lactis 
                 
                 TGGGTCGGAAATGCTAATGAATTAAATGCTTCATATATGGCTGATGGCTATGCTCGTACTAAA 
               
               
                   
                 IFPL730) 
                 AAAGCTGCCGCATTTCTTACAACCTTTGGAGTAGGTGAATTGAGTGCAGTTAATGGATTAGCA 
               
               
                   
                   
                 GGAAGTTACGCCGAAAATTTACCAGTAGTAGAAATAGTGGGATCACCTACATCAAAAGTTCAA 
               
               
                   
                   
                 AATGAAGGAAAATTTGTTCATCATACGCTGGCTGACGGTGATTTTAAACACTTTATGAAAATG 
               
               
                   
                   
                 CACGAACCTGTTACAGCAGCTCGAACTTTACTGACAGCAGAAAATGCAACCGTTGAAATTGAC 
               
               
                   
                   
                 CGAGTACTTTCTGCACTATTAAAAGAAAGAAAACCTGTCTATATCAACTTACCAGTTGATGTT 
               
               
                   
                   
                 GCTGCTGCAAAAGCAGAGAAACCCTCACTCCCTTTGAAAAAGGAAAACTCAACTTCAAATACA 
               
               
                   
                   
                 AGTGACCAAGAAATTTTGAACAAAATTCAAGAAAGCTTGAAAAATGCCAAAAAACCAATCGTG 
               
               
                   
                   
                 ATTACAGGACATGAAATAATTAGTTTTGGCTTAGAAAAAACAGTCACTCAATTTATTTCAAAG 
               
               
                   
                   
                 ACAAAACTACCTATTACGACATTAAACTTTGGTAAAAGTTCAGTTGATGAAGCCCTCCCTTCA 
               
               
                   
                   
                 TTTTTAGGAATCTATAATGGTACACTCTCAGAGCCTAATCTTAAAGAATTCGTGGAATCAGCC 
               
               
                   
                   
                 GACTTCATCTTGATGCTTGGAGTTAAACTCACAGACTCTTCAACAGGAGCCTTCACTCATCAT 
               
               
                   
                   
                 TTAAATGAAAATAAAATGATTTCACTGAATATAGATGAAGGAAAAATATTTAACGAAAGAATC 
               
               
                   
                   
                 CAAAATTTTGATTTTGAATCCCTCATCTCCTCTCTCTTAGACCTAAGCGAAATAGAATACAAA 
               
               
                   
                   
                 GGAAAATATATCGATAAAAAGCAAGAAGACTTTGTTCCATCAAATGCGCTTTTATCACAAGAC 
               
               
                   
                   
                 CGCCTATGGCAAGCAGTTGAAAACCTAACTCAAAGCAATGAAACAATCGTTGCTGAACAAGGG 
               
               
                   
                   
                 ACATCATTCTTTGGCGCTTCATCAATTTTCTTAAAATCAAAGAGTCATTTTATTGGTCAACCC 
               
               
                   
                   
                 TTATGGGGATCAATTGGATATACATTCCCAGCAGCATTAGGAAGCCAAATTGCAGATAAAGAA 
               
               
                   
                   
                 AGCAGACACCTTTTATTTATTGGTGATGGTTCACTTCAACTTACAGTGCAAGAATTAGGATTA 
               
               
                   
                   
                 GCAATCAGAGAAAAAATTAATCCAATTTGCTTTATTATCAATAATGATGGTTATACAGTCGAA 
               
               
                   
                   
                 AGAGAAATTCATGGACCAAATCAAAGCTACAATGATATTCCAATGTGGAATTACTCAAAATTA 
               
               
                   
                   
                 CCAGAATCGTTTGGAGCAACAGAAGATCGAGTAGTCTCAAAAATCGTTAGAACTGAAAATGAA 
               
               
                   
                   
                 TTTGTGTCTGTCATGAAAGAAGCTCAAGCAGATCCAAATAGAATGTACTGGATTGAGTTAATT 
               
               
                   
                   
                 TTGGCAAAAGAAGGTGCACCAAAAGTACTGAAAAAAATGGGCAAACTATTTGCTGAACAAAAT 
               
               
                   
                   
                 AAATCATAA 
               
               
                   
               
               
                   7 
                 Tet-bkd 
                 gtaaaacgacggccagtgaattcgTTAAGACCCACTTTCACATTTAAGTTGTTTTTCTAATCC 
               
               
                   
                 construct 
                 GCATATGATCAATTCAAGGCCGAATAAGAAGGCTGGCTCTGCACCTTGGTGATCAAATAATTC 
               
               
                   
                 sequence 
                 GATAGCTTGTCGTAATAATGGCGGCATACTATCAGTAGTAGGTGTTTCCCTTTCTTCTTTAGC 
               
               
                   
                 (Gene coding 
                 GACTTGATGCTCTTGATCTTCCAATACGCAACCTAAAGTAAAATGCCCCACAGCGCTGAGTGC 
               
               
                   
                 regions are 
                 ATATAATGCATTCTCTAGTGAAAAACCTTGTTGGCATAAAAAGGCTAATTGATTTTCGAGAGT 
               
               
                   
                 shown in 
                 TTCATACTGTTTTTCTGTAGGCCGTGTACCTAAATGTACTTTTGCTCCATCGCGATGACTTAG 
               
               
                   
                 uppercase) 
                 TAAAGCACATCTAAAACTTTTAGCGTTATTACGTAAAAAATCTTGCCAGCTTTCCCCTTCTAA 
               
               
                   
                   
                 AGGGCAAAAGTGAGTATGGTGCCTATCTAACATCTCAATGGCTAAGGCGTCGAGCAAAGCCCG 
               
               
                   
                   
                 CTTATTTTTTACATGCCAATACAATGTAGGCTGCTCTACACCTAGCTTCTGGGCGAGTTTACG 
               
               
                   
                   
                 GGTTGTTAAACCTTCGATTCCGACCTCATTAAGCAGCTCTAATGCGCTGTTAATCACTTTACT 
               
               
                   
                   
                 TTTATCTAATCTAGACATcattaattcctaatttttgttgacactctatcattgatagagtta 
               
               
                   
                   
                 ttttaccactccctatcagtgatagagaaaagtgaactctagaaataattttgtttaacttta 
               
               
                   
                   
                 agaaggagatatacatATGAGTGATTACGAGCCGTTGCGTCTGCATGTCCCGGAGCCCACCGG 
               
               
                   
                   
                 GCGTCCTGGCTGCAAGACCGACTTTTCCTATCTGCACCTGTCCCCCGCCGGCGAGGTACGCAA 
               
               
                   
                   
                 GCCGCCGGTGGATGTCGAGCCCGCCGAAACCAGCGACCTGGCCTACAGCCTGGTACGTGTGCT 
               
               
                   
                   
                 CGACGACGACGGCCACGCCGTCGGTCCCTGGAATCCGCAGCTCAGCAACGAACAACTGCTGCG 
               
               
                   
                   
                 CGGCATGCGGGCGATGCTCAAGACCCGCCTGTTCGACGCGCGCATGCTCACCGCGCAACGGCA 
               
               
                   
                   
                 GAAAAAGCTTTCCTTCTATATGCAATGCCTCGGCGAGGAAGCCATCGCCACCGCCCACACCCT 
               
               
                   
                   
                 GGCCCTGCGCGACGGCGACATGTGCTTTCCGACCTATCGCCAGCAAGGCATCCTGATCACCCG 
               
               
                   
                   
                 CGAATACCCGCTGGTGGACATGATCTGCCAGCTTCTCTCCAACGAGGCCGACCCGCTCAAGGG 
               
               
                   
                   
                 CCGCCAGCTGCCGATCATGTACTCGAGCAAGGAGGCAGGTTTCTTCTCCATCTCCGGCAACCT 
               
               
                   
                   
                 CGCCACCCAGTTCATCCAGGCGGTCGGCTGGGGCATGGCCTCGGCGATCAAGGGCGACACGCG 
               
               
                   
                   
                 CATCGCCTCGGCCTGGATCGGCGACGGCGCCACCGCCGAGTCGGACTTCCACACCGCCCTCAC 
               
               
                   
                   
                 CTTCGCCCATGTCTACCGCGCGCCGGTAATCCTCAACGTGGTCAACAACCAGTGGGCGATCTC 
               
               
                   
                   
                 CACCTTCCAGGCCATCGCCGGCGGCGAAGGCACCACCTTCGCCAACCGTGGCGTGGGCTGCGG 
               
               
                   
                   
                 GATCGCCTCGCTGCGGGTCGACGGCAATGACTTCCTGGCGGTCTACGCCGCCTCCGAGTGGGC 
               
               
                   
                   
                 CGCCGAGCGCGCCCGGCGCAACCTCGGGCCGAGCCTGATCGAATGGGTCACCTACCGCGCCGG 
               
               
                   
                   
                 CCCGCACTCGACTTCGGACGACCCGTCCAAGTACCGCCCCGCCGACGACTGGACCAACTTCCC 
               
               
                   
                   
                 GCTGGGCGACCCGATCGCCCGCCTGAAGCGGCACATGATCGGCCTCGGCATCTGGTCGGAGGA 
               
               
                   
                   
                 ACAGCACGAAGCCACCCACAAGGCCCTCGAAGCCGAAGTACTGGCCGCGCAGAAACAGGCGGA 
               
               
                   
                   
                 GAGCCATGGCACCCTGATCGACGGCCGGGTGCCGAGCGCCGCCAGCATGTTCGAGGACGTCTA 
               
               
                   
                   
                 TGCAGAACTGCCGGAGCATCTGCGCCGGCAACGCCAGGAGCTCGGGGTATGAATGCCATGAAC 
               
               
                   
                   
                 CCGCAACACGAGAACGCCCAGACGGTCACCAGCATGACCATGATCCAGGCGCTGCGCTCGGCG 
               
               
                   
                   
                 ATGGACATCATGCTCGAGCGCGACGACGACGTGGTGGTATTCGGCCAGGACGTCGGCTACTTC 
               
               
                   
                   
                 GGCGGCGTGTTCCGCTGCACCGAAGGCCTGCAGAAGAAATACGGCACCTCGCGGGTGTTCGAT 
               
               
                   
                   
                 GCGCCGATCTCCGAGAGCGGCATCATCGGCGCCGCGGTCGGCATGGGTGCCTACGGCCTGCGC 
               
               
                   
                   
                 CCGGTGGTGGAGATCCAGTTCGCCGACTACGTCTACCCGGCCTCCGACCAGTTGATCTCCGAG 
               
               
                   
                   
                 GCGGCGCGCCTGCGCTATCGCTCGGCCGGCGACTTCATCGTGCCGATGACCGTACGCATGCCC 
               
               
                   
                   
                 TGTGGCGGCGGCATCTACGGCGGGCAAACGCACAGCCAGAGCCCGGAGGCGATGTTCACCCAG 
               
               
                   
                   
                 GTCTGCGGCCTGCGCACGGTGATGCCGTCCAACCCCTACGACGCCAAGGGCCTGCTGATCGCC 
               
               
                   
                   
                 TGCATCGAGAACGACGACCCGGTGATCTTCCTCGAGCCCAAGCGCCTCTACAACGGCCCGTTC 
               
               
                   
                   
                 GATGGCCACCACGACCGCCCGGTGACGCCCTGGTCCAAGCATCCGGCCAGCCAGGTGCCGGAC 
               
               
                   
                   
                 GGCTACTACAAGGTGCCGCTGGACAAGGCGGCGATCGTCCGCCCCGGCGCGGCGCTGACCGTG 
               
               
                   
                   
                 CTGACCTACGGCACCATGGTCTACGTGGCCCAGGCCGCGGCCGACGAAACCGGCCTGGACGCC 
               
               
                   
                   
                 GAGATCATCGACCTGCGCAGCCTCTGGCCGCTGGACCTGGAAACCATCGTCGCCTCGGTGAAG 
               
               
                   
                   
                 AAGACCGGCCGCTGCGTCATCGCCCACGAGGCGACCCGCACCTGTGGGTTCGGCGCCGAGCTG 
               
               
                   
                   
                 ATGTCGCTGGTGCAGGAGCACTGCTTCCACCACCTGGAGGCGCCGATCGAGCGCGTCACCGGT 
               
               
                   
                   
                 TGGGACACCCCCTACCCGCATGCCCAGGAGTGGGCGTATTTCCCCGGCCCCGCGCGCGTCGGC 
               
               
                   
                   
                 GCGGCATTCAAGCGTGTGATGGAGGTCTGAATGGGTACCCATGTGATCAAGATGCCGGACATC 
               
               
                   
                   
                 GGGGAAGGCATCGCCGAGGTCGAACTGGTGGAGTGGCATGTCCAGGTCGGCGACTCGGTCAAT 
               
               
                   
                   
                 GAAGACCAGGTCCTCGCCGAGGTGATGACCGACAAGGCCACGGTGGAGATTCCCTCGCCGGTG 
               
               
                   
                   
                 GCCGGACGCATCCTCGCCCTCGGCGGCCAGCCGGGCCAGGTGATGGCGGTGGGCGGCGAACTG 
               
               
                   
                   
                 ATCCGCCTGGAGGTGGAAGGCGCCGGCAACCTCGCCGAGAGTCCGGCCGCGGCGACGCCGGCC 
               
               
                   
                   
                 GCGCCCGTCGCCGCCACCCCGGAGAAACCGAAGGAAGCCCCGGTCGCGGCGCCGAAAGCCGCC 
               
               
                   
                   
                 GCCGAAGCGCCGCGCGCCTTGCGCGACAGCGAGGCGCCACGGCAGCGGCGCCAGCCCGGCGAA 
               
               
                   
                   
                 CGCCCGCTGGCCTCCCCCGCGGTGCGCCAGCGCGCCCGCGACCTGGGCATCGAGTTGCAGTTC 
               
               
                   
                   
                 GTGCAGGGCAGCGGTCCCGCCGGACGCGTCCTCCACGAGGACCTCGATGCCTACCTGACCCAG 
               
               
                   
                   
                 GATGGCAGCGTCGCGCGCAGCGGCGGCGCCGCGCAGGGGTATGCCGAGCGACACGACGAACAG 
               
               
                   
                   
                 GCGGTGCCGGTGATCGGCCTGCGTCGCAAGATCGCCCAGAAGATGCAGGACGCCAAGCGACGC 
               
               
                   
                   
                 ATCCCGCATTTCAGCTATGTCGAGGAAATCGACGTCACCGATCTGGAAGCCCTGCGCGCCCAT 
               
               
                   
                   
                 CTCAACCAGAAATGGGGTGGCCAGCGCGGCAAGCTGACCCTGCTGCCGTTCCTGGTCCGCGCC 
               
               
                   
                   
                 ATGGTCGTGGCGCTGCGCGACTTCCCGCAGTTGAACGCGCGCTACGACGACGAGGCCGAGGTG 
               
               
                   
                   
                 GTCACCCGCTACGGCGCGGTGCACGTCGGCATCGCCACCCAGAGCGACAACGGCCTGATGGTG 
               
               
                   
                   
                 CCGGTGCTGCGCCACGCCGAATCGCGCGACCTCTGGGGCAACGCCAGCGAAGTGGCGCGCCTG 
               
               
                   
                   
                 GCCGAAGCCGCACGCAGCGGCAAGGCGCAACGCCAGGAGCTGTCCGGCTCGACCATCACCCTG 
               
               
                   
                   
                 AGCAGCCTCGGCGTGCTCGGCGGGATCGTCAGCACACCGGTGATCAACCATCCGGAGGTGGCC 
               
               
                   
                   
                 ATCGTCGGCGTCAACCGCATCGTCGAGCGACCGATGGTGGTCGGCGGCAACATCGTCGTGCGC 
               
               
                   
                   
                 AAGATGATGAACCTCTCCTCCTCCTTCGACCACCGGGTGGTCGACGGGATGGACGCGGCGGCC 
               
               
                   
                   
                 TTCATCCAGGCCGTGCGCGGCCTGCTCGAACATCCCGCCACCCTGTTCCTGGAGTAAgcgATG 
               
               
                   
                   
                 AGCCAGATCCTGAAGACTTCCCTGCTGATCGTCGGCGGCGGTCCCGGCGGCTACGTCGCGGCG 
               
               
                   
                   
                 ATCCGTGCCGGGCAACTGGGCATTCCCACCGTACTGGTGGAGGGCGCCGCCCTCGGCGGCACC 
               
               
                   
                   
                 TGTCTGAACGTCGGCTGCATCCCGTCGAAGGCGCTGATCCACGCCGCCGAGGAATACCTCAAG 
               
               
                   
                   
                 GCCCGCCACTATGCCAGCCGGTCGGCGCTGGGCATCCAGGTACAGGCGCCGAGCATCGACATC 
               
               
                   
                   
                 GCCCGCACCGTGGAATGGAAGGACGCCATCGTCGACCGCCTCACCAGCGGCGTCGCCGCGCTG 
               
               
                   
                   
                 CTGAAGAAACACGGGGTCGATGTCGTCCAGGGCTGGGCGAGGATCCTCGACGGCAAAAGCGTG 
               
               
                   
                   
                 GCGGTCGAACTCGCCGGCGGCGGCAGCCAGCGCATCGAGTGCGAGCATCTGCTGCTGGCCGCC 
               
               
                   
                   
                 GGCTCGCAGAGCGTCGAGCTACCGATCCTGCCGCTGGGCGGCAAGGTGATCTCCTCCACCGAG 
               
               
                   
                   
                 GCGCTGGCGCCCGGCAGCCTGCCCAAGCGCCTGGTGGTGGTCGGCGGCGGCTACATCGGCCTG 
               
               
                   
                   
                 GAGCTGGGTACCGCCTACCGCAAGCTCGGCGTCGAGGTGGCGGTGGTGGAAGCGCAACCACGC 
               
               
                   
                   
                 ATCCTGCCGGGCTACGACGAAGAACTGACCAAGCCGGTGGCCCAGGCCTTGCGCAGGCTGGGC 
               
               
                   
                   
                 GTCGAGCTGTACCTCGGGCACAGCCTGCTGGGCCCGAGCGAGAACGGCGTGCGGGTCCGCGAC 
               
               
                   
                   
                 GGCGCCGGCGAGGAGCGCGAGATCGCCGCCGACCAGGTACTGGTGGCGGTCGGCCGCAAGCCG 
               
               
                   
                   
                 CGCAGCGAAGGCTGGAACCTGGAAAGCCTGGGCCTGGACATGAACGGCCGGGCGGTGAAGGTC 
               
               
                   
                   
                 GACGACCAGTGCCGCACCTCGATGCGCAATGTCTGGGCCATAGGCGATCTCGCCGGCGAGCCG 
               
               
                   
                   
                 ATGCTCGCGCACCGGGCCATGGCCCAGGGCGAGATGGTCGCCGAGCTGATCGCCGGCAAGCGT 
               
               
                   
                   
                 CGCCAGTTCGCCCCGGTGGCGATCCCCGCGGTGTGCTTCACCGATCCGGAAGTGGTGGTCGCC 
               
               
                   
                   
                 GGGTTGTCCCCGGAGCAGGCGAAGGATGCCGGCCTGGACTGCCTGGTGGCGAGCTTCCCGTTC 
               
               
                   
                   
                 GCCGCCAACGGTCGCGCCATGACCCTGGAGGCCAACGAAGGCTTCGTCCGCGTGGTGGCGCGT 
               
               
                   
                   
                 CGCGACAACCACCTGGTCGTCGGCTGGCAGGCGGTGGGCAAGGCGGTTTCGGAACTGTCCACG 
               
               
                   
                   
                 GCCTTCGCCCAGTCGCTGGAGATGGGCGCCCGCCTGGAAGACATCGCCGGCACCATCCACGCC 
               
               
                   
                   
                 CATCCGACCCTCGGCGAAGCGGTCCAGGAAGCCGCCCTGCGCGCGCTGGGACACGCCCTGCAC 
               
               
                   
                   
                 ATCTGA 
               
               
                   
               
               
                   8 
                 Tet-ldh-bkd 
                 gtaaaacgacggccagtgaattcgTTAAGACCCACTTTCACATTTAAGTTGTTTTTCTAATCC 
               
               
                   
                 construct 
                 GCATATGATCAATTCAAGGCCGAATAAGAAGGCTGGCTCTGCACCTTGGTGATCAAATAATTC 
               
               
                   
                 (gene coding 
                 GATAGCTTGTCGTAATAATGGCGGCATACTATCAGTAGTAGGTGTTTCCCTTTCTTCTTTAGC 
               
               
                   
                 regions are 
                 GACTTGATGCTCTTGATCTTCCAATACGCAACCTAAAGTAAAATGCCCCACAGCGCTGAGTGC 
               
               
                   
                 shown in 
                 ATATAATGCATTCTCTAGTGAAAAACCTTGTTGGCATAAAAAGGCTAATTGATTTTCGAGAGT 
               
               
                   
                 uppercase) 
                 TTCATACTGTTTTTCTGTAGGCCGTGTACCTAAATGTACTTTTGCTCCATCGCGATGACTTAG 
               
               
                   
                   
                 TAAAGCACATCTAAAACTTTTAGCGTTATTACGTAAAAAATCTTGCCAGCTTTCCCCTTCTAA 
               
               
                   
                   
                 AGGGCAAAAGTGAGTATGGTGCCTATCTAACATCTCAATGGCTAAGGCGTCGAGCAAAGCCCG 
               
               
                   
                   
                 CTTATTTTTTACATGCCAATACAATGTAGGCTGCTCTACACCTAGCTTCTGGGCGAGTTTACG 
               
               
                   
                   
                 GGTTGTTAAACCTTCGATTCCGACCTCATTAAGCAGCTCTAATGCGCTGTTAATCACTTTACT 
               
               
                   
                   
                 TTTATCTAATCTAGACATcattaattcctaatttttgttgacactctatcattgatagagtta 
               
               
                   
                   
                 ttttaccactccctatcagtgatagagaaaagtgaactctagaaataattttgtttaacttta 
               
               
                   
                   
                 agaaggagatatacatATGTTCGACATGATGGACGCGGCCCGGCTCGAGGGTCTgCACCTCGC 
               
               
                   
                   
                 CCAAGACCCGGCCACGGGACTCAAGGCCATTATCGCCATCCACAGCACGCGACTCGGCCCGGC 
               
               
                   
                   
                 GCTGGGTGGTTGTCGCTACCTGCCTTACCCCAACGACGAAGCCGCCATCGGCGACGCCATCCG 
               
               
                   
                   
                 CCTGGCCCAGGGCATGAGCTACAAGGCGGCCCTGGCCGGGCTGGAGCAGGGCGGCGGCAAGGC 
               
               
                   
                   
                 GGTGATCATCCGCCCGCCGCACCTGGACAATCGCGGCGCGCTGTTCGAGGCCTTCGGGCGCTT 
               
               
                   
                   
                 CATCGAAAGCCTCGGCGGACGCTACATCACTGCGGTGGACAGCGGTACCTCCAGCGCCGACAT 
               
               
                   
                   
                 GGACTGCATCGCCCAGCAGACCCGCCACGTCACCAGCACCACCCAGGCCGGCGACCCCTCGCC 
               
               
                   
                   
                 GCATACCGCCCTCGGCGTGTTCGCCGGGATTCGCGCCAGCGCCCAGGCGCGCCTCGGCAGCGA 
               
               
                   
                   
                 CGACCTGGAAGGCCTGCGGGTCGCGGTGCAGGGGCTCGGCCACGTCGGCTACGCATTGGCCGA 
               
               
                   
                   
                 GCAACTGGCGGCGGTCGGCGCCGAGCTGCTGGTCTGCGACCTCGATCCCGGCCGGGTGCAACT 
               
               
                   
                   
                 GGCCGTCGAGCAGCTCGGTGCCCATCCGCTGGCGCCGGAGGCATTGCTCTCCACCCCTTGCGA 
               
               
                   
                   
                 CATCCTCGCGCCCTGCGGCCTGGGCGGCGTGCTCACCAGCCAGAGCGTCAGCCAGTTGCGCTG 
               
               
                   
                   
                 CGCGGCGGTGGCCGGGGCGGCGAACAACCAGTTGGAGCGGCCGGAGGTCGCCGACGAGCTGGA 
               
               
                   
                   
                 GGCGCGCGGCATCCTCTATGCGCCGGACTACGTGATCAACTCCGGCGGCCTGATCTACGTCGC 
               
               
                   
                   
                 CCTCAAGCACCGCGGCGCCGATCCGCACAGCATCACCGCGCACCTGGCGCGGATTCCCGCGCG 
               
               
                   
                   
                 GCTCACCGAGATCTATGCCCATGCCCAGGCCGACCACCAGTCGCCGGCGCGGATCGCCGACCG 
               
               
                   
                   
                 TCTGGCGGAACGGATTCTCTACGGCCCGCAGTGAgaaggagatatacatATGAGTGATTACGA 
               
               
                   
                   
                 GCCGTTGCGTCTGCATGTCCCGGAGCCCACCGGGCGTCCTGGCTGCAAGACCGACTTTTCCTA 
               
               
                   
                   
                 TCTGCACCTGTCCCCCGCCGGCGAGGTACGCAAGCCGCCGGTGGATGTCGAGCCCGCCGAaAC 
               
               
                   
                   
                 CAGCGACCTGGCCTACAGCCTGGTACGTGTGCTCGACGACGACGGCCACGCCGTCGGTCCCTG 
               
               
                   
                   
                 GAATCCGCAGCTCAGCAACGAACAACTGCTGCGCGGCATGCGGGCGATGCTCAAGACCCGCCT 
               
               
                   
                   
                 GTTCGACGCGCGCATGCTCACCGCGCAACGGCAGAAAAAGCTTTCCTTCTATATGCAATGCCT 
               
               
                   
                   
                 CGGCGAGGAAGCCATCGCCACCGCCCACACCCTGGCCCTGCGCGACGGCGACATGTGCTTTCC 
               
               
                   
                   
                 GACCTATCGCCAGCAAGGCATCCTGATCACCCGCGAATACCCGCTGGTGGACATGATCTGCCA 
               
               
                   
                   
                 GCTTCTCTCCAACGAGGCCGACCCGCTCAAGGGCCGCCAGCTGCCGATCATGTACTCGAGCAA 
               
               
                   
                   
                 GGAGGCAGGTTTCTTCTCCATCTCCGGCAACCTCGCCACCCAGTTCATCCAGGCGGTCGGCTG 
               
               
                   
                   
                 GGGCATGGCCTCGGCGATCAAGGGCGACACGCGCATCGCCTCGGCCTGGATCGGCGACGGCGC 
               
               
                   
                   
                 CACCGCCGAGTCGGACTTCCACACCGCCCTCACCTTCGCCCATGTCTACCGCGCGCCGGTAAT 
               
               
                   
                   
                 CCTCAACGTGGTCAACAACCAGTGGGCGATCTCCACCTTCCAGGCCATCGCCGGCGGCGAAGG 
               
               
                   
                   
                 CACCACCTTCGCCAACCGTGGCGTGGGCTGCGGGATCGCCTCGCTGCGGGTCGACGGCAATGA 
               
               
                   
                   
                 CTTCCTGGCGGTCTACGCCGCCTCCGAGTGGGCCGCCGAGCGCGCCCGGCGCAACCTCGGGCC 
               
               
                   
                   
                 GAGCCTGATCGAATGGGTCACCTACCGCGCCGGCCCGCACTCGACTTCGGACGACCCGTCCAA 
               
               
                   
                   
                 GTACCGCCCCGCCGACGACTGGACCAACTTCCCGCTGGGCGACCCGATCGCCCGCCTGAAGCG 
               
               
                   
                   
                 GCACATGATCGGCCTCGGCATCTGGTCGGAGGAACAGCACGAAGCCACCCACAAGGCCCTCGA 
               
               
                   
                   
                 AGCCGAAGTACTGGCCGCGCAGAAACAGGCGGAGAGCCATGGCACCCTGATCGACGGCCGGGT 
               
               
                   
                   
                 GCCGAGCGCCGCCAGCATGTTCGAGGACGTCTATGCAGAACTGCCGGAGCAtCTGCGCCGGCA 
               
               
                   
                   
                 ACGCCAGGAGCTCGGGGTATGAATGCCATGAACCCGCAACACGAGAACGCCCAGACGGTCACC 
               
               
                   
                   
                 AGCATGACCATGATCCAGGCGCTGCGCTCGGCGATGGACATCATGCTCGAGCGCGACGACGAC 
               
               
                   
                   
                 GTGGTGGTATTCGGCCAGGACGTCGGCTACTTCGGCGGCGTGTTCCGCTGCACCGAAGGCCTG 
               
               
                   
                   
                 CAGAAGAAATACGGCACCTCGCGGGTGTTCGATGCGCCGATCTCCGAGAGCGGCATCATCGGC 
               
               
                   
                   
                 GCCGCGGTCGGCATGGGTGCCTACGGCCTGCGCCCGGTGGTGGAGATCCAGTTCGCCGACTAC 
               
               
                   
                   
                 GTCTACCCGGCCTCCGACCAGTTGATCTCCGAGGCGGCGCGCCTGCGCTATCGCTCGGCCGGC 
               
               
                   
                   
                 GACTTCATCGTGCCGATGACCGTACGCATGCCCTGTGGCGGCGGCATCTACGGCGGGCAAACG 
               
               
                   
                   
                 CACAGCCAGAGCCCGGAGGCGATGTTCACCCAGGTCTGCGGCCTGCGCACGGTGATGCCGTCC 
               
               
                   
                   
                 AACCCCTACGACGCCAAGGGCCTGCTGATCGCCTGCATCGAGAACGACGACCCGGTGATCTTC 
               
               
                   
                   
                 CTCGAGCCCAAGCGCCTCTACAACGGCCCGTTCGATGGCCACCACGACCGCCCGGTGACGCCC 
               
               
                   
                   
                 TGGTCCAAGCATCCGGCCAGCCAGGTGCCGGACGGCTACTACAAGGTGCCGCTGGACAAGGCG 
               
               
                   
                   
                 GCGATCGTCCGCCCCGGCGCGGCGCTGACCGTGCTGACCTACGGCACCATGGTCTACGTGGCC 
               
               
                   
                   
                 CAGGCCGCGGCCGACGAaACCGGCCTGGACGCCGAGATCATCGACCTGCGCAGCCTCTGGCCG 
               
               
                   
                   
                 CTGGACCTGGAAACCATCGTCGCCTCGGTGAAGAAGACCGGCCGCTGCGTCATCGCCCACGAG 
               
               
                   
                   
                 GCGACCCGCACCTGtGGGTTCGGCGCCGAGCTGATGTCGCTGGTGCAGGAGCACTGCTTCCAC 
               
               
                   
                   
                 CACCTGGAGGCGCCGATCGAGCGCGTCACCGGTTGGGACACCCCCTACCCGCATGCCCAGGAG 
               
               
                   
                   
                 TGGGCGTATTTCCCCGGCCCCGCGCGCGTCGGCGCGGCATTCAAGCGTGTGATGGAGGTCTGA 
               
               
                   
                   
                 ATGGGTACCCATGTGATCAAGATGCCGGACATCGGGGAAGGCATCGCCGAGGTCGAACTGGTG 
               
               
                   
                   
                 GAGTGGCATGTCCAGGTCGGCGACTCGGTCAATGAAGACCAGGTCCTCGCCGAGGTGATGACC 
               
               
                   
                   
                 GACAAGGCCACGGTGGAGATTCCCTCGCCGGTGGCCGGACGCATCCTCGCCCTCGGCGGCCAG 
               
               
                   
                   
                 CCGGGCCAGGTGATGGCGGTGGGCGGCGAACTGATCCGCCTGGAGGTGGAAGGCGCCGGCAAC 
               
               
                   
                   
                 CTCGCCGAGAGTCCGGCCGCGGCGACGCCGGCCGCGCCCGTCGCCGCCACCCCGGAGAAACCG 
               
               
                   
                   
                 AAGGAAGCCCCGGTCGCGGCGCCGAAAGCCGCCGCCGAAGCGCCGCGCGCCTTGCGCGACAGC 
               
               
                   
                   
                 GAGGCGCCACGGCAGCGGCGCCAGCCCGGCGAACGCCCGCTGGCCTCCCCCGCGGTGCGCCAG 
               
               
                   
                   
                 CGCGCCCGCGACCTGGGCATCGAGTTGCAGTTCGTGCAGGGCAGCGGTCCCGCCGGACGCGTC 
               
               
                   
                   
                 CTCCACGAGGACCTCGATGCCTACCTGACCCAGGATGGCAGCGTCGCGCGCAGCGGCGGCGCC 
               
               
                   
                   
                 GCGCAGGGGTATGCCGAGCGACACGACGAACAGGCGGTGCCGGTGATCGGCCTGCGTCGCAAG 
               
               
                   
                   
                 ATCGCCCAGAAGATGCAGGACGCCAAGCGACGCATCCCGCATTTCAGCTATGTCGAGGAAATC 
               
               
                   
                   
                 GACGTCACCGATCTGGAAGCCCTGCGCGCCCATCTCAACCAGAAATGGGGTGGCCAGCGCGGC 
               
               
                   
                   
                 AAGCTGACCCTGCTGCCGTTCCTGGTCCGCGCCATGGTCGTGGCGCTGCGCGACTTCCCGCAG 
               
               
                   
                   
                 TTGAACGCGCGCTACGACGACGAGGCCGAGGTGGTCACCCGCTACGGCGCGGTGCACGTCGGC 
               
               
                   
                   
                 ATCGCCACCCAGAGCGACAACGGCCTGATGGTGCCGGTGCTGCGCCACGCCGAATCGCGCGAC 
               
               
                   
                   
                 CTCTGGGGCAACGCCAGCGAAGTGGCGCGCCTGGCCGAAGCCGCACGCAGCGGCAAGGCGCAA 
               
               
                   
                   
                 CGCCAGGAGCTGTCCGGCTCGACCATCACCCTGAGCAGCCTCGGCGTGCTCGGCGGGATCGTC 
               
               
                   
                   
                 AGCACACCGGTGATCAACCATCCGGAGGTGGCCATCGTCGGCGTCAACCGCATCGTCGAGCGA 
               
               
                   
                   
                 CCGATGGTGGTCGGCGGCAACATCGTCGTGCGCAAGATGATGAACCTCTCCTCCTCCTTCGAC 
               
               
                   
                   
                 CACCGGGTGGTCGACGGGATGGACGCGGCGGCCTTCATCCAGGCCGTGCGCGGCCTGCTCGAA 
               
               
                   
                   
                 CATCCCGCCACCCTGTTCCTGGAGTAAgcgATGAGCCAGATCCTGAAGACTTCCCTGCTGATC 
               
               
                   
                   
                 GTCGGCGGCGGTCCCGGCGGCTACGTCGCGGCGATCCGTGCCGGGCAACTGGGCATTCCCACC 
               
               
                   
                   
                 GTACTGGTGGAGGGCGCCGCCCTCGGCGGCACCTGtCTGAACGTCGGCTGCATCCCGTCGAAG 
               
               
                   
                   
                 GCGCTGATCCACGCCGCCGAGGAATACCTCAAGGCCCGCCACTATGCCAGCCGGTCGGCGCTG 
               
               
                   
                   
                 GGCATCCAGGTACAGGCGCCGAGCATCGACATCGCCCGCACCGTGGAATGGAAGGACGCCATC 
               
               
                   
                   
                 GTCGACCGCCTCACCAGCGGCGTCGCCGCGCTGCTGAAGAAACACGGGGTCGATGTCGTCCAG 
               
               
                   
                   
                 GGCTGGGCGAGGATCCTCGACGGCAAAAGCGTGGCGGTCGAACTCGCCGGCGGCGGCAGCCAG 
               
               
                   
                   
                 CGCATCGAGTGCGAGCAtCTGCTGCTGGCCGCCGGCTCGCAGAGCGTCGAGCTACCGATCCTG 
               
               
                   
                   
                 CCGCTGGGCGGCAAGGTGATCTCCTCCACCGAGGCGCTGGCGCCCGGCAGCCTGCCCAAGCGC 
               
               
                   
                   
                 CTGGTGGTGGTCGGCGGCGGCTACATCGGCCTGGAGCTGGGTACCGCCTACCGCAAGCTCGGC 
               
               
                   
                   
                 GTCGAGGTGGCGGTGGTGGAAGCGCAACCACGCATCCTGCCGGGCTACGACGAAGAACTGACC 
               
               
                   
                   
                 AAGCCGGTGGCCCAGGCCTTGCGCAGGCTGGGCGTCGAGCTGTACCTCGGGCACAGCCTGCTG 
               
               
                   
                   
                 GGCCCGAGCGAGAACGGCGTGCGGGTCCGCGACGGCGCCGGCGAGGAGCGCGAGATCGCCGCC 
               
               
                   
                   
                 GACCAGGTACTGGTGGCGGTCGGCCGCAAGCCGCGCAGCGAAGGCTGGAACCTGGAAAGCCTG 
               
               
                   
                   
                 GGCCTGGACATGAACGGCCGGGCGGTGAAGGTCGACGACCAGTGCCGCACCTCGATGCGCAAT 
               
               
                   
                   
                 GTCTGGGCCATAGGCGATCTCGCCGGCGAGCCGATGCTCGCGCACCGGGCCATGGCCCAGGGC 
               
               
                   
                   
                 GAGATGGTCGCCGAGCTGATCGCCGGCAAGCGTCGCCAGTTCGCCCCGGTGGCGATCCCCGCG 
               
               
                   
                   
                 GTGTGCTTCACCGATCCGGAAGTGGTGGTCGCCGGGTTGTCCCCGGAGCAGGCGAAGGATGCC 
               
               
                   
                   
                 GGCCTGGACTGCCTGGTGGCGAGCTTCCCGTTCGCCGCCAACGGTCGCGCCATGACCCTGGAG 
               
               
                   
                   
                 GCCAACGAAGGCTTCGTCCGCGTGGTGGCGCGTCGCGACAACCACCTGGTCGTCGGCTGGCAG 
               
               
                   
                   
                 GCGGTGGGCAAGGCGGTtTCGGAACTGTCCACGGCCTTCGCCCAGTCGCTGGAGATGGGCGCC 
               
               
                   
                   
                 CGCCTGGAAGACATCGCCGGCACCATCCACGCCCATCCGACCCTCGGCGAAGCGGTCCAGGAA 
               
               
                   
                   
                 GCCGCCCTGCGCGCGCTGGGACACGCCCTGCACATCTGA 
               
               
                   
               
               
                   9 
                 Tet-livKHMGF 
                 ccagtgaattcgTTAAGACCCACTTTCACATTTAAGTTGTTTTTCTAATCCGCATATGATCAA 
               
               
                   
                 construct 
                 TTCAAGGCCGAATAAGAAGGCTGGCTCTGCACCTTGGTGATCAAATAATTCGATAGCTTGTCG 
               
               
                   
                 (gene coding 
                 TAATAATGGCGGCATACTATCAGTAGTAGGTGTTTCCCTTTCTTCTTTAGCGACTTGATGCTC 
               
               
                   
                 regions are 
                 TTGATCTTCCAATACGCAACCTAAAGTAAAATGCCCCACAGCGCTGAGTGCATATAATGCATT 
               
               
                   
                 shown in 
                 CTCTAGTGAAAAACCTTGTTGGCATAAAAAGGCTAATTGATTTTCGAGAGTTTCATACTGTTT 
               
               
                   
                 uppercase) 
                 TTCTGTAGGCCGTGTACCTAAATGTACTTTTGCTCCATCGCGATGACTTAGTAAAGCACATCT 
               
               
                   
                   
                 AAAACTTTTAGCGTTATTACGTAAAAAATCTTGCCAGCTTTCCCCTTCTAAAGGGCAAAAGTG 
               
               
                   
                   
                 AGTATGGTGCCTATCTAACATCTCAATGGCTAAGGCGTCGAGCAAAGCCCGCTTATTTTTTAC 
               
               
                   
                   
                 ATGCCAATACAATGTAGGCTGCTCTACACCTAGCTTCTGGGCGAGTTTACGGGTTGTTAAACC 
               
               
                   
                   
                 TTCGATTCCGACCTCATTAAGCAGCTCTAATGCGCTGTTAATCACTTTACTTTTATCTAATCT 
               
               
                   
                   
                 AGACATcattaattcctaatttttgttgacactctatcattgatagagttattttaccactcc 
               
               
                   
                   
                 ctatcagtgatagagaaaagtgaactctagaaataattttgtttaactttaagaaggagatat 
               
               
                   
                   
                 acatATGAAACGGAATGCGAAAACTATCATCGCAGGGATGATTGCACTGGCAATTTCACACAC 
               
               
                   
                   
                 CGCTATGGCTGACGATATTAAAGTCGCCGTTGTCGGCGCGATGTCCGGCCCGATTGCCCAGTG 
               
               
                   
                   
                 GGGCGATATGGAATTTAACGGCGCGCGTCAGGCAATTAAAGACATTAATGCCAAAGGGGGAAT 
               
               
                   
                   
                 TAAGGGCGATAAACTGGTTGGCGTGGAATATGACGACGCATGCGACCCGAAACAAGCCGTTGC 
               
               
                   
                   
                 GGTCGCCAACAAAATCGTTAATGACGGCATTAAATACGTTATTGGTCATCTGTGTTCTTCTTC 
               
               
                   
                   
                 TACCCAGCCTGCGTCAGATATCTATGAAGACGAAGGTATTCTGATGATCTCGCCGGGAGCGAC 
               
               
                   
                   
                 CAACCCGGAGCTGACCCAACGCGGTTATCAACACATTATGCGTACTGCCGGGCTGGACTCTTC 
               
               
                   
                   
                 CCAGGGGCCAACGGCGGCAAAATACATTCTTGAGACGGTGAAGCCCCAGCGCATCGCCATCAT 
               
               
                   
                   
                 TCACGACAAACAACAGTATGGCGAAGGGCTGGCGCGTTCGGTGCAGGACGGGCTGAAAGCGGC 
               
               
                   
                   
                 TAACGCCAACGTCGTCTTCTTCGACGGTATTACCGCCGGGGAGAAAGATTTCTCCGCGCTGAT 
               
               
                   
                   
                 CGCCCGCCTGAAAAAAGAAAACATCGACTTCGTTTACTACGGCGGTTACTACCCGGAAATGGG 
               
               
                   
                   
                 GCAGATGCTGCGCCAGGCCCGTTCCGTTGGCCTGAAAACCCAGTTTATGGGGCCGGAAGGTGT 
               
               
                   
                   
                 GGGTAATGCGTCGTTGTCGAACATTGCCGGTGATGCCGCCGAAGGCATGTTGGTCACTATGCC 
               
               
                   
                   
                 AAAACGCTATGACCAGGATCCGGCAAACCAGGGCATCGTTGATGCGCTGAAAGCAGACAAGAA 
               
               
                   
                   
                 AGATCCGTCCGGGCCTTATGTCTGGATCACCTACGCGGCGGTGCAATCTCTGGCGACTGCCCT 
               
               
                   
                   
                 TGAGCGTACCGGCAGCGATGAGCCGCTGGCGCTGGTGAAAGATTTAAAAGCTAACGGTGCAAA 
               
               
                   
                   
                 CACCGTGATTGGGCCGCTGAACTGGGATGAAAAAGGCGATCTTAAGGGATTTGATTTTGGTGT 
               
               
                   
                   
                 CTTCCAGTGGCACGCCGACGGTTCATCCACGGCAGCCAAGTGAtcatcccaccgcccgtaaaa 
               
               
                   
                   
                 tgcgggcgggtttagaaaggttaccttATGTCTGAGCAGTTTTTGTATTTCTTGCAGCAGATG 
               
               
                   
                   
                 TTTAACGGCGTCACGCTGGGCAGTACCTACGCGCTGATAGCCATCGGCTACACCATGGTTTAC 
               
               
                   
                   
                 GGCATTATCGGCATGATCAACTTCGCCCACGGCGAGGTTTATATGATTGGCAGCTACGTCTCA 
               
               
                   
                   
                 TTTATGATCATCGCCGCGCTGATGATGATGGGCATTGATACCGGCTGGCTGCTGGTAGCTGCG 
               
               
                   
                   
                 GGATTCGTCGGCGCAATCGTCATTGCCAGCGCCTACGGCTGGAGTATCGAACGGGTGGCTTAC 
               
               
                   
                   
                 CGCCCGGTGCGTAACTCTAAGCGCCTGATTGCACTCATCTCTGCAATCGGTATGTCCATCTTC 
               
               
                   
                   
                 CTGCAAAACTACGTCAGCCTGACCGAAGGTTCGCGCGACGTGGCGCTGCCGAGCCTGTTTAAC 
               
               
                   
                   
                 GGTCAGTGGGTGGTGGGGCATAGCGAAAACTTCTCTGCCTCTATTACCACCATGCAGGCGGTG 
               
               
                   
                   
                 ATCTGGATTGTTACCTTCCTCGCCATGCTGGCGCTGACGATTTTCATTCGCTATTCCCGCATG 
               
               
                   
                   
                 GGTCGCGCGTGTCGTGCCTGCGCGGAAGATCTGAAAATGGCGAGTCTGCTTGGCATTAACACC 
               
               
                   
                   
                 GACCGGGTGATTGCGCTGACCTTTGTGATTGGCGCGGCGATGGCGGCGGTGGCGGGTGTGCTG 
               
               
                   
                   
                 CTCGGTCAGTTCTACGGCGTCATTAACCCCTACATCGGCTTTATGGCCGGGATGAAAGCCTTT 
               
               
                   
                   
                 ACCGCGGCGGTGCTCGGTGGGATTGGCAGCATTCCGGGAGCGATGATTGGCGGCCTGATTCTG 
               
               
                   
                   
                 GGGATTGCGGAGGCGCTCTCTTCTGCCTATCTGAGTACGGAATATAAAGATGTGGTgTCATTC 
               
               
                   
                   
                 GCCCTGCTGATTCTGGTGCTGCTGGTGATGCCGACCGGTATTCTGGGTCGCCCGGAGGTAGAG 
               
               
                   
                   
                 AAAGTATGAAACCGATGCATATTGCAATGGCGCTGCTCTCTGCCGCGATGTTCTTTGTGCTGG 
               
               
                   
                   
                 CGGGCGTCTTTATGGGCGTGCAACTGGAGCTGGATGGCACCAAACTGGTGGTCGACACGGCTT 
               
               
                   
                   
                 CGGATGTCCGTTGGCAGTGGGTGTTTATCGGCACGGCGGTGGTCTTTTTCTTCCAGCTTTTGC 
               
               
                   
                   
                 GACCGGCTTTCCAGAAAGGGTTGAAAAGCGTTTCCGGACCGAAGTTTATTCTGCCCGCCATTG 
               
               
                   
                   
                 ATGGCTCCACGGTGAAGCAGAAACTGTTCCTCGTGGCGCTGTTGGTGCTTGCGGTGGCGTGGC 
               
               
                   
                   
                 CGTTTATGGTTTCACGCGGGACGGTGGATATTGCCACCCTGACCATGATCTACATTATCCTCG 
               
               
                   
                   
                 GTCTgGGGCTGAACGTGGTTGTTGGTCTTTCTGGTCTGCTGGTGCTGGGGTACGGCGGTTTTT 
               
               
                   
                   
                 ACGCCATCGGCGCTTACACTTTTGCGCTGCTCAATCACTATTACGGCTTGGGCTTCTGGACCT 
               
               
                   
                   
                 GCCTGCCGATTGCTGGATTAATGGCAGCGGCGGCGGGCTTCCTGCTCGGTTTTCCGGTGCTGC 
               
               
                   
                   
                 GTTTGCGCGGTGACTATCTGGCGATCGTTACCCTCGGTTTCGGCGAAATTGTGCGCATATTGC 
               
               
                   
                   
                 TGCTCAATAACACCGAAATTACCGGCGGCCCGAACGGAATCAGTCAGATCCCGAAACCGACAC 
               
               
                   
                   
                 TCTTCGGACTCGAGTTCAGCCGTACCGCTCGTGAAGGCGGCTGGGACACGTTCAGTAATTTCT 
               
               
                   
                   
                 TTGGCCTGAAATACGATCCCTCCGATCGTGTCATCTTCCTCTACCTGGTGGCGTTGCTGCTGG 
               
               
                   
                   
                 TGGTGCTAAGCCTGTTTGTCATTAACCGCCTGCTGCGGATGCCGCTGGGGCGTGCGTGGGAAG 
               
               
                   
                   
                 CGTTGCGTGAAGATGAAATCGCCTGCCGTTCGCTGGGCTTAAGCCCGCGTCGTATCAAGCTGA 
               
               
                   
                   
                 CTGCCTTTACCATAAGTGCCGCGTTTGCCGGTTTTGCCGGAACGCTGTTTGCGGCGCGTCAGG 
               
               
                   
                   
                 GCTTTGTCAGCCCGGAATCCTTCACCTTTGCCGAATCGGCGTTTGTGCTGGCGATAGTGGTGC 
               
               
                   
                   
                 TCGGCGGTATGGGCTCGCAATTTGCGGTGATTCTGGCGGCAATTTTGCTGGTGGTGTCGCGCG 
               
               
                   
                   
                 AGTTGATGCGTGATTTCAACGAATACAGCATGTTAATGCTCGGTGGTTTGATGGTGCTGATGA 
               
               
                   
                   
                 TGATCTGGCGTCCGCAGGGCTTGCTGCCCATGACGCGCCCGCAACTGAAGCTGAAAAACGGCG 
               
               
                   
                   
                 CAGCGAAAGGAGAGCAGGCATGAGTCAGCCATTATTATCTGTTAACGGCCTGATGATGCGCTT 
               
               
                   
                   
                 CGGCGGCCTGCTGGCGGTGAACAACGTCAATCTTGAACTGTACCCGCAGGAGATCGTCTCGTT 
               
               
                   
                   
                 AATCGGCCCTAACGGTGCCGGAAAAACCACGGTTTTTAACTGTCTGACCGGATTCTACAAACC 
               
               
                   
                   
                 CACCGGCGGCACCATTTTACTGCGCGATCAGCACCTGGAAGGTTTACCGGGGCAGCAAATTGC 
               
               
                   
                   
                 CCGCATGGGCGTGGTGCGCACCTTCCAGCATGTGCGTCTGTTCCGTGAAATGACGGTAATTGA 
               
               
                   
                   
                 AAACCTGCTGGTGGCGCAGCATCAGCAACTGAAAACCGGGCTGTTCTCTGGCCTGTTGAAAAC 
               
               
                   
                   
                 GCCATCCTTCCGTCGCGCCCAGAGCGAAGCGCTCGACCGCGCCGCGACCTGGCTTGAGCGCAT 
               
               
                   
                   
                 TGGTTTGCTGGAACACGCCAACCGTCAGGCGAGTAACCTGGCCTATGGTGACCAGCGCCGTCT 
               
               
                   
                   
                 TGAGATTGCCCGCTGCATGGTGACGCAGCCGGAGATTTTAATGCTCGACGAACCTGCGGCAGG 
               
               
                   
                   
                 TCTTAACCCGAAAGAGACGAAAGAGCTGGATGAGCTGATTGCCGAACTGCGCAATCATCACAA 
               
               
                   
                   
                 CACCACTATCTTGTTGATTGAACACGATATGAAGCTGGTGATGGGAATTTCGGACCGAATTTA 
               
               
                   
                   
                 CGTGGTCAATCAGGGGACGCCGCTGGCAAACGGTACGCCGGAGCAGATCCGTAATAACCCGGA 
               
               
                   
                   
                 CGTGATCCGTGCCTATTTAGGTGAGGCATAAGATGGAAAAAGTCATGTTGTCCTTTGACAAAG 
               
               
                   
                   
                 TCAGCGCCCACTACGGCAAAATCCAGGCGCTGCATGAGGTGAGCCTGCATATCAATCAGGGCG 
               
               
                   
                   
                 AGATTGTCACGCTGATTGGCGCGAACGGGGCGGGGAAAACCACCTTGCTCGGCACGTTATGCG 
               
               
                   
                   
                 GCGATCCGCGTGCCACCAGCGGGCGAATTGTGTTTGATGATAAAGACATTACCGACTGGCAGA 
               
               
                   
                   
                 CAGCGAAAATCATGCGCGAAGCGGTGGCGATTGTCCCGGAAGGGCGTCGCGTCTTCTCGCGGA 
               
               
                   
                   
                 TGACGGTGGAAGAGAACCTGGCGATGGGCGGTTTTTTTGCTGAACGCGACCAGTTCCAGGAGC 
               
               
                   
                   
                 GCATAAAGTGGGTGTATGAGCTGTTTCCACGTCTGCATGAGCGCCGTATTCAGCGGGCGGGCA 
               
               
                   
                   
                 CCATGTCCGGCGGTGAACAGCAGATGCTGGCGATTGGTCGTGCGCTGATGAGCAACCCGCGTT 
               
               
                   
                   
                 TGCTACTGCTTGATGAGCCATCGCTCGGTCTTGCGCCGATTATCATCCAGCAAATTTTCGACA 
               
               
                   
                   
                 CCATCGAGCAGCTGCGCGAGCAGGGGATGACTATCTTTCTCGTCGAGCAGAACGCCAACCAGG 
               
               
                   
                   
                 CGCTAAAGCTGGCGGATCGCGGCTACGTGCTGGAAAACGGCCATGTAGTGCTTTCCGATACTG 
               
               
                   
                   
                 GTGATGCGCTGCTGGCGAATGAAGCGGTGAGAAGTGCGTATTTAGGCGGGTAA 
               
               
                   
               
               
                  10 
                 livJ 
                 ATGAACATAAAGGGTAAAGCGTTACTGGCAGGATGTATCGCGCTGGCATTCAGCAATATGGCT 
               
               
                   
                 ( Escherichia   
                 CTGGCAGAAGATATTAAAGTCGCGGTCGTGGGCGCAATGTCCGGTCCGGTTGCGCAGTACGGT 
               
               
                   
                   coli ) 
                 GACCAGGAGTTTACCGGCGCAGAGCAGGCGGTTGCGGATATCAACGCTAAAGGCGGCATTAAA 
               
               
                   
                   
                 GGCAACAAACTGCAAATCGTAAAATATGACGATGCCTGTGACCCGAAACAGGCGGTTGCGGTG 
               
               
                   
                   
                 GCGAACAAAGTCGTTAACGACGGCATTAAATATGTGATTGGTCACCTCTGTTCTTCATCAACG 
               
               
                   
                   
                 CAGCCTGCGTCTGACATCTACGAAGACGAAGGCATTTTAATGATCACCCCAGCGGCAACCGCG 
               
               
                   
                   
                 CCGGAGCTGACCGCCCGTGGCTATCAGCTGATCCTGCGCACCACCGGCCTGGACTCCGACCAG 
               
               
                   
                   
                 GGGCCGACGGCGGCGAAATATATTCTTGAGAAAGTGAAACCGCAGCGTATTGCTATCGTTCAC 
               
               
                   
                   
                 GACAAACAGCAATACGGCGAAGGTCTGGCGCGAGCGGTGCAGGACGGCCTGAAGAAAGGCAAT 
               
               
                   
                   
                 GCAAACGTGGTGTTCTTTGATGGCATCACCGCCGGGGAAAAAGATTTCTCAACGCTGGTGGCG 
               
               
                   
                   
                 CGTCTGAAAAAAGAGAATATCGACTTCGTTTACTACGGCGGTTATCACCCGGAAATGGGGCAA 
               
               
                   
                   
                 ATCCTGCGTCAGGCACGCGCGGCAGGGCTGAAAACTCAGTTTATGGGGCCGGAAGGTGTGGCT 
               
               
                   
                   
                 AACGTTTCGCTGTCTAACATTGCGGGCGAATCAGCGGAAGGGCTGCTGGTGACCAAGCCGAAG 
               
               
                   
                   
                 AACTACGATCAGGTTCCGGCGAACAAACCCATTGTTGACGCGATCAAAGCGAAAAAACAGGAC 
               
               
                   
                   
                 CCAAGTGGCGCATTCGTTTGGACCACCTACGCCGCGCTGCAATCTTTGCAGGCGGGCCTGAAT 
               
               
                   
                   
                 CAGTCTGACGATCCGGCTGAAATCGCCAAATACCTGAAAGCGAACTCCGTGGATACCGTAATG 
               
               
                   
                   
                 GGACCGCTGACCTGGGATGAGAAAGGCGATCTGAAAGGCTTTGAGTTCGGCGTATTTGACTGG 
               
               
                   
                   
                 CACGCCAACGGCACGGCGACCGATGCGAAGTAA 
               
               
                   
               
               
                  11 
                 leucine 
                 GTGTTCGCTGAATACGGGGTTCTGAATTACTGGACCTATCTGGTTGGGGCCATTTTTATTGTG 
               
               
                   
                 exporter 
                 TTGGTGCCAGGGCCAAATACCCTGTTTGTACTCAAAAATAGCGTCAGTAGCGGTATGAAAGGC 
               
               
                   
                 gene leuE 
                 GGTTATCTTGCGGCCTGTGGTGTATTTATTGGCGATGCGGTATTGATGTTTCTGGCATGGGCT 
               
               
                   
                 ( Escherichia   
                 GGAGTGGCGACATTAATTAAGACCACCCCGATATTATTCAACATCGTACGTTATCTTGGTGCG 
               
               
                   
                   coli  Nissle 
                 TTTTATTTGCTCTATCTGGGGAGTAAAATTCTCTACGCGACCCTGAAAGGTAAAAATAGCGAG 
               
               
                   
                 1917) 
                 ACCAAATCCGATGAGCCCCAATACGGTGCCATTTTTAAACGCGCGTTAATTTTGAGCCTGACT 
               
               
                   
                   
                 AATCCGAAAGCCATTTTGTTCTATGTGTCGTTTTTCGTACAGTTTATCGATGTTAATGCCCCA 
               
               
                   
                   
                 CATACGGGAATTTCATTCTTTATTCTGGCGACGACGCTGGAACTGGTGAGTTTCTGCTATTTG 
               
               
                   
                   
                 AGCTTCCTGATTATTTCTGGGGCTTTTGTCACGCAGTACATACGTACCAAAAAGAAACTGGCT 
               
               
                   
                   
                 AAAGTGGGCAACTCACTGATTGGTTTGATGTTCGTGGGTTTCGCCGCCCGACTGGCGACGCTG 
               
               
                   
                   
                 CAATCCTGA 
               
               
                   
               
               
                  12 
                 Arginine 
                 ATGATGAAAG TGTTAATCGT GGAATCTGAA TTTCTGCACC AGGATACGTG 
               
               
                   
                 decarboxylase 
                 GGTCGGTAAC GCTGTTGAAC GTCTGGCCGA TGCTTTAAGC CAGCAAAATG 
               
               
                   
                 ( Escherichia   
                 TGACAGTTAT CAAATCCACC TCTTTTGACG ATGGCTTTGC CATTCTGTCA 
               
               
                   
                   coli ) 
                 AGCAATGAAG CCATCGATTG TCTGATGTTC TCGTACCAGA TGGAACACCC 
               
               
                   
                   
                 CGATGAGCAC CAAAATGTTC GTCAGCTGAT CGGCAAACTT CACGAACGTC 
               
               
                   
                   
                 AACAGAACGT ACCGGTCTTT CTGTTAGGCG ACCGCGAAAA GGCCTTGGCG 
               
               
                   
                   
                 GCTATGGATC GCGATCTGCT GGAGTTGGTC GACGAGTTTG CCTGGATTCT 
               
               
                   
                   
                 CGAGGATACG GCGGATTTTA TTGCCGGTCG CGCAGTCGCC GCCATGACGC 
               
               
                   
                   
                 GCTACCGCCA ACAGCTGCTC CCGCCGCTGT TTTCTGCCCT GATGAAATAC 
               
               
                   
                   
                 TCGGACATTC ACGAATACAG CTGGGCAGCT CCCGGGCACC AGGGCGGCGT 
               
               
                   
                   
                 TGGCTTCACG AAAACCCCAG CTGGTCGCTT TTATCATGAC TACTACGGCG 
               
               
                   
                   
                 AGAATTTATT TCGTACCGAC ATGGGCATTG AACGTACCAG CCTGGGCTCG 
               
               
                   
                   
                 CTGCTGGACC ACACGGGCGC TTTTGGGGAA TCAGAGAAAT ATGCAGCACG 
               
               
                   
                   
                 CGTGTTCGGT GCGGACCGCA GTTGGTCCGT CGTGGTGGGC ACCAGTGGTA 
               
               
                   
                   
                 GCAACCGCAC CATTATGCAG GCGTGCATGA CCGATAATGA TGTGGTAGTG 
               
               
                   
                   
                 GTGGATCGCA ATTGTCATAA GAGCATCGAA CAAGGCTTGA TGCTGACTGG 
               
               
                   
                   
                 CGCTAAACCA GTCTATATGG TGCCGTCCCG TAATCGCTAT GGTATTATCG 
               
               
                   
                   
                 GCCCGATTTA TCCTCAGGAG ATGCAGCCGG AAACCCTCCA GAAGAAAATC 
               
               
                   
                   
                 TCAGAGTCCC CGTTAACTAA AGATAAAGCT GGGCAAAAAC CGAGTTATTG 
               
               
                   
                   
                 TGTAGTAACT AATTGTACGT ATGATGGTGT TTGCTATAAC GCTAAGGAGG 
               
               
                   
                   
                 CCCAAGATCT TCTGGAAAAA ACAAGTGATC GTCTTCATTT TGATGAAGCT 
               
               
                   
                   
                 TGGTACGGTT ATGCGCGTTT CAACCCTATT TACGCCGACC ACTATGCGAT 
               
               
                   
                   
                 GCGTGGTGAA CCTGGGGATC ATAATGGCCC TACTGTGTTT GCCACCCATT 
               
               
                   
                   
                 CTACGCATAA ACTCCTGAAT GCGTTGTCAC AGGCGAGTTA CATCCACGTA 
               
               
                   
                   
                 CGCGAAGGCC GTGGCGCTAT TAATTTTAGC CGCTTTAACC AGGCCTATAT 
               
               
                   
                   
                 GATGCACGCG ACGACAAGTC CGCTGTATGC GATTTGCGCG TCCAACGATG 
               
               
                   
                   
                 TTGCGGTCAG CATGATGGAC GGCAACAGCG GTCTGTCGTT AACCCAGGAA 
               
               
                   
                   
                 GTGATTGATG AAGCGGTCGA CTTTCGCCAG GCGATGGCCC GTCTGTACAA 
               
               
                   
                   
                 AGAATTCACC GCCGATGGCT CGTGGTTCTT CAAACCCTGG AATAAAGAAG 
               
               
                   
                   
                 TCGTGACTGA CCCGCAGACG GGCAAAACTT ATGATTTTGC AGATGCCCCG 
               
               
                   
                   
                 ACGAAGCTTC TTACTACGGT CCAGGATTGC TGGGTGATGC ACCCGGGGGA 
               
               
                   
                   
                 GTCTTGGCAT GGCTTCAAAG ATATCCCTGA TAACTGGTCT ATGCTCGACC 
               
               
                   
                   
                 CAATCAAAGT TTCAATTTTA GCTCCAGGCA TGGGCGAAGA TGGCGAACTG 
               
               
                   
                   
                 GAAGAGACGG GGGTACCAGC TGCGTTGGTT ACCGCCTGGT TAGGCCGCCA 
               
               
                   
                   
                 TGGTATTGTT CCAACACGTA CCACTGATTT TCAGATTATG TTTCTGTTCA 
               
               
                   
                   
                 GTATGGGTGT GACGCGCGGT AAATGGGGGA CGCTGGTCAA CACTCTCTGC 
               
               
                   
                   
                 TCCTTTAAAC GCCATTATGA TGCGAACACG CCCCTGGCGC AAGTCATGCC 
               
               
                   
                   
                 AGAGCTGGTG GAACAATACC CTGATACTTA TGCGAACATG GGTATCCACG 
               
               
                   
                   
                 ATCTGGGAGA TACTATGTTC GCCTGGCTTA AAGAAAATAA CCCGGGGGCC 
               
               
                   
                   
                 CGCCTGAACG AAGCATATAG TGGCCTGCCC ATGGCGGAAA TTACTCCGCG 
               
               
                   
                   
                 TGAAGCCTAT AATGCCATCG TTGATAATAA CGTCGAATTA GTATCCATCG 
               
               
                   
                   
                 AGAACCTCCC CGGTCGTATT GCGGCAAATA GCGTAATCCC GTACCCGCCG 
               
               
                   
                   
                 GGTATTCCCA TGCTGCTCAG CGGCGAAAAC TTCGGTGATA AAAATTCCCC 
               
               
                   
                   
                 GCAAGTTTCT TATCTGCGCA GCCTGCAATC GTGGGACCAT CACTTTCCCG 
               
               
                   
                   
                 GGTTTGAGCA TGAAACTGAA GGGACAGAGA TCATCGATGG CATTTATCAT 
               
               
                   
                   
                 GTGATGTGCG TCAAGGCG 
               
               
                   
               
               
                  13 
                 ArgT 
                 ATGAAAAAAA GCATCCTCGC GCTGTCACTG TTAGTGGGTC TCAGCGCCGC 
               
               
                   
                 ( Escherichia   
                 GGCCAGCAGC TATGCTGCTC TTCCTGAAAC GGTGCGCATC GGGACGGATA 
               
               
                   
                   coli ) 
                 CCACTTATGC ACCGTTTAGC AGCAAAGATG CTAAAGGAGA CTTCGTAGGG 
               
               
                   
                   
                 TTTGATATCG ATTTAGGCAA CGAGATGTGC AAACGTATGC AAGTGAAATG 
               
               
                   
                   
                 TACCTGGGTG GCTTCAGACT TTGATGCATT AATCCCGAGT TTGAAAGCAA 
               
               
                   
                   
                 AAAAAATTGA CGCAATTATT TCGAGCCTGA GCATTACAGA TAAGCGCCAA 
               
               
                   
                   
                 CAAGAAATTG CCTTCTCAGA TAAATTATAT GCCGCTGATT CGCGTCTTAT 
               
               
                   
                   
                 CGCGGCTAAA GGCTCCCCTA TCCAACCAAC GTTGGACAGC CTGAAGGGGA 
               
               
                   
                   
                 AACATGTAGG GGTTCTGCAA GGGTCCACGC AGGAAGCTTA CGCCAATGAA 
               
               
                   
                   
                 ACCTGGCGTT CGAAAGGGGT CGATGTGGTG GCGTACGCCA ATCAGGACTT 
               
               
                   
                   
                 GGTGTATTCC GATCTGGCCG CAGGTCGTCT GGACGCAGCT CTGCAGGACG 
               
               
                   
                   
                 AAGTGGCGGC GAGTGAGGGT TTCCTGAAAC AGCCAGCAGG CAAAGATTTT 
               
               
                   
                   
                 GCGTTCGCCG GCTCGAGTGT AAAGGATAAA AAATATTTCG GGGATGGCAC 
               
               
                   
                   
                 GGGTGTCGGT TTACGCAAAG ATGATGCAGA ACTGACCGCG GCGTTTAATA 
               
               
                   
                   
                 AAGCCCTTGG CGAACTGCGC CAAGACGGCA CATATGATAA AATGGCGAAA 
               
               
                   
                   
                 AAGTACTTTG ACTTCAATGT TTATGGTGAT 
               
               
                   
               
               
                  14 
                 artP 
                 ATGTCTATTC AATTAAATGG CATCAACTGT TTCTACGGTG CACATCAAGC 
               
               
                   
                 ( Escherichia   
                 CTTATTTGAC ATCACGCTTG ATTGCCCGCA AGGGGAGACA CTGGTGCTGC 
               
               
                   
                   coli ) 
                 TGGGCCCGAG TGGAGCCGGC AAATCGTCGT TGCTGCGGGT GTTGAACCTG 
               
               
                   
                   
                 TTGGAGATGC CGCGCTCAGG CACCCTGAAT ATCGCGGGCA ACCATTTCGA 
               
               
                   
                   
                 TTTTACGAAA ACACCGTCCG ATAAAGCTAT TCGTGATCTT CGTCGCAACG 
               
               
                   
                   
                 TCGGCATGGT GTTTCAGCAG TATAATTTAT GTGCTCATCT GACGGTTCAG 
               
               
                   
                   
                 CAAAATCTGA TCGAAGCACC GTGTCGTGTG TTGGGCCTGA GCAAAGACCA 
               
               
                   
                   
                 AGCCCTGGCC AGCGCAGAAA AATTATTAGA GCGCCTGCGC TTGAAACCAT 
               
               
                   
                   
                 ATTCGGATCG GTACCCACTT CACTTAAGCG GGGGCCAGCA ACAGCGCGTT 
               
               
                   
                   
                 GCCATCGCTC GTGCGCTGAT GATGGAGCCG CAAGTTCTCC TTTTTGATGA 
               
               
                   
                   
                 ACCTACCGCA GCGCTTGATC CGGAGATCAC GGCGCAGATC GTCAGCATCA 
               
               
                   
                   
                 TTCGTGAACT CGCTGAGACG AATATTACAC AAGTTATTGT GACACATGAG 
               
               
                   
                   
                 GTAGAAGTGG CTCGCAAGAC CGCGTCTCGC GTAGTGTATA TGGAAAACGG 
               
               
                   
                   
                 TCATATCGTG GAGCAAGGGG ACGCCTCATG TTTTACAGAG CCGCAGACAG 
               
               
                   
                   
                 AGGCATTCAA AAATTATCTG AGCCAC 
               
               
                   
               
               
                  15 
                 artI 
                 ATGAAAAAAG TGCTTATTGC CGCCCTGATT GCGGGCTTCT CTCTGTCTGC 
               
               
                   
                 ( Escherichia   
                 CACCGCGGCC GAAACCATCC GTTTTGCCAC TGAAGCGTCA TATCCCCCTT 
               
               
                   
                   coli ) 
                 TCGAAAGCAT TGACGCCAAC AACCAAATTG TCGGTTTCGA CGTTGACCTC 
               
               
                   
                   
                 GCGCAGGCCC TGTGCAAAGA AATTGATGCC ACCTGCACCT TCTCTAACCA 
               
               
                   
                   
                 AGCGTTTGAC TCATTGATTC CTTCGCTGAA ATTTCGTCGC GTGGAAGCCG 
               
               
                   
                   
                 TCATGGGCGG CATGGATATC ACCCCCGAGC GCGAAAAACA GGTCTTGTTT 
               
               
                   
                   
                 ACTACACCGT ACTACGACAA CTCGGCTTTG TTTGTCGGCC AGCAAGGCAA 
               
               
                   
                   
                 GTATACTTCT GTCGACCAGC TGAAAGGTAA AAAAGTCCGT TCAGTCCAGA 
               
               
                   
                   
                 ACGGCACCAC TCACCAGAAA TTCATCATGG ACAAACATCC TGAGATCACT 
               
               
                   
                   
                 ACCGTGCCGT ATGATTCTTA CCAGAACGCG AAGTTAGATC TGGAAAATGG 
               
               
                   
                   
                 TCGGATTGAT GGCGTCTTTG GCGACACCGC TGTGGTACAT GAATGGCTGA 
               
               
                   
                   
                 AAGACAATCC TAAATTAGTG GTTGTGGGAG ATAAGGTTAC GGATAAGGAT 
               
               
                   
                   
                 TATTTTGGCA CCGGTCTCGG CATTGCAGTC CGCCAAGGTA ATACCGAATT 
               
               
                   
                   
                 GCAACAGAAA TTGAATACCG CGCTGGAAAA AGTGAAAAAA GACGGTACAT 
               
               
                   
                   
                 ACGAAACCAT TTACAACAAA TGGTTTCAAA AA 
               
               
                   
               
               
                  16 
                 artQ 
                 ATGAACGAAT TCTTCCCTCT CGCGTCTGCG GCAGGTATGA CCGTGGGTTT 
               
               
                   
                 ( Escherichia   
                 GGCGGTTTGT GCGCTGATTG TCGGTCTCGC TCTGGCAATG TTCTTTGCCG 
               
               
                   
                   coli ) 
                 TATGGGAGTC AGCGAAATGG CGTCCGGTCG CCTGGGCAGG TTCCGCCCTG 
               
               
                   
                   
                 GTAACCATTC TGCGTGGTCT GCCAGAGATC CTGGTAGTTC TGTTTATCTA 
               
               
                   
                   
                 CTTTGGCTCT TCTCAGTTAC TGTTAACACT GTCTGACGGG TTTACGATTA 
               
               
                   
                   
                 ACCTGGGTTT TGTCCAGATT CCGGTCCAGA TGGATATTGA AAATTTCGAC 
               
               
                   
                   
                 GTCTCCCCTT TTCTCTGTGG CGTCATCGCG CTGAGCTTGC TCTACGCTGC 
               
               
                   
                   
                 ATATGCATCA CAGACCCTTC GTGGTGCATT AAAAGCGGTG CCAGTAGGAC 
               
               
                   
                   
                 AGTGGGAAAG CGGCCAGGCC CTTGGCCTGA GCAAGAGCGC AATTTTTTTC 
               
               
                   
                   
                 CGCCTTGTTA TGCCGGCCGA TGTCCGCCAT GCGTTACCAG GTCTGGGTAA 
               
               
                   
                   
                 TCAATGGCTG GTGTTGTTGA AAGACACCGC CCTTGTCTCG CTGATTAGCG 
               
               
                   
                   
                 TGAACGATTT AATGCTGCAA ACCAAATCGA TTGCAACCCG CACTCAGGAA 
               
               
                   
                   
                 CCGTTTACCT GGTACATCGT GGCGGCAGCA ATCTATCTGG TGATCACACT 
               
               
                   
                   
                 TCTGAGCCAG TATATTTTAA AACGTATTGA CCTGCGTGCC ACCCGCTTTG 
               
               
                   
                   
                 AGCGCCGCCC TAGC 
               
               
                   
               
               
                  17 
                 artM 
                 ATGTTTGAAT ATCTGCCGGA ACTGATGAAA GGTTTGCATA CTAGTCTGAC 
               
               
                   
                 ( Escherichia   
                 GCTGACCGTC GCGAGTCTGA TCGTTGCGCT TATCCTGGCA CTGATCTTCA 
               
               
                   
                   coli ) 
                 CCATTATTCT GACTCTCAAG ACCCCGGTCC TGGTGTGGCT GGTCCGCGGT 
               
               
                   
                   
                 TACATTACCT TATTCACCGG GACCCCGCTC TTGGTTCGCA TTTTTCTTAT 
               
               
                   
                   
                 TTACTATGGT CCGGGTCAGT TTCCGACCTT GCAAGAATAT CCTGCGTTAT 
               
               
                   
                   
                 GGCACCTGCT GTCTGAACCG TGGCTGTGCG CTCTGATTGC TCTGAGTGTT 
               
               
                   
                   
                 AACTCGGCGG CCTATACGAC ACAGCTGTTC TACGGTGCTA TTCGTGCGAT 
               
               
                   
                   
                 CCCAGAAGGT CAATGGCAGT CTTGTAGCGC ACTGGGCATG TCAAAGAAAG 
               
               
                   
                   
                 ATACTCTTGC TATTCTGCTG CCGTACGCTT TTAAACGCTC TCTGAGCTCG 
               
               
                   
                   
                 TACAGCAATG AAGTTGTCCT GGTTTTCAAA AGCACTAGCT TAGCGTATAC 
               
               
                   
                   
                 GATCACGCTG ATGGAAGTCA TGGGTTATAG CCAGTTATTA TATGGTCGCA 
               
               
                   
                   
                 CGTACGACGT CATGGTGTTT GGTGCAGCGG GCATTATCTA TCTTGTAGTT 
               
               
                   
                   
                 AATGGATTAC TGACGTTAAT GATGCGCTTG ATCGAACGCA AAGCCGTGGC 
               
               
                   
                   
                 ATTCGAGCGG CGTAAT 
               
               
                   
               
               
                  18 
                 artJ 
                 ATGAAAAAAT TGGTGCTTGC AGCACTGCTG GCCAGTTTCA CTTTCGGCGC 
               
               
                   
                 ( Escherichia   
                 TTCGGCGGCC GAAAAGATTA ATTTCGGTGT CAGCGCAACT TACCCACCGT 
               
               
                   
                   coli ) 
                 TCGAAAGCAT CGGTGCGAAC AATGAGATTG TAGGATTTGA TATCGATCTG 
               
               
                   
                   
                 GCCAAAGCGT TATGCAAACA AATGCAAGCG GAGTGCACTT TTACCAATCA 
               
               
                   
                   
                 TGCGTTTGAT AGCCTGATCC CGTCGCTGAA GTTCCGTAAA TACGACGCCG 
               
               
                   
                   
                 TGATTTCGGG GATGGACATC ACCCCTGAGC GCTCGAAACA GGTGAGCTTC 
               
               
                   
                   
                 ACCACTCCAT ATTATGAAAA CTCAGCGGTG GTGATTGCGA AAAAAGACAC 
               
               
                   
                   
                 CTATAAAACA TTTGCCGACC TGAAAGGGAA ATGTATTGGT ATGGAGAACG 
               
               
                   
                   
                 GCACCACCCA TCAGAAGTAT ATTCAAGACC AGCACCCGGA GGTTAAGACC 
               
               
                   
                   
                 GTAAGCTACG ACTCCTACCA GAATGCTTTC ATTGATTTAA AAAATGGTCG 
               
               
                   
                   
                 TATTGATGGT GTATTCGGAG ATACAGCCGT GGTGAATGAG TGGCTGAAAA 
               
               
                   
                   
                 CCAATCCGCA GTTGGGTGTT GCGACCGAAA AAGTGACAGA TCCACAATAC 
               
               
                   
                   
                 TTTGGGACTG GCCTGGGCAT CGCGGTGCGC CCGGATAACA AAGCCCTGTT 
               
               
                   
                   
                 GGAGAAACTG AACAACGCGT TAGCTGCGAT TAAAGCGGAT GGGACCTATC 
               
               
                   
                   
                 AGAAGATTTC AGACCAATGG TTCCCGCAA 
               
               
                   
               
               
                  19 
                 ArgO 
                 ATGTTCTCGT ACTATTTCCA AGGCTTAGCA CTGGGTGCGG CCATGATCTT 
               
               
                   
                 ( Escherichia   
                 ACCGCTGGGC CCACAAAACG CTTTTGTTAT GAACCAGGGA ATCCGCCGGC 
               
               
                   
                   coli ) 
                 AGTACCATAT CATGATTGCG CTGCTGTGTG CCATCTCGGA TCTGGTCCTG 
               
               
                   
                   
                 ATTTGCGCCG GTATTTTTGG CGGGTCGGCG TTACTTATGC AAAGCCCTTG 
               
               
                   
                   
                 GCTGCTGGCG CTGGTAACGT GGGGCGGCGT AGCATTTCTG CTTTGGTATG 
               
               
                   
                   
                 GATTCGGCGC CTTCAAAACT GCGATGAGTT CGAATATCGA GCTTGCGAGT 
               
               
                   
                   
                 GCTGAGGTAA TGAAACAGGG CCGTTGGAAA ATTATTGCGA CCATGTTAGC 
               
               
                   
                   
                 CGTGACTTGG TTGAACCCGC ACGTGTACCT GGATACTTTT GTGGTGTTGG 
               
               
                   
                   
                 GTTCACTCGG TGGGCAATTA GATGTGGAAC CGAAACGCTG GTTTGCCTTG 
               
               
                   
                   
                 GGCACAATCT CGGCCAGTTT TTTGTGGTTC TTCGGGCTGG CGCTGCTGGC 
               
               
                   
                   
                 CGCGTGGCTG GCACCACGTT TACGCACCGC CAAGGCCCAG CGCATCATCA 
               
               
                   
                   
                 ACTTAGTCGT GGGCTGTGTG ATGTGGTTCA TTGCTCTGCA ACTGGCGCGC 
               
               
                   
                   
                 GATGGCATTG CGCACGCCCA GGCCCTGTTC TCA 
               
               
                   
               
               
                  20 
                 [001] 
                 ATGATGCGCT TTGGCATCAT TAAAGAACGT AAGAACCCGC CAGATCGTCG 
               
               
                   
                 monofunotional 
                 TGTAGTGTTT ACACCGTCCG AACTGATCAA ACTGAAAGAA CAGTTTCCGC 
               
               
                   
                 lysine- 
                 TGGCCGAAAT TAAGGTGGAA TCCTCAGATA TTCGCATTTT TTCTGATGAT 
               
               
                   
                 ketoglutarate 
                 GAGTATCGTA AACTTGGATT TGAAGTAACC GATGACCTGA GTGATTGTGA 
               
               
                   
                 reductase 
                 TGTCTTGATT GGCGTGAAAG AAGTACCGAT CGATGCCCTG CTGCCCGGGA 
               
               
                   
                 ( Flavobacterium   
                 AAAAGTATTT TTTTTTCTCT CACACAATTA AAAAACAGCC TTACAATAAA 
               
               
                   
                 
                   limnosediminis 
                 
                 AAACTGCTGA TCGCCTGCTT GGAAAAAAAC ATCCGTCTGA TTGATCATGA 
               
               
                   
                 JC2902) 
                 GACGATCGTG AATGAAGATA ATCATCGTTT GATTGGGTTC GGCCGTTACG 
               
               
                   
                   
                 CAGGTATCGT GGGGGCCTAT AACGGTTTCC GTGCTTTTGG TATTAAGTAC 
               
               
                   
                   
                 GAGCTCTTTA ACCTGCCCAA AGCGGAAACC TTAGCGGACA AAACGGCACT 
               
               
                   
                   
                 TGTGGAACGC CTGCGTCGGC CGATGCTGCC GCCAATCAAA ATTGTGTTGA 
               
               
                   
                   
                 CCGGTCACGG CAAAGTAGGT ATGGGTGCAA AAGAGATTCT GGATGCCATG 
               
               
                   
                   
                 AAAATCAAAC AAGTTTCCGT GGAGGACTAC TTAACAAAAA CCTATGACAA 
               
               
                   
                   
                 GCCGGTGTAT ACGCAGATCG ACGTTCTGGA CTATAACAAG CGGAAAGATG 
               
               
                   
                   
                 GCAAACCGGC GGAACGTGAA CACTTTTATG CCAATCCGCA GGAGTATGTC 
               
               
                   
                   
                 TCGGACTTCG AACGCTTTAC CAAGGTGTCG GATCTGTTCA TCGCAGGCCA 
               
               
                   
                   
                 TTTCTATGGC AACGGTGCAC CGGTAATTCT GACTCGCACC ATGCTTAACG 
               
               
                   
                   
                 CTTCTGATAA TAAAATTAAA GTAGTTGCGG ATATTAGCTG TGATGTCGGT 
               
               
                   
                   
                 GGCCCTATCG AATGTACGCT GCGCAGCAGC ACCATCGCAG AGCCGTTTTA 
               
               
                   
                   
                 TGGTTATTAT CCTTCCGAAG GTAAAGAAGT CGACGTCAAC CATCCGGGCG 
               
               
                   
                   
                 CGGTGGTTGT GATGGCGGTG GACAATCTGC CCTGCGAGCT GCCTAAAGAT 
               
               
                   
                   
                 GCCAGCGAGG GTTTCGGAGA AATGTTTCTC AAACATGTGA TTCCAGCCTT 
               
               
                   
                   
                 CTACAACAAC GATAAGGACG GCATTCTTGA GCGGGCCAAA ATCACCGAAA 
               
               
                   
                   
                 ACGGCAAATT AACAAAACGC TTCTCCTACT TACAGGACTA TGTCGATGGT GAA 
               
               
                   
               
               
                  21 
                 saccharopine 
                 ATGCGTAATA TTTTGATTAT CGGCGCCGGT CGGTCCGCTT CCTCGCTGAT 
               
               
                   
                 dehydrogenase 
                 TCAGTACTTA TTGAATAAGT CCCAAGAAGA ACAGCTGCAT TTAACCATTG 
               
               
                   
                 ( Flavobacterium   
                 CCGATTTATC ACTCGAACTG GCTCAGAAGA AAACCAATAA CCATCCGAAC 
               
               
                   
                 sp. EM1321) 
                 GCTACCGCGC TGGCGCTGGA TATTTATAAT AAGGATGAAC GTCGTGCGGC 
               
               
                   
                 [002] 
                 CATCGAGAAA GCGGCCATTG TGATCAGCAT GTTGCCAGCG CATCTGCATA 
               
               
                   
                   
                 TCGAAATCGC CCGGGATTGC CTGTATTTTA AAAAGAACCT TGTTACGGCG 
               
               
                   
                   
                 AGCTATATTA GTGACGCGAT GCAGGAGCTT GATGCGGAAG TTAAAGAGAA 
               
               
                   
                   
                 CAAACTGATC TTTATGAATG AGGTCGGTTT AGACCCGGGT ATTGATCATA 
               
               
                   
                   
                 TGAGCGCCAT GAAAGTCATC GATGAAATTC GGGAACAAGG CGGCAAAATG 
               
               
                   
                   
                 CTTCTCTTCG AAAGTTTTTG CGGCGGCCTG GTGGCACCAG AATCAGATAA 
               
               
                   
                   
                 CAATTTATGG AACTATAAAT TTACCTGGGC CCCACGTAAC GTAGTTCTGG 
               
               
                   
                   
                 CTGGCCAGGG TGGTGTGGCA AAATTCATTC AAGAAGGCAC CTATAAATAT 
               
               
                   
                   
                 ATCCCGTATG ACAGCTTATT TCGCCGGACC GAGTTTCTGG AAGTAGAAGG 
               
               
                   
                   
                 ATACGGGCGT TTCGAAGCTT ATTCGAATCG CGATTCTCTC AAATATCGGA 
               
               
                   
                   
                 GTATTTATGG GCTCGATGAC GTTCTCACCC TGTTTCGTGG TACAATCCGT 
               
               
                   
                   
                 CGCGTTGGCT TCTCCAAAGC TTGGAACATG TTTGTGCAAC TGGGCATGAC 
               
               
                   
                   
                 GGACGACAGC TATGTTATGG AAGATTCTGA GAATATGTCC TATCGTCAAT 
               
               
                   
                   
                 TTATTAACTC ATTCCTGCCT TATCACCCAA CCGATAGCGT TGAAATTAAG 
               
               
                   
                   
                 ACCCGTTTTT TGTTAAAAAT CGATCAGGAT GATATCATGT GGGACAAACT 
               
               
                   
                   
                 GCTGGAACTG GATCTTTTCA ACGATAAAAA AATGGTTGGG TTGAAAAATG 
               
               
                   
                   
                 CGACGCCGGC ACAGATCCTG GAGAAAATCC TGAACGATTC GTGGACCCTG 
               
               
                   
                   
                 CAACCGGAAG ATAAAGATAT GATCGTGATG TATCATAAAT TTGGTTACCA 
               
               
                   
                   
                 GATCAACGGC GAAAAAGTGC AGATGGATTC ACAGATGGTG TGTATCGGCC 
               
               
                   
                   
                 AGGACCAAAC GTATACCGCG ATGGCAAAAA CCGTCGGCCT GCCTGTGGCA 
               
               
                   
                   
                 ATGGCAACTC TGCTGATTCT GAACGGTAAA ATCAAAACAA CGGGAGTTCA 
               
               
                   
                   
                 GTTGCCAATC AATAAAGAAG TTTACCTGCC GGTCCTGGAG GAACTGGAGA 
               
               
                   
                   
                 AATATGGCGT TGTGTTCAAA GAACAGATGC TCCCATATCT TGGATACAAA TATAGT 
               
               
                   
               
               
                  22 
                 Lysine 
                 ATG AAG AAA AAT CAT TCC TTG CAG TCG CTT AAA AAC CAA GAT GAG CGT 
               
               
                   
                 aminotransferase 
                 TTC ATT TGG CAC TCG ATG AAG CCG TAT AAC CCC GAC AAG ACG ATC GT 
               
               
                   
                 ( Bacillus   
                 T GTCACC AAG GCC GAA GGA TCA TGG ATT ACA ACG AGT GAT GGA AAG AA 
               
               
                   
                 
                   methanolicus 
                 
                 G TAT CTT GAC GCA ATG GCC GGT CTT TGG TGC GTT AAC GTG GGG TAT G 
               
               
                   
                 PB1) 
                 GA CGC AAAGAG CTT GCC GAT GCC GCG TAC GAA CAG ATG ATG GAA ATG G 
               
               
                   
                 [003] 
                 CA TAC TAT CCA CTG ACT CAG TCA CAT GTA CCC GCC ATT CAG TTA GCG 
               
               
                   
                   
                 GAG AAG TTG AACGAT CTG CTG GAA GAC GAA TAC GTA ATC TTT TTT AGC 
               
               
                   
                   
                 AAT TCG GGG AGT GAG GCG AAC GAG GCT GCT TTT AAA ATT GCT CGT CAG 
               
               
                   
                   
                 TAT CAT CAA CAA AAAGGA GAC CAC AAT CGC TAT AAG ATT GTT GCA CGC 
               
               
                   
                   
                 TAC CGT GCA TAT CAT GGG AAC TCA ATT GGA GCC TTG GCA GCG ACA GG 
               
               
                   
                   
                 G CAG GCC CAG CGT AAA TATAAG TAT GAG CCT CTG GCC TTT GGA TTC GT 
               
               
                   
                   
                 C CAT GTT GCC CCT CCT GAC TCC TAC CGT GAT GAA ACT AAC GTA TCC G 
               
               
                   
                   
                 AT CCT TCG CAG TTG TCC GCA GTCAAA GAA ATT GAC CGT GTA ATG ACG T 
               
               
                   
                   
                 GG GAG CTT TCG GAA ACT ATC GCC GCA ATG ATC ATG GAA CCG ATT ATT 
               
               
                   
                   
                 ACT GGT GGA GGC ATC TTA GTG CCC CCAGAG GGG TAT ATG AAA GCG GCT 
               
               
                   
                   
                 AAG GAG GTT TGT GAA AAG CAC GGG GCT CTT TTG ATT GTG GAC GAG GTG 
               
               
                   
                   
                 ATT TGC GGG TTT GGT CGT ACG GGT AAG CCGTTC GGA TTC ATG AAC TAT 
               
               
                   
                   
                 GGA GTC AAG CCG GAC ATT ATC ACC ATG GCT AAA GGC ATC ACC AGT GC 
               
               
                   
                   
                 G TAT CTT CCG TTG TCA GCA ACT GCA GTC AAA AAGGAA ATC TAT GAT GC 
               
               
                   
                   
                 C TTT AAA GGT GAG GAC GAA TAT GAG TTC TTC CGT CAT GTC AAC ACT T 
               
               
                   
                   
                 TC GGA GGG TCA CCC GCC GCA TGT GCG CTG GCT ATC AAGAAC ATT CAG A 
               
               
                   
                   
                 TT TTG GAG GAG GAA AAG CTG TTT GAC CGC TCG GGC GAC ATG GGC GAA 
               
               
                   
                   
                 AAA GTT TTA ACA GAA CTT CAG AAC TTG TTA CGC GAT CAC CCCTAC GTT 
               
               
                   
                   
                 GGC GAC GTT CGT GGA AAG GGT CTG TTA ATC GGA ATT GAA TTG GTT AAA 
               
               
                   
                   
                 GAC AAG CAG ACG AAA GAG CCC TTA AAT ACA AGC AAA GTT GAC GAAGTA 
               
               
                   
                   
                 ATC GCT CTT TGT AAA CAG GAA GGA CTT CTG ATT GGA AAA AAT GGC AT 
               
               
                   
                   
                 G ACC GTG GCA GGC TAT AAC AAC GTC CTT ACA CTG TCC CCT CCG CTT A 
               
               
                   
                   
                 ATATC CCA GAG ACC GAC TTA GAC TTT TTG ATC AAA GTA CTG ACG GCG T 
               
               
                   
                   
                 CC TTG GAG AAG ATT AAG 
               
               
                   
               
               
                  23 
                 [004] lysine 
                 ATG AAA AAT ATC GTA GTG ATC GGG GCA GGG AAT ATT GGC AGC GCC ATT 
               
               
                   
                 dehydrogenase 
                 GCG TGG ATG TTG GCA GCT AGC GGG GAT TAT CGC ATT ACT GTA GCA GA 
               
               
                   
                 ( Agrobacterium   
                 C CGCAGC GCG GAT CAG TTA GCT AAT GTA CCG GCT CAT GAA CGT GTC GA 
               
               
                   
                   tumefaciens ) 
                 C ATT GTT GAC ATT ACC GAC CGC CCC GCG CTG GAA GCA CTG TTA AAA G 
               
               
                   
                   
                 GG AAA TTTGCG GTA CTT AGC GCC GCT CCC ACC GAG TTT CAT TTG ACT G 
               
               
                   
                   
                 CC GGA ATT GCG GAA GCG GCC GTC GCG GTA GGC ACG CAC TAC TTA GAC 
               
               
                   
                   
                 TTA ACA GAA GATGTG GAG TCT ACC CGC AAG GTA AAA GCG CTG GCT GAG 
               
               
                   
                   
                 ACG GCC GAG ACA GCT TTA ATC CCC CAA TGT GGG CTG GCA CCA GGT TTT 
               
               
                   
                   
                 ATT TCG ATT GTT GCTGCC GAT TTG GCT GTG AAG TTT GAT AAA TTA GAT 
               
               
                   
                   
                 TCT GTT CGT ATG CGC GTC GGG GCG CTG CCT CAG TAT CCC AGT AAC GC 
               
               
                   
                   
                 A TTG AAT TAC AAT TTG ACTTGG AGC ACA GAT GGC CTT ATC AAC GAG TA 
               
               
                   
                   
                 C ATT GAG CCT TGC GAG GGG TTT GTA GAA GGT CGC TTG ACC GCG GTC C 
               
               
                   
                   
                 CG GCT TTA GAG GAA CGC GAG GAATTT AGT CTT GAT GGG ATC ACC TAC G 
               
               
                   
                   
                 AG GCA TTC AAC ACC TCG GGC GGA CTT GGG ACC TTG TGC GCC ACC CTT 
               
               
                   
                   
                 GAG GGT AAG GTG CGC ACA ATG AAC TACCGT ACC ATC CGC TAT CCG GGT 
               
               
                   
                   
                 CAT GTA GCA ATC ATG AAG GCA CTT CTT AAT GAC TTG AAC CTG CGT AAT 
               
               
                   
                   
                 CGC CGT GAC GTT TTG AAA GAT CTT TTT GAAAAT GCA CTG CCT GGA ACG 
               
               
                   
                   
                 ATG CAA GAT GTC GTA ATT GTT TTT GTA ACA GTG TGT GGC ACT CGC AA 
               
               
                   
                   
                 C GGA CGC TTT CTG CAA GAG ACT TAT GCC AAT AAAGTG TAC GCG GGG CC 
               
               
                   
                   
                 T GTG TCA GGC CGC ATG ATG TCC GCG ATC CAG ATC ACA ACA GCT GCT G 
               
               
                   
                   
                 GA ATT TGC ACA GTC CTG GAT TTG TTG GCC GAA GGC GCGCTT CCG CAG A 
               
               
                   
                   
                 AG GGC TTC GTT CGT CAA GAG GAG GTC GCA CTG CCT AAG TTT TTG GAA 
               
               
                   
                   
                 AAT CGT TTC GGA CGT TAT TAT GGT TCT CAC GAA CCG CTT GCTCGT GTT 
               
               
                   
                   
                 GGT 
               
               
                   
               
               
                  24 
                 lysine 
                 ATG GCA CAT ACA GGC CGT ATG TTT AAG ATC GAA GCC GCG GAG ATC GTA 
               
               
                   
                 racemase 
                 GTG GCT CGC CTG CCG CTG AAA TTT CGT TTT GAG ACA TCT TTC GGT GT 
               
               
                   
                 (uncultured 
                 C CAGACA CAT AAA GTG GTG CCT TTA CTG ATC TTA CAT GGC GAA GGT GT 
               
               
                   
                 bacterium) 
                 T CAA GGG GTC GCG GAG GGG ACA ATG GAA GCT CGC CCC ATG TAC CGC G 
               
               
                   
                 [005] 
                 AA GAA ACGATT GCC GGA GCC CTT GAT TTG TTG CGT GGA ACT TTT TTA C 
               
               
                   
                   
                 CT GCG ATT CTG GGC CAA ACC TTT GCC AAT CCA GAA GCG GTA AGT GAT 
               
               
                   
                   
                 GCC CTG GGC TCTTAC CGC GGC AAT CGC ATG GCA CGC GCT ATG GTG GAG 
               
               
                   
                   
                 ATG GCA GCT TGG GAC TTG TGG GCC CGC ACC CTT GGT GTG CCT TTG GGC 
               
               
                   
                   
                 ACA CTG TTG GGT GGTCAC AAG GAA CAA GTC GAG GTG GGT GTA TCG TTG 
               
               
                   
                   
                 GGA ATC CAG GCA GAT GAG CAA GCT ACA GTA GAC TTA GTG CGT CGT CA 
               
               
                   
                   
                 T GTT GAA CAA GGA TAT CGTCGC ATT AAG TTG AAG ATT AAG CCT GGG TG 
               
               
                   
                   
                 G GAC GTT CAA CCT GTA CGT GCG ACC CGT GAG GCA TTC ATG TTA AAC A 
               
               
                   
                   
                 CG CTT AAT GTC GGC GCC TCT GGTTAC GCG GGC GCA GAA CTG GTT ACA T 
               
               
                   
                   
                 AC GTG AAC CGC CAC CCC CAT ATG AAC ATT ACG GCG TTG ACC GTA TCA 
               
               
                   
                   
                 GCA CAG TCA AAC GAT GCA GGG AAG TTAATC TCC GAT TTG CAT CCC CAA 
               
               
                   
                   
                 TTA AAG GGC ATC GTT GAC TTA CCA TTG CAG CCG ATG TCC GAC ATC TCT 
               
               
                   
                   
                 GAA TTC AGC CCC GGG GTA GAT GTA GTG TTCCTG GCT ACA GCT CAC GAA 
               
               
                   
                   
                 GTT TCA CAC GAC CTG GCC CCG CAA TTT TTG GAG GCG GGT TGT GTG GT 
               
               
                   
                   
                 C TTT GAT CTG TCC GGC GCT TTT CGC GTT AAC GATGCT ACA TTT TAC GA 
               
               
                   
                   
                 G AAG TAT TAC GGT TTC ACC CAC CAA TAC CCA GAG CTG CTG GAA CAG G 
               
               
                   
                   
                 CG GCC TAC GGG CTT GCT GAG TGG TGT GGC AAC AAA CTTAAG GAA GCT A 
               
               
                   
                   
                 AT CTT ATT GCA GTT CCT GGA TGT TAC CCT ACC GCC GCA CAG CTG GCG 
               
               
                   
                   
                 CTG AAG CCG TTA ATT GAT GCT GAC CTG CTG GAC CTG AAC CAATGG CCG 
               
               
                   
                   
                 GTG ATC AAT GCG ACC AGT GGC GTA TCT GGG GCG GGT CGT AAA GCC GCA 
               
               
                   
                   
                 ATT TCA AAC TCC TTC TGC GAG GTT AGC TTA CAA CCG 
               
               
                   
               
               
                  25 
                 Lysine 
                 ATG GAG CAG ACG AAG AAA TGG GGA TTT TGG TTA CTG ACG GCC TTC GTC 
               
               
                   
                 transporter 
                 GTG GGC AAC ATG GTG GGT AGT GGA ATC TTT TCT CTT CCA TCC TCC CT 
               
               
                   
                 yvsh 
                 G GCGAGC ATC GCG TCG CCT TTC GGA GCT ACG TCC GCT TGG CTT CTG AC 
               
               
                   
                 ( Bacillus   
                 A GGT GCG GGG GTG TTA ATG ATC GCC TTA GTA TTC GGA CAT TTG TCC A 
               
               
                   
                   subtilis ) 
                 TT CGT AAACCC GAA TTG ACT GCC GGG CCT CAA TCA TAC GCC CGT GCA T 
               
               
                   
                 [006] 
                 TG TTC AGC GAT CCA AAA AAG GGG AAT GCG GCC GGG TTT ACT ATG GTT 
               
               
                   
                   
                 TGG GGT TAC TGGGTC GCG AGC TGG ATC AGT AAC GTA GCA ATC ATT ACA 
               
               
                   
                   
                 TCT CTG GCG GGG TAT CTG ACC AGC TTC TTC CCC ATC CTG GTA GAC AAA 
               
               
                   
                   
                 CGC GAA ATG TTT TCTATT GGG GGT CAA GAG GTC ACC CTG GGG CAG CTG 
               
               
                   
                   
                 CTG ACT TTT GCC GTT TGC ACC ATT CTG TTG TGG GGC ACC CAT GCG AT 
               
               
                   
                   
                 T TTG GTC GCA TCG ATC AATGGC GCA AGC AAG CTG AAT TTT GTG ACC AC 
               
               
                   
                   
                 A TTA TCC AAG GTC TTG GGA TTC GTG TTT TTC ATT GTG GCA GGG TTA T 
               
               
                   
                   
                 TC GTC TTC CAG ACG ACG CTT TTTGGT CAT TTC TAT TTC CCG GTC CAA G 
               
               
                   
                   
                 GC GAG AAT GGA ACG AGC ATC GGT ATT GGG GGA CAG GTG CAT AAC GCT 
               
               
                   
                   
                 GCG ATT TCT ACA CTT TGG GCT TTC GTCGGA ATC GAA AGC GCC GTT ATC 
               
               
                   
                   
                 TTG TCT GGC CGC GCG CGC AGC CAG CGC GAT GTT AAA CGT GCT ACC ATT 
               
               
                   
                   
                 ACC GGA CTT CTG ATT GCA CTG TCG ATC TATATT ATC GTC ACG TTA ATC 
               
               
                   
                   
                 ACG ATG GGT GTT TTA CCC CAC GAC AAA TTA GTA GGA AGT GAA AAG CC 
               
               
                   
                   
                 A TTT GTC GAT GTT TTA TAT GCA ATC GTC GGG AACGCT GGT TCA GTA AT 
               
               
                   
                   
                 C ATG GCA CTG CTG GCC ATC TTG TGC CTT TTT GGA ACC ATG TTG GGG T 
               
               
                   
                   
                 GG ATT TTA CTG GGC TCG GAG GTG CCC TAC CAA GCA GCCAAA GCT GGT G 
               
               
                   
                   
                 AT TTC CCC GCC TTC TTT GCC AAA ACT AAT AAG AAA GGT TCT CCA GTG 
               
               
                   
                   
                 ATT GCG CTT ATC ATT ACC AAT GTC ATG TCA CAG GTT TTC ATTTTT AGC 
               
               
                   
                   
                 GTG ATC AGT CGT ACA ATT TCC GAT GCT TTT ACT TTT TTG ACT ACA GCG 
               
               
                   
                   
                 GCC ACG TTG GCC TAT CTG ATT CCC TAC TTA GTT TCA GCG ATT TATAGT 
               
               
                   
                   
                 TTG AAA GTG GTT ATT AAA GGC GAA ACC TAT GAC CAG TTG AAA GGC AG 
               
               
                   
                   
                 T CGT GTA CGT GAT GGT CTT ATC GCT ATC TTG GCA TGT GCA TAC TCA G 
               
               
                   
                   
                 TCTTC GTA ATC GTG ACG GGT ACC GCC GAT TTG ACG ACC TTT ATT TTA G 
               
               
                   
                   
                 GT ATT GGG CTT TTT TTT GTG GGC CTT ATC GTG TAC CCA TTT GTC TCG 
               
               
                   
                   
                 AAG AAGTTT CAA AAG GAG AAG CAG GAA 
               
               
                   
               
               
                  26 
                 Lysine 
                 ATG ACC ATG ATT GCT ATT GGC GGG TCG ATC GGC ACA GGG CTT TTC GTT 
               
               
                   
                 Transporter 
                 GCA TCC GGA GCA ACG ATT AGT CAA GCA GGT CCA GGC GGG GCT CTG CT 
               
               
                   
                 LysP 
                 G TCTTAT ATT CTT ATC GGC TTA ATG GTG TAT TTT CTG ATG ACC TCT CT 
               
               
                   
                 ( Klebsiella ) 
                 T GGA GAG CTG GCC GCT TTT ATG CCA GTC TCC GGA TCG TTC GCT ACA T 
               
               
                   
                 [007] 
                 AT GGG CAAAAC TAC GTA GAG GAG GGT TTC GGG TTT GCG CTG GGT TGG A 
               
               
                   
                   
                 AT TAC TGG TAT AAT TGG GCT GTG ACG ATC GCA GTT GAC TTG GTG GCT 
               
               
                   
                   
                 TCG CAG CTT GTGATG AGC TAT TGG TTC CCT GAC ACT CCG GGC TGG ATT 
               
               
                   
                   
                 TGG TCT GCT TTG TTT TTG GGC ATC ATG TTC TTG CTT AAC TGG ATC TCC 
               
               
                   
                   
                 GTT CGC GGG TTC GGTGAA GCT GAG TAC TGG TTC AGT CTG ATT AAA GTT 
               
               
                   
                   
                 GCG ACC GTT ATT ATC TTC ATC ATC GTT GGC GTG ATG ATG ATT GTC GG 
               
               
                   
                   
                 C ATT TTC AAA GGG GCG CAACCG GCT GGA TGG TCC AAC TGG GG ATC GC 
               
               
                   
                   
                 T GAC GCC CCA TTT GCG GGG GGC TTC TCG GCG ATG ATT GGC GTT GCC A 
               
               
                   
                   
                 TG ATT GTC GGT TTT TCC TTT CAGGGT ACA GAG TTA ATT GGA ATT GCT G 
               
               
                   
                   
                 CT GGT GAA TCC GAG AAT CCT GAG AAA AAT ATT CCA CGT GCG GTA CGT 
               
               
                   
                   
                 CAG GTA TTC TGG CGC ATT TTA CTG TTTTAT GTT TTT GCA ATC TTG ATT 
               
               
                   
                   
                 ATC TCG TTG ATC ATC CCT TAT ACT GAC CCA TCC TTA TTG CGT AAC GAT 
               
               
                   
                   
                 GTG AAG GAT ATT TCC GTG TCT CCC TTC ACGTTG GTA TTT CAG TAT GCT 
               
               
                   
                   
                 GGG CTG CTT AGT GCC GCT GCG ATC ATG AAC GCA GTC ATT CTT ACG GC 
               
               
                   
                   
                 T GTA CTG AGC GCT GGA AAC TCG GGA ATG TAC GCTTCA ACA CGC ATG TT 
               
               
                   
                   
                 A TAT ACC TTG GCA TGT GAC GGG AAA GCA CCG CGT ATC TTT AGC AAG C 
               
               
                   
                   
                 TT TCC CGT GGC GGT GTG CCA CGC AAT GCT CTG TAT GCAACA ACT GTA A 
               
               
                   
                   
                 TT GCT GCC TTA TGC TTT CTT ACC AGC ATG TTC GGC AAC CAA ACG GTT 
               
               
                   
                   
                 TAT CTG TGG TTG CTG AAC ACT TCG GGA ATG ACA GGG TTC ATCGCC TGG 
               
               
                   
                   
                 CTG GGT ATT GCT ATT TCT CAC TAT CGT TTC CGT CGC GGC TAC GTG CTG 
               
               
                   
                   
                 CAG GGG AAT GAT ATC AAT AAT CTT CCG TAT CGT TCA GGA TTT TTTCCT 
               
               
                   
                   
                 CTT GGA CCC ATT TTT GCA TTT GTA TTG TGT TTG ATT ATT ACT CTT GG 
               
               
                   
                   
                 C CAA AAT TAT GAG GCG TTC TTA AAA GAT ACT ATC GAT TGG GGT GGG G 
               
               
                   
                   
                 TAGCC GCA ACC TAC ATC GGG ATT CCC TTG TTC CTT GTT ATT TGG TTT G 
               
               
                   
                   
                 GA TAT AAG TTG GCT AAG GGT ACC CGC TTT GTC CGT TAT TCC GAA ATG 
               
               
                   
                   
                 ACC TTCCCA GAT CGT TTT AAA CGC 
               
               
                   
               
               
                  27 
                 Lysine 
                 ATG AGT ATG GAA GTC TGG CTG GGG TTT TTT GCA GCG TGT TGG GTG ATT 
               
               
                   
                 Exporter 
                 AGT TTG TCA CCG GGA GCC GGA GCC ATC GCC TCT ATG TCA TCG GGT TT 
               
               
                   
                 ( Pseudomonas ) 
                 A CAATAT GGC TTC TGG CGT GGC TAC TGG AAT GCA CTT GGA TTG CAG CT 
               
               
                   
                   
                 T GGT TTA ATT ATG CAA ATT GCA ATT ATC GCT GCG GGC GTC GGA GCC G 
               
               
                   
                   
                 TC TTG GCGGCC TCG GCT ACG GCC TTC CAG GTA ATT AAA TGG TTC GGA G 
               
               
                   
                   
                 TT GGG TAT CTT GTG TAT TTA GCA TAC AAA CAA TGG CGT GCA CTG CCC 
               
               
                   
                   
                 ATG GAT ATG TCGGAT GAA AGC GGG GTG CGT CCA ATC GGC AAA CCA TTA 
               
               
                   
                   
                 TCG CTG GTA TTT CGT GGA TTT TTG GTG AAT ATC TCC AAC CCA AAA GCT 
               
               
                   
                   
                 TTA GTA TTC ATG TTGGCC GTT TTA CCC CAG TTC CTG AAT CCC CAC GCC 
               
               
                   
                   
                 CCC TTG TTA CCC CAA TAC GTG GCT ATC ACT GTG ACA ATG GTT ACA GT 
               
               
                   
                   
                 T GAC TTG TTA GTG ATG GCCGGA TAC ACA GGT TTA GCA TCT CAT GTA TT 
               
               
                   
                   
                 A CGT ATG CTT CGT ACC CCA AAA CAG CAA AAA CGC CTG AAC CGC ACC T 
               
               
                   
                   
                 TC GCC GGT TTA TTC ATC GGA GCGGCC ACA TTC CTT GCC ACT TTG CGC C 
               
               
                   
                   
                 GC GCA CCA GTA 
               
               
                   
               
               
                  28 
                 Asparaginase 
                 ATG CAG AAG AAA TCG ATC TAC GTC GCG TAC ACG GGC GGC ACC ATT GGG 
               
               
                   
                 ( Escherichia   
                 ATG CAG CGT TCG GAG CAG GGT TAC ATC CCC GTT TCC GGT CAC TTG CA 
               
               
                   
                   coli ) 
                 G CGCCAG CTG GCC TTG ATG CCC GAG TTC CAT CGC CCC GAG ATG CCA GA 
               
               
                   
                   
                 T TTT ACC ATT CAT GAG TAC ACT CCA CTT ATG GAT TCA TCG GAC ATG A 
               
               
                   
                   
                 CG CCG GAAGAC TGG CAA CAC ATT GCA GAA GAT ATC AAG GCT CAC TAT G 
               
               
                   
                   
                 AT GAT TAT GAC GGC TTT GTT ATT TTA CAC GGT ACT GAC ACA ATG GCA 
               
               
                   
                   
                 TAC ACA GCT TCTGCA CTT TCC TTT ATG CTT GAG AAC CTT GGT AAG CCC 
               
               
                   
                   
                 GTG ATC GTG ACC GGG TCG CAG ATC CCC CTT GCC GAA TTG CGC AGT GAC 
               
               
                   
                   
                 GGG CAG ATC AAT CTTCTT AAT GCG TTA TAT GTG GCC GCT AAC TAT CCG 
               
               
                   
                   
                 ATC AAT GAA GTG ACT TTA TTC TTC AAT AAC CGC TTG TAC CGT GGA AA 
               
               
                   
                   
                 C CGC ACT ACG AAA GCC CATGCT GAT GGC TTT GAC GCC TTT GCA TCC CC 
               
               
                   
                   
                 A AAT CTG CCT CCC CTT TTG GAA GCC GGG ATT CAC ATC CGT CGT TTA A 
               
               
                   
                   
                 AT ACA CCC CCC GCC CCA CAT GGAGAG GGG GAG CTT ATC GTA CAT CCA A 
               
               
                   
                   
                 TT ACC CCT CAA CCT ATC GGA GTT GTA ACG ATT TAC CCT GGT ATT AGT 
               
               
                   
                   
                 GCC GAC GTA GTC CGC AAT TTC CTT CGCCAG CCC GTG AAA GCA TTG ATC 
               
               
                   
                   
                 TTA CGT TCC TAC GGT GTA GGG AAC GCG CCA CAG AAT AAG GCA TTT CTG 
               
               
                   
                   
                 CAA GAA TTA CAA GAG GCA TCG GAT CGT GGTATC GTG GTA GTC AAC CTG 
               
               
                   
                   
                 ACA CAG TGC ATG TCA GGT AAA GTT AAT ATG GGT GGA TAC GCA ACC GG 
               
               
                   
                   
                 G AAT GCA TTA GCT CAT GCA GGG GTA ATT GGA GGCGCT GAT ATG ACG GT 
               
               
                   
                   
                 C GAA GCT ACC CTG ACG AAG CTT CAT TAT CTG TTA TCC CAG GAG TTG G 
               
               
                   
                   
                 AC ACC GAG ACC ATT CGC AAA GCT ATG TCT CAG AAC CTTCGC GGT GAG C 
               
               
                   
                   
                 TT ACT CCC GAT GAC 
               
               
                   
               
               
                  29 
                 Asparagine 
                 ATG CCG CCT CTG GAC ATC ACC GAC GAA CGC TTG ACT CGC GAA GAT ACA 
               
               
                   
                 transporter 
                 GGA TAT CAC AAA GGC CTT CAC TCC CGT CAG CTT CAG ATG ATC GCT CT 
               
               
                   
                 ansp2 
                 T GGAGGT GCT ATT GGG ACC GGA CTT TTT CTG GGG GCA GGC GGA CGT CT 
               
               
                   
                 ( Mycobacterium   
                 G GCT TCT GCC GGA CCG GGA TTA TTC TTG GTT TAT GGT ATC TGT GGC A 
               
               
                   
                   bovis ) 
                 TT TTT GTCTTT CTT ATT CTT CGT GCC TTG GGA GAA CTT GTG CTT CAC C 
               
               
                   
                   
                 GC CCT AGT TCA GGA TCA TTT GTA TCC TAC GCG GGG GAA TTT TAT GGT 
               
               
                   
                   
                 GAA AAG GTC GCGTTC GTC GCG GGG TGG ATG TAT TTT TTG AAT TGG GCA 
               
               
                   
                   
                 ATG ACT GGG ATT GTG GAC ACT ACA GCC ATC GCC CAC TAT TGC CAC TAT 
               
               
                   
                   
                 TGG CGC GCT TTT CAACCA ATT CCA CAG TGG ACG TTG GCC CTT ATT GCG 
               
               
                   
                   
                 TTG TTA GTT GTA TTA TCC ATG AAT CTG ATC TCC GTC CGC TTA TTC GG 
               
               
                   
                   
                 G GAA CTT GAG TTT TGG GCCTCG CTT ATT AAA GTA ATT GCG CTT GTT AC 
               
               
                   
                   
                 G TTC CTG ATT GTA GGG ACT GTA TTC CTG GCG GGG CGT TAC AAG ATT G 
               
               
                   
                   
                 AC GGG CAA GAA ACT GGT GTA TCATTA TGG TCA TCT CAT GGC GGA ATC G 
               
               
                   
                   
                 TT CCT ACG GGG TTA CTG CCC ATT GTC CTT GTG ACC TCT GGA GTT GTG 
               
               
                   
                   
                 TTC GCA TAC GCA GCC ATC GAG CTG GTAGGA ATC GCA GCC GGG GAG ACG 
               
               
                   
                   
                 GCC GAA CCA GCC AAA ATC ATG CCC CGC GCA ATC AAT TCG GTC GTC CTT 
               
               
                   
                   
                 CGT ATT GCG TGT TTT TAT GTG GGA TCT ACGGTG CTT CTG GCG TTG CTT 
               
               
                   
                   
                 TTA CCA TAC ACG GCT TAT AAG GAG CAC GTA AGT CCC TTC GTA ACA TT 
               
               
                   
                   
                 T TTC AGC AAA ATT GGA ATT GAT GCC GCG GGG AGTGTA ATG AAC TTG GT 
               
               
                   
                   
                 A GTG CTT ACG GCA GCG TTA TCT AGT TTG AAC GCT GGT TTG TAT TCC A 
               
               
                   
                   
                 CA GGA CGC ATC CTG CGC TCA ATG GCG ATC AAC GGC AGCGGA CCA CGC T 
               
               
                   
                   
                 TT ACG GCA CCC ATG AGT AAA ACC GGT GTT CCT TAT GGC GGT ATC TTG 
               
               
                   
                   
                 CTT ACA GCA GGT ATC GGT TTA TTG GGA ATC ATT CTT AAT GCGATC AAA 
               
               
                   
                   
                 CCC TCG CAG GCG TTC GAA ATC GTT TTA CAC ATC GCT GCT ACC GGC GTA 
               
               
                   
                   
                 ATC GCA GCC TGG GCT ACG ATC GTG GCT TGT CAG TTG CGC TTA CATCGC 
               
               
                   
                   
                 ATG GCC AAC GCT GGC CAA CTT CAG CGC CCT AAG TTC CGT ATG CCC TT 
               
               
                   
                   
                 G TCA CCT TTT AGC GGG TAC CTG ACT TTG GCG TTT CTG GCG GGC GTG C 
               
               
                   
                   
                 TGATT CTG ATG TAT TTC GAT GAG CAG CAC GGG CCC TGG ATG ATC GCC G 
               
               
                   
                   
                 CG ACA GTA ATT GGG GTT CCT GCC CTT ATT GGG GGT TGG TAC TTG GTT 
               
               
                   
                   
                 CGT AACCGT GTG ACT GCC GTC GCT CAT CAC GCT ATT GAC CAC ACT AAG 
               
               
                   
                   
                 AGT GTA GCT GTG GTT CAT TCG GCA GAT CCC ATT 
               
               
                   
               
               
                  30 
                 Serine 
                 ATG TCC ATT AAT CAG GAG GCG CTT CAC GTA CTG TTG AAG GAT CCT TTT 
               
               
                   
                 ammonia 
                 ATT CAT CGT CTT ATT GAT GCT GAG CCA GTG TTT TGG GCA AAT CCA GG 
               
               
                   
                 lyase 
                 T ATGAAG GAG GGG CTG CTT TTT CAC GCT GAC GAG TGG GAA AGT GAG AT 
               
               
                   
                 ( Bacillus   
                 T GCC GAA GCA GAG AAA CGC TTG CGT CGT TTT GCG CCT TAT ATC GCG G 
               
               
                   
                   subtilis ) 
                 AG GTT TTCCCA GAG ACC AAA GAT GCA AAG GGC ATG ATC GAG TCT CCA C 
               
               
                   
                   
                 TG TTT GAG ATG CAA CAT ATG AAA AAG AAA CTG GAG GCA GCA TAC CAA 
               
               
                   
                   
                 CAA CCT TTC CCCGGA CGT TGG CTG CTT AAG TGT GAC CAT GAA CTT CCC 
               
               
                   
                   
                 ATT TCC GGG TCG ATT AAG GCC CGC GGA GGT ATC TAT GAA GTC TTG AAA 
               
               
                   
                   
                 CAT GCC GAA AAG CTGGCT CTT CAG GAG GGG ATG CTT CAA GAG TCG GAC 
               
               
                   
                   
                 GAT TAT CGT ATG TTG CAA GAA GAT CGT TTC GCG GCC TTC TTC AGC CG 
               
               
                   
                   
                 C TAT TCT ATC GCA GTG GGCTCC ACG GGC AAT TTA GGT TTA AGT ATC GG 
               
               
                   
                   
                 G ATT ATT GGC GCT GCT CTT GGT TTC CGC GTA ACA GTT CAC ATG AGT G 
               
               
                   
                   
                 CT GAC GCT AAG CAA TGG AAG AAAGAT CTG TTA CGT CAG AAA GGG GTA A 
               
               
                   
                   
                 CC GTA ATG GAA TAT GAG AGC GAT TAT TCA GAA GCA GTT AAA GAA GGT 
               
               
                   
                   
                 CGT CGC CAA GCA GAA CAA GAC CCA TTCTGT TAC TTC ATT GAT GAT GAA 
               
               
                   
                   
                 CAT AGC CGT CAA TTG TTC CTG GGC TAC GCA GTT GCC GCG TCC CGC CTT 
               
               
                   
                   
                 AAG ACA CAA CTG GAT TGC ATG GAA ATC CAACCT GGT CCC GAA ACA CCC 
               
               
                   
                   
                 CTG TTC GTG TAT CTT CCC TGT GGC GTA GGT GGG GGG CCA GGA GGT GT 
               
               
                   
                   
                 C GCT TTC GGG TTG AAA CTG CTG TAT GGA GAT CACGTC CAT GTA TTT TT 
               
               
                   
                   
                 C GGA GAA CCG ACG CAA TCC CCG TGC ATG CTT TTA GGC TTA TAT TCT G 
               
               
                   
                   
                 GC TTA CAC GAG CAG ATT TCA GTT CAA GAC ATT GGA TTGGAC AAC CGT A 
               
               
                   
                   
                 CC GCG GCG GAT GGC TTG GCG GTA GGG CGT CCC TCA GGA TTC GTA GGA 
               
               
                   
                   
                 AAA TTA ATC GAA CCA CTG CTG TCG GGC TGC TAT ACT GTA GAAGAC GAT 
               
               
                   
                   
                 ACA CTG TAT GCT TTA CTG CAC ATG CTG GCA GCT TCG GAA TCC AAG TAT 
               
               
                   
                   
                 CTT GAA CCT AGC GCC TTG GCG GGG ATG TTC GGC CCG ATC CAG CTGTTC 
               
               
                   
                   
                 AGC ACA GAA GAA GGA CGT CGC TAT TCT CAG AAA CAT AAA ATG GAG CA 
               
               
                   
                   
                 T GCG GTG CAC GTT ATC TGG GGG ACG GGG GGT AGC ATG GTG CCA AAG G 
               
               
                   
                   
                 AGGAG ATG GCC GCA TAC AAC CGC ATC GGG GCG GAT CTG TTA AAA AAT G 
               
               
                   
                   
                 AA ATG AAG AAG 
               
               
                   
               
               
                  31 
                 SdaA 
                 ATG TCC CTT TCA GTG TTT GAT CTT TTT AAG ATC GGA ATT GGT CCC TCG 
               
               
                   
                 ( Pseudomonas   
                 TCC TCT CAT ACC GTA GGA CCT ATG CGT GCG GCC GCT CGT TTT GCC GA 
               
               
                   
                 
                   fluorescens 
                 
                 A GGTCTG CGC CGC GAC GAC CTG CTG AAC TGT ACT ACT AGC GTG AAA GT 
               
               
                   
                 F113) 
                 C GAG CTG TAC GGA TCT CTG GGC GCG ACT GGT AAA GGG CAC GGT TCG G 
               
               
                   
                   
                 AC AAA GCAGTG TTA CTG GGA TTG GAG GGA GAA CAC CCT GAC ACT GTC G 
               
               
                   
                   
                 AC ACC GAG ACG GTT GAC GCT CGT TTA CAG GCG ATC CGC AGT TCA GGC 
               
               
                   
                   
                 CGC CTG AAT TTATTG GGG GAG CAT AGC ATT GAG TTT AAT GAA AAG CTG 
               
               
                   
                   
                 CAC TTG GCA ATG ATT CGC AAG CCG TTA GCT TTC CAT CCG AAT GGC ATG 
               
               
                   
                   
                 ATT TTC CGT GCG TTTGAT GCT GCG GGC TTA CAG GTA CGT TCC CGT GAG 
               
               
                   
                   
                 TAT TAC TCC GTC GGC GGA GGG TTC GTT GTA GAC GAG GAC GCA GCG GG 
               
               
                   
                   
                 T GCC GAC CGT ATC GTC GAGGAT GCA ACA CCT TTG ACA TTC CCC TTC AA 
               
               
                   
                   
                 G AGC GCG AAG GAT CTT TTA GGT CAT TGT TCT ACT TAT GGT TTA AGC A 
               
               
                   
                   
                 TC AGC CAA GTC ATG CTT ACA AACGAG TCT GCG TGG CGT CCG GAA GCG G 
               
               
                   
                   
                 AG ACC CGC GCA GGG CTT CTT AAA ATT TGG CAG GTG ATG CAA GAC TGC 
               
               
                   
                   
                 GTT GCC GCG GGG TGT CGC AAT GAG GGCATC CTT CCA GGA GGT CTT AAA 
               
               
                   
                   
                 GTA AAG CGC CGC GCG GCT GCG TTG CAT CGT CAA TTG TGT AAG AAC CCC 
               
               
                   
                   
                 GAG GCT GCC CTG CGC GAT CCG TTA AGT GTATTA GAT TGG GTG AAT TTG 
               
               
                   
                   
                 TAT GCG TTA GCG GTA AAT GAA GAG AAC GCC TAC GGT GGA CGC GTG GT 
               
               
                   
                   
                 C ACG GCG CCC ACT AAT GGA GCC GCA GGA ATC ATTCCT GCC GTA TTG CA 
               
               
                   
                   
                 T TAC TAC ATG CGC TTT ATT CCG GGG GCA TCT GAG GAC GGA GTA GTC C 
               
               
                   
                   
                 GC TTC CTT CTT ACA GCG GCG GCA ATC GGG ATC TTG TATAAA GAG AAC G 
               
               
                   
                   
                 CC TCT ATT AGT GGG GCT GAG GTT GGC TGT CAG GGC GAA GTA GGA GTG 
               
               
                   
                   
                 GCA TGC TCC ATG GCA GCG GGG GCG TTG TGC GAA GTC TTG GGAGGC TCG 
               
               
                   
                   
                 GTC CAA CAA GTA GAA AAC GCA GCA GAA ATC GGA ATG GAG CAT AAC CTT 
               
               
                   
                   
                 GGC TTG ACA TGT GAT CCT ATC GGC GGG TTA GTA CAG GTC CCG TGTATC 
               
               
                   
                   
                 GAG CGT AAC GCA ATG GGA TCT GTT AAA GCC ATT AAC GCA GTA CGC AT 
               
               
                   
                   
                 G GCT ATG CGC GGG GAC GGT CAC CAT TTC GTC TCC CTT GAC AAA GTA A 
               
               
                   
                   
                 TTCGT ACC ATG CGT CAA ACT GGG GCC GAC ATG AAA AGC AAG TAC AAG G 
               
               
                   
                   
                 AA ACC GCG CGT GGT GGA CTT GCT GTC AAC ATC ATC GAG TGT 
               
               
                   
               
               
                  32 
                 sdaB 
                 ATG ATT AGT GTG TTT GAC ATC TTT AAA ATC GGT ATC GGT CCG TCT TCT 
               
               
                   
                 ( Klebsiella   
                 TCC CAT ACG GTT GGT CCC ATG AAA GCA GGG AAG CAG TTT ACC GAC GA 
               
               
                   
                   pneumoniae ) 
                 C TTAATT GCT CGT GGA CTG CTG GCA GAG GTC AGT AAG GTC GTG GTT GA 
               
               
                   
                   
                 T GTT TAT GGC TCC CTT TCA TTG ACG GGC AAA GGT CAC CAT ACT GAC A 
               
               
                   
                   
                 TT GCT ATCATT ATG GGT CTG GCG GGA AAC TTG CCA GAC ACC GTT GAC A 
               
               
                   
                   
                 TC GAC GCC ATC CCC GGC TTC ATC CAA GAT GTT AAC ACT CAC GGA CGT 
               
               
                   
                   
                 CTG ATG TTA GCGAAT GGG CAG CAT GAA GTT GAT TTC CCG GTA GAC CAG 
               
               
                   
                   
                 TGT ATG AAT TTT CAC GCT GAC AAC CTG TCC TTG CAC GAG AAT GGA ATG 
               
               
                   
                   
                 CGT ATT ACG GCT CTTGCG GGA GAC AAA GTG TTG TAC TCT CAG ACT TAC 
               
               
                   
                   
                 TAC TCA ATC GGC GGC GGA TTC ATT GTT GAT GAG GAA CAT TTT GGC CA 
               
               
                   
                   
                 A ACA ACG GAG GCT CCT GTAGCC GTC CCA TAT CCA TAC AAA AAC GCC GC 
               
               
                   
                   
                 T GAT TTG CAG CGT CAT TGC CGT GAA ACT GGT TTG AGT TTA TCT GGA C 
               
               
                   
                   
                 TT ATG ATG CAA AAC GAA CTT GCATTG CAT AGC AAA GAA GCT CTG GAA C 
               
               
                   
                   
                 AG CAC TTT GCT GCA GTT TGG GAG GTT ATG TCT GCC GGC ATT GAG CGC 
               
               
                   
                   
                 GGC ATT ACA ACT GAA GGT GTG TTG CCTGGC AAA TTA CGT GTA CCC CGC 
               
               
                   
                   
                 CGC GCC GCG GCA CTG CGT CGT ATG TTA GTC TCG CAA GAC ACG ACG AAC 
               
               
                   
                   
                 TCG GAC CCT ATG GCT GTT GTA GAT TGG ATCAAT ATG TTC GCG TTG GCC 
               
               
                   
                   
                 GTC AAC GAG GAG AAC GCG GCG GGC GGT CGC GTT GTT ACA GCC CCC AC 
               
               
                   
                   
                 A AAT GGC GCG TGC GGA ATT GTT CCG GCC GTG CTGGCA TAT TAT GAC AA 
               
               
                   
                   
                 A TTT ATC CGC AAA GTC AAC TCC AAC AGT CTG GCG CGT TAT ATG CTG G 
               
               
                   
                   
                 TG GCA AGT GCA ATC GGC TCA CTT TAT AAG ATG AAT GCGAGC ATC TCC G 
               
               
                   
                   
                 GC GCA GAA GTT GGC TGC CAA GGT GAA GTG GGG GTC GCC TGC TCT ATG 
               
               
                   
                   
                 GCA GCG GCT GGC TTG GCA GAG CTG TTG GGC GGG TCG CCA GGGCAA GTG 
               
               
                   
                   
                 TGC ATT GCG GCT GAA ATT GCG ATG GAG CAT AAC TTG GGC CTT ACG TGC 
               
               
                   
                   
                 GAT CCC GTA GCT GGC CAA GTG CAG GTA CCG TGT ATC GAA CGC AATGCA 
               
               
                   
                   
                 ATT GCA GCC GTA AAA GCA GTA AAT GCG GCT CGC ATG GCC TTA CGT CG 
               
               
                   
                   
                 T ACT TCC GAG CCC CGT GTG TGC TTG GAT AAG GTG ATC GAA ACC ATG T 
               
               
                   
                   
                 ATGAG ACA GGT AAG GAC ATG AAT GCA AAG TAT CGT GAA ACG TCT CGT G 
               
               
                   
                   
                 GA GGC CTG GCC ATG AAG ATC GTC GCG TGT GAC 
               
               
                   
               
               
                  33 
                 tdcG L- 
                 ATG ATT AGT GCA TTC GAT ATT TTC AAG ATT GGA ATC GGC CCC TCG TCA 
               
               
                   
                 serine 
                 TCG CAC ACG GTG GGC CCA ATG AAC GCA GGT AAG TCC TTC ATT GAT CG 
               
               
                   
                 dehydratase 
                 C CTTGAG TCG AGT GGC TTA TTG ACA GCG ACA AGC CAC ATT GTC GTG GA 
               
               
                   
                 ( Escherichia   
                 C CTG TAC GGG AGT CTG TCG TTG ACG GGC AAA GGC CAT GCG ACC GAT G 
               
               
                   
                   coli  O157:H7 
                 TT GCT ATTATC ATG GGA TTG GCC GGG AAT TCA CCG CAG GAC GTA GTA A 
               
               
                   
                 str. SS17) 
                 TC GAT GAA ATC CCG GCC TTC ATT GAG CTG GTA ACT CGT TCG GGC CGT 
               
               
                   
                   
                 CTG CCA GTC GCAAGC GGA GCT CAT ATC GTT GAC TTC CCA GTT GCC AAG 
               
               
                   
                   
                 AAC ATT ATT TTT CAC CCT GAA ATG TTA CCT CGC CAT GAG AAC GGA ATG 
               
               
                   
                   
                 CGT ATC ACA GCA TGGAAA GCT CAG GAA GAA TTA TTG AGT AAG ACG TAT 
               
               
                   
                   
                 TAC TCG GTT GGT GGC GGG TTC ATC GTC GAG GAA GAG CAC TTC GGT TT 
               
               
                   
                   
                 A TCT CAT GAC GTA GAA ACACCA GTA CCA TAC GAC TTC CAT TCA GCA GG 
               
               
                   
                   
                 T GAG TTG TTG AAA ATG TGC GAT TAC AAT GGC CTT AGT ATT TCG GGA C 
               
               
                   
                   
                 TT ATG ATG CAT AAC GAA TTA GCGCTT CGT TCG AAG GCC GAA ATT GAC G 
               
               
                   
                   
                 CC GGC TTC GCA CGT ATC TGG CAA GTT ATG CAT GAT GGC ATC GAA CGT 
               
               
                   
                   
                 GGT ATG AAC ACC GAA GGT GTG TTA CCAGGA CCC TTG AAT GTT CCG CGT 
               
               
                   
                   
                 CGT GCA GTC GCA CTG CGT CGT CAA CTT GTT AGT AGT GAC AAC ATT TCC 
               
               
                   
                   
                 AAT GAT CCA ATG AAC GTG ATT GAC TGG ATCAAC ATG TAC GCG CTG GCG 
               
               
                   
                   
                 GTC TCG GAG GAA AAC GCC GCT GGG GGT CGC GTG GTA ACA GCA CCT AC 
               
               
                   
                   
                 G AAT GGG GCT TGC GGG ATC ATC CCT GCG GTA TTGGCC TAT TAC GAT AA 
               
               
                   
                   
                 G TTT CGC CGT CCA GTC AAT GAG CGC TCA ATC GCT CGT TAC TTC CTG G 
               
               
                   
                   
                 CG GCG GGG GCT ATC GGC GCT TTA TAC AAG ATG AAC GCCTCT ATT TCA G 
               
               
                   
                   
                 GG GCG GAG GTC GGT TGT CAA GGA GAG ATT GGG GTC GCG TGC TCT ATG 
               
               
                   
                   
                 GCA GCT GCA GGT TTG ACA GAA TTA TTA GGC GGC AGC CCA GCCCAA GTT 
               
               
                   
                   
                 TGC AAC GCG GCT GAA ATC GCA ATG GAA CAT AAT CTT GGT CTG ACC TGT 
               
               
                   
                   
                 GAC CCT GTC GCA GGT CAG GTA CAG ATT CCT TGC ATT GAG CGT AATGCA 
               
               
                   
                   
                 ATC AAC GCA GTA AAA GCT GTT AAT GCG GCG CGT ATG GCT ATG CGT CG 
               
               
                   
                   
                 C ACA TCA GCC CCG CGT GTG AGC CTG GAT AAG GTA ATC GAG ACC ATG T 
               
               
                   
                   
                 ACGAA ACC GGT AAA GAC ATG AAT GAC AAA TAC CGC GAA ACC TCT CGC G 
               
               
                   
                   
                 GG GGT CTT GCA ATT AAA GTC GTG TGT GGC 
               
               
                   
               
               
                  34 
                 glyA 
                 ATG TTG AAA CGT GAG ATG AAT ATT GCC GAC TAT GAT GCA GAA TTA TGG 
               
               
                   
                 ( Escherichia   
                 CAA GCT ATG GAA CAA GAG AAA GTC CGC CAG GAA GAA CAT ATT GAA TT 
               
               
                   
                   coli  EPEC 
                 A ATCGCC TCT GAA AAT TAC ACT AGT CCC CGC GTT ATG CAA GCC CAA GG 
               
               
                   
                 C342-62) 
                 C AGC CAA TTA ACT AAC AAA TAT GCC GAG GGA TAT CCT GGG AAA CGC T 
               
               
                   
                   
                 AC TAT GGAGGT TGC GAG TAT GTA GAT ATT GTC GAA CAG TTA GCA ATC G 
               
               
                   
                   
                 AC CGC GCG AAA GAG CTT TTC GGC GCA GAC TAT GCA AAC GTG CAG CCC 
               
               
                   
                   
                 CAT TCG GGT AGCCAA GCG AAT TTT GCG GTC TAT ACC GCA CTG CTG GAA 
               
               
                   
                   
                 CCG GGA GAC ACG GTA CTG GGT ATG AAT TTA GCT CAT GGT GGT CAC TTA 
               
               
                   
                   
                 ACG CAC GGG TCC CCCGTT AAT TTC TCT GGA AAA CTG TAC AAC ATC GTC 
               
               
                   
                   
                 CCC TAT GGA ATC GAT GCT ACC GGC CAC ATT GAT TAC GCG GAT CTT GA 
               
               
                   
                   
                 G AAG CAA GCT AAG GAA CATAAA CCA AAG ATG ATC ATT GGC GGT TTT TC 
               
               
                   
                   
                 A GCT TAT AGT GGT GTC GTC GAC TGG GCT AAG ATG CGT GAA ATT GCA G 
               
               
                   
                   
                 AC TCT ATT GGC GCG TAC CTT TTTGTC GAC ATG GCC CAC GTG GCT GGC T 
               
               
                   
                   
                 TG GTG GCG GCA GGG GTC TAC CCG AAC CCC GTT CCC CAT GCG CAT GTC 
               
               
                   
                   
                 GTG ACC ACC ACG ACA CAT AAG ACA CTGGCT GGG CCT CGT GGT GGC TTA 
               
               
                   
                   
                 ATC TTG GCC AAG GGG GGG TCT GAG GAA TTA TAC AAA AAA CTT AAC TCA 
               
               
                   
                   
                 GCC GTT TTT CCA GGC GGA CAG GGT GGT CCGTTG ATG CAC GTG ATT GCT 
               
               
                   
                   
                 GGA AAG GCG GTC GCT CTT AAG GAA GCC ATG GAA CCT GAA TTC AAA AC 
               
               
                   
                   
                 G TAC CAA CAG CAG GTT GCA AAA AAC GCC AAA GCGATG GTT GAG GTT TT 
               
               
                   
                   
                 C CTG GAA CGT GGT TAC AAA GTC GTT AGT GGG GGT ACC GAT AAT CAT C 
               
               
                   
                   
                 TT TTC TTA GTT GAC CTG GTA GAT AAA AAT TTG ACC GGAAAG GAG GCG G 
               
               
                   
                   
                 AC GCT GCC TTA GGC CGT GCG AAT ATT ACC GTC AAT AAA AAC TCG GTG 
               
               
                   
                   
                 CCA AAT GAT CCC AAG TCG CCT TTC GTG ACT TCA GGA ATC CGCGTA GGA 
               
               
                   
                   
                 ACT CCC GCA ATT ACA CGC CGC GGG TTC AAG GAA GCT GAG GCG AAG GAG 
               
               
                   
                   
                 TTA GCA GGA TGG ATG TGT GAT GTT TTA GAC TCG ATT AAC GAT GAGGCG 
               
               
                   
                   
                 GTG ATC GAA CGT ATC AAA GGT AAA GTA TTA GAT ATT TGC GCC CGT TA 
               
               
                   
                   
                 T CCA GTT TAT GCC 
               
               
                   
               
               
                  35 
                 SdaC serine 
                 ATG GAG ACC ACG CAG ACT TCT ACA ATT GCG AGC AAA GAT AGC CGT TCT 
               
               
                   
                 STP 
                 GCT TGG CGC AAA ACT GAT ACT ATG TGG ATG TTG GGC CTG TAT GGA ACA 
               
               
                   
                 transporter 
                 GCTATT GGG GCC GGG GTA CTG TTT TTG CCA ATC AAT GCT GGA GTG GGG 
               
               
                   
                 ( Escherichia   
                 GGT ATG ATC CCG CTG ATC ATT ATG GCG ATT CTT GCT TTC CCA ATG ACA 
               
               
                   
                   coli  BL21(DE 
                 TTT TTTGCA CAT CGC GGT CTT ACA CGC TTT GTC CTT TCA GGA AAG AAT 
               
               
                   
                 3) 
                 CCT GGG GAG GAC ATT ACG GAG GTT GTA GAA GAA CAT TTT GGC ATT GGG 
               
               
                   
                   
                 GCT GGG AAACTT ATC ACA TTG CTG TAT TTT TTT GCA ATC TAT CCC ATT 
               
               
                   
                   
                 TTG CTT GTC TAT AGC GTA GCA ATC ACG AAC ACC GTA GAA TCA TTC ATG 
               
               
                   
                   
                 TCG CAC CAG TTAGGC ATG ACA CCT CCG CCA CGT GCG ATT CTG TCA TTG 
               
               
                   
                   
                 ATC TTG ATC GTG GGA ATG ATG ACA ATT GTT CGT TTC GGA GAG CAA ATG 
               
               
                   
                   
                 ATC GTG AAA GCC ATGTCA ATT TTG GTA TTT CCG TTC GTG GGA GTC TTA 
               
               
                   
                   
                 ATG TTG CTG GCA TTG TAT TTA ATT CCC CAG TGG AAT GGT GCC GCT CTG 
               
               
                   
                   
                 GAG ACC TTG TCG TTG GATACG GCG TCA GCG ACC GGT AAT GGT CTT TGG 
               
               
                   
                   
                 ATG ACG CTT TGG TTG GCC ATT CCG GTC ATG GTT TTT TCA TTT AAC CAC 
               
               
                   
                   
                 TCA CCG ATC ATT AGC TCG TTCGCT GTG GCG AAA CGC GAA GAA TAC GGT 
               
               
                   
                   
                 GAT ATG GCT GAA CAA AAG TGC TCG AAG ATT TTG GCA TTC GCC CAC ATC 
               
               
                   
                   
                 ATG ATG GTA CTT ACG GTC ATG TTCTTC GTG TTT TCT TGC GTC CTT AGT 
               
               
                   
                   
                 TTA ACC CCA GCG GAC CTG GCG GCT GCA AAG GAA CAA AAT ATC AGC ATC 
               
               
                   
                   
                 TTA AGC TAT TTG GCG AAT CAT TTC AACGCG CCT GTT ATC GCA TGG ATG 
               
               
                   
                   
                 GCA CCC ATT ATC GCT ATC ATT GCA ATT ACC AAA TCT TTC TTA GGG CAC 
               
               
                   
                   
                 TAC TTG GGT GCG CGC GAA GGA TTT AAC GGGATG GTT ATC AAG TCG CTT 
               
               
                   
                   
                 CGT GGG AAA GGA AAG AGT ATC GAG ATC AAT AAA CTT AAT CGC ATC ACC 
               
               
                   
                   
                 GCC TTG TTC ATG TTA GTA ACA ACG TGG ATC GTCGCT ACA CTT AAT CCC 
               
               
                   
                   
                 TCC ATT CTG GGG ATG ATT GAA ACG CTT GGG GGT CCA ATC ATC GCA ATG 
               
               
                   
                   
                 ATC TTG TTT CTG ATG CCG ATG TAC GCT ATC CAG AAGGTA CCC GCA ATG 
               
               
                   
                   
                 CGT AAA TAC TCT GGG CAT ATC TCC AAC GTG TTT GTT GTT GTT ATG GGA 
               
               
                   
                   
                 TTA ATC GCT ATT TCT GCT ATC TTC TAT AGT CTG TTC TCC 
               
               
                   
               
               
                  36 
                 threonine 
                 ATG GCG TAT TCT GTC CAG TTC CTG ATC CAA CTG TCC TTC TCG TAC CTT 
               
               
                   
                 Serine 
                 GCC ACT GTG GCT TTT GCT ATC TGC ATC AAC GTT CCA CGT CGT GCG TT 
               
               
                   
                 Exporter 
                 A AATTTT GCC GGA TGG GCC GGT GCC ATC GGG TGG ATC TGC TAC TGG CT 
               
               
                   
                 ( Lactobacillus   
                 G CTG AAC ACA CAT GGC ACG GGC CGC ATG TTC GCT AAC CTG ATT GGC G 
               
               
                   
                 
                   saniviri 
                 
                 CT GTC GCAGTT GGG GTA TGT GGT ATC ATT TTC GCT CGC ATC AAG AAG A 
               
               
                   
                 JCM 17471 = 
                 TG CCC GTG ATT ATT TTC AAT ATT CCG GGG CTG GTG CCA TTA GTG CCT 
               
               
                   
                 DSM 24301) 
                 GGA GCA ACC GCCTAC CAG GCA GTT CGC GCT CTT GCG TTG GGA AAT ATG 
               
               
                   
                   
                 GAC CTT GCT ATC CAG CTT GGA GTT CGT GTT ATT ATG GTC GCA GGG GCA 
               
               
                   
                   
                 ATC GCG GTG GGA TTCATG GTT AGT CAG CTT CTG TCA GAG TTG ACT TAC 
               
               
                   
                   
                 CGC TTG CAC 
               
               
                   
               
               
                  37 
                 glutaminase 
                 ATG CTG GAT GCT AAT AAG CTG CAG CAG GCT GTC GAT CAG GCT TAT ACT 
               
               
                   
                 YbaS 
                 CAA TTT CAT TCT TTG AAT GGT GGG CAG AAT GCC GAT TAC ATT CCT TT 
               
               
                   
                 ( Escherichia   
                 C TTGGCT AAT GTC CCA GGG CAA TTA GCA GCC GTA GCT ATT GTA ACA TC 
               
               
                   
                   coli  ST131) 
                 C GAT GGC AAC GTG TAT TCT GCC GGG GAC TCG GAC TAC CGC TTC GCA C 
               
               
                   
                   
                 TT GAG TCTATC AGT AAA GTC TGC ACT TTG GCA CTG GCG CTG GAG GAC G 
               
               
                   
                   
                 TT GGG CCT CAG GCC GTG CAG GAC AAG GTT GGG GCT GAT CCT ACA GGG 
               
               
                   
                   
                 CTG CCA TTC AACTCA GTA ATT GCT TTG GAA TTA CAC GGT GGA AAA CCA 
               
               
                   
                   
                 CTG TCA CCG CTG GTG AAC GCG GGG GCA ATC GCT ACC ACG TCT TTG ATT 
               
               
                   
                   
                 AAT GCA GAA AAT ACGGAA CAG CGT TGG CAA CGT ATT TTG CAT ATT CAG 
               
               
                   
                   
                 CAG CAG CTT GCT GGT GAG CAA GTC GCA CTT TCT GAT GAA GTG AAC CA 
               
               
                   
                   
                 A AGT GAA CAA ACT ACT AATTTT CAC AAC CGT GCA ATT GCT TGG TTA CT 
               
               
                   
                   
                 G TAC AGT GCT GGC TAC TTG TAC TGT GAC GCA ATG GAA GCC TGT GAT G 
               
               
                   
                   
                 TT TAT ACA CGT CAG TGC AGT ACTTTG ATC AAC ACA ATC GAA TTG GCA A 
               
               
                   
                   
                 CA TTG GGA GCT ACG TTA GCC GCT GGG GGC GTG AAT CCG TTG ACA CAT 
               
               
                   
                   
                 AAA CGC GTT CTG CAA GCG GAC AAT GTGCCC TAT ATT TTG GCT GAA ATG 
               
               
                   
                   
                 ATG ATG GAA GGG CTT TAT GGC CGC TCT GGG GAC TGG GCC TAC CGT GTA 
               
               
                   
                   
                 GGC TTG CCA GGA AAG TCG GGG GTC GGA GGAGGG ATT CTG GCC GTG GTG 
               
               
                   
                   
                 CCC GGC GTA ATG GGA ATT GCC GCG TTT TCG CCT CCC TTA GAC GAA GA 
               
               
                   
                   
                 A GGT AAC AGC GTG CGC GGA CAA AAG ATG GTT GCGAGC GTT GCA AAG CA 
               
               
                   
                   
                 G CTT GGG TAT AAC GTA TTT AAA GGG 
               
               
                   
               
               
                  38 
                 Glutaminase 
                 ATG GCC GTC GCA ATG GAT AAC GCC ATT TTA GAG AAT ATC CTG CGC CAA 
               
               
                   
                 ( Escherichia   
                 GTG CGC CCA TTA ATC GGA CAA GGC AAG GTT GCG GAT TAC ATT CCG GC 
               
               
                   
                 
                   coli 
                 
                 C TTAGCT ACA GTG GAT GGG AGT CGC CTG GGA ATC GCT ATT TGC ACT GT 
               
               
                   
                 O145:H28 
                 T GAC GGC CAA TTG TTT CAG GCA GGC GAC GCA CAA GAG CGC TTC TCC A 
               
               
                   
                 str. 
                 TC CAG AGCATT TCT AAA GTG TTG TCA TTG GTT GTT GCT ATG CGT CAC T 
               
               
                   
                 RM12581) 
                 AC TCT GAG GAG GAA ATT TGG CAG CGC GTG GGG AAG GAC CCG TCC GGC 
               
               
                   
                   
                 AGT CCA TTT AATTCG TTG GTA CAG TTG GAG ATG GAA CAA GGA ATC CCT 
               
               
                   
                   
                 CGT AAT CCC TTC ATC AAT GCA GGT GCT CTT GTA GTC TGC GAC ATG TTA 
               
               
                   
                   
                 CAA GGT CGT TTA TCTGCC CCT CGC CAA CGC ATG TTG GAA GTT GTG CGT 
               
               
                   
                   
                 GGT TTG TCT GGA GTT AGC GAT ATC AGC TAC GAC ACG GTC GTG GCT CG 
               
               
                   
                   
                 C AGT GAA TTT GAA CAC TCAGCA CGC AAT GCA GCG ATT GCG TGG TTA AT 
               
               
                   
                   
                 G AAG TCG TTT GGG AAT TTT CAT CAC GAT GTG ACG ACA GTC CTT CAA A 
               
               
                   
                   
                 AT TAT TTC CAC TAC TGC GCA TTGAAG ATG TCG TGC GTA GAG CTT GCC C 
               
               
                   
                   
                 GT ACG TTC GTC TTT CTT GCG AAC CAG GGC AAG GCC ATC CAT ATC GAC 
               
               
                   
                   
                 GAG CCC GTC GTA ACC CCG ATG CAG GCGCGT CAA ATC AAT GCG CTG ATG 
               
               
                   
                   
                 GCG ACA TCG GGA ATG TAT CAG AAT GCG GGG GAG TTC GCC TGG CGT GTC 
               
               
                   
                   
                 GGA TTA CCA GCT AAA TCC GGT GTA GGC GGTGGA ATC GTT GCC ATT GTG 
               
               
                   
                   
                 CCC CAT GAA ATG GCT ATC GCT GTG TGG TCC CCA GAA TTA GAT GAC GC 
               
               
                   
                   
                 A GGA AAT TCG TTA GCA GGT ATT GCG GTT TTA GAACAA CTT ACG AAA CA 
               
               
                   
                   
                 A TTA GGA CGC TCG GTG TAT 
               
               
                   
               
               
                  39 
                 ylaM 
                 ATG GTG TGT CAG CAT AAT GAT GAA TTA GAG GCT CTT GTC AAG AAG GCA 
               
               
                   
                 ( Bacillus   
                 AAA AAG GTT ACG GAT AAG GGG GAG GTG GCT AGT TAC ATT CCA GCT CT 
               
               
                   
                 
                   subtilis 
                 
                 G GCTAAG GCG GAC AAA CAC GAC TTA AGT GTC GCA ATC TAC TAT AGC AA 
               
               
                   
                 subsp. 
                 T AAT GTG TGC CTG TCC GCA GGG GAC GTT GAA AAG ACG TTC ACT CTG C 
               
               
                   
                 
                   subtilis 
                 
                 AA TCC ATCAGC AAA GTT CTG TCG TTA GCT CTG GTA CTT ATG GAG TAT G 
               
               
                   
                 str. 168) 
                 GG AAG GAT AAG GTA TTC AGT TAT GTT GGG CAG GAA CCT ACA GGT GAT 
               
               
                   
                   
                 CCC TTT AAC AGCATC ATT AAA CTG GAG ACA GTC AAC CCC TCT AAG CCA 
               
               
                   
                   
                 TTA AAT CCG ATG ATC AAT GCG GGC GCG TTA GTA GTG ACC AGT CTT ATC 
               
               
                   
                   
                 CGC GGA CGT ACG GTGAAG GAG CGT CTT GAC TAT CTT CTT AGC TTT ATC 
               
               
                   
                   
                 CGT CGT CTG ACT AAT AAT CAA GAA ATT ACA TAC TGC CGC GAG GTA GC 
               
               
                   
                   
                 G GAA AGC GAA TAT TCT ACTTCA ATG ATT AAC CGT GCG ATG TGC TAT TA 
               
               
                   
                   
                 T ATG AAA CAG TAT GGA ATT TTC GAA GAT GAC GTT GAA GCG GTT ATG G 
               
               
                   
                   
                 AC CTT TAT ACA AAG CAA TGC GCTATT GAA ATG AAC TCA CTT GAT TTG G 
               
               
                   
                   
                 CT AAG ATC GGT TCG GTT TTC GCC TTG AAC GGA CGC CAT CCT GAA ACC 
               
               
                   
                   
                 GGG GAG CAA GTG ATT TCG AAG GAT GTAGCC CGT ATC TGT AAG ACG TTT 
               
               
                   
                   
                 ATG GTG ACG TGT GGA ATG TAT AAT GCC TCT GGT GAA TTT GCG ATC AAA 
               
               
                   
                   
                 GTT GGT ATC CCT GCG AAA TCG GGA GTG TCAGGT GGG ATT ATG GGT ATC 
               
               
                   
                   
                 TCC CCT TAC GAT TTC GGA ATC GGG ATC TTT GGA CCC GCG CTG GAC GA 
               
               
                   
                   
                 G AAG GGG AAT AGT ATT GCT GGT GTG AAG CTT TTAGAA ATC ATG AGC GA 
               
               
                   
                   
                 G ATG TAC CGT CTT AGT ATC TTT 
               
               
                   
               
               
                  40 
                 ybgJ 
                 ATG AAA GAG TTG ATT AAA GAG CAT CAA AAG GAT ATC AAT CCT GCA TTA 
               
               
                   
                 ( Bacillus   
                 CAA CTG CAT GAC TGG GTA GAA TAC TAC CGT CCA TTT GCG GCA AAT GG 
               
               
                   
                   subtilis ) 
                 C CAAAGT GCA AAC TAT ATC CCC GCT TTA GGG AAG GTG AAC GAC AGC CA 
               
               
                   
                   
                 G TTA GGG ATC TGC GTA CTG GAA CCG GAT GGC ACC ATG ATT CAC GCT G 
               
               
                   
                   
                 GG GAT TGGAAT GTG TCC TTT ACC ATG CAG TCG ATT TCA AAA GTA ATT A 
               
               
                   
                   
                 GC TTC ATT GCT GCC TGC ATG TCG CGT GGA ATC CCG TAT GTC TTG GAT 
               
               
                   
                   
                 CGT GTA GAC GTGGAA CCC ACA GGA GAT GCT TTT AAT AGT ATC ATC CGT 
               
               
                   
                   
                 TTA GAG ATC AAC AAA CCA GGA AAG CCT TTC AAT CCT ATG ATT AAT GCC 
               
               
                   
                   
                 GGA GCT TTG ACT ATCGCT AGC ATT CTT CCA GGA GAG TCC GCT TAC GAA 
               
               
                   
                   
                 AAA CTT GAG TTT TTG TAT AGC GTG ATG GAG ACT TTA ATC GGT AAA CG 
               
               
                   
                   
                 C CCC CGT ATT CAC GAA GAAGTA TTC CGT TCT GAA TGG GAG ACC GCT CA 
               
               
                   
                   
                 T CGC AAT CGC GCC TTA GCC TAC TAT CTT AAA GAA ACA AAC TTC TTA G 
               
               
                   
                   
                 AG GCC GAG GTC GAA GAG ACA CTGGAA GTA TAT TTG AAA CAA TGC GCG A 
               
               
                   
                   
                 TG GAA TCG ACC ACG GAA GAC ATC GCC CTG ATC GGG TTG ATC CTG GCC 
               
               
                   
                   
                 CAC GAT GGG TAT CAT CCT ATC CGT CATGAG CAG GTC ATT CCC AAG GAT 
               
               
                   
                   
                 GTT GCC AAG TTG GCT AAA GCG TTA ATG TTG ACC TGT GGC ATG TAT AAC 
               
               
                   
                   
                 GCT TCT GGA AAG TAT GCG GCT TTC GTT GGAGTA CCC GCA AAA TCT GGA 
               
               
                   
                   
                 GTT TCG GGT GGT ATT ATG GCC TTG GTG CCT CCA AGT GCG CGT CGC GA 
               
               
                   
                   
                 A CAG CCG TTC CAG AGC GGG TGC GGT ATC GGG ATTTAT GGA CCT GCA AT 
               
               
                   
                   
                 T GAT GAG TAC GGG AAT AGC CTG ACG GGC GGC ATG CTT TTA AAA CAC A 
               
               
                   
                   
                 TG GCC CAA GAG TGG GAA CTG AGT ATT TTC 
               
               
                   
               
               
                  41 
                 Glutamine 
                 CCATGGCAGAACGTGCAGTGCAGCTGGGCGGTGTAGCTCTGGGGACCACTCAAGTTATCAACA 
               
               
                   
                 permease 
                 GCAAAACCCCGCTGAAAAGTTACCCGCTGGACATCCACAACGTTCAGGATCACCTGAAAGAAC 
               
               
                   
                 glnHPQ 
                 TGGCTGACCGTTACGCAATCGTCGCTAATGACGTACGCAAAGCGATTGGCGAAGCGAAAGATG 
               
               
                   
                 operon 
                 ACGACACCGCAGATATCCTGACCGCCGCGTCTCGCGACCTGGATAAATTCCTGTGGTTTATCG 
               
               
                   
                 ( Escherichia   
                 AGTCTAACATCGAATAAATCCATCGCTGATGGTGCAGAACTTTAGTACCCGATAAAAGCGGCT 
               
               
                   
                   coli ) 
                 TCCTGACAGGAGGCCGTTTTGTTTTGCAGCCCACCTCAACGCACTTATTTAGTGCATCCATCT 
               
               
                   
                 GenBank: 
                 GCTATCTCCAGCTGATTAAGTAAATTTTTTGTATCCACATCATCACACAATCGTTACATAAAG 
               
               
                   
                 X14180.1 
                 ATTGTTTTTTCATCAGGTTTTACGCTAAATAATCACTGTGTTGAGTGCACAATTTTAGCGCAC 
               
               
                   
                   
                 CAGATTGGTGCCCCAGAATGGTGCATCTTCAGGGTATTGCCCTATAAATCGTGCATCACGTTT 
               
               
                   
                   
                 TTGCCGCATCTCGAAAAATCAAGGAGTTGCAAAACTGGCACGATTTTTTCATATATGTGAATG 
               
               
                   
                   
                 TCACGCAGGGGATCGTCCCGTGGATAGAAAAAAGGAAATGCTATGAAGTCTGTATTAAAAGTT 
               
               
                   
                   
                 TCACTGGCTGCACTGACCCTGGCTTTTGCGGTTTCTTCTCATGCCGCGGATAAAAAATTAGTT 
               
               
                   
                   
                 GTCGCGACGGATACCGCCTTCGTTCCGTTTGAATTTAAACAGGGCGATAAATATGTGGGCTTT 
               
               
                   
                   
                 GACGTTGATCTGTGGGCTGCCATCGCTAAAGAGCTGAAGCTGGATTACGAACTGAAGCCGATG 
               
               
                   
                   
                 GATTTCAGTGGGATCATTCCGGCACTGCAAACCAAAAACGTCGATCTGGCGCTGGCGGGCATT 
               
               
                   
                   
                 ACCATCACCGACGAGCGTAAAAAAGCGATCGATTTCTCTGACGGCTACTACAAAAGCGGCCTG 
               
               
                   
                   
                 TTAGTGATGGTGAAAGCTAACAATAACGATGTGAAAAGCGTGAAAGATCTCGACGGGAAAGTG 
               
               
                   
                   
                 GTTGCTGTGAAGAGCGGTACTGGCTCCGTTGATTACGCGAAAGCAAACATCAAAACTAAAGAT 
               
               
                   
                   
                 CTGCGTCAGTTCCCGAACATCGATAACGCCTATATGGAACTGGGCACCAACCGCGCAGACGCC 
               
               
                   
                   
                 GTTCTGCACGATACGCCAAACATTCTGTACTTCATCAAAACCGCCGGTAACGGTCAGTTCAAA 
               
               
                   
                   
                 GCGGTAGGTGACTCTCTGGAAGCGCAGCAATACGGTATTGCGTTCCCGAAAGGTAGCGACGAG 
               
               
                   
                   
                 CTGCGTGACAAAGTCAACGGCGCGTTGAAAACCCTGCGCGAGAACGGAACTTACAACGAAATC 
               
               
                   
                   
                 TACAAAAAATGGTTCGGTACTGAACCGAAATAATAACGCTACACCTGTAAAACGCACTGGCAG 
               
               
                   
                   
                 TTCCCTCTCCCCTATGGGGAGAGGATTAGGGTGAGGGGCGCAAACCCGCTCCGGGGCCATTAA 
               
               
                   
                   
                 TTACCCTGAATTTGATTATTTACACCACGGTAACAGGAACAACATATGCAGTTTGACTGGAGT 
               
               
                   
                   
                 GCCATCTGGCCTGCCATTCCGCTTCTGATTGAAGGTGCCAAAATGACCCTGTGGATTTCGGTC 
               
               
                   
                   
                 CTCGGTCTGGCAGGCGGTCTGGTAATCGGATTGCTGGCAGGTTTTGCACGCACCTTCGGAGGT 
               
               
                   
                   
                 TGGATAGCCAACCACGTCGCGCTGGTCTTTATTGAAGTGATCCGCGGCACACCTATCGTCGTC 
               
               
                   
                   
                 CAGGTGATGTTTATTTATTTCGCCCTGCCGATGGCGTTTAACGACTTACGCATCGACCCATTT 
               
               
                   
                   
                 ACTGCGGCGGTGGTCACCATCATGATCAACTCCGGCGCGTATATTGCGGAAATCACGCGTGGT 
               
               
                   
                   
                 GCGGTGCTGTCTATCCACAAAGGTTTTCGTGAAGCAGGACTGGCGCTCGGTCTTTCACGTTGG 
               
               
                   
                   
                 GAAACCATTCGCTACGTCATTTTACCGCTGGCACTGCGTCGTATGCTGCCGCCGCTGGGTAAC 
               
               
                   
                   
                 CAGTGGATCATCAGCATTAAAGACACCTCGCTGTTTATTGTGATCGGCGTGGCGGAACTGACC 
               
               
                   
                   
                 CGTCAGGGGCAAGAAATTATTGCCGGTAACTTCCGCGCCCTTGAGATCTGGAGCGCCGTGGCG 
               
               
                   
                   
                 GTGTTCTATCTGATTATTACCCTGGTGCTGAGCTTTATTCTGCGTCGTCTGGAAAGAAGGATG 
               
               
                   
                   
                 AAAATCCTGTGATTGAATTTAAAAACGTCTCCAAGCACTTTGGCCCAACCCAGGTGCTGCACA 
               
               
                   
                   
                 ATATCGATTTGAACATTGCCCAGGGCGAAGTCGTGGTGATTATCGGGCCGTCCGGTTCCGGTA 
               
               
                   
                   
                 AATCGACCCTGCTGCGCTGCATCAACAAACTGGAAGAAATCACCTCCGGCGATCTGATTGTCG 
               
               
                   
                   
                 ATGGCCTGAAGGTTAACGATCCGAAAGTTGACGAGCGCCTGATTCGCCAGGAAGCAGGTATGG 
               
               
                   
                   
                 TGTTCCAGCAGTTTTACCTCTTCCCGCATCTGACAGCGCTGGAAAACGTCATGTTTGGCCCGC 
               
               
                   
                   
                 TACGCGTGCGTGGCGCGAACAAAGAAGAGGCGGAAAAACTGGCACGTGAGCTGCTGGCGAAAG 
               
               
                   
                   
                 TCGGTCTGGCAGAACGTGCACATCACTACCCTTCCGAACTTTCTGGTGGTCAACAGCAGCGTG 
               
               
                   
                   
                 TGGCGATTGCCCGCGCGCTGGCGGTGAAGCCGAAAATGATGCTGTTTGATGAACCGACTTCCG 
               
               
                   
                   
                 CTCTTGACCCGGAACTGCGCCATGAAGTGCTGAAGGTTATGCAGGATCTGGCTGAAGAAGGGA 
               
               
                   
                   
                 TGACGATGGTGATCGTGACCCACGAAATCGGTTTTGCCGAGAAAGTAGCTTCGCGGCTGATCT 
               
               
                   
                   
                 TTATCGACAAAGGCCGGATTGCGGAAGATGGCAATCCGCAGGTGTTGATCAAGAACCCGCCGA 
               
               
                   
                   
                 GCCAGCGCTTGCAGGAATTTTTGCAGCACGTCTCTTAATAAGACACATTGCCTGATCGTACGC 
               
               
                   
                   
                 TTATCAGGCCTACAGGATATCTGGCAACTTATTAAAATTGCATGAACTTGTAGGACGGATAAG 
               
               
                   
                   
                 GCGTTCACGCGCATCCGGCAAAAAAGCCCGCACGTTGTCAGCAACCTGCTTAATATCCCTTCC 
               
               
                   
                   
                 TCCCTTTCACCCGAAAGGGAGGCACACCAGATTCCTCTCATTTAAAATCGCCCCTCCTCCAGC 
               
               
                   
                   
                 ATCTATACTTATCTTTTTGCTCTATTTTCTCACTGGAGGAGTCATGCGGTGGATCCTGTTCAT 
               
               
                   
                   
                 CCTCTTCTGCCTGCTGGGCGCACCTGCCCACGCGGTATCCATACCCGGCGTTACAACCACAAC 
               
               
                   
                   
                 GACAACGGACTCAACGACTGAACCGGCCCCGGAACCGGATATCGAACAAAAAAAAGCGGCCTA 
               
               
                   
                   
                 TGCGCACTGGCGGATGTGCTGGATAATGACACCTCGCGTAAAGAGTTGATCGACCAGTTGCGC 
               
               
                   
                   
                 ACCGTTGCCGCTACGCCCCTGCTGAACCGGTACC 
               
               
                   
               
               
                  42 
                 Glutamine 
                 ATG AAA AGT GTA CTT AAA GTG TCA TTG GCA GCA CTG ACA CTT GCA TTT 
               
               
                   
                 permease H 
                 GCA GTC TCC AGT CAT GCT GCG GAC AAA AAG TTA GTC GTA GCG ACT GA 
               
               
                   
                 glnH 
                 C ACTGCG TTT GTT CCT TTC GAA TTC AAG CAG GGG GAC AAG TAC GTC GG 
               
               
                   
                 ( Escherichia   
                 C TTT GAC GTA GAC CTT TGG GCC GCC ATT GCA AAA GAG CTT AAG TTG G 
               
               
                   
                   coli  EPEC 
                 AT TAC GAGTTA AAG CCT ATG GAC TTC AGT GGT ATC ATT CCC GCC CTG C 
               
               
                   
                 C342-62) 
                 AA ACG AAA AAC GTG GAT CTT GCG CTT GCA GGC ATT ACT ATT ACC GAC 
               
               
                   
                   
                 GAA CGC AAG AAGGCG ATT GAC TTC AGC GAC GGC TAT TAT AAG TCG GGT 
               
               
                   
                   
                 CTT TTA GTT ATG GTA AAA GCC AAC AAT AAT GAT GTG AAA AGC GTG AAA 
               
               
                   
                   
                 GAT TTG GAC GGG AAAGTA GTG GCA GTT AAA TCA GGT ACA GGG AGT GTG 
               
               
                   
                   
                 GAT TAC GCG AAA GCT AAT ATC AAA ACC AAA GAC TTA CGT CAA TTC CC 
               
               
                   
                   
                 G AAT ATC GAC AAT GCG TATATG GAA CTG GGG ACG AAC CGT GCG GAT GC 
               
               
                   
                   
                 G GTG CTG CAC GAT ACA CCC AAC ATC CTT TAT TTC ATT AAA ACA GCT G 
               
               
                   
                   
                 GT AAT GGT CAA TTT AAA GCT GTAGGC GAC AGC CTG GAA GCC CAG CAA T 
               
               
                   
                   
                 AC GGG ATC GCG TTC CCT AAG GGC TCT GAT GAG CTT CGT GAC AAG GTA 
               
               
                   
                   
                 AAC GGG GCG CTT AAA ACG CTG CGT GAAAAC GGA ACG TAC AAT GAA ATC 
               
               
                   
                   
                 TAT AAG AAG TGG TTC GGA ACC GAG CCC AAA 
               
               
                   
               
               
                  43 
                 Glutamine 
                 ATG CAA TTC GAT TGG AGT GCG ATT TGG CCT GCC ATT CCC CTT CTG ATT 
               
               
                   
                 permease P 
                 GAG GGT GCA AAA ATG ACT CTG TGG ATT TCA GTG CTG GGG TTA GCC GG 
               
               
                   
                 glnP 
                 A GGTCTT GTT ATT GGG TTA TTA GCA GGG TTT GCA CGC ACT TTC GGG GG 
               
               
                   
                 ( Escherichia   
                 A TGG ATT GCA AAT CAT GTT GCG CTG GTC TTC ATC GAA GTC ATT CGT G 
               
               
                   
                   coli  B354) 
                 GC ACC CCCATC GTG GTC CAA GTG ATG TTT ATT TAC TTC GCG TTG CCA A 
               
               
                   
                   
                 TG GCA TTT AAC GAT CTT CGT ATT GAT CCA TTT ACT GCG GCA GTG GTG 
               
               
                   
                   
                 ACT ATC ATG ATTAAT AGT GGG GCG TAC ATT GCG GAG ATT ACT CGC GGC 
               
               
                   
                   
                 GCT GTT CTT TCC ATT CAC AAA GGT TTT CGT GAG GCC GGT TTA GCT CTT 
               
               
                   
                   
                 GGG CTT TCC CGC TGGGAA ACA ATT CGT TAT GTT ATC TTG CCG CTT GCC 
               
               
                   
                   
                 TTG CGC CGT ATG TTG CCG CCG CTG GGT AAC CAA TGG ATC ATT TCT AT 
               
               
                   
                   
                 C AAA GAT ACT TCG CTT TTCATT GTT ATT GGA GTG GCT GAA TTA ACA CG 
               
               
                   
                   
                 C CAA GGT CAA GAA ATC ATC GCG GGG AAT TTC CGT GCA TTA GAG ATC T 
               
               
                   
                   
                 GG AGT GCT GTC GCC GTT TTC TACTTG ATC ATT ACG CTG GTG CTG TCC T 
               
               
                   
                   
                 TT ATT TTG CGC CGC TTG GAG CGT CGC ATG AAG ATT CTT 
               
               
                   
               
               
                  44 
                 Glutamine 
                 ATG ATT GAA TTT AAG AAT GTG TCG AAG CAT TTC GGC CCC ACC CAA GTA 
               
               
                   
                 Permease Q 
                 CTT CAC AAC ATT GAC CTT AAC ATC GCC CAG GGC GAG GTT GTA GTA AT 
               
               
                   
                 glnQ 
                 C ATCGGT CCA TCT GGT AGT GGC AAG TCC ACC TTG CTG CGT TGT ATC AA 
               
               
                   
                 ( Escherichia   
                 T AAA CTT GAG GAA ATC ACC AGC GGA GAC TTA ATT GTG GAC GGT CTT A 
               
               
                   
                   coli  EPEC 
                 AA GTC AACGAT CCA AAA GTG GAC GAA CGC TTG ATT CGT CAG GAA GCG G 
               
               
                   
                 C342-62) 
                 GT ATG GTT TTC CAG CAG TTC TAC TTG TTT CCG CAC CTT ACG GCT CTT 
               
               
                   
                   
                 GAG AAC GTC ATGTTC GGA CCG TTA CGC GTG CGC GGG GCC AAT AAG GAG 
               
               
                   
                   
                 GAG GCG GAG AAG TTG GCA CGC GAG CTG TTA GCA AAA GTT GGC TTG GCT 
               
               
                   
                   
                 GAA CGT GCA CAT CATTAC CCT TCT GAG CTG TCA GGT GGG CAA CAG CAA 
               
               
                   
                   
                 CGT GTC GCC ATC GCA CGC GCG CTT GCT GTA AAA CCA AAG ATG ATG CT 
               
               
                   
                   
                 G TTC GAT GAG CCA ACG TCGGCG CTT GAC CCG GAG TTG CGC CAT GAG GT 
               
               
                   
                   
                 C CTT AAG GTT ATG CAA GAC TTA GCT GAA GAG GGA ATG ACG ATG GTA A 
               
               
                   
                   
                 TC GTG ACG CAC GAG ATT GGA TTCGCA GAG AAG GTA GCA TCT CGT TTG A 
               
               
                   
                   
                 TC TTC ATC GAC AAA GGT CGC ATT GCA GAA GAC GGC GAC CCA CAA GTT 
               
               
                   
                   
                 CTG ATT AAG AAC CCC CCT TCA CAG CGCCTG CAA GAA TTT CTG CAA CAT 
               
               
                   
                   
                 GTC TCC 
               
               
                   
               
            
           
           
               
            
               
                 Tryptophan 
               
            
           
           
               
               
               
            
               
                  45 
                 tryptophan 
                 ATG AGT TCC GCC ACA AGT CCG GCA CTG GAT TAT GCA TTG CTG TTG TCT 
               
               
                   
                 amino 
                 TCT TCT GCT CGT AAC CGT ATG CCT TCT GCA ATC CGT TCC CTG TTC CC 
               
               
                   
                 transferase 
                 G GCAGAA TTA ATT CCA GGC ATG GTC TCT CTT TTG TCA GGT AAA CCG AA 
               
               
                   
                 (transaminase) 
                 T TCG GAG ACC TTT CCC TTT CAG CGC ATC AGT TTG GAA CTT AAA CCC T 
               
               
                   
                 ( Ustilago   
                 CC ATC CATCTG GAG GGA CAG ACC GAG ACA GTG AGC ATC GAA GGT AGC G 
               
               
                   
                   maydis  521) 
                 AT TTA GAC ATC GCT CTT CAG TAT TCA GCA ACG AGT GGG TTG CCA AAG 
               
               
                   
                   
                 TTG GTA GAC TGGATC ATT AAA TTT CAA TCT CGC GTT CAC GCT CGT AAG 
               
               
                   
                   
                 CAG GTC GAT GAG GGC AAT AAG CCG GGT GAA GTA TGG CGC TGT AGC TTT 
               
               
                   
                   
                 GGC AAC GGA TCT CAAGAC CTG CTG ACC AAG ACA TTT GAG GCT TTA GTT 
               
               
                   
                   
                 GAC GCC GGT GAT TCA GTA GTC CTG GAA AGT CCG GCT TAC AGT GGA AT 
               
               
                   
                   
                 T TTG CCG TCG TTG GTT GCGCAT AAA GCC AAC CTT TTC GAG GCA GAA AC 
               
               
                   
                   
                 T GAC GCC GAG GGC GTT GAG CCC ACG GCT TTA GAC ACA TTG CTG ACT A 
               
               
                   
                   
                 AC TGG AAG ACT GAC AGT GCA ACACGT GAC TCT CGT TTT CCC AAG TTT T 
               
               
                   
                   
                 TA TAT ACT ACC CCG ACT GGT GCA AAT CCG TCC GGG ACA TCA GCC TCT 
               
               
                   
                   
                 GAT AAT CGC AAG CGT GCG ATC CTT GATATT ATC CGC AAG CAC AAT TTA 
               
               
                   
                   
                 CTT CTG CTG GAG GAT GAT CCT TAC TAT TTT TTG TCA TTC CAA GGG TTG 
               
               
                   
                   
                 GAA CCG GGG GCT GAC GCG GTC AAA CGC ACTCGT GGG AAG AGC TAT TTT 
               
               
                   
                   
                 CAG TTG GAA GCT CAG GAC GAC TAT GGC GTC GGC CGT GTT GTT CGC TT 
               
               
                   
                   
                 T GAT TCA TTT AGT AAG ATC TTG TCT GCC GGA TTACGC CTG GGT TTC GT 
               
               
                   
                   
                 T ACA GGA CCC AAA GAG ATT CTG GAC GCC ATC GAC CTG GAC ACT TCC T 
               
               
                   
                   
                 CC CGC AAT TTG CAG ACA AGT GGC ACT TCC CAG GCA ATCGCC TAT GCT T 
               
               
                   
                   
                 TG TTG TCT AAG TGG GGA ATT GAC GGT TTT TTA CAT CAT GCG GAC AAT 
               
               
                   
                   
                 GTC GCA CGT TTT TAC CAA AAT CGC TTA GAA CGC TTT GAA GCCAGT GCC 
               
               
                   
                   
                 CAG GCA ATC TTA ACC GGA AGC CCT AGC ATC GCC TCG TGG GTT CGT CCT 
               
               
                   
                   
                 TCG GCA GGG ATG TTC CTG TGG ATC AAG TTA AAG TTG CCT CCG TCGCCC 
               
               
                   
                   
                 GAC TCG GCG GAG GGT GAT AGT TTT GAC CTG ATC TCT AAT AAA GCT AA 
               
               
                   
                   
                 G GCA GCT GGG GTA TTG GCT TTA CCC GGT GTG GCC TTC AAA CCA CCG A 
               
               
                   
                   
                 GCAGT TCA AGT ACG GGT GGC AAA CGT AAG ACA TCG GCA TAT GTC CGC A 
               
               
                   
                   
                 CG TCA TTC TCC CAG GTG CCT CTG GAC CAA GTG GAT ACC GCA TTC ACA 
               
               
                   
                   
                 CGC CTGCGT CAG GTG GTA GAG GAG GCC TGG CGT GAG GCT GGA CTT CAA 
               
               
                   
                   
                 ATC CCC GCG 
               
               
                   
               
               
                  46 
                 Mtr 
                 ATG GCT ACC CTT ACT ACT ACT CAA ACT TCC CCA TCG CTT CTT GGA GGA 
               
               
                   
                 tryptophan 
                 GTC GTT ATC ATC GGT GGA ACT ATC ATC GGA GCA GGG ATG TTT TCA CT 
               
               
                   
                 ArAAP 
                 G CCGGTT GTG ATG TCG GGA GCA TGG TTC TTT TGG TCA ATG GCG GCT CT 
               
               
                   
                 transporter 
                 T ATC TTC ACG TGG TTC TGT ATG TTG CAT AGT GGC CTG ATG ATC CTG G 
               
               
                   
                 ( Escherichia   
                 AA GCA AATCTG AAC TAC CGT ATT GGG TCC TCT TTT GAT ACA ATT ACA A 
               
               
                   
                   coli  BL21(DE 
                 AG GAC CTT CTG GGG AAA GGA TGG AAT GTA GTT AAT GGA ATT AGT ATC 
               
               
                   
                 3)) 
                 GCG TTC GTC CTTTAC ATC TTG ACC TAC GCG TAT ATC TCT GCC TCA GGG 
               
               
                   
                   
                 AGC ATC TTG CAT CAC ACT TTT GCC GAG ATG TCA TTG AAC GTG CCC GCA 
               
               
                   
                   
                 CGC GCT GCT GGC TTTGGT TTT GCA CTG CTT GTG GCA TTC GTA GTC TGG 
               
               
                   
                   
                 TTA AGT ACG AAG GCT GTG AGC CGT ATG ACC GCT ATC GTC CTT GGG GC 
               
               
                   
                   
                 T AAA GTA ATT ACC TTC TTTTTA ACA TTC GGC TCG CTG TTA GGA CAC GT 
               
               
                   
                   
                 G CAG CCT GCC ACT TTG TTC AAT GTG GCT GAA TCA AAC GCC TCG TAT G 
               
               
                   
                   
                 CC CCC TAT TTA CTT ATG ACT TTGCCG TTT TGT CTG GCT TCC TTC GGT T 
               
               
                   
                   
                 AT CAC GGA AAC GTG CCA TCA CTG ATG AAA TAT TAT GGT AAG GAT CCT 
               
               
                   
                   
                 AAA ACA ATT GTG AAG TGC TTG GTA TACGGG ACC TTA ATG GCA CTT GCC 
               
               
                   
                   
                 CTT TAC ACG ATC TGG CTT CTT GCA ACG ATG GGC AAT ATT CCT CGC CCT 
               
               
                   
                   
                 GAA TTT ATC GGG ATC GCA GAA AAA GGG GGGAAT ATT GAC GTG CTG GTC 
               
               
                   
                   
                 CAG GCT TTA TCG GGT GTC TTG AAT AGC CGC TCT TTG GAT CTT TTG TT 
               
               
                   
                   
                 A GTT GTC TTT TCC AAT TTT GCC GTG GCA TCG AGTTTC TTA GGT GTG AC 
               
               
                   
                   
                 G CTG GGT CTT TTT GAT TAC CTG GCC GAT CTG TTC GGA TTC GAC GAC A 
               
               
                   
                   
                 GC GCG GTG GGC CGT CTT AAA ACT GCT TTA TTA ACA TTTGCG CCC CCT G 
               
               
                   
                   
                 TA GTG GGA GGT CTT CTG TTT CCT AAC GGA TTC TTA TAC GCC ATC GGC 
               
               
                   
                   
                 TAC GCC GGA TTG GCG GCC ACG ATT TGG GCA GCT ATC GTC CCGGCT TTA 
               
               
                   
                   
                 TTG GCA CGT GCC TCA CGC AAA CGC TTC GGG AGT CCT AAA TTC CGT GTT 
               
               
                   
                   
                 TGG GGC GGG AAG CCT ATG ATT GCC CTT ATT TTA GTG TTT GGA GTCGGT 
               
               
                   
                   
                 AAT GCA CTT GTG CAC ATC TTG TCA TCG TTC AAT CTG CTT CCC GTT TA 
               
               
                   
                   
                 T CAA 
               
               
                   
               
               
                  47 
                 tryptophan 
                 ATG ACC GAC CAA GCT GAA AAG AAG CAT TCG GCA TTC TGG GGA GTA ATG 
               
               
                   
                 permease Tna 
                 GTC ATT GCC GGT ACC GTG ATC GGC GGT GGG ATG TTT GCT TTA CCT GT 
               
               
                   
                 B 
                 G GACTTA GCA GGC GCG TGG TTT TTT TGG GGG GCG TTC ATT CTG ATT AT 
               
               
                   
                 ( Escherichia   
                 T GCT TGG TTT TCC ATG CTG CAT AGT GGC TTG CTG CTT CTT GAA GCG A 
               
               
                   
                   coli  str. K- 
                 AT CTT AACTAT CCG GTG GGG TCA AGT TTC AAT ACC ATT ACA AAG GAC C 
               
               
                   
                 12 substr. 
                 TG ATT GGT AAC ACA TGG AAT ATC ATT TCG GGG ATC ACG GTA GCA TTT 
               
               
                   
                 MC4100) 
                 GTA TTG TAT ATTCTT ACA TAT GCT TAT ATC AGT GCG AAT GGC GCA ATC 
               
               
                   
                   
                 ATT TCC GAG ACG ATC TCC ATG AAC CTG GGG TAT CAC GCG AAT CCC CGT 
               
               
                   
                   
                 ATT GTC GGC ATC TGCACA GCG ATT TTT GTT GCG AGC GTA TTA TGG CTG 
               
               
                   
                   
                 AGT TCG TTG GCA GCT TCG CGT ATT ACT TCC CTT TTC CTT GGT TTG AA 
               
               
                   
                   
                 A ATC ATC AGC TTC GTA ATTGTG TTT GGG AGT TTT TTT TTC CAG GTC GA 
               
               
                   
                   
                 C TAC TCC ATT CTT CGC GAT GCA ACA AGT AGC ACA GCA GGC ACC AGT T 
               
               
                   
                   
                 AC TTC CCA TAT ATC TTT ATG GCCTTA CCG GTT TGT TTA GCG TCT TTT G 
               
               
                   
                   
                 GT TTT CAT GGT AAT ATC CCC TCA TTA ATT ATT TGC TAC GGC AAG CGC 
               
               
                   
                   
                 AAG GAC AAA TTA ATT AAG TCT GTT GTTTTC GGC TCC TTG TTG GCG CTT 
               
               
                   
                   
                 GTA ATC TAT TTA TTT TGG CTT TAT TGT ACG ATG GGG AAC ATC CCT CGC 
               
               
                   
                   
                 GAA TCC TTT AAG GCT ATT ATT TCT TCA GGAGGC AAC GTA GAC AGT TTG 
               
               
                   
                   
                 GTA AAA AGT TTT TTG GGT ACG AAG CAG CAT GGT ATC ATC GAG TTT TG 
               
               
                   
                   
                 T TTA CTT GTT TTC AGT AAT CTT GCC GTT GCT TCCTCA TTC TTT GGC GT 
               
               
                   
                   
                 G ACT CTG GGG CTT TTT GAT TAT CTG GCA GAT TTA TTC AAG ATC GAC A 
               
               
                   
                   
                 AC TCG CAT GGC GGG CGC TTC AAA ACG GTT CTG CTT ACATTT CTT CCT C 
               
               
                   
                   
                 CA GCT TTA CTT TAC CTG ATC TTT CCG AAT GGT TTT ATC TAT GGT ATT 
               
               
                   
                   
                 GGG GGG GCA GGC CTG TGC GCC ACT ATC TGG GCA GTT ATC ATTCCT GCT 
               
               
                   
                   
                 GTA TTG GCT ATC AAG GCA CGC AAA AAG TTT CCC AAC CAG ATG TTC ACC 
               
               
                   
                   
                 GTG TGG GGC GGC AAT TTG ATT CCG GCA ATC GTG ATC TTA TTT GGTATC 
               
               
                   
                   
                 ACG GTT ATT CTT TGC TGG TTC GGC AAT GTG TTT AAC GTC CTG CCT AA 
               
               
                   
                   
                 G TTT GGA 
               
               
                   
               
               
                  48 
                 aroP 
                 ATG GAA GGG CAG CAG CAT GGC GAA CAG CTT AAG CGT GGC CTG AAG AAT 
               
               
                   
                 ( Escherichia   
                 CGT CAT ATC CAG CTT ATC GCA TTA GGC GGA GCT ATT GGG ACC GGC TT 
               
               
                   
                   coli  O104:H4 
                 G TTCTTA GGC TCT GCT TCA GTC ATT CAG TCT GCG GGG CCA GGC ATT AT 
               
               
                   
                 str. C227- 
                 T TTA GGC TAC GCG ATT GCG GGC TTC ATC GCC TTT TTA ATT ATG CGC C 
               
               
                   
                 11) 
                 AG CTT GGCGAG ATG GTG GTG GAG GAA CCC GTG GCA GGC AGT TTC TCT C 
               
               
                   
                   
                 AC TTT GCA TAC AAG TAT TGG GGA AGT TTT GCA GGC TTT GCG AGC GGT 
               
               
                   
                   
                 TGG AAC TAC TGGGTT CTG TAC GTT CTG GTG GCC ATG GCG GAA CTG ACA 
               
               
                   
                   
                 GCA GTC GGT AAA TAT ATT CAA TTC TGG TAC CCT GAA ATT CCC ACT TGG 
               
               
                   
                   
                 GTC TCT GCC GCT GTCTTC TTT GTC GTC ATT AAT GCA ATC AAC TTG ACC 
               
               
                   
                   
                 AAC GTC AAA GTA TTC GGC GAG ATG GAG TTT TGG TTC GCT ATT ATC AA 
               
               
                   
                   
                 A GTC ATT GCT GTT GTG GCCATG ATC ATT TTC GGA GGC TGG CTG CTT TT 
               
               
                   
                   
                 C AGC GGC AAC GGA GGT CCC CAG GCA ACT GTA TCG AAT CTT TGG GAC C 
               
               
                   
                   
                 AG GGT GGT TTC TTG CCA CAT GGGTTC ACG GGG TTA GTT ATG ATG ATG G 
               
               
                   
                   
                 CC ATT ATT ATG TTC TCG TTT GGA GGG CTT GAA TTG GTG GGC ATC ACT 
               
               
                   
                   
                 GCT GCT GAA GCT GAT AAC CCG GAG CAAAGC ATT CCT AAG GCC ACA AAT 
               
               
                   
                   
                 CAA GTG ATC TAT CGC ATC CTT ATC TTT TAC ATT GGA TCG TTG GCA GTA 
               
               
                   
                   
                 TTG CTG AGT TTG ATG CCC TGG ACC CGT GTCACC GCT GAT ACA AGC CCT 
               
               
                   
                   
                 TTT GTT TTG ATT TTT CAT GAA TTA GGG GAT ACT TTT GTG GCA AAT GC 
               
               
                   
                   
                 G TTA AAC ATC GTC GTA TTA ACT GCT GCC TTG TCAGTA TAT AAC TCC TG 
               
               
                   
                   
                 C GTA TAC TGT AAT AGC CGT ATG CTG TTC GGC TTG GCT CAG CAG GGG A 
               
               
                   
                   
                 AC GCT CCG AAA GCA CTG GCC AGT GTC GAC AAG CGT GGAGTA CCT GTG A 
               
               
                   
                   
                 AT ACG ATT TTA GTT TCT GCT CTG GTC ACT GCA CTT TGT GTA TTG ATC 
               
               
                   
                   
                 AAC TAC CTG GCG CCT GAG TCG GCG TTT GGC CTG CTG ATG GCGCTG GTG 
               
               
                   
                   
                 GTT AGC GCA TTG GTC ATC AAT TGG GCG ATG ATC TCC TTG GCA CAC ATG 
               
               
                   
                   
                 AAA TTC CGC CGT GCT AAA CAA GAA CAG GGT GTG GTT ACA CAC TTCCCA 
               
               
                   
                   
                 GCA TTA TTA TAC CCT CTG GGC AAC TGG ATT TGC TTA CTT TTT ATG GC 
               
               
                   
                   
                 A GCG GTT CTG GTC ATC ATG CTG ATG ACG CCT GGT ATG GCT ATT TCT G 
               
               
                   
                   
                 TTTAT CTG ATT CCG GTT TGG TTA ATC GTA TTA GGG ATT GGC TAT TTA T 
               
               
                   
                   
                 TC AAG GAA AAA ACT GCA AAG GCT GTC AAA GCG CAT 
               
               
                   
               
               
                  49 
                 Aromatic 
                 ATG ACC CGC CAG AAG GCG ACT CTG ATC GGT TTG ATT GCT ATC GTA TTA 
               
               
                   
                 amino acid 
                 TGG TCC ACA ATG GTT GGT TTA ATT CGT GGG GTT TCT GAG GGG CTT GG 
               
               
                   
                 exporter Ydd 
                 C CCGGTG GGC GGA GCA GCA GCT ATC TAC TCC CTG AGC GGT CTG TTA TT 
               
               
                   
                 G 
                 G ATC TTT ACA GTT GGG TTT CCG CGT ATC CGT CAA ATC CCC AAG GGA T 
               
               
                   
                 ( Escherichia   
                 AC TTA TTGGCG GGG AGT TTA CTT TTT GTG AGC TAT GAA ATT TGC CTT G 
               
               
                   
                   coli  TW10598) 
                 CC TTG TCT CTG GGC TAC GCA GCG ACA CGC CAT CAA GCA ATT GAG GTA 
               
               
                   
                   
                 GGG ATG GTT AATTAC CTT TGG CCG TCA TTG ACG ATT CTT TTC GCA ATC 
               
               
                   
                   
                 TTA TTT AAC GGT CAG AAG ACT AAT TGG TTG ATT GTA CCG GGT TTA TTA 
               
               
                   
                   
                 TTA GCG TTG GTG GGAGTA TGC TGG GTG TTG GGA GGT GAC AAT GGT CTG 
               
               
                   
                   
                 CAT TAT GAC GAG ATT ATT AAT AAT ATC ACA ACA TCG CCC TTA TCC TA 
               
               
                   
                   
                 C TTT CTG GCT TTC ATT GGTGCC TTT ATC TGG GCC GCC TAT TGC ACC GT 
               
               
                   
                   
                 G ACG AAT AAG TAC GCT CGT GGC TTC AAC GGA ATT ACA GTA TTT GTC T 
               
               
                   
                   
                 TG CTT ACT GGT GCA TCT TTG TGGGTA TAT TAT TTC TTG ACC CCT CAA C 
               
               
                   
                   
                 CA GAG ATG ATC TTC TCC ACC CCG GTT ATG ATC AAA TTA ATT TCA GCA 
               
               
                   
                   
                 GCT TTC ACT TTG GGA TTC GCA TAC GCAGCT TGG AAT GTC GGC ATT CTT 
               
               
                   
                   
                 CAT GGG AAT GTG ACG ATT ATG GCA GTC GGT TCC TAC TTC ACG CCC GTA 
               
               
                   
                   
                 CTT AGT TCC GCT TTA GCA GCG GTA CTG CTGTCG GCG CCT TTG AGT TTT 
               
               
                   
                   
                 AGT TTC TGG CAG GGT GCC CTG ATG GTG TGT GGG GGC TCC CTT TTG TG 
               
               
                   
                   
                 C TGG CTT GCT ACC CGC CGT GGT 
               
               
                   
               
               
                  50 
                 S- 
                 ATG GCA AAG CAC CTT TTC ACG TCG GAA TCT GTA TCT GAA GGG CAT CCC 
               
               
                   
                 adenosylmeth 
                 GAC AAA ATT GCA GAT CAA ATC TCC GAC GCG GTA CTT GAT GCT ATT CT 
               
               
                   
                 ionine 
                 G GAACAA GAT CCC AAA GCC CGC GTC GCT TGC GAA ACT TAT GTC AAG AC 
               
               
                   
                 synthase 
                 A GGC ATG GTG TTA GTC GGC GGC GAG ATC ACT ACC TCT GCG TGG GTG G 
               
               
                   
                 (UniProtKB/ 
                 AT ATC GAGGAA ATC ACG CGC AAT ACG GTG CGT GAG ATT GGC TAT GTA C 
               
               
                   
                 Swiss-Prot: 
                 AC TCG GAC ATG GGG TTC GAC GCC AAC AGT TGT GCG GTT TTA AGT GCC 
               
               
                   
                 P0A817.2) 
                 ATT GGG AAA CAGTCA CCT GAT ATT AAT CAG GGG GTG GAT CGT GCG GAC 
               
               
                   
                   
                 CCT CTT GAA CAA GGT GCT GGT GAC CAA GGT CTG ATG TTC GGT TAT GCT 
               
               
                   
                   
                 ACG AAC GAA ACC GATGTG TTG ATG CCC GCC CCG ATC ACA TAC GCC CAC 
               
               
                   
                   
                 CGT CTG GTC CAA CGC CAG GCG GAG GTC CGT AAA AAC GGC ACG CTT CC 
               
               
                   
                   
                 T TGG CTT CGT CCA GAT GCTAAG TCG CAG GTC ACT TTC CAA TAC GAC GA 
               
               
                   
                   
                 C GGG AAG ATT GTC GGA ATC GAC GCC GTG GTC TTG TCA ACT CAG CAT T 
               
               
                   
                   
                 CA GAG GAG ATC GAT CAA AAG AGCCTT CAG GAA GCC GTC ATG GAA GAG A 
               
               
                   
                   
                 TC ATC AAG CCG ATT CTG CCT GCA GAA TGG TTA ACT TCC GCG ACC AAG 
               
               
                   
                   
                 TTC TTT ATT AAC CCC ACC GGG CGT TTTGTC ATT GGC GGT CCT ATG GGC 
               
               
                   
                   
                 GAC TGT GGG TTG ACC GGC CGT AAA ATT ATT GTC GAC ACT TAT GGC GGA 
               
               
                   
                   
                 ATG GCT CGT CAT GGC GGT GGG GCA TTC AGTGGC AAG GAC CCG TCA AAG 
               
               
                   
                   
                 GTA GAT CGT TCA GCC GCC TAT GCC GCC CGT TAC GTA GCC AAG AAC AT 
               
               
                   
                   
                 T GTT GCT GCA GGA CTT GCT GAC CGC TGT GAA ATCCAA GTG AGC TAC GC 
               
               
                   
                   
                 G ATC GGC GTA GCA GAA CCC ACC TCC ATT ATG GTG GAA ACT TTT GGC A 
               
               
                   
                   
                 CC GAA AAA GTC CCC AGT GAG CAA CTG ACC TTA TTG GTTCGT GAG TTT T 
               
               
                   
                   
                 TT GAT TTG CGC CCT TAC GGA CTT ATC CAA ATG TTA GAC CTT TTG CAC 
               
               
                   
                   
                 CCA ATC TAC AAA GAA ACT GCA GCA TAC GGT CAC TTT GGA CGCGAG CAT 
               
               
                   
                   
                 TTT CCC TGG GAG AAG ACA GAC AAA GCA CAG CTG TTA CGT GAC GCG GCC 
               
               
                   
                   
                 GGA TTG AAA 
               
               
                   
               
               
                  51 
                 adenosylhomo 
                 ATG ACG GCT ACG ACG CCA CGC CTG AAA CAT GAA GTG AAG GAC CTT GCG 
               
               
                   
                 cysteinase 
                 CTT GCG CCT TTA GGT CGT CAG CGT ATT GAG TGG GCG GGG CGC GAA AT 
               
               
                   
                 ( Anabaena   
                 G CCTGTT TTA AAG CAA ATC CGC GAC CGC TTT GAA AAA GAA AAG CCC TT 
               
               
                   
                 
                   cylindrica 
                 
                 C GCG GGC CTG CGT ATC TCG GCT TGT GCG CAT GTT ACA ACA GAG ACG G 
               
               
                   
                 PCC 7122) 
                 CT CAT TTAGCA ATT GCC CTG AAG GCC GGG GGA GCT GAT GCC GTA TTG A 
               
               
                   
                 GenBank: 
                 TC GCA AGC AAC CCA CTG TCT ACG CAG GAT GAC GTA GCA GCC TCG CTT 
               
               
                   
                 AFZ60429.1 
                 GTC GCT GAT CATGAG ATC TCT GTG TTT GCA CAA AAG GGC GAA GAC GCC 
               
               
                   
                   
                 GCG ACG TAC TCG CGT CAC GTC CAA ATT GCG TTG GAC CAC CGC CCC AAT 
               
               
                   
                   
                 ATC ATC GTT GAT GACGGT TCC GAC GTA GTA GCT GAA TTA GTA CAG CAC 
               
               
                   
                   
                 CGT CAG AAT CAG ATC GCG GAT CTT ATT GGA TCC ACT GAA GAA ACT AC 
               
               
                   
                   
                 A ACT GGG ATT GTT CGC CTTCGC GCT ATG TTC AAC GAG GGG GTT TTG AC 
               
               
                   
                   
                 G TTT CCC GCG ATG AAT GTC AAC GAC GCA GAC ACA AAA CAT TTT TTT G 
               
               
                   
                   
                 AC AAC CGC TAC GGT ACA GGA CAATCT ACC TTG GAC GGG ATC ATT CGT G 
               
               
                   
                   
                 CA ACC AAC ATC TTG CTT GCC GGC AAA ACT ATC GTA GTT GTA GGC TAT 
               
               
                   
                   
                 GGC TGG TGC GGA AAG GGG ACC GCA TTACGC GCC CGC GGG ATG GGA GCT 
               
               
                   
                   
                 AAT GTC ATT GTT ACC GAG ATC GAT CAC ATT AAG GCA ATT GAG GCG GTG 
               
               
                   
                   
                 ATG GAT GGG TTT CGC GTT CTG CCC ATG GCTGAA GCC GCA CCG CAT GGT 
               
               
                   
                   
                 GAT ATC TTT ATC ACT GTA ACG GGT AAT AAA CAC GTA GTT CGT GGT GA 
               
               
                   
                   
                 A CAC TTT GAT GTC ATG AAA GAC GGC GCC ATT GTTTGC AAC TCA GGT CA 
               
               
                   
                   
                 C TTC GAT TTG GAG TTG GAT TTA AAA TAT TTA GCA GCA AAT GCC AAG G 
               
               
                   
                   
                 AA ATC AAA GAT GTG CGC CCA TTC ACA CAA GAA TAT AAATTA ACC AAC G 
               
               
                   
                   
                 GC AAA AGC GTA GTG GTA TTA GGA GAG GGG CGT TTG ATT AAT CTT GCA 
               
               
                   
                   
                 GCG GCA GAA GGT CAT CCG TCG GCA GTT ATG GAC ATG TCT TTCGCC AAT 
               
               
                   
                   
                 CAA GCC TTA GCA GTC GAG TAT TTA GTG AAA AAT AAA GGC TCC TTG GCG 
               
               
                   
                   
                 GCT GGA TTA CAT TCG ATC CCC CGC GAG GTT GAT GAG GAA ATC GCTCGT 
               
               
                   
                   
                 TTA AAA TTG CAA GCG ATG GGG ATT TTT ATC GAT TCC CTG ACA GCA GA 
               
               
                   
                   
                 T CAA ATC GAT TAT ATT AAT TCT TGG CAG TCA GGG ACG 
               
               
                   
               
               
                  52 
                 Cystathionine- 
                 ATG GTA ATG TCG TTA TTC CAC AGT GTT AGC GAT TTA ATC GGT CAC ACA 
               
               
                   
                 beta- 
                 CCT TTA TTA CAA TTG CAT AAG CTT GAT ACA GGA CCC TGT AGT TTG TT 
               
               
                   
                 synthase 
                 C TTGAAA CTT GAG AAT CAA AAC CCA GGA GGG TCA ATT AAA GAT CGT GT 
               
               
                   
                 ( Klebsiella   
                 A GCG CTT AGC ATG ATT AAC GAA GCG GAA CGT CAG GGA AAA CTT GCG C 
               
               
                   
                 
                   quasipneumoniae 
                 
                 CA GGA GGAACT ATC ATC GAG GCT ACG GCG GGA AAT ACT GGG TTG GGG C 
               
               
                   
                 subsp. 
                 TT GCT TTG ATC GCA GCC CAG AAA AAC TAC CGT CTT ATC CTT GTA GTT 
               
               
                   
                   Quasipneumoniae ) 
                 CCC GAC AAG ATGTCA CGT GAA AAA ATT TTC CAC TTG CGT GCC TTA GGC 
               
               
                   
                 GenBank: 
                 GCA ACC GTG CTT TTG ACC CGT TCA GAC GTG AAC AAG GGG CAC CCG GCA 
               
               
                   
                 CDQ16225.1 
                 TAT TAT CAG GAC TATGCT CGC CGC TTG GCA GAT GAG ACT CCA GGG GCG 
               
               
                   
                   
                 TTC TAC ATT GAC CAA TTC AAT AAT GAT GCC AAT CCT TTA GCA CAT GC 
               
               
                   
                   
                 A ACA AGC ACG GCC CCT GAGCTG TTC CAA CAA TTA GAA GGG GAC ATC GA 
               
               
                   
                   
                 T GCC ATT GTG GTT GGT GTT GGG TCG GGT GGA ACG TTG GGC GGC TTG C 
               
               
                   
                   
                 AG GCC TGG TTC GCA GAA CAC TCTCCC AAA ACA GAG TTC ATC TTG GCT G 
               
               
                   
                   
                 AT CCA GCT GGG TCG ATT CTT GCC GAC CAG GTA GAC ACA GGC CGC TAC 
               
               
                   
                   
                 GGG GAA ACG GGA AGC TGG CTT GTA GAGGGT ATT GGC GAG GAT TTT ATC 
               
               
                   
                   
                 CCA CCA CTT GCT CGC CTG GAA GGA GTT CAT ACC GCA TAT CGT GTA TCT 
               
               
                   
                   
                 GAT CGC GAA GCC TTT CTT ACA GCC CGT CAACTG CTT CAG GTA GAG GGT 
               
               
                   
                   
                 GTA TTA GCG GGC TCG TCA ACG GGA ACA TTG TTA TCT GCG GCC TTG CG 
               
               
                   
                   
                 C TAT TGC CGT GCC CAG TCT CGC CCA AAG CGT GTGGTT ACC TTC GCA TG 
               
               
                   
                   
                 T GAC TCT GGA AAT AAG TAC TTG AGT AAG ATG TTC AAT GAC GAC TGG A 
               
               
                   
                   
                 TG CGC CAA CAG GGA CTT ATT GCG CGC CCG GAA CAG GGAGAT CTG AGT G 
               
               
                   
                   
                 AT TTC ATC GCC TTA CGT CAC GAC GAG GGG GCC ACG GTC ACC GCC GCG 
               
               
                   
                   
                 CCC GAC GAC ACA CTG GCG GCT GTA TTT ACT CGC ATG CGC TTGTAC GAT 
               
               
                   
                   
                 ATC TCC CAG CTT CCG GTC TTG GAA GAC GGT CGT GTC GTT GGC ATT GTG 
               
               
                   
                   
                 GAC GAA TGG GAT TTA ATT CGC CAT GTA CGT GGC GAC CGT CAA CGCTTT 
               
               
                   
                   
                 TCC CTG CCA GTC AGC GAG GCT ATG TCC CGT CAC GTA GAA ACG TTA GA 
               
               
                   
                   
                 C AAA CGC GCC CCC GAA TCC GAA TTG CAA GCT ATC TTA GAC CGT GGA C 
               
               
                   
                   
                 TGGTA GCA GTC ATT GCA GAC AAT GCG CGC TTT CTG GGA CTG GTT ACA C 
               
               
                   
                   
                 GT TCA GAT GTC TTA ACG GCA TGG CGC AAT CGT GTG GCG CAA 
               
               
                   
               
               
                  53 
                 cystathionine- 
                 ATG TCG TCT ATT CAC ACC CTG TCT GTT CAT AGT GGC ACC TTC ACG GAC 
               
               
                   
                 gamma- 
                 TCA CAT GGC GCG GTG ATG CCC CCA ATC TAT GCC ACC TCC ACG TTC GC 
               
               
                   
                 lyase 
                 G CAACCT GCG CCC GGA CAG CAC ACC GGA TAT GAA TAC TCG CGC AGT GG 
               
               
                   
                 ( Klebsiella   
                 A AAT CCT ACT CGT CAT GCC TTA GAG ACT GCG ATC GCA GAC CTG GAG A 
               
               
                   
                 
                   pneumoniae 
                 
                 AT GGA ACGCGC GGG TAC GCA TTT GCC TCG GGC TTG GCA GCG ATC TCG A 
               
               
                   
                 subsp. 
                 CT GTC CTT GAA TTG TTG GAT AAG GAC AGC CAT TTA GTT GCA GTG GAT 
               
               
                   
                 
                   pneumoniae 
                 
                 GAT GTC TAT GGTGGG ACC TAC CGT TTA CTT GAA AAC GTT CGT CGT CGT 
               
               
                   
                 HS11286) 
                 TCT GCT GGG CTG CAA GTG TCG TGG GTC AAG CCA GAC GAT TTA GCG GGG 
               
               
                   
                 NCBI 
                 ATT GAG GCG GCT ATCCGT CCT GAC ACC CGT ATG ATC TGG GTC GAA ACA 
               
               
                   
                 Reference 
                 CCT ACT AAT CCT TTG CTG AAA TTA GCC GAT TTG AGC GCC ATC GCA GC 
               
               
                   
                 Sequence: 
                 T ATC GCA CGC CGT CAC AATCTT ATT TCA GTT GCG GAT AAC ACG TTC GC 
               
               
                   
                 YP_005228837.1 
                 T TCA CCA GCC ATC CAC CGT CCT CTT GAA CAC GGT TTC GAC ATT GTG G 
               
               
                   
                   
                 TG CAT TCT GCG ACA AAA TAC TTAAAT GGA CAT TCC GAT GTG GTT GCG G 
               
               
                   
                   
                 GG TTA GCT GTC GTC GGA GAT AAC TCC GGC TTA GCC GAG AAA TTA GGT 
               
               
                   
                   
                 TAT TTA CAA AAT GCA GTT GGC GGG GTATTA GAC CCC TTT TCC TCG TTC 
               
               
                   
                   
                 CTT ACA TTG CGC GGC ATC CGC ACT CTG GCA CTG CGT ATG GAA CGT CAT 
               
               
                   
                   
                 AGC GCG AAT GCA CTG CAG TTA GCC GAA TGGTTG GAA CAA CAG CCC GAA 
               
               
                   
                   
                 GTA GAG CGT GTA TGG TTT CCT TGG CTG GCC TCC CAT CCT CAT CAT CA 
               
               
                   
                   
                 A TTG GCA CGT CAG CAG ATG GCA TTA CCT GGC GGGATG ATT AGC GTA GT 
               
               
                   
                   
                 A GTC AAA GGA GAT GAG GGA TAT GCT GAG CGC ATC ATC AGT AAA CTG C 
               
               
                   
                   
                 GT TGG TTC ACT CTT GCC GAG TCT TTA GGC GGC GTC GAGTCG TTA GTT T 
               
               
                   
                   
                 CC CAG CCG TTC TCA ATG ACA CAT GCT TCG ATC CCA CTT GAA AAG CGT 
               
               
                   
                   
                 CTT GCG AAC GGC ATT ACG CCC CAG CTT ATT CGC CTT AGT GTGGGG ATC 
               
               
                   
                   
                 GAA GAC CCA CAT GAT CTT ATC GCG GAT TGG CAA CAA GCC CTG CGT GCC 
               
               
                   
                   
                 GAA 
               
               
                   
               
               
                  54 
                 cysteine 
                 ATG GAG TTA TAC GAG TGC ATC CAG GAC ATC TTC TCG GGG TTG AAA AAC 
               
               
                   
                 dioxygenase 
                 CCT TCC GTG AAA GAT CTG GCA ACA TCC CTG AAA CAA ATC CCG AAT GC 
               
               
                   
                 ( Bacillus   
                 A GCTAAA TTA TCT CAG CCT TAC ATT AAA GAG CCT GAC CAG TAT GCA TA 
               
               
                   
                 
                   subtilis 
                 
                 C GGT CGC AAT GCC ATC TAC CGT AAC AAC GAG TTG GAG ATT ATT GTT A 
               
               
                   
                 subsp. 
                 TC AAC ATTCCT CCC AAC AAA GAG ACA ACC GTA CAC GAT CAC GGA CAA T 
               
               
                   
                 
                   subtilis 
                 
                 CC ATT GGA TGC GCA ATG GTT CTG GAA GGT AAA TTA CTT AAT AGC ATT 
               
               
                   
                 str. BAB-1) 
                 TAT CGT TCT GCTGGT GAG CAC GCC GAG CTG TCC AAC TCT TAC TTT GTT 
               
               
                   
                 GenBank: 
                 CAC GAG GGG GAA TGC CTT ATC TCG ACT AAA GGC TTG ATT CAC AAA ATG 
               
               
                   
                 AGI30235.1 
                 AGC AAC CCC ACA AGCGAG CGC ATG GTA TCG TTG CAT GTT TAT TCG CCA 
               
               
                   
                   
                 CCG CTT GAG GAC ATG ACA GTA TTT GAG GAA CAG AAA GAG GTG TTA AA 
               
               
                   
                   
                 G AAC TCT 
               
               
                   
               
               
                  55 
                 Glutamate 
                 ATG AGC GTT AGT AAA AAA CTG TTC TCT ACG GCT GTG CGT GGT AAG AGC 
               
               
                   
                 Oxaloacetate 
                 TGG TGG TCA CAC GTC GAG ATG GGC CCT CCT GAT GCG ATT TTG GGG GT 
               
               
                   
                 Transaminase 
                 G ACTGAA GCT TTC AAA GCT GAT TCT AAC CCC AAG AAG ATC AAT TTG GG 
               
               
                   
                 ( Caenorhabditis   
                 C GTG GGA GCG TAC CGT GAT GAC CAA GGA AAA CCG TTC GTA CTT CCT A 
               
               
                   
                   elegans ) 
                 GC GTC AAGGAA GCC GAA CGT CAA GTT ATT GCA GCA AAT CTT GAC AAG G 
               
               
                   
                 NCBI 
                 AG TAC GCC GGG ATC GTT GGC CTG CCT GAA TTC ACG AAA CTT AGT GCT 
               
               
                   
                 Reference 
                 CAG TTA GCA TTAGGG GAA AAC AGT GAC GTA ATC AAA AAC AAG CGT ATT 
               
               
                   
                 Sequence: 
                 TTT ACG ACG CAA AGT ATT TCT GGG ACT GGT GCG CTG CGT ATT GGA AGT 
               
               
                   
                 NP_741811.1 
                 GAG TTC CTG AGT AAATAT GCA AAG ACT AAG GTT ATC TAT CAA CCC ACG 
               
               
                   
                   
                 CCT ACA TGG GGA AAC CAC GTG CCT ATC TTC AAG TTC GCG GGC GTG GA 
               
               
                   
                   
                 T GTG AAA CAG TAT CGT TATTAT GAC AAG TCT ACA TGT GGA TTT GAT GA 
               
               
                   
                   
                 G ACG GGG GCA TTG GCT GAT ATT GCG CAA ATC CCC GAA GGT AGC ACT A 
               
               
                   
                   
                 TT TTG CTG CAC GCG TGC GCA CATAAC CCA ACG GGG GTC GAC CCT AGT C 
               
               
                   
                   
                 GT GAC CAA TGG AAA AAG ATT TCA GAT ATT GTT AAG AAA CGC AAT TTG 
               
               
                   
                   
                 TTC GTG TTT TTT GAC ATG GTG AAT GAGTCA GTC CTG AGT CCG TTA CTG 
               
               
                   
                   
                 CCT CGC ACG CTT ATG CGC CTG CTT GTG TTG TTA CTG AAA TCC CGC AGT 
               
               
                   
                   
                 CTT TTC GCC CAC TCA ACA CCC ACC CAT CAGTCG ATG GAA TTA GCT CTT 
               
               
                   
                   
                 TTG CCG GCC TCG TCG CGT ATC CAA CTT TCT ACC TCC AAT GGG TCA GA 
               
               
                   
                   
                 A ATG TCC AGC TCT TGG CTT ATC GTC AGC AGC CCT 
               
               
                   
               
               
                  56 
                 methionine 
                 ATG AAA CGC GAC CAA CAT TTT GAA ACA CGC GCG ATC CAT ACT GGT TAC 
               
               
                   
                 gamma lyase 
                 AAG CCG AAC GAG CAT TTT GAT AGC TTG ACT CCC CCT ATT TAC CAA AC 
               
               
                   
                 ( Bacillus   
                 C AGCACG TTC ACA TTT GCA TCA ATG GAG CAA GGT GGC AAC CGT TTC GC 
               
               
                   
                 
                   halodurans 
                 
                 A GGC GAG GAA GCA GGA TAT GTT TAT TCA CGC CTG GGG AAC CCC ACC G 
               
               
                   
                 C-125) 
                 TG CAA ATTTTG GAA CAA CGC ATT GCT GAG TTG GAG GGT GGG GAG GCA G 
               
               
                   
                 GenBank: 
                 CT CTT GCC TTT GGA TCT GGC ATG GCT GCT GTC AGT GCG ATT TTG GTG 
               
               
                   
                 BAB04518.1 
                 GGG CTT ACG AAGGCC AAC GAC CAC ATC TTA GTG AGC AAT GGA GTG TAT 
               
               
                   
                   
                 GGT TGT ACG TTT GGG TTG TTA ACG ATG TTA AAG GAA AAA TAC AAC ATC 
               
               
                   
                   
                 GAC GCC ACT TTC AGTCCG ATG GAC AGC GTA GAG GAA ATC CTG GCA AAC 
               
               
                   
                   
                 ATC CAG GAT AAT ACC ACG TGC ATT TAT GTG GAA ACA CCT ATC AAC CC 
               
               
                   
                   
                 C ACC ATG CAG TTA ATC GATTTG GAA CTG GTT GTG CGC GTA GCG AAG GA 
               
               
                   
                   
                 A AAG GGT ATT AAG GTA ATC GTT GAT AAC ACG TTT GCC ACA CCA TAC T 
               
               
                   
                   
                 TA CAA CAA CCG ATT GCT CTG GGATGT GAC TTC GTT GTC CAT TCG GCC A 
               
               
                   
                   
                 CG AAA TAC ATC GGG GGT CAT GGG GAC GTG GTC GCC GGA GTG CTG ATT 
               
               
                   
                   
                 GGA GAC AAG GAA ACA ATT CAG TTG ATCCGT AAG ACC ACC CAG AAG GAT 
               
               
                   
                   
                 ATG GGG GGC GTA ATT TCT CCA TTT GAT GCG TGG CTG CTG TTG CGC GGA 
               
               
                   
                   
                 TTG AAA ACA CTT GCA GTA CGT ATG GAT CGCCAT TGC GAG AAT GCT GAA 
               
               
                   
                   
                 AAA TTG GCC GAG AAA CTG AAA GAG CAT CCA AAA GTA AGT ACG GTT CT 
               
               
                   
                   
                 G TAC CCG GGA GAC TTT GAG CAT CCC GAT CAC TCCATC GTC GCC AAA CA 
               
               
                   
                   
                 G ATG AAA AAG GGA GGC GGT TTA TTA AGC TTT GAG ATC AAG GGG ACT G 
               
               
                   
                   
                 AG GCG GAC ATC GCC AAA GTT GTA AAT CAG TTA AAA CTGATT CGT ATT G 
               
               
                   
                   
                 CT GTT AGT TTG GGT GAC GCA GAG ACC TTG ATT CAG CAT CCT GCA ACC 
               
               
                   
                   
                 ATG ACC CAT GCA GTA GTA CCC GAA AAG CGC CGC ACT CAA ATGGGT ATT 
               
               
                   
                   
                 AGT AAA AAG TTG TTA CGC ATG TCG GCC GGG TTA GAG GCC TGG CAA GAT 
               
               
                   
                   
                 GTC TGG GCT GAC TTA GAG CAG GCG TTA AAT CAA CTG 
               
               
                   
               
               
                  57 
                 Methionine 
                 ATG ACC GCG ATT CCG GCC TTG GCA GAC CTG CAG GCT CGT TAT GCC GAC 
               
               
                   
                 aminotrans- 
                 TTA CAA GGG CGT GGT CTG AAG TTA GAT ATG ACG CGC GGT AAA CCG GC 
               
               
                   
                 ferase 
                 G CCAGAG CAG TTG GAT TTA TCG GAC GAT CTT TTC ACT TTA CCA GGT AA 
               
               
                   
                 ( Methylo - 
                 C CGC GAT CAC CGC ACA GAG AGC GGA GAA GAC GCG CGT AAT TAC GGC G 
               
               
                   
                 
                   bacterium 
                 
                 GA GTA CAGGGC CTG GCT GAG GTC CGT GCC TTA TTC GCC CCT GTG CTT G 
               
               
                   
                   aquaticum ) 
                 GT GCG TCA CCC GAT CGC ATT GCC GTA GGT AAT AAC TCA TCG TTG GCA 
               
               
                   
                 GenBank: 
                 TTG ATG CAT GACTGC ATT GCC TAT GCA TTG CTT AAG GGT GTA CCC GGC 
               
               
                   
                 BAQ48233.1 
                 GGC GCT CGT CCT TGG GCA AAG GAA GAG GAG ATT CGT TTT TTA TGC CCA 
               
               
                   
                   
                 GTC CCA GGG TAC GACCGT CAC TTC GCT CTG TGC GAG ACC TAC GGG ATT 
               
               
                   
                   
                 GGA ATG ATT CCA GTC CCT ATG ACC GCT GAC GGG CCT GAT ATG GAA AT 
               
               
                   
                   
                 G GTT GAA CGT GAG GTA CGCGAT CCA CGC GTC AAA GGT ATG TGG GCG GT 
               
               
                   
                   
                 G CCG CAG TAT AGT AAC CCA GGC GGT GAG ACA TAC TCC GAC GCG ACT G 
               
               
                   
                   
                 TT GAG CGC CTG GCT CGT ATG GAAACC GGT GCC CCT GAC TTC CGT CTT T 
               
               
                   
                   
                 TT TGG GAC AAC GCG TAT GCA CTT CAC CAT TTG ACC GAA CGT CGC CCA 
               
               
                   
                   
                 ACC CTT CGT AAT GTG TTA GAT GCC TGTGCG GAA GCC GGG TCA CCG GAT 
               
               
                   
                   
                 CGT GCT ATT GTG TTT GCT AGT ACG TCG AAA GTT ACA CTG GCG GGG GCA 
               
               
                   
                   
                 GGC CTT GCG ATG CTT GCG TCC AGC GAG GGCAAT ATT CGC TGG TAT TTA 
               
               
                   
                   
                 GCT AAC GCC GGC AAA CGC TCA ATT GGT CCA GAT AAG CTT AAC CAG TT 
               
               
                   
                   
                 G CGC CAT GTT CGC TTT CTG CGT GAC CAG GGC GGACTT GAT GCA TTA AT 
               
               
                   
                   
                 G GAC GGC CAC CGC CGT CTT TTA GCT CCT AAG TTC CGC GCT GTA ACG G 
               
               
                   
                   
                 AA ACC CTT GCT CGT CAT CTG GGC GGG ACT GGA GTA GCGCGC TGG AGC G 
               
               
                   
                   
                 AG CCG GAA GGG GGG TAC TTT ATC CTG CTG GAA GTC CCT GAG GGC TGT 
               
               
                   
                   
                 GCG ACA CGC GTA GTT AAG CTT GCT GCT GCT TGC GGA CTG GCTCTG ACG 
               
               
                   
                   
                 CCC GCA GGG GCG ACG CAC CCA TAC GGG CGT GAC CCT CAA GAT AAG CTG 
               
               
                   
                   
                 TTA CGT CTT GCC CCG TCA TAC CCG AAA CCA GCG GAG GTC GAG GCAGCC 
               
               
                   
                   
                 GCT GAG GTA GTC GCT GTG TGC GTT TTA CTT GCG GCA GCT GAA AGC CG 
               
               
                   
                   
                 C GAA GCT GGC GGT TCG GGG CAG GTT GCT GCA 
               
               
                   
               
               
                  58 
                 Aro10p 
                 ATG GCA CCC GTC ACT ATT GAG AAA TTC GTG AAT CAA GAA GAG CGT CAT 
               
               
                   
                 decarboxylase 
                 TTA GTG AGC AAT CGT TCC GCC ACG ATC CCT TTT GGA GAA TAT ATT TT 
               
               
                   
                 ( Saccharomyces   
                 C AAGCGC CTT CTT TCC ATT GAC ACC AAA AGC GTC TTC GGG GTT CCC GG 
               
               
                   
                 
                   cerevisiae 
                 
                 C GAC TTC AAT TTA TCT TTA TTG GAA TAT TTA TAC TCG CCC TCC GTG G 
               
               
                   
                 YJM1615) 
                 AA TCT GCGGGT CTT CGT TGG GTT GGC ACC TGT AAC GAG TTA AAT GCA G 
               
               
                   
                 GenBank: 
                 CC TAC GCT GCA GAT GGA TAT TCC CGC TAC TCT AAT AAA ATT GGA TGC 
               
               
                   
                 AJV21157.1 
                 TTA ATC ACC ACATAC GGC GTA GGA GAA CTG AGT GCG CTT AAT GGA ATC 
               
               
                   
                   
                 GCG GGG TCA TTC GCT GAA AAT GTA AAG GTT CTG CAT ATC GTA GGG GTC 
               
               
                   
                   
                 GCC AAG TCC ATT GATTCC CGT TCG TCT AAC TTC TCG GAT CGT AAC TTA 
               
               
                   
                   
                 CAT CAC TTG GTC CCG CAG TTA CAT GAT TCG AAC TTT AAA GGA CCC AA 
               
               
                   
                   
                 C CAT AAG GTC TAT CAC GACATG GTT AAA GAT CGT GTC GCA TGT TCC GT 
               
               
                   
                   
                 C GCC TAC CTG GAG GAT ATT GAG ACG GCC TGT GAC CAA GTT GAT AAC G 
               
               
                   
                   
                 TG ATC CGT GAC ATT TAT AAG TATTCA AAA CCT GGT TAC ATT TTC GTC C 
               
               
                   
                   
                 CA GCC GAC TTT GCC GAC ATG TCC GTA ACC TGC GAC AAC TTG GTC AAT 
               
               
                   
                   
                 GTA CCG CGT ATC AGC CAA CAA GAT TGTATT GTC TAC CCC AGC GAG AAC 
               
               
                   
                   
                 CAA CTG TCA GAC ATC ATT AAT AAA ATC ACT AGC TGG ATC TAC TCG TCT 
               
               
                   
                   
                 AAG ACT CCA GCA ATC CTT GGA GAC GTC TTAACT GAT CGT TAT GGG GTA 
               
               
                   
                   
                 TCA AAC TTT CTG AAC AAA CTG ATC TGC AAA ACC GGT ATC TGG AAC TT 
               
               
                   
                   
                 C TCC ACC GTG ATG GGA AAA TCA GTC ATT GAC GAGAGT AAC CCA ACT TA 
               
               
                   
                   
                 T ATG GGT CAA TAC AAC GGC AAA GAA GGT CTT AAA CAG GTC TAT GAA C 
               
               
                   
                   
                 AT TTC GAG CTG TGT GAT TTG GTT TTA CAC TTC GGA GTAGAT ATT AAC G 
               
               
                   
                   
                 AG ATC AAT AAT GGT CAC TAC ACG TTC ACT TAC AAG CCA AAT GCG AAA 
               
               
                   
                   
                 ATT ATT CAA TTC CAC CCT AAT TAT ATT CGT TTA GTA GAC ACTCGT CAG 
               
               
                   
                   
                 GGG AAT GAA CAA ATG TTC AAA GGC ATC AAT TTT GCG CCA ATC TTG AAA 
               
               
                   
                   
                 GAG TTG TAT AAG CGT ATC GAC GTC TCT AAA TTA TCG TTG CAA TACGAT 
               
               
                   
                   
                 TCC AAT GTA ACA CAA TAC ACC AAT GAG ACT ATG CGT CTG GAG GAC CC 
               
               
                   
                   
                 A ACG AAT GGT CAA TCG AGC ATC ATT ACC CAA GTA CAC CTG CAA AAG A 
               
               
                   
                   
                 CCATG CCG AAA TTT TTG AAT CCC GGC GAC GTC GTC GTG TGT GAG ACT G 
               
               
                   
                   
                 GT AGT TTC CAA TTC AGT GTA CGC GAC TTC GCA TTC CCC AGT CAG TTG 
               
               
                   
                   
                 AAA TATATC AGC CAG GGT TTC TTT TTA TCC ATT GGT ATG GCC TTG CCT 
               
               
                   
                   
                 GCC GCG TTG GGG GTT GGG ATC GCA ATG CAG GAT CAT TCC AAC GCG CAT 
               
               
                   
                   
                 ATT AAC GGAGGG AAC GTC AAA GAA GAC TAC AAG CCC CGC TTA ATT TTG 
               
               
                   
                   
                 TTT GAA GGT GAC GGC GCC GCG CAG ATG ACC ATC CAG GAG CTT AGC AC 
               
               
                   
                   
                 G ATC CTT AAA TGCAAT ATC CCT TTG GAG GTC ATT ATC TGG AAT AAC AA 
               
               
                   
                   
                 T GGA TAC ACT ATC GAG CGT GCC ATC ATG GGT CCA ACA CGT TCA TAT A 
               
               
                   
                   
                 AC GAT GTG ATG TCG TGGAAA TGG ACA AAG TTG TTC GAA GCC TTT GGG G 
               
               
                   
                   
                 AT TTC GAT GGT AAG TAT ACG AAT TCG ACT TTA ATT CAG TGT CCT AGC 
               
               
                   
                   
                 AAA TTA GCG TTA AAA CTT GAAGAA TTG AAG AAT TCT AAT AAG CGT TCG 
               
               
                   
                   
                 GGG ATC GAA CTG TTA GAA GTG AAG CTG GGT GAG CTT GAC TTC CCA GAG 
               
               
                   
                   
                 CAA TTG AAG TGT ATG GTA GAG GCCGCA GCT CTT AAA CGT AAT AAG 
               
               
                   
               
               
                  59 
                 Methionine 
                 ATG TTT GAG AAG TAT TTT CCA AAT GTT GAC TTG ACC GAG TTA TGG AAT 
               
               
                   
                 import 
                 GCC ACA TAT GAA ACT CTG TAT ATG ACA TTG ATT TCC TTA CTG TTT GC 
               
               
                   
                 system 
                 C TTCGTA ATC GGC GTC ATC CTG GGA TTG CTG TTA TTC TTA ACA TCT AA 
               
               
                   
                 permease 
                 G GGG TCT CTT TGG CAA AAT AAA GCA GTA AAT TCC GTT ATC GCA GCC G 
               
               
                   
                 protein MetP 
                 TT GTC AACATC TTT CGT TCA ATT CCC TTC CTT ATT TTA ATC ATC CTG C 
               
               
                   
                 ( Bacillus   
                 TT CTT GGT TTC ACT AAA TTC TTA GTG GGA ACA ATT TTG GGA CCA AAT 
               
               
                   
                   subtilis ) 
                 GCG GCT CTT CCCGCG TTA GTC ATC GGT AGT GCT CCC TTT TAT GCT CGT 
               
               
                   
                 GenBank: 
                 CTG GTC GAA ATC GCA CTT CGT GAA GTG GAC AAA GGA GTG ATT GAG GCG 
               
               
                   
                 KIX81758.1 
                 GCG AAA TCG ATG GGGGCT AAG ACG AGC ACT ATT ATT TTT AAG GTT CTT 
               
               
                   
                   
                 ATC CCC GAG TCC ATG CCC GCG CTG ATT TCC GGA ATT ACA GTG ACT GC 
               
               
                   
                   
                 G ATT GCA TTG ATC GGG TCAACC GCC ATC GCA GGA GCT ATT GGT TCT GG 
               
               
                   
                   
                 T GGA TTG GGA AAC TTA GCA TAC GTT GAA GGC TAT CAA TCG AAT AAT G 
               
               
                   
                   
                 CG GAT GTG ACC TTC GTG GCC ACAGTT TTC ATC CTG ATT ATT GTT TTC A 
               
               
                   
                   
                 TC ATT CAG ATC ATT GGT GAC CTT ATT ACC AAC ATC ATC GAT AAA CGC 
               
               
                   
               
               
                  60 
                 DL 
                 ATG ATT AAA CTG AGC AAC ATT ACT AAG GTG TTC CAC CAA GGT ACA CGT 
               
               
                   
                 methionine 
                 ACG ATC CAG GCT CTT AAT AAT GTG TCA CTG CAC GTT CCT GCT GGT CA 
               
               
                   
                 transporter 
                 G ATTTAT GGG GTT ATC GGT GCC AGT GGG GCT GGG AAG AGC ACT CTG AT 
               
               
                   
                 subunit MetN 
                 C CGC TGC GTC AAT CTG TTA GAG CGC CCT ACA GAG GGC TCG GTA CTG G 
               
               
                   
                 ( Escherichia   
                 TG GAC GGTCAA GAG TTG ACT ACT CTG TCG GAG TCC GAG TTG ACA AAA G 
               
               
                   
                   coli  K-12]) 
                 CA CGC CGC CAG ATT GGC ATG ATT TTC CAA CAT TTC AAT TTG TTA TCG 
               
               
                   
                 GenBank: 
                 AGC CGT ACA GTTTTC GGG AAC GTG GCC TTA CCA CTG GAG TTG GAC AAT 
               
               
                   
                 CQR79802.1 
                 ACT CCC AAA GAC GAA GTC AAA CGT CGT GTG ACC GAA TTA TTG TCC TTG 
               
               
                   
                   
                 GTG GGT CTT GGT GACAAA CAC GAC AGT TAT CCC AGT AAT TTG AGT GGC 
               
               
                   
                   
                 GGG CAA AAA CAG CGT GTT GCC ATC GCA CGC GCA TTA GCT TCG AAT CC 
               
               
                   
                   
                 C AAG GTG CTG TTA TGT GATGAA GCG ACC AGC GCC CTT GAC CCA GCC AC 
               
               
                   
                   
                 A ACT CGT AGC ATC CTG GAG CTT TTG AAA GAT ATC AAT CGT CGC CTG G 
               
               
                   
                   
                 GT TTG ACC ATC TTA TTG ATT ACGCAC GAG ATG GAC GTT GTA AAG CGT A 
               
               
                   
                   
                 TC TGT GAC TGT GTA GCG GTG ATC TCC AAC GGT GAA TTA ATC GAA CAG 
               
               
                   
                   
                 GAC ACC GTA TCG GAG GTC TTC TCA CATCCT AAG ACA CCC CTT GCA CAA 
               
               
                   
                   
                 AAA TTC ATC CAA AGC ACG CTG CAT TTA GAT ATT CCT GAA GAT TAT CAG 
               
               
                   
                   
                 GAA CGC CTG CAG GCT GAA CCG TTT ACT GATTGC GTT CCA ATG CTT CGC 
               
               
                   
                   
                 TTA GAG TTC ACA GGG CAA TCG GTT GAC GCT CCC TTA TTG AGT GAA AC 
               
               
                   
                   
                 C GCC CGC CGT TTC AAT GTT AAT AAC AAC ATC ATTTCC GCG CAA ATG GA 
               
               
                   
                   
                 C TAC GCG GGG GGT GTT AAA TTT GGA ATC ATG TTA ACC GAA ATG CAC G 
               
               
                   
                   
                 GC ACA CAG CAG GAT ACA CAG GCG GCG ATC GCA TGG CTGCAG GAA CAT C 
               
               
                   
                   
                 AT GTT AAA GTA GAA GTC CTT GGG TAT GTG 
               
               
                   
               
               
                  61 
                 metI 
                 ATGTCTGAGCCGATGATGTGGCTGCTGGTTCGTGGCGTATGGGAAACGCTGGCAATGACCTTC 
               
               
                   
                 ( Escherichia   
                 GTATCCGGTTTTTTTGGCTTTGTGATTGGTCTGCCGGTTGGCGTTCTGCTTTATGTCACGCGT 
               
               
                   
                   coli ) 
                 CCGGGGCAAATTATTGCTAACGCGAAGCTGTATCGTACCGTTTCTGCGATTGTGAACATTTTC 
               
               
                   
                   
                 CGTTCCATCCCGTTCATTATCTTGCTTGTATGGATGATTCCGTTTACCCGCGTTATTGTCGGT 
               
               
                   
                   
                 ACATCGATTGGTTTGCAGGCAGCGATTGTTCCGTTAACCGTTGGTGCAGCACCGTTTATTGCC 
               
               
                   
                   
                 CGTATGGTCGAGAACGCTCTGCTGGAGATCCCAACCGGGTTAATTGAAGCTTCCCGCGCAATG 
               
               
                   
                   
                 GGTGCCACGCCGATGCAGATCGTCCGTAAGGTGCTGTTACCGGAAGCGCTGCCGGGTCTGGTG 
               
               
                   
                   
                 AATGCGGCAACTATCACCCTGATTACCCTGGTCGGTTATTCCGCGATGGGTGGTGCAGTCGGT 
               
               
                   
                   
                 GCCGGTGGTTTAGGTCAGATTGGCTATCAGTATGGCTACATCGGCTATAACGCGACGGTGATG 
               
               
                   
                   
                 AATACGGTACTGGTATTGCTGGTCATTCTGGTTTATTTAATTCAGTTCGCAGGCGACCGCATC 
               
               
                   
                   
                 GTCCGGGCTGTCACTCGCAAGTAA 
               
               
                   
               
               
                  62 
                 metQ 
                 ATGGCGTTCAAATTCAAAACCTTTGCGGCAGTGGGAGCCCTGATCGGATCACTGGCACTGGTA 
               
               
                   
                 ( Escherichia   
                 GGCTGCGGTCAGGATGAAAAAGATCCAAACCACATTAAAGTCGGCGTGATTGTTGGTGCCGAA 
               
               
                   
                   coli ) 
                 CAGCAGGTTGCAGAAGTCGCGCAGAAAGTTGCGAAAGACAAATATGGCCTGGACGTTGAGCTG 
               
               
                   
                   
                 GTAACCTTCAACGACTATGTTCTGCCAAACGAAGCATTGAGCAAAGGCGATATCGACGCCAAC 
               
               
                   
                   
                 GCCTTCCAGCATAAACCGTACCTTGATCAGCAACTGAAAGATCGTGGCTACAAACTGGTCGCA 
               
               
                   
                   
                 GTAGGCAACACTTTTGTTTATCCGATTGCTGGTTACTCCAAGAAAATCAAATCACTGGATGAA 
               
               
                   
                   
                 CTGCAGGATGGTTCGCAGGTTGCCGTGCCAAACGACCCAACTAACCTTGGTCGTTCACTGCTG 
               
               
                   
                   
                 CTGCTGCAAAAAGTGGGCTTGATCAAACTGAAAGATGGCGTTGGCCTGCTGCCGACCGTTCTT 
               
               
                   
                   
                 GATGTTGTTGAGAACCCCAAAAATCTGAAAATTGTTGAACTGGAAGCACCGCAACTGCCGCGT 
               
               
                   
                   
                 TCTCTGGACGACGCGCAAATCGCTCTGGCAGTTATCAATACCACCTATGCCAGCCAGATTGGC 
               
               
                   
                   
                 CTGACTCCGGCGAAAGACGGTATCTTTGTTGAAGATAAAGAGTCCCCGTACGTAAACCTGATC 
               
               
                   
                   
                 GTGACGCGTGAAGATAACAAAGACGCCGAGAACGTGAAGAAATTCGTCCAGGCTTATCAGTCT 
               
               
                   
                   
                 GACGAAGTTTACGAAGCAGCAAACAAAGTGTTTAACGGCGGAGCTGTTAAAGGCTGGTAA 
               
               
                   
               
               
                  63 
                 MetE 
                 ATG ACG ACT ATC AAA ACA TCA AAT CTG GGC TTC CCT CGC ATT GGA CTT 
               
               
                   
                 ( Bacillus   
                 AAT CGC GAA TGG AAA AAA TCA CTG GAA GCG TTT TGG AAA GGT AAC AG 
               
               
                   
                 
                   atrophaeus 
                 
                 C GACAAA GAT ACA TTT CTT AAG CAG ATG GAT GAG TTA TTT CTT ACT GC 
               
               
                   
                 UCMB-5137) 
                 C GTA AAA ACC CAG ATT GAT CAA AAA ATC GAC ATC GTG CCC GTG AGC G 
               
               
                   
                 GenBank: 
                 AC TTC ACTCAC TAC GAC CAC GTT CTT GAC ACA GCT ATC TCT TTT AAT T 
               
               
                   
                 AKL84080.1 
                 GG ATT CCA GAA CGC TTT AAA CAC ATT ACG GAT GCG ACT GAT ACA TAT 
               
               
                   
                   
                 TTC GCG CTG GCACGT GGC ATT AAG GAT GCT GTT AGT TCG GAA ATG ACT 
               
               
                   
                   
                 AAG TGG TTT AAT ACC AAT TAC CAC TAT ATC GTT CCG GAA TAC AAT AAA 
               
               
                   
                   
                 GAC ATC GAA TTC CGTTTA ACC CGC AAC AAG CAG TTA GAG GAC TAC CGC 
               
               
                   
                   
                 CGC GTC AAA CAA GCG TTT GGC GTC GAA ACT AAA CCC GTC ATT GTC GG 
               
               
                   
                   
                 T CCT TAC ACA TTC GTG ACGCTT GCC AAG GGC TAC GAA CAA AGT GAG GC 
               
               
                   
                   
                 C AAA GAA ATC CAA AAG CGT TTA GTC CCA TTG TAT GTG CAA TTA TTG A 
               
               
                   
                   
                 AA GAA TTG GAA CAA GAG GGC GTGCAG TGG GTA CAA ATC GAT GAG CCA G 
               
               
                   
                   
                 CA CTT GTG ACA GCC TCA TCC GAG GAT GTT AGC GCG GCC AAG GAG TTA 
               
               
                   
                   
                 TAC CAG GCC ATT ACG AAT GAG TTA TCCGGC TTG AAT GTC CTT TTG CAG 
               
               
                   
                   
                 ACT TAC TTC GAT TCT GTT GAT GCT TAT GAG GAG TTA ATC AGC TAC CCG 
               
               
                   
                   
                 GTA CAG GGT ATC GGC TTG GAT TTT GTA CACGAT AAA GGG CGC AAC TTG 
               
               
                   
                   
                 GAG CAA TTA AAA GCG CAT GGA TTT CCG AAG GAT AAG GTA TTA GCA GC 
               
               
                   
                   
                 T GGT GTT ATT GAT GGT CGT AAC ATT TGG AAG ACGGAT TTA GAT GAG CG 
               
               
                   
                   
                 C TTG GAC GCC ATC CTT GCG CTG TTA TCT TCG ACG GAC ATT GAC GAA T 
               
               
                   
                   
                 TA TGG ATT CAA CCA AGC AAT TCG CTT CTT CAT GTA CCAGTA GCA AAG C 
               
               
                   
                   
                 AC CCA GAC GAG CAC CTG GAG AAG GAT CTG TTG AAT GGC TTG AGT TAC 
               
               
                   
                   
                 GCA AAA GAA AAG CTG GCA GAA CTG TCC GCT TTA AAA GAG GGTTTG TTA 
               
               
                   
                   
                 TCG GGT AAA GCG GCA ATC TCG GCC GAC ATT CAG CAG GCC AAA GCG GAT 
               
               
                   
                   
                 TTA CAG GCC CTG AAG CAA TTC GCC ACC GGG GCT AAC AGT GAG CAGAAA 
               
               
                   
                   
                 GAG GAA TTA AAT CAG TTG ACC GAG AAA GAC TTT AAG CGC CCG ATC CC 
               
               
                   
                   
                 C TTC GAA GAG CGC CTG AAA ATC CAG AAT GAA TCC TTG GGG CTT CCC C 
               
               
                   
                   
                 TGCTT CCT ACT ACG ACT ATT GGT TCT TTT CCT CAA AGC GCC GAG GTG C 
               
               
                   
                   
                 GT TCG GCG CGC CAA AAG TGG CGC AAA AGT GAG TGG AGC GAC GAG CAA 
               
               
                   
                   
                 TAT CAAGAA TTT ATC AAC GCG GAA ACG AAG CGC TGG ATC GAC ATT CAG 
               
               
                   
                   
                 GAA GAG CTT GAT CTT GAC GTT TTA GTA CAT GGA GAG TTC GAG CGC ACC 
               
               
                   
                   
                 GAC ATG GTCGAA TAT TTC GGT GAG AAA CTG GCT GGA TTC GCG TTT ACT 
               
               
                   
                   
                 AAA TAC GCA TGG GTC CAG AGC TAC GGA TCC CGC TGT GTA CGC CCT CC 
               
               
                   
                   
                 C GTC ATC TAT GGGGAC GTG GAG TTT ATT GAA CCT ATG ACT GTC AAG GA 
               
               
                   
                   
                 C ACA GTG TAC GCT CAA TCT TTA ACG AGT AAG CAG GTT AAA GGG ATG T 
               
               
                   
                   
                 TG ACT GGC CCG GTC ACAATC TTG AAT TGG AGC TTC CCG CGT AAC GAC A 
               
               
                   
                   
                 TT AGC CGT AAG GAG ATC GCC TTC CAA ATC GGG TTA GCT CTT CGC AAA 
               
               
                   
                   
                 GAG GTC AAG GCG TTG GAA GATGCT GGT ATT CAA ATC ATC CAA GTT GAC 
               
               
                   
                   
                 GAA CCG GCC CTG CGT GAA GGG CTG CCT CTG AAA GAA AAC GAT TGG GAA 
               
               
                   
                   
                 GAG TAT TTA ACG TGG GCC GCG GAGGCG TTC CGC TTA ACT ACT TCG GCT 
               
               
                   
                   
                 GTG AAA AAC GAC ACT CAG ATT CAT ACA CAC ATG TGT TAT TCC AAT TT 
               
               
                   
                   
                 T GAG GAC ATT GTC GAC ACA ATT AAT GACTTG GAT GCG GAC GTC ATT AC 
               
               
                   
                   
                 A ATC GAA CAC TCC CGC AGT CAC GGT GGG TTC TTG GAC TAC TTG CGC G 
               
               
                   
                   
                 AT CAT CCG TAT CTT AAA GGT TTA GGT CTT GGCGTG TAC GAT ATT CAC A 
               
               
                   
                   
                 GC CCT CGT GTA CCC CCG ACA GAG GAA ATT TAT AAG ATC ATT GAC GAA 
               
               
                   
                   
                 GCC CTG ACC GTA TGT CCT ACT GAC CGC TTC TGG GTAAAC CCA GAC TGC 
               
               
                   
                   
                 GGG CTG AAG ACC CGT CAC CAG GAG GAA ACG ATT GCC GCG TTG AAG AAC 
               
               
                   
                   
                 ATG GTC GAG GCT GCT AAA CAG GCT CGT GCC AAA CAG AGTCAA CTT GTC 
               
               
                   
               
               
                  64 
                 BrnF 
                 ATG CAG AAA ACA CAG GAG ATT CAC AGC TCG TTA GAG GTT AGC CCC AGT 
               
               
                   
                 ( Corynebacterium   
                 AAA GCT GCT CTG GAG CCC GAC GAT AAG GGG TAT CGT CGT TAC GAA AT 
               
               
                   
                   glutamicum ) 
                 C GCACAA GGC CTG AAG ACC TCT CTT GCT GCA GGC CTG GGA ATG TAT CC 
               
               
                   
                 GenBank: 
                 T ATC GGA ATT GCA TTC GGC TTA CTG GTG ATT CAA TAT GGT TAT GAA T 
               
               
                   
                 AAM46686.1 
                 GG TGG GCCGCT CCA CTG TTC TCC GGC CTG ATT TTT GCG GGG TCT ACG G 
               
               
                   
                   
                 AG ATG CTT GTA ATT GCA CTT GTG GTC GGC GCT GCT CCG CTG GGT GCC 
               
               
                   
                   
                 ATT GCC CTT ACGACC TTA CTT GTT AAT TTC CGT CAT GTT TTC TAT GCC 
               
               
                   
                   
                 TTT TCC TTT CCC TTG CAC GTT GTT AAA AAC CCT ATT GCG CGC TTC TAT 
               
               
                   
                   
                 TCT GTA TTC GCT CTTATT GAT GAA GCA TAC GCT GTT ACA GCC GCT CGT 
               
               
                   
                   
                 CCC GCC GGT TGG AGT GCA TGG CGT CTG ATT TCA ATG CAG ATT GCG TT 
               
               
                   
                   
                 C CAC TCC TAC TGG GTA TTTGGA GGC TTG ACC GGT GTA GCA ATC GCA GA 
               
               
                   
                   
                 G TTA ATT CCT TTC GAG ATC AAA GGC CTG GAG TTC GCA CTT TGT TCG T 
               
               
                   
                   
                 TA TTT GTA ACT CTT ACT TTA GACAGT TGT CGC ACT AAG AAA CAA ATT C 
               
               
                   
                   
                 CG AGT TTG TTA TTG GCT GGA CTG AGC TTT ACT ATC GCG TTA GTA GTG 
               
               
                   
                   
                 ATC CCC GGC CAA GCT CTG TTC GCT GCGTTA CTT ATC TTT CTG GGG CTT 
               
               
                   
                   
                 CTG ACA ATC CGT TAT TTT TTC TTA GGG AAG GCA GCC AAA 
               
               
                   
               
               
                  65 
                 BrnE 
                 ATG ACG ACT GAT TTC TCC TGC ATC CTG TTG GTG GTC GCG GTA TGT GCA 
               
               
                   
                 ( Corynebacterium   
                 GTC ATT ACA TTT GCG CTT CGT GCC GTA CCT TTT CTG ATC TTG AAA CC 
               
               
                   
                   glutamicum ) 
                 C TTGCGT GAA TCG CAA TTT GTG GGA AAA ATG GCC ATG TGG ATG CCT GC 
               
               
                   
                 GenBank: 
                 G GGC ATT CTG GCA ATC CTG ACG GCT TCT ACC TTC CGT TCA AAC GCC A 
               
               
                   
                 AA1146685.1 
                 TC GAT TTAAAG ACG TTG ACG TTC GGT CTG ATT GCC GTG GCA ATC ACA G 
               
               
                   
                   
                 TC GTA GCC CAC TTA TTA GGA GGC CGT CGC ACC TTA TTA TCT GTT GGC 
               
               
                   
                   
                 GCT GGA ACA ATTGTG TTT GTA GGT CTT GTT AAT TTG TTT 
               
               
                   
               
            
           
           
               
            
               
                 Threonine 
               
            
           
           
               
               
               
            
               
                  66 
                 threonine 3- 
                 ATG AAG GCC CTG AGC AAA TTG AAA GCC GAG GAG GGG ATC TGG ATG ACC 
               
               
                   
                 dehydrogenase 
                 GAT GTT CCT GAA CCA GAA GTG GGG CAC AAC GAC CTT TTA ATC AAA AT 
               
               
                   
                 ( Salmonella   
                 T CGCAAG ACT GCA ATC TGC GGG ACA GAC GTA CAT ATC TAT AAC TGG GA 
               
               
                   
                 
                   enterica 
                 
                 C GAG TGG AGT CAA AAA ACT ATT CCC GTC CCT ATG GTG GTC GGG CAC G 
               
               
                   
                 subsp. 
                 AG TAT GTCGGA GAG GTT GTA GGA ATC GGA CAA GAA GTC AAA GGA TTT A 
               
               
                   
                 
                   enterica 
                 
                 AA ATC GGG GAT CGT GTG AGT GGG GAG GGT CAC ATT ACC TGT GGG CAT 
               
               
                   
                 
                   serovar 
                 
                 TGC CGC AAT TGCCGT GGA GGA CGC ACA CAT TTG TGC CGT AAC ACT ACA 
               
               
                   
                 Typhistr. 
                 GGC GTA GGC GTG AAT CGT CCC GGA TGT TTC GCG GAA TAC CTT GTC ATT 
               
               
                   
                 CT18) 
                 CCA GCG TTT AAC GCCTTT AAG ATC CCT GAC AAC ATT TCA GAT GAT TTA 
               
               
                   
                 GenBank: 
                 GCA TCC ATT TTT GAC CCA TTC GGT AAC GCG GTC CAT ACT GCG TTG AG 
               
               
                   
                 CAD03286.1 
                 C TTC GAC TTA GTT GGA GAAGAT GTA TTA GTT TCC GGC GCC GGA CCG AT 
               
               
                   
                   
                 T GGC GTC ATG GCA GCT GCC GTT GCG AAG CAC GTG GGC GCA CGT CAT G 
               
               
                   
                   
                 TG GTA ATT ACG GAC GTA AAT GAGTAT CGT CTG GAG CTG GCA CGT AAA A 
               
               
                   
                   
                 TG GGG GTT ACA CGT GCC GTA AAC GTT GCG AAA GAG TCT TTA AAC GAT 
               
               
                   
                   
                 GTC ATG GCT GAA CTG GGC ATG ACG GAAGGG TTT GAT GTC GGA CTG GAA 
               
               
                   
                   
                 ATG TCC GGT GCC CCG CCA GCC TTC CGT ACC ATG TTG GAC ACC ATG AAC 
               
               
                   
                   
                 CAT GGG GGC CGT ATC GCA ATG TTG GGA ATTCCC CCG AGC GAC ATG TCT 
               
               
                   
                   
                 ATC GAC TGG ACA AAG GTA ATT TTT AAA GGC CTG TTC ATT AAG GGG AT 
               
               
                   
                   
                 T TAC GGT CGT GAG ATG TTT GAG ACG TGG TAC AAGATG GCT GCC TTG AT 
               
               
                   
                   
                 T CAA TCG GGG TTG GAT CTG AGC CCT ATC ATC ACA CAC CGT TTT TCA G 
               
               
                   
                   
                 TG GAT GAC TTT CAA AAA GGG TTT GAC GCC ATG TGC AGCGGT CAA TCA G 
               
               
                   
                   
                 GG AAA GTA ATT CTT TCT TGG GAC 
               
               
                   
               
               
                  67 
                 threonine 
                 ATG ATT GAC CTT CGT TCG GAC ACC GTA ACC CGC CCA TCT CAC GCA ATG 
               
               
                   
                 aldolase 
                 TTG GAA GCT ATG ATG GCC GCG CCT GTG GGG GAT GAC GTT TAT GGG GA 
               
               
                   
                 ( Escherichia   
                 T GACCCG ACC GTC AAC GCT TTA CAA GAT TAC GCT GCT GAA TTG TCG GG 
               
               
                   
                   coli  O26:H11 
                 C AAA GAA GCA GCA ATC TTC TTA CCT ACA GGT ACA CAA GCT AAT CTT G 
               
               
                   
                 str. 
                 TC GCC CTGCTT AGT CAC TGT GAG CGT GGC GAA GAA TAC ATT GTT GGT C 
               
               
                   
                 CVM10026) 
                 AA GCA GCG CAT AAT TAC CTG TTC GAA GCT GGA GGG GCT GCT GTT CTT 
               
               
                   
                 GenBank: 
                 GGT AGC ATT CAGCCC CAA CCC ATT GAT GCT GCT GCC GAT GGT ACT CTT 
               
               
                   
                 EIL35157.1 
                 CCT CTG GAT AAA GTC GCT ATG AAA ATT AAG CCA GAC GAC ATT CAC TTC 
               
               
                   
                   
                 GCA CGC ACA AAG CTGCTG TCG CTT GAG AAT ACA CAC AAT GGA AAA GTC 
               
               
                   
                   
                 CTG CCC CGT GAG TAC CTG AAA GAG GCT TGG GAA TTT ACA CGC GAA CG 
               
               
                   
                   
                 C AAC CTG GCT CTG CAC GTAGAC GGT GCT CGC ATC TTC AAC GCC GTT GT 
               
               
                   
                   
                 C GCC TAC GGT TGC GAA TTG AAA GAG ATT ACG CAA TAC TGT GAC TCC T 
               
               
                   
                   
                 TC ACG ATT TGC TTG TCC AAA GGCTTA GGC ACC CCG GTG GGT TCA TTG T 
               
               
                   
                   
                 TG GTA GGA AAC CGT GAC TAT ATT AAG CGC GCC ATC CGC TGG CGT AAA 
               
               
                   
                   
                 ATG GCA GGG GGT GGA ATG CGT CAA TCAGGG ATT CTT GCG GCA GCT GGC 
               
               
                   
                   
                 ATG TAC GCG CTG AAA AAT AAT GTG GCT CGC CTT CAA GAG GAT CAC GAT 
               
               
                   
                   
                 AAT GCT GCG TGG ATG GCT GAG CAA TTA CGTGAG GCG GGT GCA GAC GTA 
               
               
                   
                   
                 ATG CGC CAA GAT ACC AAT ATG CTG TTC GTA CGT GTT GGG GAA GAA AA 
               
               
                   
                   
                 C GCT GCG GCC TTA GGA GAA TAC ATG AAG GCG CGTAAC GTG TTG ATC AA 
               
               
                   
                   
                 C GCA TCC CCT ATT GTT CGC CTT GTA ACT CAC CTT GAT GTT TCA CGT G 
               
               
                   
                   
                 AA CAA TTG GCG GAA GTT GCC GCC CAC TGG CGT GCC TTTCTT GCT CGC 
               
               
                   
               
               
                  68 
                 serine 
                 ATG CTT AAA CGT GAG ATG AAT ATC GCC GAC TAC GAC GCC GAA TTA TGG 
               
               
                   
                 hydroxymethyl- 
                 CAG GCG ATG GAG CAG GAG AAA GTC CGC CAA GAG GAA CAC ATT GAG CT 
               
               
                   
                 transferase 
                 T ATTGCG TCG GAG AAC TAT ACA TCC CCT CGC GTT ATG CAG GCG CAA GG 
               
               
                   
                 ( Escherichia   
                 C TCA CAG TTG ACG AAC AAA TAC GCT GAG GGA TAT CCG GGA AAG CGT T 
               
               
                   
                   coli ) 
                 AT TAT GGCGGT TGC GAG TAC GTT GAC ATT GTT GAA CAG TTA GCG ATT G 
               
               
                   
                 GenBank: 
                 AT CGT GCT AAG GAG TTA TTT GGA GCG GAT TAT GCC AAT GTT CAA CCT 
               
               
                   
                 AAA23912.1 
                 CAC TCG GGC AGCCAG GCT AAC TTT GCT GTA TAC ACC GCA CTT TTA GAA 
               
               
                   
                   
                 CCT GGT GAC ACG GTC CTG GGT ATG AAT TTG GCC CAT GGA GGC CAC TTA 
               
               
                   
                   
                 ACT CAT GGA AGC CCTGTG AAT TTT AGT GGG AAG TTG TAT AAC ATC GTG 
               
               
                   
                   
                 CCC TAC GGG ATC GAC GCC ACA GGA CAC ATT GAT TAC GCA GAT TTG GA 
               
               
                   
                   
                 G AAA CAA GCC AAG GAA CATAAG CCT AAA ATG ATC ATC GGC GGA TTT TC 
               
               
                   
                   
                 A GCA TAT AGC GGA GTG GTA GAC TGG GCC AAA ATG CGC GAG ATT GCT G 
               
               
                   
                   
                 AT TCG ATT GGT GCT TAC CTG TTTGTC GAT ATG GCG CAT GTC GCT GGT C 
               
               
                   
                   
                 TG GTC GCT GCG GGA GTT TAT CCT AAC CCC GTG CCT CAC GCT CAC GTC 
               
               
                   
                   
                 GTG ACG ACT ACT ACA CAT AAG ACT TTAGCG GGT CCT CGT GGG GGT TTG 
               
               
                   
                   
                 ATT CTT GCG AAG GGG GGC TCA GAG GAA CTT TAT AAG AAG CTT AAC TCT 
               
               
                   
                   
                 GCC GTA TTT CCC GGC GGT CAG GGG GGC CCTCTT ATG CAC GTC ATC GCA 
               
               
                   
                   
                 GGA AAG GCG GTG GCT CTG AAG GAA GCG ATG GAA CCC GAA TTC AAG AC 
               
               
                   
                   
                 T TAC CAA CAG CAA GTA GCC AAA AAC GCC AAA GCCATG GTG GAG GTA TT 
               
               
                   
                   
                 C CTG GAG CGC GGC TAC AAG GTA GTT AGC GGG GGG ACG GAC AAC CAT T 
               
               
                   
                   
                 TG TTC TTA GTC GAT TTA GTG GAC AAA AAC CTT ACT GGTAAG GAG GCT G 
               
               
                   
                   
                 AT GCT GCT CTT GGG CGT GCA AAT ATC ACA GTC AAT AAG AAT AGC GTG 
               
               
                   
                   
                 CCC AAT GAC CCA AAG TCG CCA TTT GTG ACT TCT GGC ATC CGCGTT GGG 
               
               
                   
                   
                 ACT CCG GCA ATC ACC CGT CGT GGC TTT AAG GAG GCA GAG GCC AAG GAG 
               
               
                   
                   
                 CTG GCA GGG TGG ATG TGT GAC GTA CTG GAC TCT ATT AAT GAT GAGGCA 
               
               
                   
                   
                 GTT ATC GAA CGT ATT AAA GGC AAA GTG CTT GAC ATT TGT GCG CGC TA 
               
               
                   
                   
                 C CCC GTG TAT GCC 
               
               
                   
               
               
                  69 
                 tdcC ( Escherichia   
                 ATG TCT ACT TCG GAC TCT ATT GTT TCA TCG CAA ACA AAA CAG TCA TCC 
               
               
                   
                   coli ) 
                 TGG CGT AAA TCA GAT ACC ACC TGG ACT TTG GGT CTG TTT GGT ACC GC 
               
               
                   
                 GenBank: 
                 G ATCGGG GCT GGT GTA TTG TTT TTC CCG ATC CGC GCT GGA TTT GGT GG 
               
               
                   
                 AAA24662.1 
                 T TTA ATT CCT ATC CTG CTG ATG CTT GTA CTG GCA TAT CCT ATT GCT T 
               
               
                   
                   
                 TT TAT TGTCAT CGC GCA GCG CGC TTG TGT TTA AGC GGA AGC AAC CCC T 
               
               
                   
                   
                 CG GGT AAT ATC ACA GAG ACG GTG GAG GAG CAT TTC GGG AAA ACA GGA 
               
               
                   
                   
                 GGG GTC GTA ATCACA TTT CTG TAC TTT TTT GCT ATT TGT CCC CTG TTG 
               
               
                   
                   
                 TGG ATT TAT GGG GTT ACG ATC ACC AAT ACT TTT ATG ACG TTT TGG GAG 
               
               
                   
                   
                 AAT CAA CTG GGC TTTGCA CCG CTT AAC CGC GGA TTC GTG GCG CTG TTC 
               
               
                   
                   
                 CTT TTA CTG TTG ATG GCG TTT GTC ATC TGG TTC GGT AAA GAC TTA AT 
               
               
                   
                   
                 G GTG AAA GTC ATG TCT TATTTG GTA TGG CCT TTC ATT GCT TCA CTT GT 
               
               
                   
                   
                 C TTA ATT AGT CTG TCA TTA ATC CCT TAT TGG AAC TCG GCA GTA ATC G 
               
               
                   
                   
                 AT CAA GTA GAT CTG GGT AGC CTGTCT TTG ACC GGA CAT GAT GGG ATC T 
               
               
                   
                   
                 TA ATT ACC GTA TGG CTG GGC ATT TCT ATT ATG GTC TTT AGT TTT AAC 
               
               
                   
                   
                 TTT TCA CCT ATC GTG TCC TCC TTT GTGGTG TCC AAG CGC GAG GAA TAT 
               
               
                   
                   
                 GAG AAG GAT TTT GGT CGT GAT TTT ACG GAA CGT AAG TGC TCA CAA ATT 
               
               
                   
                   
                 ATT AGC CGC GCG TCT ATG CTT ATG GTG GCTGTC GTT ATG TTC TTT GCT 
               
               
                   
                   
                 TTC TCC TGC TTA TTT ACC TTG TCA CCG GCG AAC ATG GCG GAA GCG AA 
               
               
                   
                   
                 G GCG CAA AAC ATT CCA GTT TTA TCA TAT CTT GCTAAT CAT TTC GCT TC 
               
               
                   
                   
                 T ATG ACA GGG ACC AAA ACT ACT TTT GCC ATC ACA TTG GAG TAT GCG G 
               
               
                   
                   
                 CG TCT ATC ATT GCA TTA GTG GCC ATT TTT AAG TCG TTCTTT GGC CAT T 
               
               
                   
                   
                 AT TTA GGT ACT TTA GAA GGG TTG AAT GGC TTA GTC TTG AAA TTC GGA 
               
               
                   
                   
                 TAC AAG GGG GAC AAA ACT AAA GTT TCC TTG GGT AAG TTG AACACA ATC 
               
               
                   
                   
                 TCG ATG ATC TTT ATT ATG GGG AGT ACA TGG GTC GTT GCG TAT GCA AAT 
               
               
                   
                   
                 CCA AAC ATT CTG GAT TTA ATT GAG GCG ATG GGA GCA CCG ATT ATCGCG 
               
               
                   
                   
                 TCA TTG TTG TGC CTT TTG CCG ATG TAC GCC ATC CGT AAG GCG CCT TC 
               
               
                   
                   
                 A CTG GCC AAA TAT CGT GGG CGC TTG GAT AAC GTG TTC GTA ACC GTC A 
               
               
                   
                   
                 TCGTT TGC 
               
               
                   
               
               
                  70 
                 Threonine/ 
                 ATG CCT GGT TCC TTG CGT AAA ATG CCG GTT TGG TTG CCG ATT GTT ATT 
               
               
                   
                 homoserine 
                 CTT CTG GTT GCA ATG GCT AGC ATC CAA GGA GGC GCT AGT TTA GCA AA 
               
               
                   
                 exporter Rht 
                 A AGTCTG TTT CCT TTG GTG GGG GCA CCG GGT GTG ACC GCG CTG CGT TT 
               
               
                   
                 A 
                 G GCT TTG GGC ACT TTA ATT TTG ATT GCC TTC TTT AAG CCC TGG CGC C 
               
               
                   
                 UniProtKB/ 
                 TT CGT TTTGCT AAA GAA CAA CGT TTG CCG CTT TTG TTC TAC GGC GTC T 
               
               
                   
                 Swiss-Prot: 
                 CA CTT GGT GGC ATG AAC TAT CTT TTT TAT TTA AGC ATC CAA ACC GTA 
               
               
                   
                 POAA67.1 
                 CCC CTG GGT ATTGCG GTG GCT TTG GAG TTC ACG GGT CCA TTG GCA GTT 
               
               
                   
                   
                 GCC CTT TTC AGC TCG CGT CGC CCA GTC GAT TTC GTC TGG GTA GTG CTT 
               
               
                   
                   
                 GCG GTA CTT GGA CTGTGG TTC TTA CTG CCC TTA GGC CAA GAC GTG AGT 
               
               
                   
                   
                 CAC GTA GAC CTT ACC GGG TGT GCG CTG GCT TTG GGA GCC GGT GCT TG 
               
               
                   
                   
                 T TGG GCA ATT TAC ATC CTGTCG GGA CAG CGT GCG GGA GCA GAG CAC GG 
               
               
                   
                   
                 G CCT GCG ACA GTA GCG ATT GGG TCG CTG ATC GCA GCC CTG ATT TTC G 
               
               
                   
                   
                 TC CCC ATT GGT GCC TTA CAG GCAGGA GAG GCG TTG TGG CAC TGG TCA G 
               
               
                   
                   
                 TG ATT CCC TTA GGT TTG GCG GTA GCA ATC CTG TCT ACC GCA CTT CCT 
               
               
                   
                   
                 TAT TCT TTA GAG ATG ATT GCC TTA ACCCGT CTG CCG ACA CGT ACG TTT 
               
               
                   
                   
                 GGC ACC TTA ATG TCG ATG GAA CCG GCA TTG GCT GCC GTT TCA GGT ATG 
               
               
                   
                   
                 ATC TTC CTG GGA GAG ACG TTA ACT CCC ATTCAG TTG TTA GCT CTT GGG 
               
               
                   
                   
                 GCA ATC ATC GCT GCG AGT ATG GGA TCG ACC CTT ACG GTT CGT AAA GA 
               
               
                   
                   
                 G TCG AAG ATT AAA GAA TTG GAC ATC AAT 
               
               
                   
               
               
                  71 
                 rhtB 
                 ATG ACG CTG GAG TGG TGG TTC GCA TAC TTG CTG ACA TCC ATC ATC CTG 
               
               
                   
                 ( Escherichia   
                 AGT TTA AGC CCC GGA TCT GGT GCA ATC AAC ACG ATG ACT ACG TCT TT 
               
               
                   
                   coli  FVEC130 
                 G AATCAC GGC TAT CGT GGT GCT GTT GCA TCC ATT GCC GGC TTG CAG AC 
               
               
                   
                 2) 
                 G GGA TTA GCC ATC CAT ATT GTT TTA GTG GGT GTA GGA CTT GGA ACA T 
               
               
                   
                 GenBank: 
                 TA TTC AGTCGC TCG GTT ATC GCC TTT GAG GTC TTA AAG TGG GCT GGT G 
               
               
                   
                 EFI17945.1 
                 CC GCT TAT TTG ATT TGG CTG GGA ATT CAG CAA TGG CGT GCA GCC GGT 
               
               
                   
                   
                 GCG ATT GAC TTGAAG AGC CTT GCG TCC ACA CAG AGC CGC CGT CAC TTG 
               
               
                   
                   
                 TTT CAA CGT GCA GTA TTC GTC AAT TTG ACC AAC CCC AAA AGT ATC GTC 
               
               
                   
                   
                 TTT CTG GCG GCA CTGTTT CCC CAG TTC ATT ATG CCT CAA CAG CCG CAG 
               
               
                   
                   
                 TTG ATG CAG TAC ATC GTC TTG GGC GTC ACC ACC ATC GTA GTG GAC AT 
               
               
                   
                   
                 T ATT GTA ATG ATT GGA TACGCC ACT CTG GCC CAA CGT ATT GCG CTG TG 
               
               
                   
                   
                 G ATC AAG GGC CCG AAA CAG ATG AAG GCA CTG AAC AAA ATT TTT GGT T 
               
               
                   
                   
                 CT TTG TTT ATG TTG GTT GGG GCACTT CTT GCC AGT GCA CGT CAC GCG 
               
               
                   
               
               
                  72 
                 RhtC  
                 ATG CTG ATG CTT TTT TTA ACA GTA GCA ATG GTG CAT ATC GTC GCA TTG 
               
               
                   
                 threonine 
                 ATG TCA CCG GGA CCT GAC TTT TTT TTT GTT TCA CAA ACA GCA GTA TC 
               
               
                   
                 Rht 
                 A CGCTCA CGT AAG GAG GCA ATG ATG GGT GTC TTA GGG ATC ACT TGC GG 
               
               
                   
                 Transporter 
                 C GTA ATG GTA TGG GCC GGT ATT GCA CTT CTG GGA CTG CAT TTA ATT A 
               
               
                   
                 ( Escherichia   
                 TT GAG AAGATG GCC TGG CTT CAC ACA TTA ATC ATG GTA GGC GGT GGG C 
               
               
                   
                   coli  BL21(DE 
                 TT TAT TTA TGT TGG ATG GGC TAT CAA ATG CTG CGT GGA GCT CTT AAG 
               
               
                   
                 3)) 
                 AAA GAA GCC GTGTCC GCA CCG GCT CCC CAA GTG GAA CTT GCG AAA TCA 
               
               
                   
                 GenBank: 
                 GGT CGC TCC TTC TTG AAG GGG TTG TTG ACT AAT CTT GCG AAC CCT AAG 
               
               
                   
                 CAQ34168.1 
                 GCC ATC ATT TAT TTCGGT TCT GTG TTT AGT TTG TTC GTT GGG GAT AAT 
               
               
                   
                   
                 GTG GGA ACC ACG GAA CGC TGG GGA ATC TTC GCA TTA ATC ATT ATC GA 
               
               
                   
                   
                 G ACG TTA GCT TGG TTC ACCGTC GTG GCC TCC CTT TTT GCT CTG CCG CA 
               
               
                   
                   
                 A ATG CGC CGT GGT TAC CAA CGT TTA GCA AAG TGG ATC GAC GGT TTT G 
               
               
                   
                   
                 CT GGA GCT TTA TTT GCG GGT TTCGGC ATT CAT CTG ATT ATT AGC CGT 
               
               
                   
               
               
                  73 
                 cysteine 
                 ATG CCC CTG CAC AAC TTA ACA CGT TTT CCA CGC CTG GAA TTC ATT GGT 
               
               
                   
                 desulfhydrase 
                 GCA CCG ACT CCC TTG GAA TAT CTG CCT CGC TTT TCG GAC TAC TTA GG 
               
               
                   
                 ( Escherichia   
                 C CGCGAG ATT TTC ATT AAG CGC GAT GAT GTT ACA CCG ATG GCT ATG GG 
               
               
                   
                   coli ) 
                 G GGT AAC AAA TTG CGT AAA TTG GAA TTT CTT GCA GCG GAT GCA CTG C 
               
               
                   
                 GenBank: 
                 GT GAA GGCGCG GAC ACT TTA ATT ACC GCT GGT GCA ATT CAG TCA AAT C 
               
               
                   
                 ALI49110.1 
                 AC GTA CGC CAA ACT GCG GCA GTT GCT GCG AAG TTA GGT CTT CAT TGT 
               
               
                   
                   
                 GTC GCC CTT TTGGAA AAT CCA ATT GGC ACA ACG GCA GAA AAT TAC CTT 
               
               
                   
                   
                 ACC AAC GGG AAC CGT TTG TTG CTT GAC CTT TTT AAC ACA CAG ATC GAA 
               
               
                   
                   
                 ATG TGC GAC GCT TTAACT GAT CCC AAC GCT CAA TTG GAG GAG CTT GCG 
               
               
                   
                   
                 ACT CGC GTG GAA GCT CAA GGC TTC CGT CCG TAT GTT ATT CCG GTC GG 
               
               
                   
                   
                 C GGC AGC AAT GCT CTT GGGGCA TTA GGG TAT GTA GAG TCC GCT CTG GA 
               
               
                   
                   
                 G ATC GCG CAA CAA TGT GAG GGC GCG GTT AAC ATT TCG AGT GTA GTT G 
               
               
                   
                   
                 TG GCC TCT GGA AGT GCG GGC ACCCAC GCC GGG CTG GCT GTG GGT CTT G 
               
               
                   
                   
                 AG CAC TTA ATG CCT GAA TCT GAA CTG ATC GGG GTC ACA GTC TCG CGT 
               
               
                   
                   
                 TCC GTC GCA GAT CAG TTA CCT AAG GTAGTA AAC TTA CAG CAA GCC ATT 
               
               
                   
                   
                 GCG AAA GAA TTA GAA TTA ACC GCT AGT GCA GAA ATC TTA TTA TGG GAT 
               
               
                   
                   
                 GAT TAC TTT GCG CCT GGG TAC GGT GTC CCCAAT GAT GAA GGT ATG GAA 
               
               
                   
                   
                 GCA GTC AAG CTT TTA GCT CGT TTG GAG GGG ATC TTG CTG GAC CCT GT 
               
               
                   
                   
                 T TAC ACC GGC AAA GCA ATG GCA GGC TTA ATT GACGGT ATC AGT CAG AA 
               
               
                   
                   
                 A CGC TTC AAA GAC GAG GGA CCA ATT CTG TTC ATC CAT ACC GGC GGC G 
               
               
                   
                   
                 CT CCT GCC CTT TTT GCC TAC CAC CCT CAC GTT 
               
               
                   
               
               
                  74 
                 tnaA 
                 ATG GAG AAT TTC AAG CAT TTG CCC GAG CCG TTC CGC ATT CGT GTC ATT 
               
               
                   
                 ( Escherichia   
                 GAG CCT GTC AAG CGT ACT ACT CGC GCG TAT CGC GAA GAG GCG ATT AT 
               
               
                   
                   coli  DH1) 
                 C AAATCG GGT ATG AAT CCA TTT TTA CTT GAT TCA GAA GAT GTG TTC AT 
               
               
                   
                 GenBank: 
                 C GAT TTA CTT ACA GAT TCT GGG ACA GGC GCG GTA ACG CAA TCG ATG C 
               
               
                   
                 BAJ45452.1 
                 AA GCA GCGATG ATG CGC GGT GAC GAA GCC TAT TCT GGC TCG CGC TCC T 
               
               
                   
                   
                 AT TAT GCT CTG GCC GAA TCA GTC AAA AAC ATT TTT GGT TAC CAA TAT 
               
               
                   
                   
                 ACG ATT CCC ACGCAT CAG GGA CGC GGA GCA GAG CAA ATC TAT ATC CCA 
               
               
                   
                   
                 GTC TTA ATC AAA AAG CGC GAG CAA GAA AAG GGA TTG GAC CGC TCG AAA 
               
               
                   
                   
                 ATG GTA GCC TTC TCAAAT TAC TTC TTC GAC ACT ACT CAG GGG CAC TCG 
               
               
                   
                   
                 CAA ATC AAC GGC TGC ACT GTT CGC AAT GTG TAT ATC AAG GAA GCC TT 
               
               
                   
                   
                 T GAT ACA GGC GTA CGT TACGAT TTC AAG GGG AAC TTT GAC CTG GAA GG 
               
               
                   
                   
                 T CTT GAA CGT GGC ATT GAA GAA GTA GGA CCC AAC AAC GTA CCC TAT A 
               
               
                   
                   
                 TC GTC GCC ACG ATC ACA TCT AATAGC GCA GGA GGT CAG CCT GTG TCT T 
               
               
                   
                   
                 TG GCG AAT CTG AAA GCG ATG TAT TCG ATC GCC AAA AAG TAT GAT ATC 
               
               
                   
                   
                 CCC GTC GTA ATG GAT TCT GCA CGT TTTGCA GAG AAC GCC TAC TTC ATT 
               
               
                   
                   
                 AAA CAG CGT GAA GCG GAG TAC AAA GAT TGG ACC ATC GAA CAG ATC ACT 
               
               
                   
                   
                 CGT GAG ACT TAT AAA TAT GCT GAC ATG CTGGCT ATG TCG GCT AAG AAG 
               
               
                   
                   
                 GAC GCT ATG GTC CCA ATG GGA GGC CTT TTA TGC ATG AAG GAC GAT AG 
               
               
                   
                   
                 T TTT TTT GAC GTT TAT ACG GAA TGT CGC ACC CTTTGT GTA GTG CAG GA 
               
               
                   
                   
                 A GGA TTC CCC ACT TAT GGC GGC CTT GAA GGT GGA GCG ATG GAA CGT T 
               
               
                   
                   
                 TA GCT GTT GGA CTG TAT GAT GGT ATG AAT CTG GAT TGGCTG GCA TAT C 
               
               
                   
                   
                 GT ATT GCG CAG GTG CAG TAC CTG GTA GAC GGG TTA GAG GAG ATC GGG 
               
               
                   
                   
                 GTT GTG TGC CAG CAG GCC GGG GGC CAT GCG GCG TTC GTG GACGCA GGA 
               
               
                   
                   
                 AAA CTG CTT CCC CAC ATT CCC GCC GAT CAG TTC CCT GCG CAG GCA CTT 
               
               
                   
                   
                 GCT TGC GAG TTA TAC AAG GTG GCC GGT ATC CGT GCG GTA GAG ATCGGC 
               
               
                   
                   
                 TCG TTT CTT TTG GGG CGC GAC CCT AAA ACA GGA AAA CAA TTG CCC TG 
               
               
                   
                   
                 C CCT GCC GAA CTT CTT CGC CTT ACT ATC CCT CGT GCG ACC TAC ACT C 
               
               
                   
                   
                 AAACC CAC ATG GAC TTT ATT ATC GAG GCC TTC AAA CAT GTG AAG GAG A 
               
               
                   
                   
                 AT GCT GCT AAT ATC AAG GGC CTG ACC TTT ACC TAC GAG CCA AAG GTT 
               
               
                   
                   
                 TTG CGCCAC TTT ACA GCA AAA CTT AAA GAA GTT 
               
               
                   
               
               
                  75 
                 cysK 
                 ATG TCA AAA ATT TTC GAG GAT AAC TCG TTA ACG ATC GGC CAC ACT CCC 
               
               
                   
                 ( Escherichia   
                 TTG GTT CGT CTG AAT CGT ATC GGT AAC GGG CGC ATT CTG GCA AAG GT 
               
               
                   
                   coli  O104:H4 
                 T GAATCA CGC AAT CCG TCC TTC TCA GTT AAG TGC CGT ATT GGA GCG AA 
               
               
                   
                 str. C227- 
                 T ATG ATT TGG GAT GCT GAG AAG CGC GGA GTC CTG AAG CCT GGG GTG G 
               
               
                   
                 11) 
                 AG TTG GTGGAG CCA ACC TCT GGG AAT ACA GGT ATC GCG CTG GCT TAT G 
               
               
                   
                 GenBank: 
                 TA GCT GCA GCG CGT GGC TAC AAA TTA ACA CTT ACC ATG CCC GAG ACC 
               
               
                   
                 EGT66151.1 
                 ATG TCA ATC GAACGT CGT AAG TTG TTG AAG GCA TTA GGA GCG AAT CTG 
               
               
                   
                   
                 GTA CTG ACC GAA GGA GCT AAG GGA ATG AAG GGC GCT ATT CAA AAA GCG 
               
               
                   
                   
                 GAA GAA ATT GTC GCAAGT AAC CCC GAA AAG TAT CTT TTA CTG CAA CAG 
               
               
                   
                   
                 TTT TCT AAC CCT GCA AAT CCT GAG ATC CAC GAA AAA ACA ACA GGT CC 
               
               
                   
                   
                 C GAA ATC TGG GAA GAC ACCGAC GGT CAA GTT GAC GTA TTT ATC GCC GG 
               
               
                   
                   
                 G GTA GGA ACT GGA GGA ACC TTA ACG GGG GTC AGT CGT TAT ATT AAG G 
               
               
                   
                   
                 GT ACG AAG GGA AAG ACT GAT TTGATT AGC GTA GCA GTG GAG CCA ACG G 
               
               
                   
                   
                 AT AGT CCT GTT ATT GCC CAA GCC CTG GCG GGG GAG GAA ATC AAA CCG 
               
               
                   
                   
                 GGA CCT CAC AAA ATC CAA GGG ATT GGTGCG GGT TTT ATC CCA GCC AAT 
               
               
                   
                   
                 CTG GAT CTG AAA CTT GTC GAC AAG GTC ATT GGA ATT ACT AAT GAA GAG 
               
               
                   
                   
                 GCG ATC TCC ACT GCG CGC CGT TTG ATG GAGGAA GAA GGG ATT TTG GCA 
               
               
                   
                   
                 GGG ATT TCA AGC GGT GCG GCG GTG GCA GCA GCT TTG AAA TTG CAA GA 
               
               
                   
                   
                 A GAC GAG TCA TTC ACT AAT AAG AAT ATT GTT GTTATT TTA CCA AGC AG 
               
               
                   
                   
                 C GGT GAG CGC TAC TTA TCA ACC GCT TTG TTC GCT GAT TTA TTT ACG G 
               
               
                   
                   
                 AA AAA GAG TTA CAA CAA 
               
               
                   
               
               
                  76 
                 cysM 
                 ATG TCA ACA TTA GAA CAG ACA ATT GGT AAT ACC CCC CTG GTC AAA TTG 
               
               
                   
                 ( Escherichia   
                 CAG CGC ATG GGG CCA AAC AAT GGA AGC GAG GTT TGG CTG AAA TTG GA 
               
               
                   
                   coli  FVEC141 
                 A GGCAAC AAC CCG GCG GGA TCT GTG AAA GAC CGT GCC GCA CTG TCC AT 
               
               
                   
                 2) 
                 G ATC GTA GAA GCT GAG AAA CGT GGC GAG ATT AAA CCT GGG GAT GTT T 
               
               
                   
                 GenBank: 
                 TA ATC GAGGCT ACA AGT GGG AAC ACT GGA ATC GCC CTT GCC ATG ATT G 
               
               
                   
                 EFF01099.1 
                 CG GCT TTA AAG GGT TAT CGT ATG AAG TTA CTT ATG CCC GAT AAC ATG 
               
               
                   
                   
                 AGC CAG GAG CGCCGT GCC GCT ATG CGT GCC TAT GGT GCT GAA CTT ATC 
               
               
                   
                   
                 TTA GTT ACC AAG GAG CAA GGC ATG GAA GGT GCG CGT GAC TTG GCA TTA 
               
               
                   
                   
                 GAA ATG GCG AAT CGTGGC GAA GGG AAG CTG CTT GAC CAA TTT AAT AAT 
               
               
                   
                   
                 CCA GAT AAC CCT TAT GCA CAC TAT ACC ACG ACC GGC CCG GAA ATC TG 
               
               
                   
                   
                 G CAA CAA ACC GGC GGG CGCATC ACC CAC TTT GTA TCA TCC ATG GGC AC 
               
               
                   
                   
                 A ACT GGT ACA ATT ACG GGC GTT TCT CGT TTC ATG CGC GAG CAG AGT A 
               
               
                   
                   
                 AA CCT GTT ACA ATC GTG GGA CTTCAA CCT GAG GAG GGA TCT TCG ATC C 
               
               
                   
                   
                 CA GGC ATT CGT CGT TGG CCT GCT GAG TAC TTA CCT GGC ATT TTC AAC 
               
               
                   
                   
                 GCA TCC TTA GTG GAT GAA GTT CTT GACATT CAT CAG CGC GAA GCA GAG 
               
               
                   
                   
                 AAT ACC ATG CGC GAG TTG GCA GTA CGT GAG GGC ATT TTC TGC GGG GTT 
               
               
                   
                   
                 TCT TCT GGG GGG GCC GTG GCG GGT GCT TTACGT GTC GCC AAA GCA AAC 
               
               
                   
                   
                 CCC GGA GCA GTA GTT GTT GCC ATT ATT TGT GAT CGT GGT GAC CGC TA 
               
               
                   
                   
                 C TTA TCT ACG GGA GTC TTC GGA GAG GAA CAC TTTTCA CAA GGG GCC GG 
               
               
                   
                   
                 A ATT 
               
               
                   
               
               
                  77 
                 malY 
                 ATG TTC GAT TTT TCG AAA GTC GTC GAT CGT CAT GGG ACC TGG TGC ACT 
               
               
                   
                 ( Escherichia   
                 CAA TGG GAC TAC GTG GCG GAC CGC TTT GGG ACA GCA GAT TTG TTA CC 
               
               
                   
                   coli ) 
                 G TTCACT ATT AGC GAC ATG GAT TTT GCC ACA GCA CCT TGC ATT ATC GA 
               
               
                   
                 GenBank: 
                 G GCA CTG AAT CAG CGC TTA ATG CAT GGG GTT TTC GGT TAT AGC CGT T 
               
               
                   
                 AAA24099.1 
                 GG AAG AACGAT GAG TTC CTT GCA GCA ATT GCA CAT TGG TTC AGT ACC C 
               
               
                   
                   
                 AA CAT TAT ACC GCT ATC GAT TCC CAG ACG GTT GTG TAC GGC CCC AGC 
               
               
                   
                   
                 GTT ATT TAC ATGGTG AGC GAA TTG ATC CGT CAG TGG TCT GAA ACA GGA 
               
               
                   
                   
                 GAA GGT GTA GTA ATC CAT ACT CCC GCC TAT GAC GCG TTC TAC AAA GCC 
               
               
                   
                   
                 ATT GAG GGG AAT CAACGT ACA GTA ATG CCC GTT GCC TTA GAA AAA CAG 
               
               
                   
                   
                 GCA GAC GGA TGG TTT TGC GAT ATG GGA AAA TTA GAG GCG GTA CTT GC 
               
               
                   
                   
                 A AAA CCC GAG TGC AAA ATCATG CTT TTA TGC AGT CCG CAA AAC CCA AC 
               
               
                   
                   
                 A GGC AAG GTC TGG ACC TGT GAT GAA TTA GAG ATT ATG GCG GAT TTG T 
               
               
                   
                   
                 GC GAG CGT CAC GGA GTC CGT GTCATC TCT GAC GAG ATT CAC ATG GAC A 
               
               
                   
                   
                 TG GTC TGG GGG GAA CAG CCG CAC ATT CCT TGG TCT AAT GTC GCA CGT 
               
               
                   
                   
                 GGT GAT TGG GCC CTT TTG ACA TCG GGTTCG AAA AGC TTT AAC ATT CCA 
               
               
                   
                   
                 GCC CTG ACC GGG GCA TAT GGA ATT ATC GAA AAC TCG TCG AGC CGT GAC 
               
               
                   
                   
                 GCG TAT TTA TCT GCC CTT AAG GGA CGT GATGGA CTT TCG AGC CCG TCG 
               
               
                   
                   
                 GTT CTT GCC TTG ACG GCA CAC ATT GCT GCT TAC CAA CAG GGA GCG CC 
               
               
                   
                   
                 G TGG CTG GAC GCT CTT CGC ATT TAC CTG AAG GATAAC CTT ACT TAC AT 
               
               
                   
                   
                 T GCG GAT AAG ATG AAT GCG GCC TTC CCA GAA CTT AAC TGG CAG ATT C 
               
               
                   
                   
                 CC CAG TCA ACG TAT TTA GCC TGG CTT GAC CTT CGT CCCTTA AAC ATT G 
               
               
                   
                   
                 AT GAC AAC GCA CTG CAA AAG GCA CTG ATC GAA CAG GAA AAG GTA GCC 
               
               
                   
                   
                 ATC ATG CCT GGC TAT ACC TAC GGC GAG GAG GGC CGT GGG TTCGTC CGC 
               
               
                   
                   
                 CTG AAC GCA GGA TGT CCC CGC TCG AAA CTT GAA AAA GGG GTA GCT GGT 
               
               
                   
                   
                 CTT ATT AAT GCT ATT CGC GCT GTG CGC 
               
               
                   
               
               
                  78 
                 MetC 
                 ATG GCC GAC AAG AAG TTG GAT ACT CAA CTG GTG AAC GCC GGG CGT TCC 
               
               
                   
                 ( Escherichia   
                 AAA AAA TAT ACC TTG GGA GCT GTT AAT AGC GTT ATC CAA CGT GCA TC 
               
               
                   
                   coli ) 
                 A AGTTTA GTT TTC GAT AGT GTC GAA GCA AAG AAG CAT GCG ACA CGC AA 
               
               
                   
                 GenBank: 
                 T CGC GCA AAT GGG GAA TTA TTT TAT GGA CGC CGC GGG ACC TTG ACC C 
               
               
                   
                 ADK47401.1 
                 AC TTC TCTTTA CAG CAG GCC ATG TGT GAG CTG GAA GGG GGA GCC GGT T 
               
               
                   
                   
                 GT GTA TTG TTC CCC TGC GGA GCC GCG GCG GTG GCT AAC AGT ATC CTG 
               
               
                   
                   
                 GCG TTC GTG GAGCAG GGT GAT CAC GTC CTG ATG ACG AAC ACC GCG TAC 
               
               
                   
                   
                 GAA CCC TCG CAA GAC TTC TGC AGT AAA ATC TTA TCC AAA TTA GGT GTG 
               
               
                   
                   
                 ACT ACC TCG TGG TTTGAC CCG TTG ATC GGG GCG GAC ATT GTG AAA CAT 
               
               
                   
                   
                 CTG CAG CCC AAC ACG AAA ATT GTT TTT TTG GAG TCT CCC GGT TCG AT 
               
               
                   
                   
                 T ACT ATG GAG GTA CAC GACGTG CCA GCT ATC GTT GCA GCA GTT CGT TC 
               
               
                   
                   
                 C GTG GCG CCC GAC GCA ATT ATC ATG ATC GAC AAT ACA TGG GCC GCA G 
               
               
                   
                   
                 GC GTC CTT TTT AAA GCC TTA GATTTT GGC ATT GAT GTA AGT ATC CAA G 
               
               
                   
                   
                 CG GCT ACC AAG TAC TTG GTC GGA CAT TCC GAT GCG ATG ATT GGT ACA 
               
               
                   
                   
                 GCA GTA TGC AAT GCA CGC TG TGG GAGCAA TTG CGT GAA AAC GCT TAC 
               
               
                   
                   
                 CTG ATG GGG CAA ATG GTA GAC GCA GAT ACC GCT TAT ATT ACC AGT CGT 
               
               
                   
                   
                 GGG TTG CGT ACA TTA GGA GTG CGT TTG CGTCAA CAC CAC GAG TCA TCC 
               
               
                   
                   
                 CTG AAA GTG GCT GAA TGG CTG GCT GAA CAT CCC CAG GTT GCT CGC GT 
               
               
                   
                   
                 A AAC CAC CCC GCA CTT CCG GGA TCA AAG GGC CATGAA TTT TGG AAG CG 
               
               
                   
                   
                 C GAC TTC ACG GGC TCC AGT GGA TTG TTT TCT TTC GTA CTT AAG AAA A 
               
               
                   
                   
                 AG TTG TCT AAT GAA GAA TTG GCG AAT TAC CTT GAT AACTTT AGC TTG T 
               
               
                   
                   
                 TT AGT ATG GCA TAT AGT TGG GGG GGA TAT GAA TCA CTG ATT TTG GCA 
               
               
                   
                   
                 AAT CAA CCA GAA CAT ATT GCT GCG ATT CGT CCT CAA GGC GAAATT GAT 
               
               
                   
                   
                 TTT AGC GGA ACG TTA ATT CGT CTG CAC ATC GGG CTT GAG GAT GTG GAC 
               
               
                   
                   
                 GAT TTA ATT GCA GAT TTG GAT GCG GGA TTT GCA CGT ATT GTG 
               
               
                   
               
               
                  79 
                 cystathione 
                 ATG TCA GGT GCC CAG CAC TTG TTC GCA GAT TTC AGC GAA GGA TCA GGA 
               
               
                   
                 gamma lyase 
                 TCG TGG CAA CCC CAG GCC CAA GGG TTT GAG ACG CTT CTG GTA CAT GG 
               
               
                   
                 ( Trypanosoma   
                 T GGCGTA AAG CCA GAT CCC GTC ACG GGG GCA ATC CTG ACC CCC GTC TA 
               
               
                   
                   grayi ) 
                 C CAG TCT ACG ACG TTC GTG CAA GAG AGT ATC GAA CGT TAT CAA GCA A 
               
               
                   
                 NCBI 
                 AG GGC TATAGC TAT ACC CGT TCA GCC AAT CCT ACC GTA TCT GCA TTG G 
               
               
                   
                 Reference 
                 AA GAG AAA TTG TGC GCA ATC GAG CAC GGC GAA TAT GCC ACT GTG TAT 
               
               
                   
                 Sequence: 
                 AGC ACC GGC ATGTCC GCT ACG ACA ACG GCC ATC AGT AGT TTT ATG TCT 
               
               
                   
                 XP_009313447.1 
                 GCT GGC GAC CAC GCT ATT GTG ACC GAA TGT AGC TAT GGC GGA ACC AAT 
               
               
                   
                   
                 CGT GCC TGC CGT GTCTTC TTC ACG CGC TTA GGT ATG TCT TTT ACA TTC 
               
               
                   
                   
                 GTA GAT ATG CGC GAC GTT AAA AAT GTA GAG GCT GCC ATC AAA CCC AA 
               
               
                   
                   
                 T ACC AAG CTG GTT ATC TCAGAA TCG CCA GCA AAC CCT ACA CTG ACG CT 
               
               
                   
                   
                 T ACT GAT ATT GAC GCA CTT AGC TCG CTT TGC AAG GCT AAG GGT ATT A 
               
               
                   
                   
                 TT CAC ATG TGT GAC AAC ACT TTCGCA ACC GCT TTC ATT ATG CGT CCG C 
               
               
                   
                   
                 TT GAT CAC GGA GCA GAC GTG ACC CTG ATC TCC ACG ACT AAG TTT GTT 
               
               
                   
                   
                 GAT GGC CAC AAT ATG ACC GTC GGA GGGGCC TTG GTC ACT AAA TCC AAG 
               
               
                   
                   
                 GAA TTA GAC GGA AAG GTA CGT TTA ACG CAA AAT ATC TTA GGT AAC TGT 
               
               
                   
                   
                 ATG AGT CCA TTT GTT GCG TTC CTT CAA TTACAA ACG GTG AAG ACG ATG 
               
               
                   
                   
                 AGC CTT CGC ATT TCT CGT CAA TCA GAA AAC GCC CAG AAA GTA GCG GA 
               
               
                   
                   
                 A TTT CTT GAG ACC CAC CCC GCA GTG GAA CGC GTAATG TAT CCA GGT CT 
               
               
                   
                   
                 T AAA TCT TTC CCA CAG AAG GCC TTA GCG GAT CGT CAG CAC GCA AAC A 
               
               
                   
                   
                 AT TTA CAT GGC GGT ATG TTA TGG TTT GAA GTG CGC GGAGGA ACA GCG G 
               
               
                   
                   
                 CA GGG CGT CGC TTG ATG GAC ACC GTT CAG CGC CCG TGG AGC TTA TGC 
               
               
                   
                   
                 GAG AAT CTG GGT GCG ACG GAA TCC ATC ATT ACT TGC CCG AGTGTC ATG 
               
               
                   
                   
                 ACC CAC GCG AAC ATG ACT ACT GAG GAC CGT ATG AAG GTC GGT ATC ACC 
               
               
                   
                   
                 GAC GGA TTT GTA CGT GTC AGC TGC GGG ATC GAA GAT GCA GCC GATCTT 
               
               
                   
                   
                 ATC TCA GCT TTG AAG GCC GCA CTG GAT GCC TTG GGC AAG 
               
               
                   
               
               
                  80 
                 Cystathione 
                 ATG ATC TTA ACA GCA ATG CAA GAT GCA ATC GGG CGT ACA CCT ATC TTC 
               
               
                   
                 beta - 
                 AAG TTT ACA CGT AAA GAT TAC CCA ATT CCA TTG AAG TCG GCA ATT TA 
               
               
                   
                 synthase 
                 C GCGAAA TTG GAA CAC TTA AAC CCG GGG GGA TCC GTG AAA GAT CGC CT 
               
               
                   
                 ( Helicobacter   
                 T GGG CAG TAT CTT ATT AAG GAG GCC TTC CGT ACA CAC AAG ATT ACC T 
               
               
                   
                 
                   pylori 
                 
                 CT ACT ACCACT ATC ATC GAA CCT ACT GCT GGG AAT ACT GGC ATC GCC C 
               
               
                   
                 2017) 
                 TT GCC CTT GTA GCT ATC AAA CAT CAT CTT AAA ACG ATC TTT GTT GTT 
               
               
                   
                 GenBank: 
                 CCC GAA AAA TTTTCG GTT GAG AAA CAA CAG ATC ATG CGT GCT CTT GGT 
               
               
                   
                 ADZ49193.1 
                 GCC TTA GTA ATC AAT ACG CCT ACC TCA GAG GGT ATC TCA GGG GCC ATT 
               
               
                   
                   
                 AAA AAA AGC AAA GAGTTA GCC GAG TCT ATC CCG GAC AGC TAC TTG CCT 
               
               
                   
                   
                 CTT CAA TTT GAG AAT CCC GAC AAT CCG GCT GCT TAT TAC CAC ACT CT 
               
               
                   
                   
                 T GCT CCT GAA ATT GTA AAGGAA CTG GGG ACG AAT TTT ACC TCT TTT GT 
               
               
                   
                   
                 A GCG GGC ATC GGT TCT GGA GGA ACT TTC GCA GGC ACC GCC AAG TAC C 
               
               
                   
                   
                 TT AAA GAA CGT ATC CCG AAC ATCCGC TTG ATT GGA GTT GAA CCA GAA G 
               
               
                   
                   
                 GT TCT ATT TTA AAT GGG GGT GAA CCG GGG CCC CAC GAA ATC GAA GGA 
               
               
                   
                   
                 ATT GGA GTA GAG TTC ATC CCA CCA TTCTTC GCT AAT TTG GAT ATT GAT 
               
               
                   
                   
                 GGG TTT GAG ACG ATT TCA GAC GAA GAG GGC TTC AGT TAT ACG CGC AAA 
               
               
                   
                   
                 TTA GCC AAA AAG AAC GGA TTA TTA GTG GGTAGT TCG TCC GGA GCA GCG 
               
               
                   
                   
                 TTC GCC GCG GCT CTT AAG GAA GTA CAA CGT CTG CCC GAA GGG TCA CA 
               
               
                   
                   
                 A GTG TTG ACG ATT TTC CCA GAT ATG GCT GAT CGCTAC CTT AGT AAA GG 
               
               
                   
                   
                 C ATT TAT TCC 
               
               
                   
               
               
                  81 
                 putative 
                 ATG CAA GCT TTC TTG AAC CGT TCG TTC GCG CCC CTT TTA AAC CCA AAT 
               
               
                   
                 amino 
                 GAG AAC CTG CTG GAT CAA GTT AAG AGT TCG ATT ATT TTG AAG AAA GG 
               
               
                   
                 transferase 
                 T GTTAGC TAC TTT GAC TGG GGT GCT AGT GGG CTG GCC AGT GCA TTG GT 
               
               
                   
                 ( Helicobacter   
                 C GAG AAA CGT GTT AAG TCC CTG CTT CCA TAT TAT GCC AAT GCC CAC A 
               
               
                   
                 
                   pylori 
                 
                 GC GTA GCAAGT AAA CAT GCC ATC TTA ATG GGC ATG TTA CTT AAA GAA T 
               
               
                   
                 2017) 
                 GC CAA GAG AAG CTG AAA CGC TCG TTA AAC CTT AGT ACT AAC CAT TGC 
               
               
                   
                 GenBank: 
                 GTG CTT AGC GCCGGG TAT GGC GCG AGC TCA GCG ATC AAG AAA TTC CAA 
               
               
                   
                 ADZ50111.1 
                 GAG ATC CTG GGA GTT TGC ATC CCC TCT AAA ACC AAA AAG AAT CTG GAA 
               
               
                   
                   
                 CCT TAT TTA AAA GACATG GCG CTG AAA CGC GTA ATC GTA GGT CCT TAT 
               
               
                   
                   
                 GAA CAT CAC TCT AAC GAG GTC TCT TGG CGC GAG TCT CTT TGT GAG GT 
               
               
                   
                   
                 G GTG CGC ATT CCA CTT AACGAA CAT GGA CTG CTG GAT TTG GAG ATT TT 
               
               
                   
                   
                 A GAG CAG ATC TTA AAG AAA TCC CCC AAT TCT CTG GTC TCC GTC TCG G 
               
               
                   
                   
                 CC GCA AGT AAT GTA ACG GGG ATTCTG ACA CCC CTG AAA GAA ATT AGC T 
               
               
                   
                   
                 CA CTG TGC AAG GAG TAT CGC GCG ATC CTG GCG CTT GAT CTG GCC AAC 
               
               
                   
                   
                 TTT TCC GCA CAC GCG AAC CCG AAA GACTGC GAG TAC CAG ACG GGG TTC 
               
               
                   
                   
                 TAT GCA CCA CAC AAG TTG TTG GGT GGT ATT GGG GGA TGC GGG CTT CTT 
               
               
                   
                   
                 GGA ATC TCC AAA GAC TTG ATC GAT ACA CAGATC CCA CCT AGT TTT TCA 
               
               
                   
                   
                 GCC GGA GGA GTC ATT AAG TAC GCA AAC CGC ACG CGT CAC GAA TTT AT 
               
               
                   
                   
                 T GAT GAG CTG CCG TTG CGT GAG GAG TTC GGA ACTCCG GGA CTG CTG CA 
               
               
                   
                   
                 A TTT TAT CGC TCA GTG TTA GCC TAC CAG TTA CGT GAC GAA TGC GGT T 
               
               
                   
                   
                 TG GAT TTC ATT CAT AAG AAG GAG AAT AAT CTG CTT CGTGTG TTA ATG C 
               
               
                   
                   
                 AT GGC TTG AAA GAT CTG CCA GCT ATC AAC ATT TAC GGC AAT TTA ACC 
               
               
                   
                   
                 GCA AGC CGC GTA GGA GTA GTC GCG TTT AAC ATC GGA GGC ATTAGT CCA 
               
               
                   
                   
                 TAC GAT CTT GCC CGT GTC CTG AGT TAC GAA TAT GCT ATT GAG ACT CGC 
               
               
                   
                   
                 GCA GGG TGC TCT TGT GCC GGC CCG TAT GGA CAT GAC TTA CTG AATTTG 
               
               
                   
                   
                 AAT GCA CAA AAG TCT TCC GAT TTC AAT GCA AAA CCT GGA TGG TTG CG 
               
               
                   
                   
                 C GTC TCA CTT CAT TTT ACA CAC AGT ATT AAT GAC ATT GAC TAT CTG T 
               
               
                   
                   
                 TGGAC TCT CTG AAG AAA GCT GTT AAG AAA CTG CGT 
               
               
                   
               
               
                  82 
                 YdeD 
                 ATG AAC GGT GAA CAC GCC GCG TTG GCC CAC TCC CGC ACA AAA GGG ATT 
               
               
                   
                 ( Bacillus   
                 GCT TTG GTT TTA ACG GGC AGT ATC TTA TGG GGC GTT TCA GGG ACA GT 
               
               
                   
                 
                   atrophaeus 
                 
                 T GCGCAG TAC TTA TTC CAA CAA CAA CAT TTT AAC GTA GAG TGG TTG AC 
               
               
                   
                 UCMB-5137) 
                 C GTC GTT CGC TTG TTG CTG TCT GGT ATC TTG CTG CTT GGC CTT GCC T 
               
               
                   
                 GenBank: 
                 AT CGT AAGGAA AAG CAA CGC ATC TGG GCT GTC TGG AAA GAC AAG ACA G 
               
               
                   
                 AKL87093.1 
                 AT GGT CTG AAT CTG GTT CTG TTC GGG ATT TTG GGG ATG TTG TCC GTC 
               
               
                   
                   
                 CAG TAC ACA TACTTT GCG GCT ATC CAG CAT GGT AAT GCG GCG ACG GCA 
               
               
                   
                   
                 ACT GTA CTT CAG TAT CTG GCC CCG GCA CTT ATT ACC TGC TAC GTA GCC 
               
               
                   
                   
                 ATT CGC TCT AAG CGTCTT CCA ACC GTC AAA GAG TTG ATC GCA GTT TTC 
               
               
                   
                   
                 CTG GCT ATT ATT GGA ACG TTT TTT TTA GTC ACC CAT GGG GAC ATC CA 
               
               
                   
                   
                 C AGT CTT AGT ATC TCA GGGTGG GCT TTA TTC TGG GGA TTA AGT TCG GC 
               
               
                   
                   
                 G TTT GCC CTG GCG TTT TAC ACT TTG CAC CCT CAT AAA CTT CTG GCC A 
               
               
                   
                   
                 AG TGG GGG GCG GCT ATC GTT GTTGGC TGG GGT ATG CTT ATC GGA GGG C 
               
               
                   
                   
                 TT GGT CTT TCC TTA ATC CAT CCT CCA TGG AAA TTT GAG GGA CAG TGG 
               
               
                   
                   
                 TCG GTC TCG GCT TAT GCC GCC GTT ATTTTC ATT GTC CTG TTT GGG ACC 
               
               
                   
                   
                 CTG ACT GCC TTC TAC TGC TAC CTG GAA TCT TTA AAG TAC TTA ACT GCC 
               
               
                   
                   
                 AGC GAA ACT TCA TTA ATC GCC TGC GCG GAGCCC TTA AGT GCT GCG TTC 
               
               
                   
                   
                 TTA AGC GTG ATT TGG TTG CAT GTG ACT TTT GGT ATC AGC GAG TGG CT 
               
               
                   
                   
                 T GGT ACT TGT TGT ATT TTA TCT ACG ATT ATG ATCTTA TCG ATT AAG GA 
               
               
                   
                   
                 G AAG AAG CTG AAG 
               
               
                   
               
               
                  83 
                 protein YfiK 
                 ATG ACA CCC ACG TTG CTT AGC GCC TTC TGG ACG TAC ACC CTT ATT ACA 
               
               
                   
                 ( Escherichia   
                 GCC ATG ACG CCT GGG CCA AAT AAT ATC CTT GCC TTA TCA TCC GCA AC 
               
               
                   
                   coli ) 
                 G TCGCAT GGG TTC CGC CAG TCC ACC CGT GTG CTT GCA GGT ATG TCT CT 
               
               
                   
                 GenBank: 
                 T GGC TTT TTA ATC GTT ATG CTG TTG TGC GCG GGA ATC AGT TTC TCC T 
               
               
                   
                 AJE57139.1 
                 TG GCG GTAATC GAC CCC GCC GCC GTA CAT TTA TTG TCT TGG GCT GGT G 
               
               
                   
                   
                 CC GCG TAT ATT GTT TGG CTG GCT TGG AAA ATT GCC ACG TCT CCG ACT 
               
               
                   
                   
                 AAG GAA GAT GGTTTA CAA GCA AAA CCC ATC TCG TTT TGG GCT TCA TTT 
               
               
                   
                   
                 GCA CTT CAG TTC GTG AAT GTC AAG ATT ATT CTT TAC GGG GTA ACA GCC 
               
               
                   
                   
                 CTG TCC ACT TTC GTTTTA CCC CAG ACG CAG GCG TTG TCA TGG GTA GTC 
               
               
                   
                   
                 GGA GTG TCC GTC TTA TTA GCC ATG ATC GGT ACG TTT GGG AAT GTG TG 
               
               
                   
                   
                 C TGG GCG CTG GCG GGC CACTTG TTT CAA CAA TTA TTC CGT CAG TAC GG 
               
               
                   
                   
                 T CGC CAG TTA AAT ATC GTT CTT GCT TTA TTA CTG GTG TAT TGT GCA G 
               
               
                   
                   
                 TC CGC ATC TTC TAT 
               
               
                   
               
               
                  84 
                 multidrug 
                 ATG ACG ACC CGC CAG CAT AGC TCG TTC GCA ATC GTA TTT ATT CTT GGA 
               
               
                   
                 efflux 
                 TTG CTT GCT ATG TTG ATG CCA TTA TCA ATC GAC ATG TAC TTA CCA GC 
               
               
                   
                 transporter 
                 C CTGCCT GTT ATT TCG GCC CAA TTT GGA GTA CCC GCT GGG TCA ACC CA 
               
               
                   
                 Bcr 
                 A ATG ACA TTA TCA ACA TAC ATT CTG GGG TTC GCT TTA GGA CAG TTG A 
               
               
                   
                 ( Escherichia   
                 TT TAT GGTCCA ATG GCT GAC TCG TTT GGG CGC AAA CCA GTG GTC TTG G 
               
               
                   
                   coli ) 
                 GC GGG ACA CTG GTC TTT GCG GCC GCA GCC GTT GCG TGT GCC TTG GCT 
               
               
                   
                 GenBank: 
                 AAC ACG ATC GACCAG CTT ATT GTA ATG CGT TTC TTC CAT GGC TTA GCT 
               
               
                   
                 CDZ21005.1 
                 GCG GCG GCT GCC AGT GTA GTG ATT AAT GCG CTT ATG CGT GAC ATC TAT 
               
               
                   
                   
                 CCG AAG GAG GAA TTCAGC CGC ATG ATG AGC TTC GTA ATG TTG GTA ACG 
               
               
                   
                   
                 ACC ATC GCT CCA TTA ATG GCC CCT ATT GTT GGG GGT TGG GTC TTA GT 
               
               
                   
                   
                 C TGG CTT TCA TGG CAT TACATT TTT TGG ATC CTT GCC CTG GCG GCT AT 
               
               
                   
                   
                 T CTG GCC TCA GCG ATG ATT TTC TTC CTG ATT AAA GAA ACC CTT CCT C 
               
               
                   
                   
                 CG GAG CGC CGT CAG CCT TTC CATATT CGC ACT ACT ATC GGT AAT TTT G 
               
               
                   
                   
                 CG GCC TTG TTT CGC CAT AAA CGC GTG CTG TCA TAC ATG TTG GCA AGC 
               
               
                   
                   
                 GGC TTT TCT TTC GCG GGT ATG TTC TCGTTT TTA AGT GCT GGT CCC TTC 
               
               
                   
                   
                 GTG TAT ATC GAA ATC AAT CAC GTA GCC CCG GAG AAC TTC GGC TAT TAC 
               
               
                   
                   
                 TTC GCA TTA AAT ATC GTG TTT CTT TTC GTCATG ACC ATC TTC AAC TCT 
               
               
                   
                   
                 CGC TTC GTC CGT CGT ATC GGT GCC TTA AAT ATG TTT CGT TCG GGG CT 
               
               
                   
                   
                 G TGG ATC CAA TTT ATC ATG GCT GCG TGG ATG GTGATC TCC GCA CTG TT 
               
               
                   
                   
                 G GGG CTT GGG TTT TGG TCG CTT GTG GTG GGC GTG GCT GCA TTC GTT G 
               
               
                   
                   
                 GA TGT GTC AGC ATG GTA TCT TCT AAC GCG ATG GCT GTAATT TTG GAT G 
               
               
                   
                   
                 AG TTC CCA CAT ATG GCA GGG ACT GCT TCC TCT CTG GCT GGC ACA TTT 
               
               
                   
                   
                 CGC TTC GGA ATT GGT GCA ATC GTA GGC GCG TTG CTG AGC TTAGCG ACA 
               
               
                   
                   
                 TTC AAT TCG GCG TGG CCC ATG ATT TGG TCC ATT GCG TTT TGT GCG ACC 
               
               
                   
                   
                 AGC AGC ATC CTG TTC TGC CTT TAT GCT TCC CGT CCA AAG AAG CGT 
               
               
                   
               
               
                  85 
                 TolC 
                 ATG AAC AAA CTT AGT ATG CTG GGA GCT GCC TTC GCG TTG TTG GCA GGG 
               
               
                   
                 ( Pseudomonas   
                 AAC TCA GCA TTG GCA GCA ATG GGG CCT TTC GAA ATC TAC GAA CAG GC 
               
               
                   
                 
                   fluorescens 
                 
                 T CTTCGC AAT GAC CCA GTT TTC TTA GGG GCC ATT AAG GAG CGT GAC GC 
               
               
                   
                 R124) 
                 C GGA TTG GAA AAC CGC ATC ATC GGC CGC GCA GGA TTG TTA CCA CGC T 
               
               
                   
                 GenBank: 
                 TG GGG TACAAC TAC AAT CGT GGC CAT AAC ACC TCT AAA GCG ACC CAG T 
               
               
                   
                 EJZ58348.1 
                 TG ACA AAT CGT GGC TCT CTG ACT GAA GAC CGT AAC TAT AAT TCG TAT 
               
               
                   
                   
                 GGT TCA ACT CTTACA TTA CAG CAA CCC TTA TTA GAC TAT GAG GCC TAT 
               
               
                   
                   
                 GCC GCC TAC CGT AAG GGA GTA GCG CAA AGC TTG TTC GCC GAT GAA GCC 
               
               
                   
                   
                 TTT CGC GGT AAG TCACAG GAA TTA TTG GTT CGC GTC TTA GAT AAT TAC 
               
               
                   
                   
                 ACG AAA GCG TTG TTC GCA CAA GAC CAA ATC GAT ATC GCA CAG GCG AA 
               
               
                   
                   
                 A AAA AAA GCT TAT GAA CAACAA TTT CAG CAG AAC GAA CAT ATG TTC AA 
               
               
                   
                   
                 A CAA GGC GAG GGG ACG CGC ACT GAC ATT TTG GAA GCT GAA AGT CGT T 
               
               
                   
                   
                 AT GAA CTT GCC ACG GCA GAA GAAATC GAG GCG CGT AAC GAA CAG GAT G 
               
               
                   
                   
                 CC GCT CTT CGC GAG CTT GGT GCG CTT GTC GGT GTC CCA ACT GTC GAC 
               
               
                   
                   
                 ATT TCT GAA CTT GCA CCC TTA GAC CAGAAT TTT CAA ACG TTC GCG CTG 
               
               
                   
                   
                 ATG CCT GCT AAC TAT GAT ACG TGG CAC GAG TTA GCA ATT TCT AAT AAT 
               
               
                   
                   
                 CCG AAC CTG GCA TCA CAG CGT CAG GCC GTGGAA GTA GCA AAA TAC GAA 
               
               
                   
                   
                 GTT GAA CGT AAC CGT GCA GGA CAT TTA CCC AAG GTC TCA GCA TAT GC 
               
               
                   
                   
                 C AGC ATT CGT CAG ACT GAG TCT GAC AGT GGT AATACC TAC AAT CAA CG 
               
               
                   
                   
                 T TAT GAT ACG AAC ACC ATT GGC TTT GAG GTA AAC GTC CCT CTG TAT G 
               
               
                   
                   
                 CA GGA GGA GGA GTC TCA GCA AGT ACA CGC CAA GCA TCACGC ACG ATG G 
               
               
                   
                   
                 AG CAG GCG GAG TAT GAA TTA GAT GGA AAG ACG CGT GAG ACG TTA ATT 
               
               
                   
                   
                 GAA TTA CGT CGT CAG TTC AGC GCG TGC CTT AGT GGA GTT AATAAG TTA 
               
               
                   
                   
                 CGC GCC TAT CAG AAA GCC CTG GCC TCG GCC GAA GCA CTG GTG GTC TCA 
               
               
                   
                   
                 ACC AAG CAG AGC ATT CTT GGC GGC GAA CGC ACC AAC TTG GAC GCGCTT 
               
               
                   
                   
                 AAC GCG GAA CAG CAG CTG TTC ACC ACG CGT CGC GAC CTT GCA CAG GC 
               
               
                   
                   
                 C CGC TAT GAC TAC TTG ATG GCG TGG ACG AAA CTG CAT TAT TAC GCA G 
               
               
                   
                   
                 GAACC CTG AAC GAA CAA GAT TTA GCG CGT GTG GAC GAG GCA TTT GGC C 
               
               
                   
                   
                 AA GGG CCC AAA TCA AAT CCT CGC 
               
               
                   
               
               
                  86 
                 Tyrosine 
                 ATG TTC GAT GCG CTG GCG CGT CAA GCG GAT GAT CCG CTT TTG GCG CTG 
               
               
                   
                 transaminase 
                 ATC GGA CTG TTT CGC AAA GAC GAG CGC CCC GGT AAA GTG GAC TTA GG 
               
               
                   
                 ( Sinorhizobium   
                 T GTGGGA GTT TAC CGC GAC GAA ACT GGC CGC ACT CCG ATC TTT CGC GC 
               
               
                   
                 
                   meliloti 
                 
                 G GTT AAA GCA GCC GAA AAA CGC TTG CTT GAG ACT CAG GAC TCG AAG G 
               
               
                   
                 AK83) 
                 CC TAC ATCGGC CCG GAA GGA GAC CTG GTT TTT CTT GAC CGT TTG TGG G 
               
               
                   
                 GenBank: 
                 AA CTT GTT GGG GGG GAT ACC ATT GAA CGT TCT CAC GTA GCT GGT GTA 
               
               
                   
                 AEG55340.1 
                 CAA ACA CCT GGCGGG AGC GGC GCA CTT CGT TTG GCG GCA GAT TTA ATC 
               
               
                   
                   
                 GCC CGC ATG GGC GGT CGC GGG ATT TGG TTG GGG TTG CCA TCC TGG CCG 
               
               
                   
                   
                 AAT CAC GCT CCC ATTTTC AAA GCG GCT GGA CTG GAT ATC GCG ACT TAC 
               
               
                   
                   
                 GAT TTC TTT GAT ATC CCG AGT CAA TCC GTT ATT TTT GAT AAC CTG GT 
               
               
                   
                   
                 G TCT GCC CTG GAA GGT GCAGCA TCT GGC GAT GCC GTC TTA TTG CAT GC 
               
               
                   
                   
                 T AGC TGC CAC AAT CCA ACT GGA GGG GTA TTA TCC GAG GCA CAG TGG A 
               
               
                   
                   
                 TG GAA ATT GCC GCG CTG GTC GCCGAA CGC GGA CTG TTA CCA CTT GTT G 
               
               
                   
                   
                 AT CTT GCG TAT CAA GGG TTC GGA CGT GGG CTG GAT CAA GAC GTC GCG 
               
               
                   
                   
                 GGC TTA CGC CAT TTA TTA GGT GTA GTTCCC GAA GCC CTT GTC GCC GTT 
               
               
                   
                   
                 AGC TGC TCT AAA TCG TTC GGC TTG TAC CGC GAA CGC GCT GGA GCC ATC 
               
               
                   
                   
                 TTC GCC CGT ACA TCA TCT ACC GCT TCA GCCGAC CGC GTC CGC AGT AAC 
               
               
                   
                   
                 TTA GCT GGC CTT GCT CGC ACA TCG TAT AGT ATG CCC CCC GAT CAC GG 
               
               
                   
                   
                 G GCC GCG GTT GTC CGT ACG ATC TTA GAC GAC CCAGAG CTG CGT CGT GA 
               
               
                   
                   
                 C TGG ACC GAG GAA TTA GAG ACA ATG CGC TTG CGT ATG ACG GGT CTT C 
               
               
                   
                   
                 GC CGC TCT CTT GCA GAG GGC TTG CGC ACC CGT TGG CAGTCT CTT GGC G 
               
               
                   
                   
                 CC GTA GCT GAC CAA GAA GGG ATG TTC TCG ATG CTG CCG TTG TCC GAA 
               
               
                   
                   
                 GCA GAG GTT ATG CGC CTT CGC ACT GAG CAT GGA ATT TAC ATGCCC GCA 
               
               
                   
                   
                 TCA GGA CGC ATT AAC ATT GCG GGG TTA AAA ACG GCG GAG GCT GCC GAA 
               
               
                   
                   
                 ATT GCA GGT AAA TTT ACG AGT TTG 
               
               
                   
               
               
                  87 
                 tyrosine 
                 ATG AAG AAC CGC ACT CTT GGA TCA GTA TTC ATT GTT GCG GGG ACC ACC 
               
               
                   
                 transporter 
                 ATC GGT GCA GGT ATG CTT GCC ATG CCC CTG GCT GCA GCT GGC GTC GG 
               
               
                   
                 TyrP 
                 G TTCAGC GTT ACC CTG ATT TTA CTG ATT GGT CTG TGG GCT CTG ATG TG 
               
               
                   
                 ( Escherichia   
                 T TAC ACG GCA TTG CTT TTG CTT GAA GTG TAC CAG CAT GTA CCC GCA G 
               
               
                   
                   coli  W) 
                 AC ACC GGTCTT GGC ACT CTG GCG AAA CGT TAT TTA GGA CGT TAT GGT C 
               
               
                   
                 GenBank: 
                 AA TGG CTG ACC GGT TTC TCC ATG ATG TTT CTG ATG TAT GCG CTG ACG 
               
               
                   
                 AFH11702.1 
                 GCC GCA TAC ATTAGT GGT GCA GGT GAA CTG CTG GCA AGT TCA ATT TCT 
               
               
                   
                   
                 GAC TGG ACG GGC ATC TCT ATG AGC GCG ACT GCT GGG GTT TTA TTG TTT 
               
               
                   
                   
                 ACA TTT GTG GCT GGCGGT GTA GTG TGT GTA GGG ACG TCA TTA GTT GAT 
               
               
                   
                   
                 CTG TTT AAC CGC TTC CTT TTC AGT GCA AAA ATC ATT TTC CTT GTA GT 
               
               
                   
                   
                 A ATG CTT GTC TTA TTA TTACCA CAT ATT CAT AAG GTA AAT CTT TTG AC 
               
               
                   
                   
                 A TTA CCA TTG CAG CAG GGA TTG GCG TTA TCA GCC ATC CCT GTA ATC T 
               
               
                   
                   
                 TC ACA TCC TTC GGA TTC CAC GGGTCC GTC CCA TCC ATC GTG TCC TAC A 
               
               
                   
                   
                 TG GAC GGC AAT GTA CGC AAG TTA CGT TGG GTC TTT ATC ACA GGG AGC 
               
               
                   
                   
                 GCC ATT CCC CTT GTA GCG TAT ATT TTTTGG CAA GTT GCT ACT CTG GGG 
               
               
                   
                   
                 TCA ATC GAC TCT ACC ACC TTC ATG GGT TTA CTT GCG AAC CAC GCG GGG 
               
               
                   
                   
                 TTG AAC GGA CTG TTA CAG GCT TTG CGT GAAATG GTT GCC TCG CCA CAT 
               
               
                   
                   
                 GTT GAG TTG GCG GTT CAT CTT TTT GCT GAC TTA GCC TTA GCT ACC TC 
               
               
                   
                   
                 T TTC CTT GGG GTT GCG CTG GGA TTA TTC GAC TATCTG GCT GAT CTT TT 
               
               
                   
                   
                 T CAA CGC TCC AAC ACC GTA GGT GGA CGT TTA CAG ACT GGA GCC ATT A 
               
               
                   
                   
                 CT TTC TTG CCC CCT TTA GCC TTT GCG CTG TTT TAT CCACGT GGG TTT G 
               
               
                   
                   
                 TT ATG GCC TTG GGG TAT GCT GGA GTC GCC TTA GCT GTA CTT GCT CTT 
               
               
                   
                   
                 ATT ATT CCA TCG TTA TTA ACG TGG CAA TCG CGT AAA CAC AACCCC CAA 
               
               
                   
                   
                 GCA GGG TAC CGC GTG AAG GGA GGA CGC CCC GCG CTG GTG GTT GTT TTT 
               
               
                   
                   
                 CTG TGC GGG ATT GCC GTC ATC GGC GTG CAA TTT TTG ATT GCA GCAGGT 
               
               
                   
                   
                 TTG TTG CCG GAG GTG GGG 
               
               
                   
               
            
           
           
               
            
               
                 Phenylalanine 
               
            
           
           
               
               
               
            
               
                  88 
                 Beta- 
                 ATG ACT CAT GCT GCA ATT GAC CAG GCG TTG GCA GAC GCC TAT CGT CGT 
               
               
                   
                 phenylalanine 
                 TTT ACT GAC GCA AAC CCT GCC AGC CAG CGT CAG TTT GAA GCG CAA GCC 
               
               
                   
                 transaminase 
                 CGCTAT ATG CCC GGG GCT AAC TCT CGC TCT GTT TTG TTT TAT GCA CCC 
               
               
                   
                 (Aromatic 
                 TTT CCA TTG ACG ATC GCA CGT GGG GAA GGC GCC GCT CTT TGG GAT GCG 
               
               
                   
                 beta-amino 
                 GAC GGCCAC CGT TAC GCT GAC TTT ATC GCG GAA TAC ACA GCT GGG GTG 
               
               
                   
                 acid 
                 TAT GGA CAC AGT GCC CCA GAG ATT CGT GAC GCA GTA ATC GAA GCT ATG 
               
               
                   
                 aminotransferase; 
                 CAG GGT GGGATT AAT TTG ACG GGT CAT AAT TTG TTG GAA GGC CGC TTA 
               
               
                   
                 Beta- 
                 GCC CGC CTT ATT TGT GAG CGT TTC CCA CAG ATC GAA CAG TTG CGT TTC 
               
               
                   
                 phenylalanine- 
                 ACG AAT AGC GGAACA GAG GCC AAT CTG ATG GCC CTT ACC GCG GCG CTT 
               
               
                   
                 aminotransferase; 
                 CAT TTT ACT GGT CGC CGC AAA ATC GTC GTA TTT AGT GGA GGT TAT CAT 
               
               
                   
                 VpAT) 
                 GGG GGG GTT CTT GGGTTC GGT GCC CGT CCT AGC CCT ACC ACA GTA CCA 
               
               
                   
                 UniProtKB/ 
                 TTT GAC TTC CTT GTG CTG CCT TAC AAC GAT GCT CAG ACG GCT CGT GCT 
               
               
                   
                 Swiss-Prot: 
                 CAG ATC GAG CGC CAC GGCCCG GAG ATC GCG GTC GTG TTA GTC GAG CCC 
               
               
                   
                 H8WR05.1 
                 ATG CAA GGT GCT TCT GGC TGC ATC CCA GGT CAG CCC GAC TTT CTG CAA 
               
               
                   
                   
                 GCC CTG CGC GAA TCC GCT ACTCAG GTA GGG GCG CTG TTA GTT TTT GAC 
               
               
                   
                   
                 GAA GTG ATG ACT AGT CGC TTA GCG CCA CAT GGT TTA GCT AAC AAA TTG 
               
               
                   
                   
                 GGG ATC CGT TCG GAT TTG ACA ACCCTG GGT AAG TAC ATT GGC GGC GGT 
               
               
                   
                   
                 ATG TCA TTT GGG GCC TTT GGC GGT CGT GCT GAT GTC ATG GCC CTG TTC 
               
               
                   
                   
                 GAC CCT CGC ACT GGA CCT TTG GCT CATTCC GGT ACG TTT AAC AAC AAT 
               
               
                   
                   
                 GTG ATG ACG ATG GCT GCC GGT TAT GCT GGC TTA ACG AAA TTA TTC ACT 
               
               
                   
                   
                 CCG GAA GCG GCA GGG GCA TTG GCA GAG CGTGGA GAA GCG CTT CGC GCA 
               
               
                   
                   
                 CGT CTT AAC GCC CTG TGT GCT AAC GAA GGA GTA GCA ATG CAG TTC ACT 
               
               
                   
                   
                 GGC ATC GGC TCG CTG ATG AAT GCC CAC TTC GTCCAG GGA GAC GTT CGT 
               
               
                   
                   
                 AGC TCT GAG GAT CTG GCC GCA GTT GAT GGG CGT TTA CGT CAG TTG TTG 
               
               
                   
                   
                 TTC TTT CAT TTA TTG AAT GAA GAT ATT TAC TCT TCACCG CGT GGG TTT 
               
               
                   
                   
                 GTT GTA TTA TCG TTG CCA TTG ACT GAC GCT GAT ATT GAC CGC TAC GTT 
               
               
                   
                   
                 GCT GCG ATC GGT TCA TTT ATT GGC GGT CAT GGG GCG TTGTTA CCG CGC 
               
               
                   
                   
                 GCT AAC 
               
               
                   
               
               
                  89 
                 gadA 
                 ATGGACCAGAAGCTGTTAACGGATTTCCGCTCAGAACTACTCGATTCACGTTTTGGCGCAAAG 
               
               
                   
                 glutamate 
                 GCCATTTCTACTATCGCGGAGTCAAAACGATTTCCGCTGCACGAAATGCGCGATGATGTCGCA 
               
               
                   
                 decarboxylase 
                 TTTCAGATTATCAATGATGAATTATATCTTGATGGCAACGCTCGTCAGAACCTGGCCACTTTC 
               
               
                   
                 ( Escherichia   
                 TGCCAGACCTGGGACGACGAAAACGTCCATAAATTGATGGATTTGTCGATCAATAAAAACTGG 
               
               
                   
                   coli ) 
                 ATCGACAAAGAAGAATATCCGCAATCCGCAGCCATCGACCTGCGTTGCGTAAATATGGTTGCC 
               
               
                   
                   
                 GATCTGTGGCATGCGCCTGCGCCGAAAAATGGTCAGGCCGTTGGCACCAACACCATTGGTTCT 
               
               
                   
                   
                 TCCGAGGCCTGTATGCTCGGCGGGATGGCGATGAAATGGCGTTGGCGCAAGCGTATGGAAGCT 
               
               
                   
                   
                 GCAGGCAAACCAACGGATAAACCAAACCTGGTGTGCGGTCCGGTACAAATCTGCTGGCATAAA 
               
               
                   
                   
                 TTCGCCCGCTACTGGGATGTGGAGCTGCGTGAGATCCCTATGCGCCCCGGTCAGTTGTTTATG 
               
               
                   
                   
                 GACCCGAAACGCATGATTGAAGCCTGTGACGAAAACACCATCGGCGTGGTGCCGACTTTCGGC 
               
               
                   
                   
                 GTGACCTACACCGGTAACTATGAGTTCCCACAACCGCTGCACGATGCGCTGGATAAATTCCAG 
               
               
                   
                   
                 GCCGACACCGGTATCGACATCGACATGCACATCGACGCTGCCAGCGGTGGCTTCCTGGCACCG 
               
               
                   
                   
                 TTCGTCGCCCCGGATATCGTCTGGGACTTCCGCCTGCCGCGTGTGAAATCGATCAGTGCTTCA 
               
               
                   
                   
                 GGCCATAAATTCGGTCTGGCTCCGCTGGGCTGCGGCTGGGTTATCTGGCGTGACGAAGAAGCG 
               
               
                   
                   
                 CTGCCGCAGGAACTGGTGTTCAACGTTGACTACCTGGGTGGTCAAATTGGTACTTTTGCCATC 
               
               
                   
                   
                 AACTTCTCCCGCCCGGCGGGTCAGGTAATTGCACAGTACTATGAATTCCTGCGCCTCGGTCGT 
               
               
                   
                   
                 GAAGGCTATACCAAAGTACAGAACGCCTCTTACCAGGTTGCCGCTTATCTGGCGGATGAAATC 
               
               
                   
                   
                 GCCAAACTGGGGCCGTATGAGTTCATCTGTACGGGTCGCCCGGACGAAGGCATCCCGGCGGTT 
               
               
                   
                   
                 TGCTTCAAACTGAAAGATGGTGAAGATCCGGGATACACCCTGTACGACCTCTCTGAACGTCTG 
               
               
                   
                   
                 CGTCTGCGCGGCTGGCAGGTTCCGGCCTTCACTCTCGGCGGTGAAGCCACCGACATCGTGGTG 
               
               
                   
                   
                 ATGCGCATTATGTGTCGTCGCGGCTTCGAAATGGACTTTGCTGAACTGTTGCTGGAAGACTAC 
               
               
                   
                   
                 AAAGCCTCCCTGAAATATCTCAGCGATCACCCGAAACTGCAGGGTATTGCCCAGCAGAACAGC 
               
               
                   
                   
                 TTTAAACACACCTGA 
               
               
                   
               
               
                  90 
                 glutamate 
                 ATG GAT AAA AAG CAA GTG ACG GAC CTG CGC TCT GAA CTT CTT GAC AGT 
               
               
                   
                 decarboxylase 
                 CGT TTT GGG GCA AAG AGT ATT AGT ACC ATT GCT GAG TCA AAG CGT TT 
               
               
                   
                 ( Escherichia   
                 T CCTTTG CAT GAG ATG CGC GAT GAC GTC GCA TTC CAG ATT ATC AAC GA 
               
               
                   
                   coli  KO11FL) 
                 C GAG CTG TAT TTG GAC GGC AAT GCC CGC CAA AAC TTG GCC ACG TTT T 
               
               
                   
                 GenBank: 
                 GT CAG ACTTGG GAT GAC GAG AAT GTT CAT AAA CTT ATG GAC CTT TCA A 
               
               
                   
                 ADX50933.1 
                 TT AAC AAA AAT TGG ATT GAC AAA GAA GAG TAC CCC CAA TCT GCC GCA 
               
               
                   
                   
                 ATT GAT TTA CGTTGT GTT AAT ATG GTG GCC GAC TTA TGG CAT GCA CCA 
               
               
                   
                   
                 GCC CCT AAA AAC GGC CAA GCG GTG GGA ACC AAC ACG ATC GGG TCT AGT 
               
               
                   
                   
                 GAG GCA TGT ATG TTAGGC GGG ATG GCC ATG AAG TGG CGT TGG CGT AAA 
               
               
                   
                   
                 CGC ATG GAG GCA GCA GGG AAA CCA ACC GAT AAA CCT AAT TTA GTC TG 
               
               
                   
                   
                 C GGA CCG GTT CAG ATC TGTTGG CAT AAA TTT GCG CGC TAC TGG GAT GT 
               
               
                   
                   
                 G GAA TTA CGC GAA ATT CCG ATG CGT CCG GGC CAA CTG TTC ATG GAT C 
               
               
                   
                   
                 CC AAA CGT ATG ATC GAA GCA TGTGAC GAA AAC ACG ATT GGG GTG GTA C 
               
               
                   
                   
                 CC ACC TTT GGG GTC ACA TAT ACA GGT AAC TAC GAG TTT CCA CAA CCG 
               
               
                   
                   
                 TTG CAT GAT GCT CTG GAC AAG TTT CAAGCT GAC ACC GGG ATC GAC ATT 
               
               
                   
                   
                 GAT ATG CAC ATT GAC GCT GCC TCC GGC GGA TTC TTG GCC CCA TTT GTA 
               
               
                   
                   
                 GCC CCT GAC ATT GTC TGG GAC TTT CGT CTTCCC CGT GTG AAA TCC ATC 
               
               
                   
                   
                 AGC GCA TCC GGT CAC AAG TTT GGG CTT GCC CCA TTA GGG TGT GGA TG 
               
               
                   
                   
                 G GTC ATC TGG CGT GAT GAG GAA GCA TTA CCC CAAGAA CTT GTC TTC AA 
               
               
                   
                   
                 T GTA GAT TAC CTT GGG GGA CAG ATT GGC ACT TTT GCC ATC AAC TTT T 
               
               
                   
                   
                 CT CGC CCA GCG GGT CAA GTG ATC GCC CAG TAT TAC GAGTTT CTG CGC C 
               
               
                   
                   
                 TG GGA CGT GAG GGA TAT ACA AAA GTG CAG AAC GCA TCG TAC CAG GTA 
               
               
                   
                   
                 GCG GCT TAC CTT GCG GAC GAA ATT GCA AAG CTG GGA CCA TACGAG TTT 
               
               
                   
                   
                 ATC TGT ACC GGG CGT CCA GAT GAA GGT ATT CCG GCT GTG TGT TTT AAG 
               
               
                   
                   
                 CTG AAA GAC GGG GAA GAT CCC GGA TAT ACG CTG TAT GAT CTG TCTGAA 
               
               
                   
                   
                 CGT TTA CGT TTG CGC GGT TGG CAA GTT CCA GCC TTC ACG TTG GGT GG 
               
               
                   
                   
                 C GAA GCC ACT GAT ATT GTA GTC ATG CGT ATC ATG TGT CGT CGC GGC T 
               
               
                   
                   
                 TTGAA ATG GAT TTC GCA GAG TTA CTT CTG GAA GAC TAC AAA GCG AGC T 
               
               
                   
                   
                 TA AAA TAT TTG TCT GAC CAT CCC AAG TTG CAA GGG ATC GCA CAG CAA 
               
               
                   
                   
                 AAT TCGTTT AAA CAC ACT 
               
               
                   
               
               
                  91 
                 GltT 
                 ATG AAG AAA TTA CGC TTC GGA CTG GCG ACT CAA ATC TTT GTG GGG CTG 
               
               
                   
                 ( Bacillus   
                 ATT CTT GGG GTA GTA GTG GGC GTT ATC TGG TAC GGT AAT CCG GCG GT 
               
               
                   
                 
                   atrophaeus 
                 
                 G GTAACT TAT TTG CAG CCA GTT GGG GAC CTT TTT TTA CGT TTG ATT AA 
               
               
                   
                 UCMB-5137) 
                 A ATG ATC GTT ATT CCT ATC GTG GTG TCT TCT TTG ATC ATT GGC GTC G 
               
               
                   
                 GenBank: 
                 CG GGA GCTGGG TCC GGA AAA CAG GTC GGA AAG CTG GGC TTT CGT ACT A 
               
               
                   
                 AKL83763.1 
                 TT CTG TAC TTC GAG ATC ATC ACT ACC TTT GCC ATC ATT CTG GGA CTT 
               
               
                   
                   
                 GCT CTG GCG AATCTT TTC CAG CCT GGT ACA GGA GTA AAT ATC GAG AGC 
               
               
                   
                   
                 GCG CAG AAA AGT GAC ATT TCC CAG TAC GTG GAG ACT GAA AAA GAG CAA 
               
               
                   
                   
                 TCC ACC AAA TCC GTAGCT GAG ACT TTC CTG CAT ATC GTG CCC ACC AAT 
               
               
                   
                   
                 TTC TTT CAA TCA CTT GCG GAA GGT GAT CTT CTT GCT ATT ATC TGC TT 
               
               
                   
                   
                 T ACC GTA CTT TTC GCC CTTGGC ATT TCG GCT ATC GGT GAA CGT GGC AA 
               
               
                   
                   
                 A CCG GTG CTT GCT TTC TTT GAC GGA GTA TCC CAC GCG ATG TTT CAT G 
               
               
                   
                   
                 TA GTG AAC CTT GTG ATG AAG GTTGCT CCG TTC GGC GTA TTT GCT CTG A 
               
               
                   
                   
                 TT GGA GTA ACA GTA AGC AAA TTT GGA CTG GGT TCT TTA CTG AGC CTG 
               
               
                   
                   
                 GGT AAA CTT GTG GGG CTG GTA TAT GTTGCT CTG GCA TTT TTT CTT ATT 
               
               
                   
                   
                 GTA ATC TTT GGT ATT GTT GGA AAG CTG GCT GGC GTG AAT ATC TTC AAG 
               
               
                   
                   
                 TTT TTA GCT TAC ATG AAG GAT GAA ATC TTATTA GCG TTC TCG ACC TCA 
               
               
                   
                   
                 TCG TCC GAG ACT GTG TTG CCC CGC ATC ATG GAG AAA ATG GAG AAG AT 
               
               
                   
                   
                 C GGG TGT CCA AAG GGA ATT GTA AGC TTT GTA GTCCCC ATC GGT TAC AC 
               
               
                   
                   
                 A TTC AAT CTT GAC GGC TCG GTC TTA TAC CAA TCT ATT GCT GCG CTG T 
               
               
                   
                   
                 TC TTG GCA CAG GTT TAC GGA ATC GAC CTG ACT ATT TGGCAT CAG ATT A 
               
               
                   
                   
                 CT CTG GTG TTA GTT CTG ATG GTC ACT AGC AAA GGC ATG GCA GCC GTT 
               
               
                   
                   
                 CCT GGA ACT AGC TTT GTA GTC CTG CTG GCA ACC TTA GGT ACCATT GGT 
               
               
                   
                   
                 GTT CCA GCG GAA GGG CTT GCA TTC ATT GCG GGG GTT GAC CGC ATT ATG 
               
               
                   
                   
                 GAC ATG GCT CGC ACT GTG GTC AAT TTA ACA GGC AAT GCT CTT GCGAGT 
               
               
                   
                   
                 GTC GTA ATG AGC AAG TGG GAG GGT CAG TAC GAC CCG GTG AAA GGT GC 
               
               
                   
                   
                 A GAG ATT ATG AGC CGC AGC AAG ACG GAA CAG GAC GCT ACT ATC TCC G 
               
               
                   
                   
                 GA 
               
               
                   
               
               
                  92 
                 mechanosensitive 
                 ATG GAG GAC TTG AAC GTA GTA GAT AGC ATT AAT GGA GCG GGC TCA TGG 
               
               
                   
                 channel Msc 
                 TTA GTA GCC AAC CAA GCC CTG TTG TTA TCG TAT GCT GTA AAT ATC GT 
               
               
                   
                 S 
                 C GCAGCC TTA GCC ATC ATT ATC GTT GGG TTA ATC ATC GCC CGT ATG AT 
               
               
                   
                 ( Escherichia   
                 T TCT AAT GCG GTG AAT CGC TTA ATG ATC TCG CGC AAG ATC GAC GCC A 
               
               
                   
                   coli ) 
                 CT GTC GCGGAT TTC TTG TCC GCC CTG GTG CGT TAC GGT ATC ATC GCG T 
               
               
                   
                 GenBank: 
                 TC ACA TTG ATT GCG GCA TTA GGG CGC GTA GGA GTC CAG ACA GCT TCT 
               
               
                   
                 CTX26261.1 
                 GTG ATT GCG GTATTA GGT GCA GCA GGA TTA GCT GTG GGA TTG GCG TTA 
               
               
                   
                   
                 CAG GGG TCT CTT TCC AAT CTG GCG GCC GGC GTA CTT CTG GTT ATG TTT 
               
               
                   
                   
                 CGC CCC TTT CGC GCCGGA GAG TAT GTG GAT TTG GGA GGA GTG GCC GGA 
               
               
                   
                   
                 ACA GTG CTG TCA GTG CAA ATC TTT TCT ACC ACG ATG CGT ACA GCA GA 
               
               
                   
                   
                 T GGA AAA ATC ATC GTG ATCCCC AAT GGC AAG ATC ATC GCG GGT AAC AT 
               
               
                   
                   
                 T ATC AAC TTC TCC CGC GAA CCT GTT CGC CGC AAC GAA TTT ATC ATC G 
               
               
                   
                   
                 GT GTT GCC TAT GAT TCA GAC ATCGAT CAG GTC AAA CAA ATT CTT ACG A 
               
               
                   
                   
                 AC ATC ATT CAG TCA GAG GAC CGT ATT CTG AAA GAC CGC GAA ATG ACG 
               
               
                   
                   
                 GTG CGT TTG AAT GAG TTA GGG GCT TCAAGT ATC AAC TTC GTA GTC CGC 
               
               
                   
                   
                 GTG TGG AGC AAT TCC GGT GAT TTG CAA AAC GTG TAT TGG GAC GTC CTT 
               
               
                   
                   
                 GAG CGC ATT AAG CGT GAA TTC GAT GCT GCCGGG ATC TCC TTT CCG TAT 
               
               
                   
                   
                 CCT CAG ATG GAT GTG AAT TTC AAG CGT GTA AAG GAA GAT AAG GCT GC 
               
               
                   
                   
                 C 
               
               
                   
               
               
                  93 
                 HutH 
                 ATG ATG GTC ACC TTG GAT GGG TCT TCA TTA ACG ACG GCT GAT GCA CAA 
               
               
                   
                 ( Bacillus   
                 CGT GTA CTT TTC GAT TTT GAA GAG GTA CAG GCA TCG GCT GAA TCG AT 
               
               
                   
                   amylolique - 
                 G GAGCGC GTA AAA AAG AGC CGT GCC GCC GTG GAA CGC ATT GTA CAA GA 
               
               
                   
                 
                   faciens 
                 
                 A GAA AAA ACT ATC TAC GGA ATC ACT ACG GGG TTT GGT AAG TTT TCC G 
               
               
                   
                 subsp. 
                 AT GTG CTGATC CAA AAA GAG GAC GCT GCG GAT TTA CAA TTG AAT TTG A 
               
               
                   
                 
                   plantarum 
                 
                 TC TTG TCA CAT GCA TGT GGA GTC GGC GAT CCT TTC CCA GAG TCA GTC 
               
               
                   
                 str. FZB42) 
                 TCC CGC GCC ATGCTG CTT CTG CGT GCA AAC GCA TTG TTA AAA GGC TTC 
               
               
                   
                 GenBank: 
                 TCC GGT GTT CGT ACG GAA TTA ATT GAC CAG CTT TTA GCG TAC TTA AAC 
               
               
                   
                 ABS75970.1 
                 CAC CGT ATC CAC CCTGTT ATC CCC CAA CAA GGT TCG CTG GGG GCC TCC 
               
               
                   
                   
                 GGC GAT TTG GCC CCT CTT AGC CAC CTT GCG TTG GCA CTG ATC GGA CA 
               
               
                   
                   
                 A GGG GAA GTG TTC TAC GAAGGA GCA CGT ATG CCC ACT GCT CAT GCC CT 
               
               
                   
                   
                 T GAA CAA ACC AAT CTG CAG CCC GCA GTC CTG ACA TCG AAG GAA GGG C 
               
               
                   
                   
                 TG GCG TTG ATC AAT GGG ACT CAGGCT ATG ACC GCA ATG GGC TTA ATC G 
               
               
                   
                   
                 CA TAC CTT GAA GCC GAA AAG TTG GCA TAT CAG AGC GAG CGC ATC GCT 
               
               
                   
                   
                 TCA TTG ACT ATC GAA GGA TTG CAA GGTATT ATT GAC GCG TTT GAC GAA 
               
               
                   
                   
                 GAT ATT CAT GCC GCT CGT GGA TAC CAG GAA CAA ATG GAT GTC GCT GAG 
               
               
                   
                   
                 CGC ATT CGC TAT TAT CTT TCG GAT TCG AAGCTG ACA ACC GTA CAA GGC 
               
               
                   
                   
                 GAG CTG CGT GTG CAA GAT GCT TAC TCC ATT CGC TGC ATC CCT CAA GT 
               
               
                   
                   
                 C CAC GGA GCT TCT TGG CAG ACC CTG GCG TAT GTGAAG GAG AAG TTA GA 
               
               
                   
                   
                 A ATT GAG ATG AAC GCT GCT ACT GAT AAC CCT TTA ATT TTT GAA GAC G 
               
               
                   
                   
                 GG GCC AAA ATT ATC TCG GGG GGG AAC TTT CAC GGG CAACCG ATC GCG T 
               
               
                   
                   
                 TT GCA ATG GAC TTC TTG AAA GTA GCT GCT GCT GAG TTG GCT AAT ATC 
               
               
                   
                   
                 AGC GAG CGC CGT ATT GAG CGT CTT GTC AAT CCA CAG CTG AATGAC CTT 
               
               
                   
                   
                 CCT CCT TTT CTT TCG CCG CAA CCG GGT TTA CAG TCT GGT GCC ATG ATT 
               
               
                   
                   
                 ATG CAG TAC GCC GCT GCC TCC TTG GTC TCG GAA AAC AAA ACA CTTGCG 
               
               
                   
                   
                 CAT CCC GCC TCA GTC GAC TCA ATC CCC TCC TCG GCT AAC CAG GAG GA 
               
               
                   
                   
                 T CAC GTC TCC ATG GGG ACG ATC GCT TCA CGT CAT GCT TAC CAG ATT A 
               
               
                   
                   
                 TTGCA AAC ACT CGT CGC GTA TTA GCC GTC GAG GCC ATT TGC GCT TTA C 
               
               
                   
                   
                 AA GCT GTA GAG TAC CGT GGG GAA GAG CAC TGC GCT AGC TAC ACG AAA 
               
               
                   
                   
                 CAA CTTTAC CAT GAG ATG CGT AAC ATC GTG CCA TCG ATT CAG GAG GAC 
               
               
                   
                   
                 CGT GTT TTC TCG TAC GAC ATC GAG CAC TTA TCC GAC TGG CTT AAA AAG 
               
               
                   
                   
                 GAA TCC TTCTTA CCT AAT GAA CAC CAC CAA AAG TTA ATG ACT AAT GAG 
               
               
                   
                   
                 GGC GGG TTA ACT CGC 
               
               
                   
               
               
                  94 
                 Histidine 
                 ATG AAG AAA CTT GTC CTT TCA TTG TCT CTG GTA TTA GCG TTC AGT TCA 
               
               
                   
                 ABC 
                 GCA ACT GCA GCA TTC GCT GCT ATT CCG CAA AAT ATC CGC ATC GGG AC 
               
               
                   
                 transporter, 
                 G GATCCC ACG TAT GCG CCA TTC GAG TCA AAG AAT TCA CAA GGT GAA TT 
               
               
                   
                 histidine- 
                 G GTC GGG TTC GAT ATT GAC CTG GCG AAA GAA TTG TGT AAA CGT ATC A 
               
               
                   
                 binding 
                 AT ACC CAATGC ACG TTC GTG GAA AAT CCC TTG GAT GCA TTA ATT CCG T 
               
               
                   
                 periplasmic 
                 CT TTG AAA GCG AAA AAA ATC GAT GCC ATC ATG TCA TCC CTT TCT ATC 
               
               
                   
                 protein 
                 ACA GAA AAG CGCCAG CAG GAG ATT GCC TTC ACA GAC AAG TTG TAC GCT 
               
               
                   
                 precursor H 
                 GCA GAC AGC CGC CTG GTC GTT GCA AAG AAT TCT GAC ATT CAA CCT ACC 
               
               
                   
                 isJ 
                 GTG GAA TCG CTG AAGGGC AAG CGC GTA GGG GTC TTG CAG GGC ACT ACT 
               
               
                   
                 ( Escherichia   
                 CAG GAA ACA TTT GGG AAC GAA CAT TGG GCG CCT AAG GGA ATT GAG AT 
               
               
                   
                   coli  O145:H 
                 C GTG TCT TAT CAG GGT CAGGAT AAC ATC TAC AGT GAT CTG ACA GCC GG 
               
               
                   
                 28 str. 
                 A CGT ATT GAC GCC GCT TTT CAG GAC GAG GTG GCG GCA TCT GAA GGG T 
               
               
                   
                 RM12581]) 
                 TC TTA AAG CAG CCA GTC GGC AAAGAC TAC AAA TTT GGT GGG CCG AGC G 
               
               
                   
                 GenBank: 
                 TG AAG GAC GAG AAA TTG TTT GGG GTA GGA ACA GGG ATG GGC TTG CGT 
               
               
                   
                 AHY71563.1 
                 AAG GAG GAC AAT GAA TTA CGT GAA GCTCTT AAT AAA GCC TTT GCT GAG 
               
               
                   
                   
                 ATG CGT GCG GAC GGG ACT TAC GAA AAA CTT GCA AAA AAG TAT TTC GAC 
               
               
                   
                   
                 TTT GAC GTC TAC GGC GGT 
               
               
                   
               
               
                  95 
                 Histidine 
                 ATG CTG TAT GGA TTC AGT GGC GTT ATC TTG CAG GGG GCT CTT GTC ACT 
               
               
                   
                 ABC 
                 TTA GAG TTA GCT ATC TCG TCC GTT GTG TTA GCT GTC ATT ATT GGA CT 
               
               
                   
                 transporter, 
                 T ATCGGG GCT GGT GGC AAA TTG AGT CAG AAC CGT TTG AGC GGC CTT AT 
               
               
                   
                 permease 
                 T TTT GAA GGG TAC ACA ACC TTA ATT CGC GGA GTC CCA GAC TTA GTG C 
               
               
                   
                 protein His 
                 TG ATG TTGCTT ATT TTC TAT GGT TTA CAG ATC GCT TTG AAT ACG GTT A 
               
               
                   
                 Q 
                 CC GAG GCA ATG GGG GTC GGC CAA ATC GAT ATC GAT CCT ATG GTG GCT 
               
               
                   
                 ( Escherichia   
                 GGA ATC ATT ACTTTG GGC TTC ATT TAC GGG GCA TAT TTC ACG GAG ACG 
               
               
                   
                   coli  O145:H 
                 TTC CGC GGA GCT TTC ATG GCC GTC CCG AAG GGC CAC ATT GAA GCG GCA 
               
               
                   
                 28 str. 
                 ACA GCT TTT GGA TTCACT CGT GGG CAA GTT TTC CGT CGC ATC ATG TTT 
               
               
                   
                 RM12581) 
                 CCA GCG ATG ATG CGC TAT GCG CTT CCT GGG ATC GGG AAT AAC TGG CA 
               
               
                   
                 GenBank: 
                 G GTA ATC TTA AAA TCG ACGGCT TTA GTC AGT TTA TTG GGG TTG GAA GA 
               
               
                   
                 AHY71562.1 
                 T GTC GTA AAA GCG ACC CAG TTG GCT GGG AAA TCG ACT TGG GAG CCC T 
               
               
                   
                   
                 TT TAC TTC GCT ATT GTG TGT GGCGTT ATT TAC TTA GTT TTC ACT ACA G 
               
               
                   
                   
                 TA TCA AAC GGT GTG TTA TTG TTT TTG GAA CGT CGC TAC AGC GTG GGT 
               
               
                   
                   
                 GTA AAG CGT GCT GAT TTG 
               
               
                   
               
               
                  96 
                 hisP 
                 ATG TCC GAG AAC AAA TTA AAT GTT ATC GAT TTG CAT AAG CGT TAT GGA 
               
               
                   
                 ( Escherichia   
                 GAG CAT GAA GTG TTG AAA GGA GTG TCT CTT CAA GCA AAC GCG GGG GA 
               
               
                   
                   coli  EPEC 
                 C GTAATT TCT ATC ATC GGA TCG TCT GGT TCT GGT AAG TCA ACC TTC CT 
               
               
                   
                 C342-62) 
                 G CGT TGT ATT AAC TTC TTA GAG AAG CCG TCT GAG GGT TCT ATT GTA G 
               
               
                   
                 GenBank: 
                 TT AAT GGGCAG ACC ATC AAT CTT GTG CGC GAT AAG GAC GGC CAG TTG A 
               
               
                   
                 EIQ70323.1 
                 AA GTG GCA GAC AAA AAC CAA CTT CGT TTG CTT CGC ACC CGT CTT ACC 
               
               
                   
                   
                 ATG GTA TTC CAACAC TTC AAC CTG TGG TCG CAC ATG ACG GTA CTT GAG 
               
               
                   
                   
                 AAC GTG ATG GAA GCG CCA ATT CAG GTA CTT GGA TTG AGC AAA CAA GAA 
               
               
                   
                   
                 GCC CGC GAA CGT GCGGTG AAA TAT TTG GCC AAG GTG GGT ATC GAC GAG 
               
               
                   
                   
                 CGT GCG CAG GGC AAA TAC CCC GTT CAC TTG TCC GGG GGT CAA CAA CA 
               
               
                   
                   
                 G CGT GTC AGT ATT GCC CGCGCT CTG GCT ATG GAA CCA GAG GTG CTT CT 
               
               
                   
                   
                 G TTT GAC GAG CCG ACG TCA GCT TTG GAC CCG GAA TTA GTG GGC GAA G 
               
               
                   
                   
                 TA TTG CGC ATC ATG CAG CAG TTAGCA GAA GAA GGC AAG ACC ATG GTT G 
               
               
                   
                   
                 TT GTC ACA CAC GAA ATG GGG TTT GCG CGT CAT GTC TCG ACT CAT GTA 
               
               
                   
                   
                 ATC TTC TTG CAT CAA GGT AAA ATC GAGGAA GAA GGA GCG CCG GAA CAG 
               
               
                   
                   
                 TTA TTC GGG AAT CCT CAA TCC CCC CGT CTG CAG CAG TTT CTT AAA GGG 
               
               
                   
                   
                 TCC TTA AAG 
               
               
                   
               
               
                  97 
                 proline 
                 ATG TCA ATG TCC GCT GAG CAC GCT GAG GAA TTA AAA AAT GAA CCT GCG 
               
               
                   
                 reductase 
                 GTC GTT TGT TGT CGC ACT GAG GAG GGG ACC ATC TTG TCA GCC GAT AA 
               
               
                   
                 ( Clostridium   
                 T TTGGAA GAC CCA AAC ATT TTT CCA GAT ATG GTG GAT AGC GGT TTA CT 
               
               
                   
                   botulinum ) 
                 G AAC ATT CCT GGG GAC TGC TTA AAA GTT GGG GAA GTA ATC GGG GCC A 
               
               
                   
                 NCBI 
                 AA CTG CTTAAG ACG ATT GAC TCT TTG ACC CCT CTT GCC AAG GAC ATC A 
               
               
                   
                 Reference 
                 TT GAG GGG GCC AAA TCC TTA GAC GGA GAC GTA CGC AGT AAA TCA GAG 
               
               
                   
                 Sequence: 
                 ATT CAG ATC GAATCA CCA GAG GAG AAG GCG ATC CTT AAA AAC AAT TTG 
               
               
                   
                 WP_02493365 
                 AAG GCG GGA GAT ATT ATC AAG GTT GAG GAC CTG GAG AAC CCT ATG CAC 
               
               
                   
                 3.1 
                 TTC GCC AAG TTA CAAGAT TCG CTT CTT ATC AAG CTG GAT GAG AAA GTG 
               
               
                   
                   
                 CTT ACG CGC CGC GAA GTT GTA GAC GCG AAA CTT ACG GAA GAT GCA CC 
               
               
                   
                   
                 G GCG ATT TCA GGG GTC ACTGCA TCA ATG TTG GAA GGC TTC GAG GAA AA 
               
               
                   
                   
                 G GCC CTG GAG ATT ACC CAA GAT AGC AAG GAT GTG GAC TTC AAT TCA G 
               
               
                   
                   
                 TA ATT CCA CTG AAC GGC AAT CGTGAA TTC CTT CGT TTG AAA ATC GAG G 
               
               
                   
                   
                 AA GGC ACA GGC ATT TAT ATC GAA ATT CCC TTT ACC CAA GTC 
               
               
                   
               
               
                  98 
                 Proline 
                 ATG TCA GAA AAA CTT CCG GCA CCT CGC GAG GGT TTA TCC GGT AAA GCT 
               
               
                   
                 porter II 
                 ATG CGT CGT GTT GTC ATG GGT AGC TTT GCC GGT GCA TTA ATG GAA TG 
               
               
                   
                 ( Escherichia   
                 G TATGAT TTC TTC ATC TTT GGG ACG GCG GCG GGT CTT GTT TTT GCA CC 
               
               
                   
                   coli  PMV- 
                 G CTG TTT TAT CCT GAC AGT GAT CCG TTT ATT GGG TTG ATC GCG TCG T 
               
               
                   
                 1) 
                 TC GCT ACATTT GGA GTT GGT TTT TTG ACC CGC CCG TTA GGA GGT ATC G 
               
               
                   
                 GenBank: 
                 TG TTC GGT CAT TTT GGT GAC AAG ATC GGG CGT AAG ATT ACC TTA ATC 
               
               
                   
                 CDH67546.1 
                 TGG ACA TTG GCGATT GTG GGG TGT TCT ACA TTC TTA ATC GGT TTC ATT 
               
               
                   
                   
                 CCA ACG TAC CAA GAA ATC GGC ATT TGG GCC CCT TTG GTC CTT ATG GTT 
               
               
                   
                   
                 TTG CGC CTG ATT CAGGGT TTT GGC TTG GGA GGA GAA TAC GGA GGG GCG 
               
               
                   
                   
                 GCG TTA ATG ACC ATC GAA AGT GCC CCC GAA AGC CGC CGT GGT TTT CT 
               
               
                   
                   
                 T GGG TCA TTG CCA CAG ACGGCC GCC AGC GTC GGC ATC ATG CTT GCA AC 
               
               
                   
                   
                 G GGT ATT TTC GCG CTT TGT AAT CAT TTC CTT ACT TCT GAA CAG TTC T 
               
               
                   
                   
                 TA TCA TGG GGC TGG CGT ATT CCCTTC TGG TTG TCC GCG GTT ATG TTA A 
               
               
                   
                   
                 TC GTC GGA CTT TTT ATC CGT CTG CAT ACT GAA GAG ACG CTT GAC TTT 
               
               
                   
                   
                 CAG AAG CAA AAA ACG ACT AAC AAT AAAGAA AAG TCG GTT CCC CCC CTT 
               
               
                   
                   
                 ATC GAG CTT TTT AAG AAA CAT CCA CGC AAT ATT TTG TTG GCC TTG GGG 
               
               
                   
                   
                 GCC CGC CTT GCG GAG TCA GTA AGC AGC AACATC ATT AAT GCA TTC GGC 
               
               
                   
                   
                 ATC GTC TAT ATC AGC AGT CAA CTT GCA CTG AGC CGT GAC ATC CCC TT 
               
               
                   
                   
                 G ACT GGG ATG CTG ATT GCA AGC GCC ATC GGA ATTTTT AGT TGC CCA TT 
               
               
                   
                   
                 G GTA GGC TGG CTT TCG GAC CGT ATC GGA CAG AAA TCA TTA TAT TTG T 
               
               
                   
                   
                 CA GGC GCT GGA TTT TGT GTC CTG TTT GCC TTC CCG TTTTTT CTG CTG T 
               
               
                   
                   
                 TG GAC TCG AAG AGT ACA CTG ATT ATC TGG TGC TCA ATG ATT TTG GGC 
               
               
                   
                   
                 TAT AAC TTG GGT CCA ACT ATG ATG TTT GCT GTA CAA CCA ACATTG TTT 
               
               
                   
                   
                 ACT CGT ATG TTC GGC ACC AAG GTC CGC TAC ACA GGC TTA TCA TTT GCT 
               
               
                   
                   
                 TAC CAG TTC TCG GCT ATC TTA GGC GGC CTG TCC CCA CTG ATT GCATCC 
               
               
                   
                   
                 TCA CTT CTT GCG TTG GGG GGC GGC AAA CCC TGG TAT GTC GCC TTG TT 
               
               
                   
                   
                 C CTT TTC GCT GTG TCC GTG TTA TCT TTC GTC TGT GTA TGG TTA ATC G 
               
               
                   
                   
                 AGCCC ACA GAC GAA CAA GAG ACG GCT TCA TAC CGC TAC ATC CGC GAA C 
               
               
                   
                   
                 AA AGT CAT GAG AAC 
               
               
                   
               
               
                  99 
                 
                   Escherichia 
                 
                 ATGAAAAACGCGTCAACCGTATCGGAAGATACTGCGTCGAATCAAGAGCCGACGCTTCATCGC 
               
               
                   
                   coli  PheP 
                 GGATTACATAACCGTCATATTCAACTGATTGCGTTGGGTGGCGCAATTGGTACTGGTCTGTTT 
               
               
                   
                   
                 CTTGGCATTGGCCCGGCGATTCAGATGGCGGGTCCGGCTGTATTGCTGGGCTACGGCGTCGCC 
               
               
                   
                   
                 GGGATCATCGCTTTCCTGATTATGCGCCAGCTTGGCGAAATGGTGGTTGAGGAGCCGGTATCC 
               
               
                   
                   
                 GGTTCATTTGCCCACTTTGCCTATAAATACTGGGGACCGTTTGCGGGCTTCCTCTCTGGCTGG 
               
               
                   
                   
                 AACTACTGGGTAATGTTCGTGCTGGTGGGAATGGCAGAGCTGACCGCTGCGGGCATCTATATG 
               
               
                   
                   
                 CAGTACTGGTTCCCGGATGTTCCAACGTGGATTTGGGCTGCCGCCTTCTTTATTATCATCAAC 
               
               
                   
                   
                 GCCGTTAACCTGGTGAACGTGCGCTTATATGGCGAAACCGAGTTCTGGTTTGCGTTGATTAAA 
               
               
                   
                   
                 GTGCTGGCAATCATCGGTATGATCGGCTTTGGCCTGTGGCTGCTGTTTTCTGGTCACGGCGGC 
               
               
                   
                   
                 GAGAAAGCCAGTATCGACAACCTCTGGCGCTACGGTGGTTTCTTCGCCACCGGCTGGAATGGG 
               
               
                   
                   
                 CTGATTTTGTCGCTGGCGGTAATTATGTTCTCCTTCGGCGGTCTGGAGCTGATTGGGATTACT 
               
               
                   
                   
                 GCCGCTGAAGCGCGCGATCCGGAAAAAAGCATTCCAAAAGCGGTAAATCAGGTGGTGTATCGC 
               
               
                   
                   
                 ATCCTGCTGTTTTACATCGGTTCACTGGTGGTTTTACTGGCGCTCTATCCGTGGGTGGAAGTG 
               
               
                   
                   
                 AAATCCAACAGTAGCCCGTTTGTGATGATTTTCCATAATCTCGACAGCAACGTGGTAGCTTCT 
               
               
                   
                   
                 GCGCTGAACTTCGTCATTCTGGTAGCATCGCTGTCAGTGTATAACAGCGGGGTTTACTCTAAC 
               
               
                   
                   
                 AGCCGCATGCTGTTTGGCCTTTCTGTGCAGGGTAATGCGCCGAAGTTTTTGACTCGCGTCAGC 
               
               
                   
                   
                 CGTCGCGGTGTGCCGATTAACTCGCTGATGCTTTCCGGAGCGATCACTTCGCTGGTGGTGTTA 
               
               
                   
                   
                 ATCAACTATCTGCTGCCGCAAAAAGCGTTTGGTCTGCTGATGGCGCTGGTGGTAGCAACGCTG 
               
               
                   
                   
                 CTGTTGAACTGGATTATGATCTGTCTGGCGCATCTGCGTTTTCGTGCAGCGATGCGACGTCAG 
               
               
                   
                   
                 GGGCGTGAAACACAGTTTAAGGCGCTGCTCTATCCGTTCGGCAACTATCTCTGCATTGCCTTC 
               
               
                   
                   
                 CTCGGCATGATTTTGCTGCTGATGTGCACGATGGATGATATGCGCTTGTCAGCGATCCTGCTG 
               
               
                   
                   
                 CCGGTGTGGATTGTATTCCTGTTTATGGCATTTAAAACGCTGCGTCGGAAATAA 
               
               
                   
               
               
                 100 
                 
                   Anabaena 
                 
                 ATGAAAACACTATCACAGGCCCAATCTAAAACTTCTTCACAGCAATTCAGCTTTACCGGGAAC 
               
               
                   
                 
                   variabilis 
                 
                 TCGTCTGCGAATGTAATTATCGGCAATCAAAAGCTGACCATTAATGATGTAGCTCGCGTTGCC 
               
               
                   
                 PAL1 
                 CGGAATGGCACTTTGGTGTCACTGACGAACAATACCGACATTCTGCAAGGTATTCAAGCTAGC 
               
               
                   
                   
                 TGCGATTATATCAATAACGCCGTTGAATCTGGCGAGCCAATCTACGGGGTAACAAGCGGTTTT 
               
               
                   
                   
                 GGTGGGATGGCGAACGTTGCCATTAGCCGTGAACAGGCGAGCGAACTTCAGACCAACCTCGTT 
               
               
                   
                   
                 TGGTTCCTAAAGACAGGAGCTGGTAATAAGTTACCTCTGGCTGACGTAAGAGCCGCGATGCTG 
               
               
                   
                   
                 CTTCGCGCTAATAGTCACATGCGCGGCGCCAGTGGTATCCGTCTTGAGCTTATCAAGAGGATG 
               
               
                   
                   
                 GAAATCTTCCTCAACGCGGGTGTCACACCATATGTTTATGAGTTTGGTAGTATCGGAGCCAGT 
               
               
                   
                   
                 GGTGATCTTGTTCCCCTGAGTTATATTACGGGTTCATTGATTGGTTTAGACCCGTCCTTTAAA 
               
               
                   
                   
                 GTGGATTTTAACGGGAAAGAAATGGACGCCCCGACCGCTTTACGACAGCTTAATCTGAGCCCA 
               
               
                   
                   
                 CTTACTTTGCTCCCTAAAGAAGGTCTTGCCATGATGAATGGCACCTCTGTGATGACTGGAATT 
               
               
                   
                   
                 GCCGCGAATTGTGTGTATGACACGCAGATCCTAACGGCCATTGCCATGGGTGTTCACGCGTTG 
               
               
                   
                   
                 GACATTCAAGCCCTGAATGGTACAAACCAGTCGTTTCATCCGTTTATCCATAATTCAAAACCC 
               
               
                   
                   
                 CATCCGGGACAGCTTTGGGCTGCTGATCAGATGATCTCACTCCTGGCCAATAGTCAACTGGTT 
               
               
                   
                   
                 CGGGACGAGCTCGACGGCAAACATGATTATCGCGATCATGAGCTCATCCAGGACCGGTATTCA 
               
               
                   
                   
                 CTTCGTTGTCTCCCACAATACCTGGGGCCTATCGTTGATGGTATATCTCAAATTGCGAAGCAA 
               
               
                   
                   
                 ATTGAAATTGAGATCAATAGCGTAACCGACAACCCGCTTATCGATGTTGATAATCAGGCCTCT 
               
               
                   
                   
                 TATCACGGTGGCAATTTTCTGGGCCAGTATGTTGGTATGGGGATGGATCACCTGCGGTACTAT 
               
               
                   
                   
                 ATTGGGCTTCTGGCTAAACATCTTGATGTGCAGATTGCCTTATTAGCTTCACCAGAATTTTCA 
               
               
                   
                   
                 AATGGACTGCCGCCATCATTGCTCGGTAACAGAGAAAGGAAAGTAAATATGGGCCTTAAGGGC 
               
               
                   
                   
                 CTTCAGATATGTGGTAACTCAATCATGCCCCTCCTGACCTTTTATGGGAACTCAATTGCTGAT 
               
               
                   
                   
                 CGTTTTCCGACACATGCTGAACAGTTTAACCAAAACATTAACTCACAGGGCTATACATCCGCG 
               
               
                   
                   
                 ACGTTAGCGCGTCGGTCCGTGGATATCTTCCAGAATTATGTTGCTATCGCTCTGATGTTCGGC 
               
               
                   
                   
                 GTACAGGCCGTTGATTTGCGCACTTATAAAAAAACCGGTCACTACGATGCTCGGGCTTGCCTG 
               
               
                   
                   
                 TCGCCTGCCACCGAGCGGCTTTATAGCGCCGTACGTCATGTTGTGGGTCAGAAACCGACGTCG 
               
               
                   
                   
                 GACCGCCCCTATATTTGGAATGATAATGAACAAGGGCTGGATGAACACATCGCCCGGATATCT 
               
               
                   
                   
                 GCCGATATTGCCGCCGGAGGTGTCATCGTCCAGGCGGTACAAGACATACTTCCTTGCCTGCAT 
               
               
                   
                   
                 TAA 
               
               
                   
               
               
                 101 
                 
                   Photorhabdus 
                 
                 ATGAAAGCTAAAGATGTTCAGCCAACCATTATTATTAATAAAAATGGCCTTATCTCTTTGGAA 
               
               
                   
                 
                   luminescens 
                 
                 GATATCTATGACATTGCGATAAAACAAAAAAAAGTAGAAATATCAACGGAGATCACTGAACTT 
               
               
                   
                 PAL3 
                 TTGACGCATGGTCGTGAAAAATTAGAGGAAAAATTAAATTCAGGAGAGGTTATATATGGAATC 
               
               
                   
                   
                 AATACAGGATTTGGAGGGAATGCCAATTTAGTTGTGCCATTTGAGAAAATCGCAGAGCATCAG 
               
               
                   
                   
                 CAAAATCTGTTAACTTTTCTTTCTGCTGGTACTGGGGACTATATGTCCAAACCTTGTATTAAA 
               
               
                   
                   
                 GCGTCACAATTTACTATGTTACTTTCTGTTTGCAAAGGTTGGTCTGCAACCAGACCAATTGTC 
               
               
                   
                   
                 GCTCAAGCAATTGTTGATCATATTAATCATGACATTGTTCCTCTGGTTCCTCGCTATGGCTCA 
               
               
                   
                   
                 GTGGGTGCAAGCGGTGATTTAATTCCTTTATCTTATATTGCACGAGCATTATGTGGTATCGGC 
               
               
                   
                   
                 AAAGTTTATTATATGGGCGCAGAAATTGACGCTGCTGAAGCAATTAAACGTGCAGGGTTGACA 
               
               
                   
                   
                 CCATTATCGTTAAAAGCCAAAGAAGGTCTTGCTCTGATTAACGGCACCCGGGTAATGTCAGGA 
               
               
                   
                   
                 ATCAGTGCAATCACCGTCATTAAACTGGAAAAACTATTTAAAGCCTCAATTTCTGCGATTGCC 
               
               
                   
                   
                 CTTGCTGTTGAAGCATTACTTGCATCTCATGAACATTATGATGCCCGGATTCAACAAGTAAAA 
               
               
                   
                   
                 AATCATCCTGGTCAAAACGCGGTGGCAAGTGCATTGCGTAATTTATTGGCAGGTTCAACGCAG 
               
               
                   
                   
                 GTTAATCTATTATCTGGGGTTAAAGAACAAGCCAATAAAGCTTGTCGTCATCAAGAAATTACC 
               
               
                   
                   
                 CAACTAAATGATACCTTACAGGAAGTTTATTCAATTCGCTGTGCACCACAAGTATTAGGTATA 
               
               
                   
                   
                 GTGCCAGAATCTTTAGCTACCGCTCGGAAAATATTGGAACGGGAAGTTATCTCAGCTAATGAT 
               
               
                   
                   
                 AATCCATTGATAGATCCAGAAAATGGCGATGTTCTACACGGTGGAAATTTTATGGGGCAATAT 
               
               
                   
                   
                 GTCGCCCGAACAATGGATGCATTAAAACTGGATATTGCTTTAATTGCCAATCATCTTCACGCC 
               
               
                   
                   
                 ATTGTGGCTCTTATGATGGATAACCGTTTCTCTCGTGGATTACCTAATTCACTGAGTCCGACA 
               
               
                   
                   
                 CCCGGCATGTATCAAGGTTTTAAAGGCGTCCAACTTTCTCAAACCGCTTTAGTTGCTGCAATT 
               
               
                   
                   
                 CGCCATGATTGTGCTGCATCAGGTATTCATACCCTCGCCACAGAACAATACAATCAAGATATT 
               
               
                   
                   
                 GTCAGTTTAGGTCTGCATGCCGCTCAAGATGTTTTAGAGATGGAGCAGAAATTACGCAATATT 
               
               
                   
                   
                 GTTTCAATGACAATTCTGGTAGTTTGTCAGGCCATTCATCTTCGCGGCAATATTAGTGAAATT 
               
               
                   
                   
                 GCGCCTGAAACTGCTAAATTTTACCATGCAGTACGCGAAATCAGTTCTCCTTTGATCACTGAT 
               
               
                   
                   
                 CGTGCGTTGGATGAAGATATAATCCGCATTGCGGATGCAATTATTAATGATCAACTTCCTCTG 
               
               
                   
                   
                 CCAGAAATCATGCTGGAAGAATAA 
               
               
                   
               
               
                 102 
                 
                   Legionella 
                 
                 ATGGAGTTTAGTAGCCGGTATGTCGCACATGTCCCTGATGCTCAGGGTTTAGTCGATTATTCG 
               
               
                   
                 
                   pneumophila 
                 
                 GCACAAGAAAATAGAATTTGGAATATTTTATTTGAGAGGCAACTCAAGTTATTGCCAGGAAGA 
               
               
                   
                 phhA 
                 GCTTGTGATGAATTTCTGTCTGGATTACAGACTTTAGGACTTAACTCCTCGACTATTCCACAA 
               
               
                   
                   
                 CTTCCAGAAGTAAGTGAGCGATTAAAGGCCAAAACGGGATGGCAAGTAGCGCCAGTTGCTGCT 
               
               
                   
                   
                 TTAATTTCAGCCAGGGAATTTTTTGAATTATTAGCAGAAAAATATTTTCCTGCGGCGACTTTT 
               
               
                   
                   
                 ATTCGAAGTGAAGAAGAATTGGATTATGTTCAAGAACCTGATATTTTTCATGAGCTTTTTGGT 
               
               
                   
                   
                 CATTGTCCTATGTTAACCGATAGAGTCTATGCTGAATTTGTCCATGATTACGCATGTAAGGTA 
               
               
                   
                   
                 TTAACTTTTCCTGAACAGGATTGGCCTTTATTGCAAAGAATGTTTTGGTTTACTGTAGAGTTT 
               
               
                   
                   
                 GGATTGATTAAAACGCCTAAAGGGCTTAGAGCATACGGCGGGGGAATTTTATCTTCTATCAGT 
               
               
                   
                   
                 GAAACGGTATATTGTGTGGAAAGTGATATTCCTGTGCGAATTTTATTTGATCCAGTGGTGGCT 
               
               
                   
                   
                 TTTCGAATGCCTTATCGGATTGACCAGCTACAACCTGTTTATTTCGTTATTGACAGCTATCAA 
               
               
                   
                   
                 AATTTATATGATTTCGTGCTTTCTGACATGGGTAAATTCATGGATCGTGCGCGAGAGTTAGGT 
               
               
                   
                   
                 GAATTTCCACCGTATTTTGATGTGGATCCGGATAATCCAAATATTCATATAAGGGCTTGTTAA 
               
               
                   
               
               
                 103 
                 
                   Escherichia 
                 
                 GTGATCGAAATCTTACATGAATACTGGAAACCGCTGCTGTGGACCGACGGTTATCGCTTTACT 
               
               
                   
                   coli  hisM 
                 GGTGTGGCGATCACTCTGTGGCTGCTTATTTTGTCGGTAGTGATAGGCGGAGTCCTGGCGCTG 
               
               
                   
                   
                 TTTCTGGCGATTGGTCGTGTCTCCAGTAATAAATACATCCAGTTTCCAATCTGGTTATTTACC 
               
               
                   
                   
                 TATATTTTTCGCGGTACGCCGCTGTATGTTCAGTTGCTGGTGTTCTATTCCGGCATGTACACG 
               
               
                   
                   
                 CTTGAGATTGTTAAGGGAACCGAATTCCTTAACGCTTTCTTCCGCAGTGGCCTGAACTGTACC 
               
               
                   
                   
                 GTGCTGGCGCTGACGCTTAACACCTGCGCTTACACTACCGAGATTTTTGCTGGGGCAATCCGT 
               
               
                   
                   
                 TCGGTTCCGCATGGGGAAATTGAAGCCGCCAGAGCCTATGGCTTCTCGACTTTTAAAATGTAT 
               
               
                   
                   
                 CGCTGCATTATTTTGCCTTCTGCGCTGCGTATTGCGTTACCGGCATACAGCAACGAAGTGATC 
               
               
                   
                   
                 CTGATGCTGCACTCTACTGCGTTGGCATTTACTGCCACGGTGCCGGATCTGCTGAAAATAGCC 
               
               
                   
                   
                 CGCGATATTAACGCCGCCACGTATCAACCTTTTACCGCCTTCGGCATTGCCGCGGTGCTCTAT 
               
               
                   
                   
                 TTAATCATCTCTTATGTCCTGATCAGCCTCTTTCGCAGAGCGGAAAAACGCTGGTTGCAGCAT 
               
               
                   
                   
                 GTGAAACCTTCTTCAACGCACTGA 
               
               
                   
               
               
                 104 
                 clbA (wild- 
                 caaatatcacataatcttaacatatcaataaacacagtaaagtttcatgtgaaaaacatcaaa 
               
               
                   
                 type) 
                 cataaaatacaagctcggaatacgaatcacgctatacacattgctaacaggaatgagattatc 
               
               
                   
                   
                 taaatgaggattgatatattaattggacatactagtttttttcatcaaaccagtagagataac 
               
               
                   
                   
                 ttccttcactatctcaatgaggaagaaataaaacgctatgatcagtttcattttgtgagtgat 
               
               
                   
                   
                 aaagaactctatattttaagccgtatcctgctcaaaacagcactaaaaagatatcaacctgat 
               
               
                   
                   
                 gtctcattacaatcatggcaatttagtacgtgcaaatatggcaaaccatttatagtttttcct 
               
               
                   
                   
                 cagttggcaaaaaagattttttttaacctttcccatactatagatacagtagccgttgctatt 
               
               
                   
                   
                 agttctcactgcgagcttggtgtcgatattgaacaaataagagatttagacaactcttatctg 
               
               
                   
                   
                 aatatcagtcagcatttttttactccacaggaagctactaacatagtttcacttcctcgttat 
               
               
                   
                   
                 gaaggtcaattacttttttggaaaatgtggacgctcaaagaagcttacatcaaatatcgaggt 
               
               
                   
                   
                 aaaggcctatctttaggactggattgtattgaatttcatttaacaaataaaaaactaacttca 
               
               
                   
                   
                 aaatatagaggttcacctgtttatttctctcaatggaaaatatgtaactcatttctcgcatta 
               
               
                   
                   
                 gcctctccactcatcacccctaaaataactattgagctatttcctatgcagtcccaactttat 
               
               
                   
                   
                 caccacgactatcagctaattcattcgtcaaatgggcagaattgaatcgccacggataatcta 
               
               
                   
                   
                 gacacttctgagccgtcgataatattgattttcatattccgtcggtggtgtaagtatcccgca 
               
               
                   
                   
                 taatcgtgccattcacatttag 
               
               
                   
               
               
                 105 
                 clbA knock- 
                 ggatggggggaaacatggataagttcaaagaaaaaaacccgttatctctgcgtgaaagacaag 
               
               
                   
                 out 
                 tattgcgcatgctggcacaaggtgatgagtactctcaaatatcacataatcttaacatatcaa 
               
               
                   
                   
                 taaacacagtaaagtttcatgtgaaaaacatcaaacataaaatacaagctcggaatacgaatc 
               
               
                   
                   
                 acgctatacacattgctaacaggaatgagattatctaaatgaggattgaTGTGTAGGCTGGAG 
               
               
                   
                   
                 CTGCTTCGAAGTTCCTATACTTTCTAGAGAATAGGAACTTCGGAATAGGAACTTCGGAATAGG 
               
               
                   
                   
                 AACTAAGGAGGATATTCATATGtcgtcaaatgggcagaattgaatcgccacggataatctaga 
               
               
                   
                   
                 cacttctgagccgtcgataatattgattttcatattccgtcggtgg 
               
               
                   
               
               
                 106 
                 Prp 
                 
                   TTACCCGTCTGGATTTTCAGTACGCGCTTTTAAACGACGCCACAGCGTGGTACGGCTGATCCC 
                 
               
               
                   
                 promoter 
                 
                   CAAATAACGTGCGGCGGCGCGCTTATCGCCATTAAAGCGTGCGAGCACCTCCTGCAATGGAAG 
                 
               
               
                   
                 (prpR 
                 
                   CGCTTCTGCTGACGAGGGCGTGATTTCTGCTGTGGTCCCCACCAGTTCAGGTAATAATTGCCG 
                 
               
               
                   
                 sequence - 
                 
                   CATAAATTGTCTGTCCAGTGTTGGTGCGGGATCGACGCTTAAAAAAAGCGCCAGGCGTTCCAT 
                 
               
               
                   
                 underlined; 
                 
                   CATATTCCGCAGTTCGCGAATATTACCGGGCCAATGATAGTTCAGTAGAAGCGGCTGACACTG 
                 
               
               
                   
                 Ribosome 
                 
                   CGTCAGCCCATGACGCACCGATTCGGTAAAAGGGATCTCCATCGCGGCCAGCGATTGTTTTAA 
                 
               
               
                   
                 binding 
                 
                   AAAGTTTTCCGCCAGAGGCAGAATATCAGGCTGTCGCTCGCGCAAGGGGGGAAGCGGCAGACG 
                 
               
               
                   
                 site - 
                 
                   CAGAATGCTCAAACGGTAAAACAGATCGGTACGAAAACGTCCTTGCGTTATCTCCCGATCCAG 
                 
               
               
                   
                 lower case; 
                 
                   ATCGCAATGCGTGGCGCTGATCACCCGGACATCTACCGGGATCGGCTGATGCCCGCCAACGCG 
                 
               
               
                   
                 start codon 
                 
                   GGTGACGGCTTTTTCCTCCAGTACGCGTAGAAGGCGGGTTTGTAACGGCAGCGGCATTTCGCC 
                 
               
               
                   
                 of gene of 
                 
                   AATTTCGTCAAGAAACAGCGTGCCGCCGTGGGCGACCTCAAACAGCCCCGCACGTCCACCTCG 
                 
               
               
                   
                 interest 
                 
                   TCTTGAGCCGGTAAACGCTCCCTCCTCATAGCCAAACAGTTCAGCCTCCAGCAACGACTCGGT 
                 
               
               
                   
                 (italicized 
                 
                   AATCGCGCCGCAATTAACGGCGACAAAGGGCGGAGAAGGCTTGTTCTGACGGTGGGGCTGACG 
                 
               
               
                   
                 atg) 
                 
                   GTTAAACAACGCCTGATGAATCGCTTGCGCCGCCAGCTCTTTCCCGGTCCCTGTTTCCCCCTG 
                 
               
               
                   
                   
                 
                   AATCAGCACTGCCGCGCGGGAACGGGCATAGAGTGTAATCGTATGGCGAACCTGCTCCATTTG 
                 
               
               
                   
                   
                 
                   TGGTGAATCGCCGAGGATATCGCTCAGCGCATAACGGGTCTGTAATCCCTTGCTGGAGGTATG 
                 
               
               
                   
                   
                 
                   CTGGCTATACTGACGCCGTGTCAGGCGGGTCATATCCAGCGCATCATGGAAAGCCTGACGTAC 
                 
               
               
                   
                   
                 
                   GGTGGCCGCTGAATAAATAAAGATGGCGGTCATTCCTGCCTCTTCCGCCAGGTCGGTAATTAG 
                 
               
               
                   
                   
                 
                   TCCTGCCCCAATTACAGCCTCAATGCCGTTAGCTTTGAGCTCGTTAATTTGCCCGCGAGCATC 
                 
               
               
                   
                   
                 
                   CTCTTCAGTGATATAGCTTCGCTGTTCAAGACGGAGGTGAAACGTTTTCTGAAAGGCGACCAG 
                 
               
               
                   
                   
                 
                   AGCCGGAATGGTCTCCTGATAGGTCACGATTCCCATTGAGGAAGTCAGCTTTCCCGCTTTTGC 
                 
               
               
                   
                   
                 
                   CAGAGCCTGTAATACATCGAATCCGCTGGGTTTGATGAGGATGACAGGTACCGACAGTCGGCT 
                 
               
               
                   
                   
                 
                   TTTTAAATAAGCGCCGTTGGAACCTGCCGCGATAATCGCGTCGCAGCGTTCGGTTGCCAGTTT 
                 
               
               
                   
                   
                 
                   TTTGCGAATGTAGGCTACTGCCTTTTCAAAACCGAGCTGAATAGGCGTGATCGTCGCCAGATG 
                 
               
               
                   
                   
                 
                   ATCAAACTCCAGGCTGATATCCCGAAATAGTTCGAACAGGCGCGTTACCGAGACCGTCCAGAT 
                 
               
               
                   
                   
                   CACCGGTTTATCGCTATTATCGCGCGAAGCGCTATGCACAGTAACCAT CGTCGTAGATTCATG 
               
               
                   
                   
                 TTTAAGGAACGAATTCTTGTTTTATAGATGTTTCGTTAATGTTGCAATGAAACACAGGCCTCC 
               
               
                   
                   
                 GTTTCATGAAACGTTAGCTGACTCGTTTTTCTTGTGACTCGTCTGTCAGTATTAAAAAAGATT 
               
               
                   
                   
                 TTTCATTTAACTGATTGTTTTTAAATTGAATTTTATTTAATGGTTTCTCGGTTTTTGGGTCTG 
               
               
                   
                   
                 GCATATCCCTTGCTTTAATGAGTGCATCTTAATTAACAATTCAATAACAAGAGGGCTGAATag 
               
               
                   
                   
                 taatttcaacaaaataacgagcattcga atg   
               
               
                   
               
               
                 107 
                 Tsx - 
                 Atgaaaaaaactttactcgcagtcagcgcagcgctggcgctcacctcatcttttactgctaac 
               
               
                   
                 
                   Salmonella 
                 
                 gcagcagaaaatgatcagccgcagtatttgtccgactggtggcaccagagcgtaaacgtggta 
               
               
                   
                 
                   enterica 
                 
                 ggcagctaccatacccgtttctcgccgaaattgaacaacgacgtctatctggaatatgaagca 
               
               
                   
                 subsp. 
                 tttgccaaaaaagactggtttgatttctacggctatatcgatattcccaaaacctttgattgg 
               
               
                   
                 
                   enterica 
                 
                 ggtaacggcaacgataaaggtatctggtccgacggttctccgctgttcatggaaatcgaaccg 
               
               
                   
                 
                   serovar 
                 
                 cgtttctcaattgataagctgaccggcgcagacctgagcttcggcccgtttaaagagtggtat 
               
               
                   
                 
                   Typhimurium 
                 
                 ttcgccaacaactacatctacgatatgggcgataacaaagccagccgccagagcacgtggtat 
               
               
                   
                 LT2 
                 atgggtctggggaccgatatcgacaccggcctgccgatgggtctgtcgctgaacgtgtatgcg 
               
               
                   
                 (STM0413) 
                 aaatatcagtggcaaaactacggcgcgtccaatgaaaacgaatgggacggctaccgtttcaaa 
               
               
                   
                   
                 gtgaaatacttcgtccccatcaccgatctgtggggcggtaaactgagctatatcggctttacc 
               
               
                   
                   
                 aactttgactggggatctgatttaggcgacgatccgaaccgtaccagcaactccatcgcttcc 
               
               
                   
                   
                 agccatatcctggcgctgaactacgatcactggcactactcggtcgttgcgcgttacttccat 
               
               
                   
                   
                 aacggcggacagtggcagaatggcgcaaaactgaactggggcgacggcgatttcagcgcgaaa 
               
               
                   
                   
                 tctaccggctggggcggctacctggtcgtgggttacaacttctaa 
               
               
                   
               
               
                 136 
                 Tsx - 
                 MKKTLLAVSAALALTSSFTANAAENDQPQYLSDWWHQSVNVVGSYHTRFSPKLNNDVYLEYEA 
               
               
                   
                 
                   Salmonella 
                 
                 FAKKDWFDFYGYIDIPKTFDWGNGNDKGIWSDGSPLFMEIEPRFSIDKLTGADLSFGPFKEWY 
               
               
                   
                 
                   enterica 
                 
                 FANNYIYDMGDNKASRQSTWYMGLGTDIDTGLPMGLSLNVYAKYQWQNYGASNENEWDGYRFK 
               
               
                   
                 subsp. 
                 VKYFVPITDLWGGKLSYIGFTNFDWGSDLGDDPNRTSNSIASSHILALNYDHWHYSVVARYFH 
               
               
                   
                 
                   enterica 
                 
                 NGGQWQNGAKLNWGDGDFSAKSTGWGGYLVVGYNF 
               
               
                   
                 
                   Serovar 
                 
                   
               
               
                   
                 
                   Typhimurium 
                 
                   
               
               
                   
                 LT2 
                   
               
               
                   
                 (STM0413) 
                   
               
               
                   
               
               
                 108 
                 Tsx - 
                 atgaaaaaaacattactggcagccggtgcggtactggcgctctcttcgtcttttactgtc 
               
               
                   
                 
                   Escherichia 
                 
                 aacgcagctgaaaacgacaaaccgcagtatctttccgactggtggcaccagagcgttaac 
               
               
                   
                   coli  K-12 
                 gttgtcggaagctatcacacccgtttcggaccgcagatccgcaacgatacctaccttgag 
               
               
                   
                 MG1655 
                 tacgaagcattcgctaaaaaagactggttcgacttctatggttatgcggatgcgccggta 
               
               
                   
                 (b0411) 
                 ttcttcggcggtaactccgatgctaaaggtatctggaaccacggttctccgctgtttatg 
               
               
                   
                   
                 gaaatcgaaccacgtttctccatcgacaagctgaccaatactgaccttagcttcggtccg 
               
               
                   
                   
                 ttcaaagagtggtacttcgcgaacaactacatttacgacatgggtcgtaataaagatggt 
               
               
                   
                   
                 cgccagagcacctggtacatgggtctgggtaccgatatcgacactggcctgccgatgagc 
               
               
                   
                   
                 ctgtccatgaacgtctatgcgaaataccagtggcagaactatggcgcagcgaacgaaaac 
               
               
                   
                   
                 gagtgggacggttaccgtttcaaaattaaatactttgtgccgattaccgatctgtggggc 
               
               
                   
                   
                 ggtcagctgagctacatcggcttcaccaacttcgactggggttccgatttaggggatgac 
               
               
                   
                   
                 agcggtaacgcaatcaacggtattaagacccgtactaataactctatcgcttccagccat 
               
               
                   
                   
                 attctggctctgaactacgatcactggcactactctgtcgtagctcgttactggcacgac 
               
               
                   
                   
                 ggtggtcagtggaacgacgatgcagaactgaacttcggcaacggcaacttcaacgttcgc 
               
               
                   
                   
                 tctaccggctggggtggttacctggtagtaggttacaacttctga 
               
               
                   
               
               
                 109 
                 BH1446 - 
                 atgaatattttgtggggtttattaggaatcgtcgttgtttttctaatcgcttttgcattttcc 
               
               
                   
                 
                   Bacillus 
                 
                 acaaatcgtcgtgcaattaaaccacgaacgatattaggtggtctcgcgattcagctattattt 
               
               
                   
                 
                   halodurans 
                 
                 gcgattattgtattaaaaattccagctggacaagcgttacttgagagcttaaccaatgtagtt 
               
               
                   
                 (BAB05165) 
                 ttgaacattattagttatgcgaatgaagggatcgacttcgtatttggtggatttttcgaagaa 
               
               
                   
                   
                 ggttcaggcgtaggcttcgtttttgcaattaacgttttgtctgtcgtcattttcttctcagca 
               
               
                   
                   
                 ctaatctcgatcctttattatttagggatcatgcaatttgtcattaaaattatcggtggtgcg 
               
               
                   
                   
                 ctgtcctggctactcggaacatcaaaggcagaatcaatgtcagcagcagctaacattttcgtt 
               
               
                   
                   
                 gggcaaacggaagcgccactcgttgttaagccatacttaccaaaaatgacgcaatccgagctc 
               
               
                   
                   
                 tttgcggttatgaccgggggacttgcttctgttgctggttctgttttaatcggttattctctt 
               
               
                   
                   
                 ttaggagtaccgctacaatatttattagcggcaagctttatggctgctcctgcgggcttgatt 
               
               
                   
                   
                 atggcgaaaatgatcatgcctgaaacggagaaaacaaccgatgcagaagatgactttaagctc 
               
               
                   
                   
                 gcaaaggatgaagagtccacgaacttgattgacgcggccgccaatggggcgagcactgggtta 
               
               
                   
                   
                 atgctcgttctaaatattgcggcgatgttactagcgttcgttgcattgattgcattaattaat 
               
               
                   
                   
                 ggaattcttggatggatcggaggattgtttggggcgtcgcaattgtctttagagttaatcctc 
               
               
                   
                   
                 ggatacgtgtttgctccgcttgcgtttgtcatcggaattccttgggctgaagcgcttcaagcg 
               
               
                   
                   
                 ggaagctacatcggacagaaactcgtagtgaacgaatttgttgcctacttaagctttgcacca 
               
               
                   
                   
                 gaaattgaaaacctttcagataaagcggtgatggtgattagttttgccctttgcggatttgct 
               
               
                   
                   
                 aacttctcatccctcggaatccttttaggaggattgggtaagcttgctccgagccgtcgccct 
               
               
                   
                   
                 gatattgcccgtctcggattacgcgcgatccttgcaggtacgctagcttctttactcagcgcc 
               
               
                   
                   
                 tccattgcgggaatgttattctaa 
               
               
                   
               
               
                 137 
                 BH1446 - 
                 MNILWGLLGIVVVFLIAFAFSTNRRAIKPRTILGGLAIQLLFAIIVLKIPAGQALLESLTNVV 
               
               
                   
                 
                   Bacillus 
                 
                 LNIISYANEGIDFVFGGFFEEGSGVGFVFAINVLSVVIFFSALISILYYLGIMQFVIKIIGGA 
               
               
                   
                 
                   halodurans 
                 
                 LSWLLGTSKAESMSAAANIFVGQTEAPLVVKPYLPKMTQSELFAVMTGGLASVAGSVLIGYSL 
               
               
                   
                 (BAB05165) 
                 LGVPLQYLLAASFMAAPAGLIMAKMIMPETEKTTDAEDDFKLAKDEESTNLIDAAANGASTGL 
               
               
                   
                   
                 MLVLNIAAMLLAFVALIALINGILGWIGGLFGASQLSLELILGYVFAPLAFVIGIPWAEALQA 
               
               
                   
                   
                 GSYIGQKLVVNEFVAYLSFAPEIENLSDKAVMVISFALCGFANFSSLGILLGGLGKLAPSRRP 
               
               
                   
                   
                 DIARLGLRAILAGTLASLLSASIAGMLF 
               
               
                   
               
               
                 110 
                 nupC - 
                 atgaagtatttgattgggattatcggtttaatcgtgtttttaggcctcgcgtggatcgcgagc 
               
               
                   
                 
                   Bacillus 
                 
                 agcggcaaaaaaagaattaagatccgcccaattgttgttatgctcattttgcaatttattctt 
               
               
                   
                 
                   subtilis 
                 
                 ggctacattctcctcaataccggaatagggaatttcctcgtgggaggatttgcaaaaggattc 
               
               
                   
                 subsp. 
                 ggttacctgcttgaatacgcggcagagggaattaactttgtgtttggcggcttggtgaatgcg 
               
               
                   
                 
                   subtilis 
                 
                 gaccaaacgacattctttatgaatgttctcttgccaatcgtgtttatttccgctctgatcggg 
               
               
                   
                 168 
                 attctgcaaaagtggaaagtcctcccgtttatcattagatatatcggccttgccctcagcaag 
               
               
                   
                 (BSU39410; 
                 gtaaacggtatgggaagattggaatcgtataacgcagtggcttctgcgattttagggcagtca 
               
               
                   
                 CAA57663) 
                 gaagtatttatctccttgaagaaagaactcggtcttttaaatcagcagcgcttgtacacgctt 
               
               
                   
                   
                 tgcgcatctgcgatgtcaactgtatcaatgtcgattgtcggtgcgtatatgacaatgctgaaa 
               
               
                   
                   
                 ccggaatatgttgtaacagcgcttgttttgaacttatttggcggtttcattatcgcttctatt 
               
               
                   
                   
                 atcaatccgtacgaggttgcaaaagaagaggatatgcttcgtgttgaggaagaagaaaaacaa 
               
               
                   
                   
                 tccttcttcgaagtgctcggagaatacattcttgacggtttcaaagtagcggttgtcgtcgct 
               
               
                   
                   
                 gcgatgctgattggatttgtcgcgattattgcattgatcaatggcatttttaatgcagtattc 
               
               
                   
                   
                 ggtatttcgttccaaggcattcttggatatgtgtttgctccattcgcttttcttgtcggtatc 
               
               
                   
                   
                 ccatggaatgaagctgttaatgcgggaagcattatggcaacaaaaatggtatcgaatgaattt 
               
               
                   
                   
                 gtcgccatgacgtcgcttacgcaaaacggtttccatttcagcggccgtacaacagcgatcgta 
               
               
                   
                   
                 tcggtattccttgtgtcatttgcgaacttctcctcaatcggaatcattgccggtgccgtaaaa 
               
               
                   
                   
                 ggactgaatgaaaagcaaggaaatgtcgtcgctcgtttcggcttgaaattattatacggtgct 
               
               
                   
                   
                 acgcttgtcagctttttatcagcagcaattgtgggcttgatttactga 
               
               
                   
               
               
                 138 
                   
                 MKYLIGIIGLIVFLGLAWIASSGKKRIKIRPIVVMLILQFILGYILLNTGIGNFLVGGFAKGF 
               
               
                   
                   
                 GYLLEYAAEGINFVFGGLVNADQTTFFMNVLLPIVFISALIGILQKWKVLPFIIRYIGLALSK 
               
               
                   
                   
                 VNGMGRLESYNAVASAILGQSEVFISLKKELGLLNQQRLYTLCASAMSTVSMSIVGAYMTMLK 
               
               
                   
                   
                 PEYVVTALVLNLFGGFIIASIINPYEVAKEEDMLRVEEEEKQSFFEVLGEYILDGFKVAVVVA 
               
               
                   
                   
                 AMLIGFVAIIALINGIFNAVFGISFQGILGYVFAPFAFLVGIPWNEAVNAGSIMATKMVSNEF 
               
               
                   
                   
                 VAMTSLTQNGFHFSGRTTAIVSVFLVSFANFSSIGIIAGAVKGLNEKQGNVVARFGLKLLYGA 
               
               
                   
                   
                 TLVSFLSAAIVGLIY 
               
               
                   
               
               
                 111 
                 yutK - 
                 atgaatgttctgtgggggctgctgggcgcagttgcgatcattgctatcgcgtttttattttca 
               
               
                   
                 
                   Bacillus 
                 
                 gaaaagaaaagcaatattaagataagaaccgtcatcgttggtttatgcacacaggtggcgttt 
               
               
                   
                 
                   subtilis 
                 
                 ggatacatcgtgttgaaatgggaagcgggacgcgctgtttttttatggttttcaagccgtgta 
               
               
                   
                 subsp. 
                 cagcttctgattgactatgcgaatgaaggcatcagttttatttttggaccgcttctaaaggtc 
               
               
                   
                 
                   subtilis 
                 
                 ggagacagtccggcatttgcattaagtgtactgcccgttatcattttcttctcagcactgatt 
               
               
                   
                 168: 
                 gcagttttatatcatttgaaaatcatgcagctcgttttccgtgtcattggcggcggattgtcg 
               
               
                   
                 BSU32180 
                 aagctccttggaacaagcaaaacggaatctctggcggctgctgccaatatttttgtaggacaa 
               
               
                   
                   
                 tcagaatctccgttagtgatcaaacccctgattgccgggctgacgcgctctgagttgtttacg 
               
               
                   
                   
                 attatgacgagcggtctatcggcagttgcgggatctaccttgtttgggtacgcgcttctcggt 
               
               
                   
                   
                 attccgattgagtacttgctggcggccagctttatggctgctccagctggactagtctttggt 
               
               
                   
                   
                 aaattgattatacccgaaacggaaaaaacgcaaaccgtaaaaagcgatttcaaaatggatgaa 
               
               
                   
                   
                 ggcgaaggcgcagccaatgtcattgacgcagctgcaaagggagcgtcaacaggactgcaaatt 
               
               
                   
                   
                 gcgttaaatgttggggcgatgctgcttgcgtttgttgcgttaatcgctgtagtaaacggtatt 
               
               
                   
                   
                 ctcggcggggctttcggcttgttcggtttaaaaggcgtaacattagaatccattctcggctat 
               
               
                   
                   
                 gtgttttctcctatcgcctttttgattggcgtgccttggcatgaagcattgcaggcgggaagc 
               
               
                   
                   
                 tatatcggccagaaattggtgctgaatgagtttgtcgcttattctaacttcggttcgcacatc 
               
               
                   
                   
                 ggcgagttttctaagaaaactgctaccattatcagtttcgcgttatgcggattcgccaatttt 
               
               
                   
                   
                 tcatcaattgcgattatgcttggtacgcttggcggtttagcgcccagccgccgttcagatatc 
               
               
                   
                   
                 gcacgtctcggcctgaaggctgttcttgcaggaacattagccaatctgctcagcgcagccatt 
               
               
                   
                   
                 gccggcatgtttatataa 
               
               
                   
               
               
                 139 
                   
                 MNVLWGLLGAVAIIAIAFLFSEKKSNIKIRTVIVGLCTQVAFGYIVLKWEAGRAVFLWFSSRV 
               
               
                   
                   
                 QLLIDYANEGISFIFGPLLKVGDSPAFALSVLPVIIFFSALIAVLYHLKIMQLVFRVIGGGLS 
               
               
                   
                   
                 KLLGTSKTESLAAAANIFVGQSESPLVIKPLIAGLTRSELFTIMTSGLSAVAGSTLFGYALLG 
               
               
                   
                   
                 IPIEYLLAASFMAAPAGLVFGKLIIPETEKTQTVKSDFKMDEGEGAANVIDAAAKGASTGLQI 
               
               
                   
                   
                 ALNVGAMLLAFVALIAVVNGILGGAFGLFGLKGVTLESILGYVFSPIAFLIGVPWHEALQAGS 
               
               
                   
                   
                 YIGQKLVLNEFVAYSNFGSHIGEFSKKTATIISFALCGFANFSSIAIMLGTLGGLAPSRRSDI 
               
               
                   
                   
                 ARLGLKAVLAGTLANLLSAAIAGMFI 
               
               
                   
               
               
                 112 
                 yxjA - 
                 atgtactttttattaaaccttgtcggtctcattgtgattatggcagttgtgttcctatgctcc 
               
               
                   
                 
                   Bacillus 
                 
                 ccgcagaaaaagaaaatccagtggcgtccgatcattacgttaattgttctggaattgctgatt 
               
               
                   
                 
                   subtilis 
                 
                 acttggtttatgctgggaacaaaggtcgggagctgggccatcggtaaaattggtgatttcttc 
               
               
                   
                 subsp. 
                 acttggctgattgcttgcgccagtgacggtatcgcgtttgccttcccgtcagtcatggcgaat 
               
               
                   
                 
                   spizizenii 
                 
                 gaaacagtagactttttctttagtgcacttcttccaattatctttatcgtcacattctttgat 
               
               
                   
                 W23 
                 attttaacatatttcggcattttgccttggctgattgataaaatcggatgggtgatttcaaag 
               
               
                   
                 (BSUW23_193 
                 gcttcccgcttgccgaaattagaaagctttttctctattcaaatgatgttcttgggaaatact 
               
               
                   
                 55) 
                 gaagcacttgcggtcatccgccagcagcttacggtattaaataacaaccgcttgcttacattt 
               
               
                   
                   
                 ggcttaatgagcatgagcagcatcagcggctccattattggatcttacctgtcaatggtgccg 
               
               
                   
                   
                 gcgacatacgtgtttacagcgattccattgaactgcttaaacgcgctgattattgcaaacctg 
               
               
                   
                   
                 ctgaaccctgttcatgtgccggaggatgaagatatcatctatacaccgcctaaagaagagaag 
               
               
                   
                   
                 aaagactttttctctacgatttctaacagtatgcttgtcggcatgaacatggttatcgttatt 
               
               
                   
                   
                 ttggcaatggtgatcggatatgtagcattaacgtctgcagtcaatggcattcttggtgttttc 
               
               
                   
                   
                 gtacacggcctgaccatccagacaatttttgcttatctcttcagtccgttcgcattcctgctt 
               
               
                   
                   
                 ggtctgccagtacatgatgcaatgtatgtcgctcagctaatgggaatgaaattggcaacgaac 
               
               
                   
                   
                 gagtttgttgcgatgcttgacttgaaaaacaatcttacaacacttccgcctcacacagttgcg 
               
               
                   
                   
                 gtggcgacgacattcctgacgtcatttgccaacttcagtactgtcggcatgatttacggaacg 
               
               
                   
                   
                 tacaactcgatccttgacggcgaaaagtcaacggtcatcgggaaaaacgtgtggaaattgctc 
               
               
                   
                   
                 gtcagcggcattgcggtatctttactaagtgctgcgattgtcggcctgtttgtgtggtag 
               
               
                   
               
               
                 140 
                 yxjA - 
                 MYFLLNLVGLIVIMAVVFLCSPQKKKIQWRPIITLIVLELLITWFMLGTKVGSWAIGKIGDFF 
               
               
                   
                 
                   Bacillus 
                 
                 TWLIACASDGIAFAFPSVMANETVDFFFSALLPIIFIVTFFDILTYFGILPWLIDKIGWVISK 
               
               
                   
                 
                   subtilis 
                 
                 ASRLPKLESFFSIQMMFLGNTEALAVIRQQLTVLNNNRLLTFGLMSMSSISGSIIGSYLSMVP 
               
               
                   
                 subsp. 
                 ATYVFTAIPLNCLNALIIANLLNPVHVPEDEDIIYTPPKEEKKDFFSTISNSMLVGMNMVIVI 
               
               
                   
                 
                   spizizenii 
                 
                 LAMVIGYVALTSAVNGILGVFVHGLTIQTIFAYLFSPFAFLLGLPVHDAMYVAQLMGMKLATN 
               
               
                   
                 W23 
                 EFVAMLDLKNNLTTLPPHTVAVATTFLTSFANFSTVGMIYGTYNSILDGEKSTVIGKNVWKLL 
               
               
                   
                 (BSUW23_193 
                 VSGIAVSLLSAAIVGLFVW 
               
               
                   
                 55) 
                   
               
               
                   
               
               
                 113 
                 ccCNT 
                 atgttccgtcccgagaacgttcaggccctcgcgggtctggcgctcaccctgggcctgtgctgg 
               
               
                   
                 (CC2089) - 
                 ctcgtttccgagaatcgcaagcggttcccctggggcctggccatcggcgcggtcgtcattcag 
               
               
                   
                 
                   Caulobacter 
                 
                 gtcctgctggtcctggtcctgttcggcctgccgcaagcccagcagatgctgcgcggcgtcaac 
               
               
                   
                 
                   crescentus 
                 
                 ggcgcggtggagggccttgccgcctcgacccaggccggcaccgccttcgtgttcggctttctg 
               
               
                   
                 CB15 
                 gccggcggcgaccagccctatccggtcagcaatccgggcgcgggcttcatcttcgccttccgc 
               
               
                   
                 (AAK24060) 
                 gtgctgccggtgatcctggtggtctgcgccctgtcggcgctgctgtggcactggaagattctc 
               
               
                   
                   
                 aagtggctggctcagggcttcggctttgtgttccagaagacgctgggcctgcgcggcccgccg 
               
               
                   
                   
                 gccctggccaccgccgcgaccatcttcatgggtcaggtcgaggggccgatcttcatccgcgcc 
               
               
                   
                   
                 tatctcgacaagctgagccgctcggaactcttcatgctgatcgcggtcggcatggcctgcgtg 
               
               
                   
                   
                 tcgggctcgaccatggtcgcctacgccaccatcctggccgacgtcctgcccaacgccgccgcc 
               
               
                   
                   
                 cacgtgctgaccgcctcgatcatctcggctccggccggcgtgctgctggcccggatcattgtg 
               
               
                   
                   
                 ccgtccgatccgatggagaagagcgccgatcttgatctgtcgaccgaggacaagacctatggc 
               
               
                   
                   
                 agctcgatcgacgccgtgatgaagggcaccaccgacggcctgcagatcgcgctgaacgtcggc 
               
               
                   
                   
                 gccaccctgatcgtcttcgtggccctggccaccatggtcgacaaggtcctgggcgccttcccg 
               
               
                   
                   
                 ccggtgggcggcgagccgctgagcatcgcgcgcggcctgggcgtggtcttcgcgccgctggcc 
               
               
                   
                   
                 tggtcgatgggcatcccgtggaaagaagcgggcacggccggcggtctgctgggcgtgaagctg 
               
               
                   
                   
                 atcctgaccgagttcaccgccttcatccagctgtccaaggtgggcgaagccctgctggacgaa 
               
               
                   
                   
                 cgcacccggatgatcatgacctacgctctgtgcggtttcgccaatatcggctcggtcggcatg 
               
               
                   
                   
                 aacgtcgccggcttctcggtgctggtgccccagcgccggcaggaagtgctgggcctggtctgg 
               
               
                   
                   
                 aaggcgatgatggccggcttcctggccacctgcctgaccgcctcgctggtcggcctgatgccg 
               
               
                   
                   
                 cgaagcctgtttgggctgtaa 
               
               
                   
               
               
                 141 
                 ccCNT 
                 MFRPENVQALAGLALTLGLCWLVSENRKRFPWGLAIGAVVIQVLLVLVLFGLPQAQQMLRGVN 
               
               
                   
                 (CC2089)- 
                 GAVEGLAASTQAGTAFVFGFLAGGDQPYPVSNPGAGFIFAFRVLPVILVVCALSALLWHWKIL 
               
               
                   
                 
                   Caulobacter 
                 
                 KWLAQGFGFVFQKTLGLRGPPALATAATIFMGQVEGPIFIRAYLDKLSRSELFMLIAVGMACV 
               
               
                   
                 
                   crescentus 
                 
                 SGSTMVAYATILADVLPNAAAHVLTASIISAPAGVLLARIIVPSDPMEKSADLDLSTEDKTYG 
               
               
                   
                 CB15 
                 SSIDAVMKGTTDGLQIALNVGATLIVFVALATMVDKVLGAFPPVGGEPLSIARGLGVVFAPLA 
               
               
                   
                 (AAK24060) 
                 WSMGIPWKEAGTAGGLLGVKLILTEFTAFIQLSKVGEALLDERTRMIMTYALCGFANIGSVGM 
               
               
                   
                   
                 NVAGFSVLVPQRRQEVLGLVWKAMMAGFLATCLTASLVGLMPRSLFGL 
               
               
                   
               
               
                 114 
                 yeiJ - 
                 atggatgtcatgagaagtgttctgggaatggtggtattgctgacgattgcgtttttactgtca 
               
               
                   
                 
                   Escherichia 
                 
                 gtaaacaagaagaagatcagcctgcgtaccgttggcgcggcgttagtgttacaggtcgtgatt 
               
               
                   
                   coli  K-12 
                 ggcggcattatgctttggttaccgccagggcgttgggtcgctgaaaaagtcgcttttggcgtg 
               
               
                   
                 W3110 
                 cataaagtgatggcgtacagcgacgcgggtagcgcatttatcttcggttctctggtcggaccg 
               
               
                   
                 (AAC75222; 
                 aaaatggataccttatttgatggtgcaggatttatctttggtttcagggtgttaccggcaatt 
               
               
                   
                 JW2148) 
                 atcttcgtcaccgcgctggtgagtattctctactacatcggtgtgatggggattttaattcga 
               
               
                   
                   
                 attctcggcggtatcttccagaaagcattaaatatcagcaagatcgagtcattcgtcgcggtc 
               
               
                   
                   
                 accaccattttcctcgggcaaaacgaaattccggcaatcgtcaaaccctttatcgatcgtctg 
               
               
                   
                   
                 aatcgcaatgaattatttacagcgatttgtagtggcatggcctcgattgctggttcgacaatg 
               
               
                   
                   
                 attggttacgccgcactgggcgtgcctgtggaatatctgctggcggcatcattaatggcgatc 
               
               
                   
                   
                 cctggcgggatcttgtttgcccgcctgttaagcccggcaacggaatcttcgcaggtttccttt 
               
               
                   
                   
                 aataacctctctttcaccgaaacaccgccaaaaagcattattgaagccgctgcgacaggggca 
               
               
                   
                   
                 atgaccgggctgaaaatcgccgcaggtgtggcaacagtggtgatggcatttgttgcaataatt 
               
               
                   
                   
                 gcgttgattaacggtattatcggcggcgttggtggctggtttggttttgaacatgcctcgctg 
               
               
                   
                   
                 gagtccattttaggttacctgctggctccactggcgtgggtgatgggtgtggactggagtgat 
               
               
                   
                   
                 gcgaatcttgccgggagtttgattggacagaaactggcaataaatgaatttgtcgcttatctc 
               
               
                   
                   
                 aatttctcaccctatctgcaaacggctggcactctcgatgctaaaactgtggcgattatttcc 
               
               
                   
                   
                 ttcgcgttgtgcggtttcgctaactttggttctatcggggtggtggtgggggcgttttctgcg 
               
               
                   
                   
                 gttgcgccacaccgtgcgccggaaatcgcccagcttggtttacgggcgctggcggcggcgacg 
               
               
                   
                   
                 ctttccaacttgatgagtgcgaccattgccgggttctttattggtttagcttga 
               
               
                   
               
               
                 142 
                 yeiJ - 
                 MDVMRSVLGMVVLLTIAFLLSVNKKKISLRTVGAALVLQVVIGGIMLWLPPGRWVAEKVAFGV 
               
               
                   
                 
                   Escherichia 
                 
                 HKVMAYSDAGSAFIFGSLVGPKMDTLFDGAGFIFGFRVLPAIIFVTALVSILYYIGVMGILIR 
               
               
                   
                   coli  K-12 
                 ILGGIFQKALNISKIESFVAVTTIFLGQNEIPAIVKPFIDRLNRNELFTAICSGMASIAGSTM 
               
               
                   
                 W3110 
                 IGYAALGVPVEYLLAASLMAIPGGILFARLLSPATESSQVSFNNLSFTETPPKSIIEAAATGA 
               
               
                   
                 (AAC75222; 
                 MTGLKIAAGVATVVMAFVAIIALINGIIGGVGGWFGFEHASLESILGYLLAPLAWVMGVDWSD 
               
               
                   
                 JW2148) 
                 ANLAGSLIGQKLAINEFVAYLNFSPYLQTAGTLDAKTVAIISFALCGFANFGSIGVVVGAFSA 
               
               
                   
                   
                 VAPHRAPEIAQLGLRALAAATLSNLMSATIAGFFIGLA 
               
               
                   
               
               
                 115 
                 yeiM - 
                 atggatataatgagaagtgttgtggggatggtggtgttactggcaatagcatttctgttgtca 
               
               
                   
                 
                   Escherichia 
                 
                 gtgaataaaaagagcatcagtttgcgcacggttggagccgcactgctgctgcaaatcgctatt 
               
               
                   
                   coli  K-12 
                 ggtggcatcatgctctacttcccaccgggaaaatgggcagtagaacaggcggcattaggcgtt 
               
               
                   
                 W3110 
                 cataaagtgatgtcttacagtgatgccggtagcgccttcatttttggttcgctggttgggccg 
               
               
                   
                 (AAC75225; 
                 aaaatggatgtcctgtttgacggtgcgggttttatcttcgcctttcgcgtacttccggcgatt 
               
               
                   
                 JW2151) 
                 attttcgttactgcgctcatcagtctgctgtactacattggcgtgatggggctgctgattcgc 
               
               
                   
                   
                 atccttggcagcattttccagaaagccctcaacatcagcaaaatcgaatcttttgttgcggtt 
               
               
                   
                   
                 actactattttcctcgggcaaaatgagatcccggcgatcgttaaaccgtttatcgatcgcatg 
               
               
                   
                   
                 aatcgcaacgagttgtttaccgcaatttgtagcgggatggcgtccattgctggttcgatgatg 
               
               
                   
                   
                 attggttatgccggaatgggcgtaccaattgactacctgttagcggcatcgctgatggcgatc 
               
               
                   
                   
                 cctggcgggattttgtttgcacgtattcttagcccggcaaccgagccttcgcaggtcacattt 
               
               
                   
                   
                 gaaaatctgtcgttcagcgaaacgccgccaaaaagctttatcgaagcggcggcgagcggtgcg 
               
               
                   
                   
                 atgaccgggctaaaaatcgccgctggtgtggcgacggtggtaatggcgtttgtcgcaattatt 
               
               
                   
                   
                 gcgctgatcaacggcattatcggcggaattggcggctggtttggtttcgccaatgcctctctg 
               
               
                   
                   
                 gaaagtatttttggctatgtgctggcaccgctggcgtggatcatgggtgtggactggagtgat 
               
               
                   
                   
                 gccaatcttgcgggtagcctgattgggcagaaactggcgattaacgaattcgtcgcttacctg 
               
               
                   
                   
                 agtttctccccatacctgcaaacgggcggcacgctggaagtgaaaaccattgcgattatctcc 
               
               
                   
                   
                 tttgcgctttgtggttttgctaactttggttctatcggtgttgtcgttggcgcattttcggct 
               
               
                   
                   
                 atttcgccaaaacgcgcgccggaaatcgcccagcttggtttacgggcgctggcagcagcaacg 
               
               
                   
                   
                 ctttccaacctgatgagtgcgactattgccgggttctttattggtctggcgtaa 
               
               
                   
               
               
                 143 
                 yeiM - 
                 MDIMRSVVGMVVLLAIAFLLSVNKKSISLRTVGAALLLQIAIGGIMLYFPPGKWAVEQAALGV 
               
               
                   
                 
                   Escherichia 
                 
                 HKVMSYSDAGSAFIFGSLVGPKMDVLFDGAGFIFAFRVLPAIIFVTALISLLYYIGVMGLLIR 
               
               
                   
                   coli  K-12 
                 ILGSIFQKALNISKIESEVAVTTIFLGQNEIPAIVKPFIDRMNRNELFTAICSGMASIAGSMM 
               
               
                   
                 W3110 
                 IGYAGMGVPIDYLLAASLMAIPGGILFARILSPATEPSQVTFENLSFSETPPKSFIEAAASGA 
               
               
                   
                 (AAC75225; 
                 MTGLKIAAGVATVVMAFVAIIALINGIIGGIGGWFGFANASLESIFGYVLAPLAWIMGVDWSD 
               
               
                   
                 JW2151) 
                 ANLAGSLIGQKLAINEFVAYLSFSPYLQTGGTLEVKTIAIISFALCGFANFGSIGVVVGAFSA 
               
               
                   
                   
                 ISPKRAPEIAQLGLRALAAATLSNLMSATIAGFFIGLA 
               
               
                   
               
               
                 116 
                 H10519 - 
                 atgagtgtgttaagcagcattttgggaatggtcgtattaatcgctattgccgtgttactttct 
               
               
                   
                 
                   Haemophilus 
                 
                 aataatcgtaaagcgattagtattcgaaccgtagtaggggcgttagcaatccaagtaggattt 
               
               
                   
                 
                   influenzae 
                 
                 gccgcccttattttatatgtgccagcaggtaaacaagcgttgggtgccgctgcggatatggta 
               
               
                   
                 Rd KW20 
                 tccaatgttattgcctatggtaatgacgggattaatttcgttttcggcggattggcagatcca 
               
               
                   
                 serotype 
                 agtaaaccatccggtttcatttttgcagtgaaagtattaccgattatcgtgttcttctctggc 
               
               
                   
                 d(AAC22177 
                 ttaatttctgtgctttactatctcggcattatgcaagtcgtgattaaagtattaggtggcgca 
               
               
                   
                   
                 ttacaaaaagcattgggtacgtcaaaagcggaatcaatgtcagcggcggcgaatatcttcgtc 
               
               
                   
                   
                 ggtcaaactgaagcaccattagttgttcgcccttacattaaaaatatgacccaatctgaatta 
               
               
                   
                   
                 tttgccattatggtgggtggtacagcgtctatcgcgggttcagtaatggcaggttatgctgga 
               
               
                   
                   
                 atgggcgtgccattgacatacttaatcgctgcgtcatttatggcggcaccagcaggtttatta 
               
               
                   
                   
                 tttgcgaaattaatgttcccacaaaccgaacaattcacagataaacaaccagaagacaatgat 
               
               
                   
                   
                 tcagaaaaaccaactaacgtacttgaagcaatggcgggcggtgcgagtgcaggtatgcaactt 
               
               
                   
                   
                 gcgttaaacgtaggtgcaatgttaatcgcattcgttggtttaattgcattaattaatggtatt 
               
               
                   
                   
                 ttaagtggcgtaggcggatggttcggctatggcgacttaaccttacaatctatctttggttta 
               
               
                   
                   
                 atttttaaaccattagcatacttaatcggtgtaactgatggtgctgaagcaggtattgcagga 
               
               
                   
                   
                 caaatgatcgggatgaaattagcggttaatgaatttgtgggttatcttgaatttgcaaaatat 
               
               
                   
                   
                 ttacaaccagattctgcaattgtattaactgaaaaaaccaaagcgattattactttcgcactt 
               
               
                   
                   
                 tgtggttttgctaacttcagctcaattgcaatcttaattggtggtttaggtggtatggcacca 
               
               
                   
                   
                 agccgtcgtagtgatgttgctcgtttaggtatcaaagccgttatcgctggtactctcgctaac 
               
               
                   
                   
                 ttaatgagtgcaactattgctggtttatttatcggcttaggtgctgcagcactttaa 
               
               
                   
               
               
                 144 
                 HI0519 - 
                 MSVLSSILGMVVLIAIAVLLSNNRKAISIRTVVGALAIQVGFAALILYVPAGKQALGAAADMV 
               
               
                   
                 
                   Haemophilus 
                 
                 SNVIAYGNDGINFVFGGLADPSKPSGFIFAVKVLPIIVFFSGLISVLYYLGIMQVVIKVLGGA 
               
               
                   
                 
                   influenzae 
                 
                 LQKALGTSKAESMSAAANIFVGQTEAPLVVRPYIKNMTQSELFAIMVGGTASIAGSVMAGYAG 
               
               
                   
                 Rd KW20 
                 MGVPLTYLIAASFMAAPAGLLFAKLMFPQTEQFTDKQPEDNDSEKPTNVLEAMAGGASAGMQL 
               
               
                   
                 serotype 
                 ALNVGAMLIAFVGLIALINGILSGVGGWFGYGDLTLQSIFGLIFKPLAYLIGVTDGAEAGIAG 
               
               
                   
                 d(AAC22177 
                 QMIGMKLAVNEFVGYLEFAKYLQPDSAIVLTEKTKAIITFALCGFANFSSIAILIGGLGGMAP 
               
               
                   
                   
                 SRRSDVARLGIKAVIAGTLANLMSATIAGLFIGLGAAAL 
               
               
                   
               
               
                 117 
                 nupC 
                 atgatttttagctctctttttagtgttgtagggatggcggtgctttttcttattgcttgg 
               
               
                   
                 (HP1180) - 
                 gtgttttctagcaataaaagggctattaattatcgcacgattgtcagtgcctttgtgatt 
               
               
                   
                 
                   Helicobacter 
                 
                 caagtggctttaggggcgttggctttatatgtgcctttgggtagggaaatgctgcaaggc 
               
               
                   
                 
                   pylori 
                 
                 ttagccagcggcatacaaagcgtgatttcttacggctatgagggggtgcgttttttattt 
               
               
                   
                 26695 
                 ggcaatctcgctccaaacgctaagggcgatcaagggataggggggtttgtctttgcgatc 
               
               
                   
                 (AAD08224) 
                 aatgttttagcgatcattatcttttttgctagcttgatttcacttctatattatttaaaa 
               
               
                   
                   
                 atcatgcctttatttatcaatctcatcggtggggcgttgcaaaaatgcttaggcacttct 
               
               
                   
                   
                 agagcagaaagcatgagtgcagcggctaatatttttgtagcgcacaccgaagcgccctta 
               
               
                   
                   
                 gtcattaaaccttatttgaaaagcatgagcgattcagagatttttgcggtcatgtgcgtg 
               
               
                   
                   
                 ggcatggctagcgttgcggggcctgtgttagccgggtatgcgagcatgggcattcctttg 
               
               
                   
                   
                 ccttatttgatcgccgcttcgtttatgtccgctcctggggggttgttgttcgctaaaatc 
               
               
                   
                   
                 atttacccacaaaacgaaaccatttctagccatgcagatgtttctatagaaaagcatgtc 
               
               
                   
                   
                 aatgccatagaagctatcgctaatggggcaagcacagggctaaatttagccttgcatgtg 
               
               
                   
                   
                 ggagcgatgcttttagcctttgtggggatgctcgcgctcattaacgggcttttaggggtt 
               
               
                   
                   
                 gtagggggttttttaggcatggagcatttgtctttagggttgattttaggcacgctctta 
               
               
                   
                   
                 aaacccttagcctttatgttaggcattccttggagccaggccgggattgccggagaaatc 
               
               
                   
                   
                 ataggcattaaaatcgcgctcaatgaatttgtgggctatatgcagttattgccttatttg 
               
               
                   
                   
                 ggcgataaccctcctttaatcttgagcgagaaaactaaagcgatcatcacttttgcgttg 
               
               
                   
                   
                 tgcgggtttgctaatttaagctcagtcgctatgctcattggagggcttggcagtttagtg 
               
               
                   
                   
                 cctaaaaagaaggatctcattgtaaggcttgctttaaaagcggtgcttgtaggcacgctt 
               
               
                   
                   
                 tctaatttcatgagcgcgactatcgccgggttattcatagggctaaacgctcattaa 
               
               
                   
               
               
                 145 
                 nupC 
                 MIFSSLFSVVGMAVLFLIAWVFSSNKRAINYRTIVSAFVIQVALGALALYVPLGREMLQG 
               
               
                   
                 (HP1180) - 
                 LASGIQSVISYGYEGVRFLFGNLAPNAKGDQGIGGFVFAINVLAIIIFFASLISLLYYLK 
               
               
                   
                 
                   Helicobacter 
                 
                 IMPLFINLIGGALQKCLGTSRAESMSAAANIFVAHTEAPLVIKPYLKSMSDSEIFAVMCV 
               
               
                   
                 
                   pylori 
                 
                 GMASVAGPVLAGYASMGIPLPYLIAASFMSAPGGLLFAKIIYPQNETISSHADVSIEKHV 
               
               
                   
                 26695 
                 NAIEAIANGASTGLNLALHVGAMLLAFVGMLALINGLLGVVGGFLGMEHLSLGLILGTLL 
               
               
                   
                 (AAD08224) 
                 KPLAFMLGIPWSQAGIAGEIIGIKIALNEFVGYMQLLPYLGDNPPLILSEKTKAIITFAL 
               
               
                   
                   
                 CGFANLSSVAMLIGGLGSLVPKKKDLIVRLALKAVLVGTLSNFMSATIAGLFIGLNAH 
               
               
                   
               
               
                 118 
                 nupC 
                 ATGTTTTTATTAATCAACATTATTGGTCTAATTGTATTTCTTGGTATTGCGGTATTATTTTCA 
               
               
                   
                 (SA0600) - 
                 AGAGATCGCAAAAATATCCAATGGCAATCAATTGGGATCTTAGTTGTTTTAAACCTGTTTTTA 
               
               
                   
                 
                   Staphylococcus 
                 
                 GCATGGTTCTTTATTTATTTTGATTGGGGTCAAAAAGCAGTAAGAGGAGCAGCCAATGGTATC 
               
               
                   
                 
                   aureus 
                 
                 GCTTGGGTAGTTCAGTCAGCGCATGCTGGTACAGGTTTTGCATTTGCAAGTTTGACAAATGTT 
               
               
                   
                 subsp. 
                 AAAATGATGGATATGGCTGTTGCAGCCTTATTCCCAATATTATTAATAGTGCCATTATTTGAT 
               
               
                   
                   aureus  N315 
                 ATCTTAATGTACTTTAATATTTTACCGAAAATTATTGGAGGTATTGGTTGGTTACTAGCTAAA 
               
               
                   
                 (BAB41833) 
                 GTAACAAGACAACCTAAATTCGAGTCATTCTTTGGGATAGAAATGATGTTCTTAGGAAATACT 
               
               
                   
                   
                 GAAGCATTAGCCGTATCAAGTGAGCAACTAAAACGTATGAATGAAATGCGTGTATTAACAATC 
               
               
                   
                   
                 GCAATGATGTCAATGAGCTCTGTATCCGGAGCTATTGTAGGTGCGTATGTACAAATGGTACCA 
               
               
                   
                   
                 GGAGAACTGGTACTAACGGCAATTCCACTAAATATCGTTAACGCGATTATTGTGTCATGCTTG 
               
               
                   
                   
                 TTGAATCCAGTAAGTGTTGAAGAGAAAGAAGATATTATTTACAGTCTTAAAAACAATGAAGTT 
               
               
                   
                   
                 GAACGTCAACCATTCTTCTCATTCCTTGGAGATTCTGTATTAGCAGCAGGTAAATTAGTATTA 
               
               
                   
                   
                 ATCATCATCGCATTTGTTATTAGTTTTGTAGCGTTAGCTGATCTATTTGATCGTTTTATCAAT 
               
               
                   
                   
                 TTGATTACAGGATTGATAGCAGGATGGATAGGCATAAAAGGTAGTTTCGGTTTAAACCAAATT 
               
               
                   
                   
                 TTAGGTGTGTTTATGTATCCATTTGCGCTATTACTCGGTTTACCTTATGATGAAGCGTGGTTG 
               
               
                   
                   
                 GTAGCACAACAAATGGCTAAGAAAATTGTTACAAATGAATTTGTTGTTATGGGTGAAATTTCT 
               
               
                   
                   
                 AAAGATATTGCATCTTATACACCACACCATCGTGCGGTTATTACAACATTCTTAATTTCATTT 
               
               
                   
                   
                 GCAAACTTCTCAACGATTGGTATGATTATCGGTACATTGAAAGGCATTGTTGATAAAAAGACA 
               
               
                   
                   
                 TCAGACTTTGTATCTAAATATGTACCTATGATGCTATTATCAGGTATCCTAGTTTCATTATTA 
               
               
                   
                   
                 ACAGCAGCTTTCGTTGGTTTATTTGCATGGTAA 
               
               
                   
               
               
                 146 
                 nupC 
                 MFLLINIIGLIVFLGIAVLFSRDRKNIQWQSIGILVVLNLFLAWFFIYFDWGQKAVRGAANGI 
               
               
                   
                 (SA0600) - 
                 AWVVQSAHAGTGFAFASLTNVKMMDMAVAALFPILLIVPLFDILMYFNILPKIIGGIGWLLAK 
               
               
                   
                 
                   Staphylococcus 
                 
                 VTRQPKFESFFGIEMMFLGNTEALAVSSEQLKRMNEMRVLTIAMMSMSSVSGAIVGAYVQMVP 
               
               
                   
                 
                   aureus 
                 
                 GELVLTAIPLNIVNAIIVSCLLNPVSVEEKEDIIYSLKNNEVERQPFFSFLGDSVLAAGKLVL 
               
               
                   
                 subsp. 
                 IIIAFVISFVALADLFDRFINLITGLIAGWIGIKGSFGLNQILGVFMYPFALLLGLPYDEAWL 
               
               
                   
                   aureus  N315 
                 VAQQMAKKIVTNEFVVMGEISKDIASYTPHHRAVITTFLISFANFSTIGMIIGTLKGIVDKKT 
               
               
                   
                 (BAB41833) 
                 SDFVSKYVPMMLLSGILVSLLTAAFVGLFAN 
               
               
                   
               
               
                 119 
                 nupC 
                 atgtttttattaatcaacattattggtctaattgtatttcttggtattgcggtattattt 
               
               
                   
                 (SAV0645) - 
                 tcaagagatcgcaaaaatatccaatggcaatcaattgggatcttagttgttttaaacctg 
               
               
                   
                 
                   Staphylococcus 
                 
                 tttttagcatggttctttatttattttgattggggtcaaaaagcagtaagaggagcagcc 
               
               
                   
                 
                   aureus 
                 
                 aatggtatcgcttgggtagttcagtcagcgcatgctggtacaggttttgcatttgcaagt 
               
               
                   
                 subsp. 
                 ttgacaaatgttaaaatgatggatatggctgttgcagccttattcccaatattattaata 
               
               
                   
                   aureus  Mu50 
                 gtgccattatttgatatcttaatgtactttaatattttaccgaaaattattggaggtatt 
               
               
                   
                 (BAB56807) 
                 ggttggttactagctaaagtaacaagacaacctaaattcgagtcattctttgggatagaa 
               
               
                   
                   
                 atgatgttcttaggaaatactgaagcattagccgtatcaagtgagcaactaaaacgtatg 
               
               
                   
                   
                 aatgaaatgcgtgtattaacaatcgcaatgatgtcaatgagctctgtatccggagctatt 
               
               
                   
                   
                 gtaggtgcgtatgtacaaatggtaccaggagaactggtactaacggcaattccactaaat 
               
               
                   
                   
                 atcgttaacgcgattattgtgtcatgcttgttgaatccagtaagtgttgaagagaaagaa 
               
               
                   
                   
                 gatattatttacagtcttaaaaacaatgaagttgaacgtcaaccattcttctcattcctt 
               
               
                   
                   
                 ggagattctgtattagcagcaggtaaattagtattaatcatcatcgcatttgttattagt 
               
               
                   
                   
                 tttgtagcgttagctgatctatttgatcgttttatcaatttgattacaggattgatagca 
               
               
                   
                   
                 ggatggataggcataaaaggtagtttcggtttaaaccaaattttaggtgtgtttatgtat 
               
               
                   
                   
                 ccatttgcgctattactcggtttaccttatgatgaagcgtggttggtagcacaacaaatg 
               
               
                   
                   
                 gctaagaaaattgttacaaatgaatttgttgttatgggtgaaatttctaaagatattgca 
               
               
                   
                   
                 tcttatacaccacaccatcgtgcggttattacaacattcttaatttcatttgcaaacttc 
               
               
                   
                   
                 tcaacgattggtatgattatcggtacattgaaaggcattgttgataaaaagacatcagac 
               
               
                   
                   
                 tttgtatctaaatatgtacctatgatgctattatcaggtatcctagtttcattattaaca 
               
               
                   
                   
                 gcagctttcgttggtttatttgcatggtaa 
               
               
                   
               
               
                 147 
                 nupC 
                 MFLLINIIGLIVFLGIAVLFSRDRKNIQWQSIGILVVLNLFLAWFFIYFDWGQKAVRGAA 
               
               
                   
                 (SAV0645) - 
                 NGIAWVVQSAHAGTGFAFASLTNVKMMDMAVAALFPILLIVPLFDILMYFNILPKIIGGI 
               
               
                   
                 
                   Staphylococcus 
                 
                 GWLLAKVTRQPKFESFFGIEMMFLGNTEALAVSSEQLKRMNEMRVLTIAMMSMSSVSGAI 
               
               
                   
                 
                   aureus 
                 
                 VGAYVQMVPGELVLTAIPLNIVNAIIVSCLLNPVSVEEKEDIIYSLKNNEVERQPFFSFL 
               
               
                   
                 subsp. 
                 GDSVLAAGKLVLIIIAFVISFVALADLFDRFINLITGLIAGWIGIKGSFGLNQILGVFMY 
               
               
                   
                   aureus  Mu50 
                 PFALLLGLPYDEAWLVAQQMAKKIVTNEFVVMGEISKDIASYTPHHRAVITTFLISFANF 
               
               
                   
                 (BAB56807) 
                 STIGMIIGTLKGIVDKKTSDFVSKYVPMMLLSGILVSLLTAAFVGLFAN 
               
               
                   
               
               
                 120 
                 nupC 
                 atgcaatttatttatagtattattggtattttattggtattaggaattgtgtatgcaatt 
               
               
                   
                 (SpNupC) - 
                 tctttcaatcgtaagagtgtttctctaagtttaattggaaaagctcttatcgttcaattc 
               
               
                   
                 
                   Streptococcus 
                 
                 attattgcgctaatcttagtacgtatcccactaggccaacaaattgttagtgttgtttca 
               
               
                   
                 
                   pyogenes 
                 
                 actggagttactagcgtaatcaactgtggtcaagctggtttaaattttgtgtttgggtca 
               
               
                   
                 SF370 
                 ttagcagatagtggcgcaaaaactggttttattttcgctattcaaacgcttggtaatatt 
               
               
                   
                 serotype M1 
                 gttttcttatctgccctagttagtctactttattatgtaggaatccttggatttgtagta 
               
               
                   
                 (AAK34582) 
                 aaatggataggtaagggcgttggtaaaattatgaaatcctcagaggttgagagttttgtt 
               
               
                   
                   
                 gctgtagctaatatgtttcttggtcaaacagacagtccaatcttggttagcaaataccta 
               
               
                   
                   
                 ggtcgtatgactgatagtgagataatggttgtgttggtatcaggtatgggaagtatgtca 
               
               
                   
                   
                 gtttctattcttggtggctatattgcattaggcattccaatggaatatctcttgattgct 
               
               
                   
                   
                 tcaacaatggttcctattggcagtattctcattgctaaaatcttattgcctcaaacagaa 
               
               
                   
                   
                 cctgttcaaaaaattgatgacattaagatggataataaaggtaataacgccaatgtgatt 
               
               
                   
                   
                 gatgcaatcgctgagggtgcaagcacaggtgcacaaatggctttctcaattggtgctagt 
               
               
                   
                   
                 ttgattgcctttgttggtttagtttctttgattaatatgatgttaagtggattgggaatc 
               
               
                   
                   
                 cgcttagaacaaatcttttcatatgtttttgctccatttggttttcttatgggatttgac 
               
               
                   
                   
                 cacaaaaacattcttctagaaggaaaccttcttggaagtaagttgattttaaatgagttt 
               
               
                   
                   
                 gtttcgttccaacaattgggtcacctaatcaaatctttagattatcgtacagcattggta 
               
               
                   
                   
                 gcaactatttcactctgtggttttgctaatttatcaagtttaggtatttgtgtttcaggt 
               
               
                   
                   
                 attgctgttctttgcccggagaaacgtagcaccctagctcgacttgttttccgtgcaatg 
               
               
                   
                   
                 attggtggtattgctgtaagtatgcttagcgcctttatcgtcggtattgtaactctattc 
               
               
                   
                   
                 taa 
               
               
                   
               
               
                 148 
                 nupC 
                 MQFIYSIIGILLVLGIVYAISFNRKSVSLSLIGKALIVQFIIALILVRIPLGQQIVSVVS 
               
               
                   
                 (SpNupC) - 
                 TGVTSVINCGQAGLNFVFGSLADSGAKTGFIFAIQTLGNIVFLSALVSLLYYVGILGFVV 
               
               
                   
                 
                   Streptococcus 
                 
                 KWIGKGVGKIMKSSEVESFVAVANMFLGQTDSPILVSKYLGRMTDSEIMVVLVSGMGSMS 
               
               
                   
                 
                   pyogenes 
                 
                 VSILGGYIALGIPMEYLLIASTMVPIGSILIAKILLPQTEPVQKIDDIKMDNKGNNANVI 
               
               
                   
                 SF370 
                 DAIAEGASTGAQMAFSIGASLIAFVGLVSLINMMLSGLGIRLEQIFSYVFAPFGFLMGFD 
               
               
                   
                 serotype M1 
                 HKNILLEGNLLGSKLILNEFVSFQQLGHLIKSLDYRTALVATISLCGFANLSSLGICVSG 
               
               
                   
                 (AAK34582) 
                 IAVLCPEKRSTLARLVFRAMIGGIAVSMLSAFIVGIVTLF 
               
               
                   
               
               
                 121 
                 nupC 
                 atgagcctgtttatgagcctcatcggcatggcagttctgctaggaatcgcagttctactg 
               
               
                   
                 (VC2352) - 
                 tcaagtaaccgtaaagctatcaatctaagaactgtgggtggcgcttttgctatccaattt 
               
               
                   
                 
                   Vibrio 
                 
                 tcactgggtgcatttattctgtatgtgccttggggccaagagctacttcgtggcttttcg 
               
               
                   
                   cholerae  O1 
                 gatgccgtatcgaatgttattaactacggtaacgatggtacttcattcctcttcggtgga 
               
               
                   
                 biovar E1 
                 ctggtatcaggcaaaatgtttgaagtgtttggcggcggcggtttcattttcgcattccgc 
               
               
                   
                 Tor N16961 
                 gtactaccaacactgatcttcttctcagcactgatttctgtactgtactacttgggtgtt 
               
               
                   
                 (AAF95495) 
                 atgcaatgggttatccgcattcttggcggtggtctgcaaaaagcactgggtacatcacgc 
               
               
                   
                   
                 gcggaatctatgtctgcggctgcaaacattttcgtgggtcaaactgaagcaccattagtt 
               
               
                   
                   
                 gttcgtccattcgttccaaaaatgactcaatctgagctgtttgcggtaatgtgtggtggc 
               
               
                   
                   
                 ttggcttctatcgcaggtggtgtacttgcgggttacgcttcaatgggcgttaagatcgaa 
               
               
                   
                   
                 tacttggtagcggcgtcattcatggcggcaccgggtggtctgctgttcgcaaaactgatg 
               
               
                   
                   
                 atgcctgaaactgaaaaaccacaagacaatgaagacattactcttgatggtggtgacgac 
               
               
                   
                   
                 aaaccggctaacgttatcgatgcggctgctggcggtgcttctgctggtctgcaacttgct 
               
               
                   
                   
                 ctgaacgttggtgcaatgttgattgcctttatcggtttgattgctctgatcaacggtatg 
               
               
                   
                   
                 ttgggtggcatcggtggttggttcggtatgcctgaactgaaactggaaatgctactgggc 
               
               
                   
                   
                 tggttgtttgcgcctctggctttcctgatcggtgttccttggaacgaagcaactgttgcg 
               
               
                   
                   
                 ggtgagttcatcggtctaaaaaccgttgctaacgaattcgttgcttactctcagtttgcg 
               
               
                   
                   
                 ccttacctgactgaagcggcaccagtggttctgtctgagaaaaccaaagcgatcatctct 
               
               
                   
                   
                 ttcgctctgtgtggttttgcgaacctttcttctatcgcaattctgcttggtggtttgggt 
               
               
                   
                   
                 agcttggcacctaagcgtcgtggcgacatcgctcgtatgggggtcaaagcggttatcgca 
               
               
                   
                   
                 ggtactctatctaacctgatggcagcgaccatcgctggcttcttcctctctttctaa 
               
               
                   
               
               
                 149 
                 nupC 
                 MSLFMSLIGMAVLLGIAVLLSSNRKAINLRTVGGAFAIQFSLGAFILYVPWGQELLRGFS 
               
               
                   
                 (VC2352) - 
                 DAVSNVINYGNDGTSFLFGGLVSGKMFEVFGGGGFIFAFRVLPTLIFFSALISVLYYLGV 
               
               
                   
                 
                   Vibrio 
                 
                 MQWVIRILGGGLQKALGTSRAESMSAAANIFVGQTEAPLVVRPFVPKMTQSELFAVMCGG 
               
               
                   
                   Cholerae  O1 
                 LASIAGGVLAGYASMGVKIEYLVAASFMAAPGGLLFAKLMMPETEKPQDNEDITLDGGDD 
               
               
                   
                 biovar E1 
                 KPANVIDAAAGGASAGLQLALNVGAMLIAFIGLIALINGMLGGIGGWFGMPELKLEMLLG 
               
               
                   
                 Tor N16961 
                 WLFAPLAFLIGVPWNEATVAGEFIGLKTVANEFVAYSQFAPYLTEAAPVVLSEKTKAIIS 
               
               
                   
                 (AAF95495) 
                 FALCGFANLSSIAILLGGLGSLAPKRRGDIARMGVKAVIAGTLSNLMAATIAGFFLSF 
               
               
                   
               
               
                 122 
                 nupC 
                 ttgggcggcgttatgtcatcactcctcggtatgggcgcaattttgctggttgcgtggcta 
               
               
                   
                 (VC1953) - 
                 ttttctaccaatagaaaaaatatcaacttgcgtacagtttctttagcgttactgctgcaa 
               
               
                   
                 
                   Vibrio 
                 
                 atcttcttcgccttactggtgctgtatgtacctgcgggtaaagaggcactcaatcgtgtg 
               
               
                   
                   cholerae  O1 
                 acgggcgcggtgtcacaactgatcaactatgggcaagatggtatcggttttgtgtttggt 
               
               
                   
                 biovar E1 
                 ggcctcgccaatggcagcgtaggttttgtgtttgcgattaatgtccttggcatcatcatt 
               
               
                   
                 Tor N16961 
                 ttcttctctgcactgatttctggcctttaccatttaggcatcatgccgaaagtgattaac 
               
               
                   
                 (AAF95101) 
                 ctcatcggtggtggtttacagaaattgcttggcacaggccgtgcagaatccctttctgct 
               
               
                   
                   
                 accgcaaacattttcgtgggtatgattgaagcgccgctggtggtgaaaccttatcttcat 
               
               
                   
                   
                 aaaatgaccgattcgcaattctttgcagtgatgacgggcggcttagcgtcggttgctggc 
               
               
                   
                   
                 ggtactttggttggttatgcctctttaggtgtggaattgaactatctgatcgcggcggct 
               
               
                   
                   
                 ttcatgtctgcccctgcgggtcttttgatggcaaaaatcatgttgccagaaaccgaacac 
               
               
                   
                   
                 gtcgatgccgcgattgcgcaagatgagttggatctgccgaaatccactaacgtcgtcgaa 
               
               
                   
                   
                 gcgattgcggatggcgcgatgtcgggtgtgaaaattgctgttgcggtaggggcgactttg 
               
               
                   
                   
                 ctcgctttcgtgagtgtgattgctctgttaaacggcttgctcggttggtttggtggctgg 
               
               
                   
                   
                 tttggcatcgagctaagctttgaactgatcatggggtatgttttcgctccggtagcttgg 
               
               
                   
                   
                 ctgattggtattccatggcatgaggcgatcacggcaggctcgctgattggtaacaaagtg 
               
               
                   
                   
                 gtggtgaacgagtttgtcgctttcattcaactgattgaagtgaaagagcaattgagtgcg 
               
               
                   
                   
                 cattcacaagcgatcgtgactttcgcgctgtgcggttttgcgaatatttctaccatggcg 
               
               
                   
                   
                 attttgattggtggtttgggtagccttgtacctgaacgtcgctcttttatctcccaatac 
               
               
                   
                   
                 ggcttccgtgcgattggcgcaggcgtattagctaacctaatgagtgcatcgatcgctgga 
               
               
                   
                   
                 gtgattttgtctttgtga 
               
               
                   
               
               
                 150 
                 nupC 
                 MGGVMSSLLGMGAILLVAWLFSTNRKNINLRTVSLALLLQIFFALLVLYVPAGKEALNRV 
               
               
                   
                 (VC1953) - 
                 TGAVSQLINYGQDGIGFVFGGLANGSVGFVFAINVLGIIIFFSALISGLYHLGIMPKVIN 
               
               
                   
                 
                   Vibrio 
                 
                 LIGGGLQKLLGTGRAESLSATANIFVGMIEAPLVVKPYLHKMTDSQFFAVMTGGLASVAG 
               
               
                   
                   Cholerae  O1 
                 GTLVGYASLGVELNYLIAAAFMSAPAGLLMAKIMLPETEHVDAAIAQDELDLPKSTNVVE 
               
               
                   
                 biovar E1 
                 AIADGAMSGVKIAVAVGATLLAFVSVIALLNGLLGWFGGWFGIELSFELIMGYVFAPVAW 
               
               
                   
                 Tor N16961 
                 LIGIPWHEAITAGSLIGNKVVVNEFVAFIQLIEVKEQLSAHSQAIVTFALCGFANISTMA 
               
               
                   
                 (AAF95101) 
                 ILIGGLGSLVPERRSFISQYGFRAIGAGVLANLMSASIAGVILSL 
               
               
                   
               
               
                 123 
                 nupC 
                 atggcgattttgtttggaatcatcggtgttacggtactgatcttatgcgcgtatctgctc 
               
               
                   
                 (VCA0179) - 
                 tctgaaagccgcagtgcgattaattggaaaaccatttcccgagccttgttgttgcaaatt 
               
               
                   
                 
                   Vibrio 
                 
                 ggttttgcggctcttgtgctttatttcccattggggcaaaccgcgctaagcagcttgagt 
               
               
                   
                   Cholerae  O1 
                 aatggggtttctggtttgcttggttttgccgatgtcggcattcgctttctgtttggtgat 
               
               
                   
                 biovar E1 
                 cttgccgatacgggctttatttttgctgttcgtgtattacctatcatcatcttcttcagt 
               
               
                   
                 Tor N16961 
                 gcgctgatttctgccctttattaccttggtgtgatgcaaaaagtgatcgccctgatcggc 
               
               
                   
                 (AAF96092) 
                 ggtggcattcaacgcttcttaggcaccagtaaggcggaatcactggtcgcgacaggcaat 
               
               
                   
                   
                 attttcctatcacaaggcgaatcgccacttttggtgcgccccttccttgccaatatgaca 
               
               
                   
                   
                 cgctctgaactgtttgcggtcatggcgggcggtatggcatcggtagcaggctctgtgctg 
               
               
                   
                   
                 ggtggttacgcaggtttaggggttgagctgaaatacctgattgcagcgagtttcatggcg 
               
               
                   
                   
                 gcgccgggcagtttaatgatggcgaaaatcatcgttcctgagcgtggtgtgccaatcgat 
               
               
                   
                   
                 caaagccaagtcgagttagataaagcgcaagacagcaacttgattgatgctctcgctagc 
               
               
                   
                   
                 ggtgcgatgaatggtatgaaagtcgccgttgcagtgggcactatgttgattgcgttcgtc 
               
               
                   
                   
                 agcgtgatcgctatggtcaacactggccttgaaaatctgggcgatctggttgggtttagc 
               
               
                   
                   
                 ggcattaccttacaagccatgttcggttatctgtttgctcctctggcatgggtgattggc 
               
               
                   
                   
                 attccaagtcacgaagtgctggcggcaggttcctacatcggtcagaaagtggtgatgaac 
               
               
                   
                   
                 gaatttgtggctttcattgactttgttgagcataaagcgctgctttctgagcatagccaa 
               
               
                   
                   
                 gtcatcatcacgtttgcattgtgtggctttgccaacattggctctatcgcgatccaatta 
               
               
                   
                   
                 ggctccattggcgtgatagcccctgagcgccgctcggaagtggcgaacctaggcataaaa 
               
               
                   
                   
                 gcggtcattgctggcactttagccaacctaatgagcgcttgcttagcggggattttcatc 
               
               
                   
                   
                 tcgctataa 
               
               
                   
               
               
                 124 
                 yegT - 
                 atgaaaacaacagcaaagctgtcgttcatgatgtttgttgaatggtttatctggggcgcg 
               
               
                   
                 
                   Escherichia 
                 
                 tggtttgtgccattgtggttgtggttaagtaaaagcggttttagtgccggagaaattggc 
               
               
                   
                   coli  K-12 
                 tggtcgtatgcctgtaccgccattgcggcgatcctgtcgccaattctggttggctccatc 
               
               
                   
                 W3110 
                 actgaccgctttttctcggcgcaaaaagtgctggcggtattgatgttcgcaggcgcgctg 
               
               
                   
                 (P76417; 
                 ctgatgtatttcgctgcgcaacagaccacttttgccgggttcttcccgttactgctggcc 
               
               
                   
                 JW2085) 
                 tactcgctaacctatatgccgaccattgcgctgactaacagcatcgcttttgccaacgtg 
               
               
                   
                   
                 ccggatgttgagcgtgatttcccgcgcattcgtgtgatgggcactatcggctggattgcc 
               
               
                   
                   
                 tccggtctggcatgtggtttcttgccgcaaatactggggtatgccgatatctcaccgact 
               
               
                   
                   
                 aacatcccgctgctgattaccgccggaagttctgctctgctcggtgtgtttgcgtttttc 
               
               
                   
                   
                 ctgcccgacacgccaccaaaaagcaccggcaaaatggatattaaagtcatgctcggcctg 
               
               
                   
                   
                 gatgcgctgatcctgctgcgcgataaaaacttcctcgtctttttcttctgttcattcctg 
               
               
                   
                   
                 tttgcgatgccactagcgttctattacatctttgccaacggttatctgaccgaagttggc 
               
               
                   
                   
                 atgaaaaacgccaccggctggatgacgctcggccagttctctgaaatcttctttatgctg 
               
               
                   
                   
                 gcattgccgtttttcactaaacgctttggtatcaaaaaggtattattgcttggtctggtc 
               
               
                   
                   
                 accgctgcgatccgctatggcttctttatttacggtagtgcggatgaatatttcacctac 
               
               
                   
                   
                 gcgttactgttcctcggtattttgcttcacggcgtaagttacgatttttactacgttacc 
               
               
                   
                   
                 gcttacatctatgtcgataaaaaagcccccgtgcatatgcgtaccgctgcgcaggggctg 
               
               
                   
                   
                 atcacgctctgctgccagggcttcggcagtttgctcggctatcgtcttggcggtgtgatg 
               
               
                   
                   
                 atggaaaagatgttcgcttatcaggaaccggtaaacggactgactttcaactggtccggg 
               
               
                   
                   
                 atgtggactttcggcgcggtgatgattgccattatcgccgtgctgttcatgatttttttc 
               
               
                   
                   
                 cgcgaatccgacaacgaaattacggctatcaaggtcgatgatcgcgatattgcgttgaca 
               
               
                   
                   
                 caaggggaagttaaatga 
               
               
                   
               
               
                 151 
                 yegT - 
                 MKTTAKLSFMMFVEWFIWGAWFVPLWLWLSKSGFSAGEIGWSYACTAIAAILSPILVGSI 
               
               
                   
                 
                   Escherichia 
                 
                 TDRFFSAQKVLAVLMFAGALLMYFAAQQTTFAGFFPLLLAYSLTYMPTIALTNSIAFANV 
               
               
                   
                   coli  K-12 
                 PDVERDFPRIRVMGTIGWIASGLACGFLPQILGYADISPTNIPLLITAGSSALLGVFAFF 
               
               
                   
                 W3110 
                 LPDTPPKSTGKMDIKVMLGLDALILLRDKNFLVFFFCSFLFAMPLAFYYIFANGYLTEVG 
               
               
                   
                 (P76417; 
                 MKNATGWMTLGQFSEIFFMLALPFFTKRFGIKKVLLLGLVTAAIRYGFFIYGSADEYFTY 
               
               
                   
                 JW2085) 
                 ALLFLGILLHGVSYDFYYVTAYIYVDKKAPVHMRTAAQGLITLCCQGFGSLLGYRLGGVM 
               
               
                   
                   
                 MEKMFAYQEPVNGLTFNWSGMWTFGAVMIAIIAVLFMIFFRESDNEITAIKVDDRDIALT 
               
               
                   
                   
                 QGEVK 
               
               
                   
               
               
                 125 
                 nupG - 
                 atgaatcttaagctgcagctgaaaatcctctcttttctgcagttctgtctgtggggaagt 
               
               
                   
                 
                   Escherichia 
                 
                 tggctgacgaccctcggctcctatatgtttgttaccctgaagtttgacggtgcttctatt 
               
               
                   
                   coli  K-12 
                 ggcgcagtttatagctcactgggtatcgcagcggtctttatgcctgcgctgctggggatt 
               
               
                   
                 W3110 
                 gtggccgacaaatggttaagtgcgaaatgggtatatgccatttgccacaccattggcgct 
               
               
                   
                 (P09452; 
                 atcacgctgttcatggcggcacaggtcacgacaccggaagcgatgttccttgtgatattg 
               
               
                   
                 JW2932 
                 attaactcgtttgcttatatgccaacgcttgggttaatcaacaccatctcttactatcgc 
               
               
                   
                   
                 ctgcaaaatgccgggatggatatcgttactgacttcccgccaatccgtatctggggcacc 
               
               
                   
                   
                 atcggctttatcatggcaatgtgggtggtgagcctgtctggcttcgaattaagccacatg 
               
               
                   
                   
                 cagctgtatattggcgcagcactttccgccattctggttctgtttaccctgactctgccg 
               
               
                   
                   
                 catattccggttgctaaacagcaagcgaatcagagctggacaaccctgctgggcctcgat 
               
               
                   
                   
                 gcattcgcgctgtttaaaaacaagcgtatggcaatcttctttatcttctcaatgctgctg 
               
               
                   
                   
                 ggcgcggaactgcagattaccaacatgttcggtaataccttcctgcacagcttcgacaaa 
               
               
                   
                   
                 gatccgatgtttgccagcagctttattgtgcagcatgcgtcaatcatcatgtcgatttcg 
               
               
                   
                   
                 cagatctctgaaaccctgttcattctgaccatcccgttcttcttaagccgctacggtatt 
               
               
                   
                   
                 aagaacgtaatgatgatcagtattgtggcgtggatcctgcgttttgcgctgtttgcttac 
               
               
                   
                   
                 ggcgacccgactccgttcggtactgtactgctggtactgtcgatgatcgtttacggttgc 
               
               
                   
                   
                 gcattcgacttcttcaacatctctggttcggtgtttgtcgaaaaagaagttagcccggca 
               
               
                   
                   
                 attcgcgccagtgcacaagggatgttcctgatgatgactaacggcttcggctgtatcctc 
               
               
                   
                   
                 ggcggcatcgtgagcggtaaagttgttgagatgtacacccaaaacggcattaccgactgg 
               
               
                   
                   
                 cagaccgtatggttgattttcgctggttactccgtggttctggccttcgcgttcatggcg 
               
               
                   
                   
                 atgttcaaatataaacacgttcgtgtcccgacaggcacacagacggttagccactaa 
               
               
                   
               
               
                 152 
                 nupG - 
                 MNLKLQLKILSFLQFCLWGSWLTTLGSYMFVTLKFDGASIGAVYSSLGIAAVFMPALLGI 
               
               
                   
                 
                   Escherichia 
                 
                 VADKWLSAKWVYAICHTIGAITLFMAAQVTTPEAMFLVILINSFAYMPTLGLINTISYYR 
               
               
                   
                   coli  K-12 
                 LQNAGMDIVTDFPPIRIWGTIGFIMAMWVVSLSGFELSHMQLYIGAALSAILVLFTLTLP 
               
               
                   
                 W3110 
                 HIPVAKQQANQSWTTLLGLDAFALFKNKRMAIFFIFSMLLGAELQITNMFGNTFLHSFDK 
               
               
                   
                 (P09452; 
                 DPMFASSFIVQHASIIMSISQISETLFILTIPFFLSRYGIKNVMMISIVAWILRFALFAY 
               
               
                   
                 JW2932 
                 GDPTPFGTVLLVLSMIVYGCAFDFFNISGSVFVEKEVSPAIRASAQGMFLMMTNGFGCIL 
               
               
                   
                   
                 GGIVSGKVVEMYTQNGITDWQTVWLIFAGYSVVLAFAFMAMFKYKHVRVPTGTQTVSH 
               
               
                   
               
               
                 126 
                 xapB - 
                 atgagcatcgcgatgcgcttaaaggtaatgtcctttttgcaatattttatctgggggagc 
               
               
                   
                 
                   Escherichia 
                 
                 tggctggttaccctcggctcttacatgattaatactcttcatttcaccggcgctaatgtt 
               
               
                   
                   coli  K-12 
                 ggcatggtttacagttccaaagggatcgccgcgattattatgcctggtataatggggatc 
               
               
                   
                 W3110 
                 atcgcagacaaatggctgcgcgcagaacgtgcatacatgctgtgtcacctggtgtgtgcg 
               
               
                   
                 (P45562; 
                 ggcgtacttttttatgcggcatccgtaactgatccggatatgatgttttgggtgatgtta 
               
               
                   
                 JW2397) 
                 gtcaatgcgatggcgtttatgccgactattgcgttatcgaacagcgtctcttattcctgt 
               
               
                   
                   
                 cttgcccaggcagggcttgacccggtgaccgctttcccgcccattcgcgtttttggtacg 
               
               
                   
                   
                 gtggggttcattgtcgcgatgtgggcagtaagcctgctgcatctggaattgagtagtctg 
               
               
                   
                   
                 cagctgtatatcgcgtccggtgcgtcattgctgctgtcggcttatgcgctgactttgccg 
               
               
                   
                   
                 aagattccggttgcggagaaaaaagcgaccacatcgcttgccagcaagctgggtctggat 
               
               
                   
                   
                 gccttcgtgctgtttaaaaatccacgcatggccatctttttcctctttgccatgatgctg 
               
               
                   
                   
                 ggtgcggtactgcaaattaccaacgtttttggtaatccgttcctacatgatttcgcccgt 
               
               
                   
                   
                 aacccggagtttgctgacagttttgtggtgaaatatccctccattttactgtcagtttca 
               
               
                   
                   
                 cagatggcagaagtgggctttatactgactatcccattctttttaaagcgatttggcatt 
               
               
                   
                   
                 aaaaccgtcatgctgatgagtatggtggcctggacgctgcgctttggcttcttcgcctat 
               
               
                   
                   
                 ggcgatccgtcaacaaccggatttattttgctgctgctgtcgatgattgtttatggctgt 
               
               
                   
                   
                 gcattcgatttcttcaatatttctggttcggtatttgtcgaacaggaagttgattccagc 
               
               
                   
                   
                 attcgtgccagcgcgcaggggctctttatgaccatggtaaatggtgtcggcgcatgggtt 
               
               
                   
                   
                 ggctcgattctgagtggcatggcagtagattacttttcggtggatggcgtaaaagactgg 
               
               
                   
                   
                 caaactatctggctggtgtttgcaggatatgctctttttctcgcagtgatatttttcttt 
               
               
                   
                   
                 gggtttaaatataatcatgaccctgaaaagataaagcatcgagcggtgactcattaa 
               
               
                   
               
               
                 153 
                 xapB - 
                 MSIAMRLKVMSFLQYFIWGSWLVTLGSYMINTLHFTGANVGMVYSSKGIAAIIMPGIMGI 
               
               
                   
                 
                   Escherichia 
                 
                 IADKWLRAERAYMLCHLVCAGVLFYAASVTDPDMMFWVMLVNAMAFMPTIALSNSVSYSC 
               
               
                   
                   coli  K-12 
                 LAQAGLDPVTAFPPIRVFGTVGFIVAMWAVSLLHLELSSLQLYIASGASLLLSAYALTLP 
               
               
                   
                 W3110 
                 KIPVAEKKATTSLASKLGLDAFVLFKNPRMAIFFLFAMMLGAVLQITNVFGNPFLHDFAR 
               
               
                   
                 (P45562; 
                 NPEFADSFVVKYPSILLSVSQMAEVGFILTIPFFLKRFGIKTVMLMSMVAWTLRFGFFAY 
               
               
                   
                 JW2397) 
                 GDPSTTGFILLLLSMIVYGCAFDFFNISGSVFVEQEVDSSIRASAQGLFMTMVNGVGAWV 
               
               
                   
                   
                 GSILSGMAVDYFSVDGVKDWQTIWLVFAGYALFLAVIFFFGFKYNHDPEKIKHRAVTH 
               
               
                   
               
               
                 127 
                 CC1628 - 
                 ATGGGGACGAGTTTCCGTCTGTTCGTGATGATGGTGCTGCAGCTGGCGATCTGGGGCGCCTGG 
               
               
                   
                 
                   Caulobacter 
                 
                 GCGCCCAAGATCTTCCCCTACATGGGCATGCTGGGCTTCGCGCCCTGGCAGCAGTCGCTGGTC 
               
               
                   
                 
                   crescentus 
                 
                 GGCAGCGCCTGGGGCGTGGCGGCGCTGGTGGGCATCTTCTTCTCGAATCAGTTCGCCGACCGG 
               
               
                   
                 CB15 
                 AACTTCTCGGCCGAGCGGTTCCTGGCGGTCAGCCACCTGATCGGCGGCGTGGCGCTGCTGGGC 
               
               
                   
                 (AAK23606) 
                 ACGGCCTTCTCGACGGAGTTCTGGCCGTTCTTTGCCTGTTACCTCGTTTTCAGCCTGGTCTAT 
               
               
                   
                   
                 GTGCCGACGCTGTCGGTCACCAACTCGATCGCCTTCGCCAATCTGCGCGATCCGGCGGCCGGC 
               
               
                   
                   
                 TTCGGCGGGGTGCGGATGGGCGGAACCGTCGGCTGGGTGCTGGTCAGCTGGCCCTTCGTGTTC 
               
               
                   
                   
                 CTGCTGGGCGCCCAAGCGACGGTGGAGCAGGTCCGCTGGATCTTCCTGGTGGCGGCGATCGTC 
               
               
                   
                   
                 TCCTTCGTTTTCGCCGGTTACGCTCTGACCCTGCCGCACACGCCGCCGCGCAAGGCCGATGAC 
               
               
                   
                   
                 GCTGTCGACAAGCTGGCCTGGCGACGGGCGTTCAAGCTACTGGGCGCGCCCTTCGTGTTTGTC 
               
               
                   
                   
                 CTCTTTGTCGTGACCTTCATCGATTCCGTGATCCACAACGGCTACTTCGTGATGGCCGACGCC 
               
               
                   
                   
                 TTCCTGACCAACCGGGTCGGGATCGCGGGCAATCTCAGCATGGTCGTGCTGAGCCTGGGCCAG 
               
               
                   
                   
                 GTGGCCGAAATCATCACCATGCTGCTGTTGGGCCGCGTGCTGGCCAAGCTGGGCTGGAAGGTC 
               
               
                   
                   
                 ACCATGATCGTCGGCGTGCTGGGCCACGCCGCGCGCTTTGCGGTCTTCGCCTACTTCGCCGAC 
               
               
                   
                   
                 AGCGTGCCGGTCATCGTGGCGGTGCAGCTGCTGCACGGCGTCTGCTACGCCTTCTTCTTCGCC 
               
               
                   
                   
                 ACGGTTTACATCTTCGTCGACGCCGTCTTCCCGAAAGATGTCCGCTCCAGCGCGCAGGGTCTG 
               
               
                   
                   
                 TTCAACTTGCTGATCCTGGGCGTCGGCAATGTGGCCGCCAGCTTCATCTTCCCCGCGCTGATC 
               
               
                   
                   
                 GGTCGCCTGACCACCGATGGGTCCGTCGACTACACGACGCTGTTCCTCGTGCCGACCGCCATG 
               
               
                   
                   
                 GCTTTGGCGGCGGTCTGCCTGCTGGCGCTGTTCTTCCGGCCGCCCACGCGGGGACCTGTTTCG 
               
               
                   
                   
                 GAGGCGGATTCCGCTTCATCCGCCGCCAGTTCGGCCCAAGCCTAG 
               
               
                   
               
               
                 154 
                 CC1628 - 
                 MGTSFRLFVMMVLQLAIWGAWAPKIFPYMGMLGFAPWQQSLVGSAWGVAALVGIFFSNQFADR 
               
               
                   
                 
                   Caulobacter 
                 
                 NFSAERFLAVSHLIGGVALLGTAFSTEFWPFFACYLVFSLVYVPTLSVTNSIAFANLRDPAAG 
               
               
                   
                 
                   crescentus 
                 
                 FGGVRMGGTVGWVLVSWPFVFLLGAQATVEQVRWIFLVAAIVSFVFAGYALTLPHTPPRKADD 
               
               
                   
                 CB15 
                 AVDKLAWRRAFKLLGAPFVFVLFVVTFIDSVIHNGYFVMADAFLTNRVGIAGNLSMVVLSLGQ 
               
               
                   
                 (AAK23606) 
                 VAEIITMLLLGRVLAKLGWKVTMIVGVLGHAARFAVFAYFADSVPVIVAVQLLHGVCYAFFFA 
               
               
                   
                   
                 TVYIFVDAVFPKDVRSSAQGLFNLLILGVGNVAASFIFPALIGRLTTDGSVDYTTLFLVPTAM 
               
               
                   
                   
                 ALAAVCLLALFFRPPTRGPVSEADSASSAASSAQA 
               
               
                   
               
               
                 128 
                 codB - 
                 gtgtcgcaagataacaactttagccaggggccagtcccgcagtcggcgcggaaaggggta 
               
               
                   
                 
                   Escherichia 
                 
                 ttggcattgacgttcgtcatgctgggattaaccttcttttccgccagtatgtggaccggc 
               
               
                   
                   coli  K-12 
                 ggcactctcggaaccggtcttagctatcatgatttcttcctcgcagttctcatcggtaat 
               
               
                   
                 W3110 
                 cttctcctcggtatttacacttcatttctcggttacattggcgcaaaaaccggcctgacc 
               
               
                   
                 (P25525; 
                 actcatcttcttgctcgcttctcgtttggtgttaaaggctcatggctgccttcactgcta 
               
               
                   
                 JW0327) 
                 ctgggcggaactcaggttggctggtttggcgtcggtgtggcgatgtttgccattccggtg 
               
               
                   
                   
                 ggtaaggcaaccgggctggatattaatttgctgattgccgtttccggtttactgatgacc 
               
               
                   
                   
                 gtcaccgtcttttttggcatttcggcgctgacggttctttcggtgattgcggttccggct 
               
               
                   
                   
                 atcgcctgcctgggcggttattccgtgtggctggctgttaacggcatgggcggcctggac 
               
               
                   
                   
                 gcattaaaagcggtcgttcccgcacaaccgttagatttcaatgtcgcgctggcgctggtt 
               
               
                   
                   
                 gtggggtcatttatcagtgcgggtacgctcaccgctgactttgtccggtttggtcgcaat 
               
               
                   
                   
                 gccaaactggcggtgctggtggcgatggtggcctttttcctcggcaactcgttgatgttt 
               
               
                   
                   
                 attttcggtgcagcgggcgctgcggcactgggcatggcggatatctctgatgtgatgatt 
               
               
                   
                   
                 gctcagggcctgctgctgcctgcgattgtggtgctggggctgaatatctggaccaccaac 
               
               
                   
                   
                 gataacgcactctatgcgtcgggtttaggtttcgccaacattaccgggatgtcgagcaaa 
               
               
                   
                   
                 accctttcggtaatcaacggtattatcggtacggtctgcgcattatggctgtataacaat 
               
               
                   
                   
                 tttgtcggctggttgaccttcctttcggcagctattcctccagtgggtggcgtgatcatc 
               
               
                   
                   
                 gccgactatctgatgaaccgtcgccgctatgagcactttgcgaccacgcgtatgatgagt 
               
               
                   
                   
                 gtcaattgggtggcgattctggcggtcgccttggggattgctgcaggccactggttaccg 
               
               
                   
                   
                 ggaattgttccggtcaacgcggtattaggtggcgcgctgagctatctgatccttaacccg 
               
               
                   
                   
                 attttgaatcgtaaaacgacagcagcaatgacgcatgtggaggctaacagtgtcgaataa 
               
               
                   
               
               
                 155 
                 codB - 
                 MSQDNNFSQGPVPQSARKGVLALTFVMLGLTFFSASMWTGGTLGTGLSYHDFFLAVLIGN 
               
               
                   
                 Escherichia 
                 LLLGIYTSFLGYIGAKTGLTTHLLARFSFGVKGSWLPSLLLGGTQVGWFGVGVAMFAIPV 
               
               
                   
                 coli K-12 
                 GKATGLDINLLIAVSGLLMTVTVFFGISALTVLSVIAVPAIACLGGYSVWLAVNGMGGLD 
               
               
                   
                 W3110 
                 ALKAVVPAQPLDFNVALALVVGSFISAGTLTADFVRFGRNAKLAVLVAMVAFFLGNSLMF 
               
               
                   
                 (P25525; 
                 IFGAAGAAALGMADISDVMIAQGLLLPAIVVLGLNIWTTNDNALYASGLGFANITGMSSK 
               
               
                   
                 JW0327) 
                 TLSVINGIIGTVCALWLYNNFVGWLTFLSAAIPPVGGVIIADYLMNRRRYEHFATTRMMS 
               
               
                   
                   
                 VNWVAILAVALGIAAGHWLPGIVPVNAVLGGALSYLILNPILNRKTTAAMTHVEANSVE 
               
               
                   
               
               
                 129 
                 mctC - 
                 ATGAATTCCACTATTCTCCTTGCACAAGACGCTGTTTCTGAGGGCGTCGGTAATCCGATTCTT 
               
               
                   
                 
                   Corynebacterium 
                 
                 AACATCAGTGTCTTCGTCGTCTTCATTATTGTGACGATGACCGTGGTGCTTCGCGTGGGCAAG 
               
               
                   
                   
                 AGCACCAGCGAATCCACCGACTTCTACACCGGTGGTGCTTCCTTCTCCGGAACCCAGAACGGT 
               
               
                   
                   
                 CTGGCTATCGCAGGTGACTACCTGTCTGCAGCGTCCTTCCTCGGAATCGTTGGTGCAATTTCA 
               
               
                   
                   
                 CTCAACGGTTACGACGGATTCCTTTACTCCATCGGCTTCTTCGTCGCATGGCTTGTTGCACTG 
               
               
                   
                   
                 CTGCTCGTGGCAGAGCCACTTCGTAACGTGGGCCGCTTCACCATGGCTGACGTGCTGTCCTTC 
               
               
                   
                   
                 CGACTGCGTCAGAAACCAGTCCGCGTCGCTGCGGCCTGCGGTACCCTCGCGGTTACCCTCTTT 
               
               
                   
                   
                 TACTTGATCGCTCAGATGGCTGGTGCAGGTTCGCTTGTGTCCGTTCTGCTGGACATCCACGAG 
               
               
                   
                   
                 TTCAAGTGGCAGGCAGTTGTTGTCGGTATCGTTGGCATTGTCATGATCGCCTACGTTCTTCTT 
               
               
                   
                   
                 GGCGGTATGAAGGGCACCACATACGTTCAGATGATTAAGGCAGTTCTGCTGGTCGGTGGCGTT 
               
               
                   
                   
                 GCCATTATGACCGTTCTGACCTTCGTCAAGGTGTCTGGTGGCCTGACCACCCTTTTAAATGAC 
               
               
                   
                   
                 GCTGTTGAGAAGCACGCCGCTTCAGATTACGCTGCCACCAAGGGGTACGATCCAACCCAGATC 
               
               
                   
                   
                 CTGGAGCCTGGTCTGCAGTACGGTGCAACTCTGACCACTCAGCTGGACTTCATTTCCTTGGCT 
               
               
                   
                   
                 CTCGCTCTGTGTCTTGGAACCGCTGGTCTGCCACACGTTCTGATGCGCTTCTACACCGTTCCT 
               
               
                   
                   
                 ACCGCCAAGGAAGCACGTAAGTCTGTGACCTGGGCTATCGTCCTCATTGGTGCGTTCTACCTG 
               
               
                   
                   
                 ATGACCCTGGTCCTTGGTTACGGCGCTGCGGCACTGGTCGGTCCAGACCGCGTCATTGCCGCA 
               
               
                   
                   
                 CCAGGTGCTGCTAATGCTGCTGCTCCTCTGCTGGCCTTCGAGCTTGGTGGTTCCATCTTCATG 
               
               
                   
                   
                 GCGCTGATTTCCGCAGTTGCGTTCGCTACCGTTCTCGCCGTGGTCGCAGGTCTTGCAATTACC 
               
               
                   
                   
                 GCATCCGCTGCTGTTGGTCACGACATCTACAACGCTGTTATCCGCAACGGTCAGTCCACCGAA 
               
               
                   
                   
                 GCGGAGCAGGTCCGAGTATCCCGCATCACCGTTGTCGTCATTGGCCTGATTTCCATTGTCCTG 
               
               
                   
                   
                 GGAATTCTTGCAATGACCCAGAACGTTGCGTTCCTCGTGGCCCTGGCCTTCGCAGTTGCAGCA 
               
               
                   
                   
                 TCCGCTAACCTGCCAACCATCCTGTACTCCCTGTACTGGAAGAAGTTCAACACCACCGGCGCT 
               
               
                   
                   
                 GTGGCCGCTATCTACACCGGTCTCATCTCCGCGCTGCTGCTGATCTTCCTGTCCCCAGCAGTC 
               
               
                   
                   
                 TCCGGTAATGACAGCGCAATGGTTCCAGGTGCAGACTGGGCAATCTTCCCACTGAAGAACCCA 
               
               
                   
                   
                 GGCCTCGTCTCCATCCCACTGGCATTCATCGCTGGTTGGATCGGCACTTTGGTTGGCAAGCCA 
               
               
                   
                   
                 GACAACATGGATGATCTTGCTGCCGAAATGGAAGTTCGTTCCCTCACCGGTGTCGGTGTTGAA 
               
               
                   
                   
                 AAGGCTGTTGATCACTAA 
               
               
                   
               
               
                 130 
                 putP_6 - 
                 atggatcttacgacattaataacttttatagtatatctactagggatgttggcgattggcctc 
               
               
                   
                 
                   Virgibacillus 
                 
                 atcatgtattatcgaaccaataatttatcagattatgttcttggtggacgtgatcttggtcca 
               
               
                   
                 sp. 
                 ggcgtagctgcattgagtgctggtgcatcggatatgagtggttggctgttattaggtttgcct 
               
               
                   
                   
                 ggagcgatttatgcatctggtatgtctgaagcttggatggggatcgggttagctgtaggtgct 
               
               
                   
                   
                 tatttaaattggcaatttgtagctaagcgattacgcgtttataccgaggtatcaaataattcc 
               
               
                   
                   
                 attacgatcccagattattttgaaaatcggtttaaagataactcacatattcttcgtgttata 
               
               
                   
                   
                 tctgctatcgtaattttgttattcttcactttttatacatcttcaggaatggttgcaggagca 
               
               
                   
                   
                 aaattatttgaggcttcattcggtctccaatacgaaactgctctgtggattggtgcggttgta 
               
               
                   
                   
                 gttgtatcttatacgttacttggaggatttctagcggttgcatggacagactttattcaaggt 
               
               
                   
                   
                 attcttatgttccttgcactaattgttgttccaatcgtcgcattagatcaaatgggtggctgg 
               
               
                   
                   
                 aatcaagcggtacaagctgttggtgaaattaatccttcccacctcaatatggttgaaggtgtt 
               
               
                   
                   
                 ggaataatggcaattatttcatcacttgcttggggcttaggttattttggacagccacatatt 
               
               
                   
                   
                 attgttcgttttatggcattacgttcggcgaaagatgttccgaaagcgaaatttattggaaca 
               
               
                   
                   
                 gcttggatgattttaggactttatggagcaatctttactggttttgtaggactagcatttatc 
               
               
                   
                   
                 agtacacaagaagtaccgattctgtctgaattcgggattcaagtagttaatgagaatggttta 
               
               
                   
                   
                 caaatgttagccgatcctgaaaagatatttattgctttctcccaaatactattccatccagta 
               
               
                   
                   
                 gttgccggtatcttactagcggcaatcttgtctgcaattatgagtaccgttgattcacagtta 
               
               
                   
                   
                 cttgtatcatcttcagcggttgcagaagatttctataaagctattttccgtaaaaaagctact 
               
               
                   
                   
                 ggtaaagagcttgtttgggttggacgtattgctacagtgataattgcgattgttgctttaatt 
               
               
                   
                   
                 attgcaatgaacccagatagctctgtattggatctagttagttatgcatgggctggatttggt 
               
               
                   
                   
                 gcagcatttggaccaattatcatcttgtcattattctggaagagaatcacaagaaatggtgca 
               
               
                   
                   
                 ctagcgggtatcattgtaggtgccattacggtaattgtatggggagactttctatctggaggt 
               
               
                   
                   
                 atctttgacctctacgaaattgttccaggctttatcttaaatatgattgtcaccgttattgtg 
               
               
                   
                   
                 agtcttatcgataaaccgaatccagatttagaagctgactttgatgaaaccgtagaaaaaatg 
               
               
                   
                   
                 aaagaataa 
               
               
                   
               
               
                 131 
                 cbsT1 - 
                 ATGTCGACCACACCGACACAGCCATCATCACGAAAACAGGCTGTTTACCCGTACTTGATCGTG 
               
               
                   
                 
                   Lactobacillus 
                 
                 CTGTCGGGCATCGTCTTCACGGCCATCCCGGTATCGCTGGTCTGCAGTTGCGCAGGTATCTTC 
               
               
                   
                 
                   johnsonii 
                 
                 TTCACGCCTGTCAGCAGCTACTTCCATGTTCCCAAGGCCGCATTCACCGGATATTTCAGCATA 
               
               
                   
                   
                 TTCAGCATCACCATGGTCGCCTTCCTGCCGGTGGCCGGATGGCTGATGCACCGCTACGATCTG 
               
               
                   
                   
                 CGCATCGTACTGACCGCAAGCACCGTCCTGGCTGGACTGGGCTGCCTGGGTATGTCCCGATCA 
               
               
                   
                   
                 TCCGCCATGTGGCAGTTCTATCTATGCGGAGTGGTTCTGGGAATCGGCATGCCGGCCGTCCTC 
               
               
                   
                   
                 TATCTGTCAGTGCCAACACTCATCAACGCCTGGTTCCGCAAGCGGGTCGGGTTCTTCATCGGC 
               
               
                   
                   
                 CTGTGCATGGCCTTCACCGGCATAGGCGGCGTGATCTTCAACCAGATAGGCACCATGATCATC 
               
               
                   
                   
                 AGATCCGCCCCTGATGGATGGAGGCGGGGATATCTGGTTTTCGCTATTCTCATCCTGGTGATC 
               
               
                   
                   
                 ACCCTGCCCTTCACCATTTTCGTCATTCGCAGCACACCCGAACAGATGGGTCTGCATCCCTAC 
               
               
                   
                   
                 GGCGCCGACCAGGAGCCTGATGCAGCTGAGACGGCCACCAATAGTGCAGGCACCGGGAGCAAA 
               
               
                   
                   
                 GACCAAAAGAGTCCTGAGCCTGCAGCGTCAACCGTAGGCATGACTGCCTCCCAGGCCTTGCGC 
               
               
                   
                   
                 TCCCCTGCCTTCTGGGCGCTGGCGCTCTTCTGCGGTCTGATCACCATGAATCAGACCATTTAC 
               
               
                   
                   
                 CAGTTCCTGCCCTCCTACGCGGCATCCCTGCCATCCATGGCAGCCTACACGGGACTGATCGCC 
               
               
                   
                   
                 TCCTCCTGCATGGCCGGCCAGGCCATCGGCAAGATCATCCTGGGCATGGTCAACGACGGCAGC 
               
               
                   
                   
                 ATCGTAGGCGGTCTCTGTCTGGGCATCGGCGGCGGCATTCTCGGCGTCTGCCTCATGGTCGCC 
               
               
                   
                   
                 TTCCCCGGATTGCCCGTGCTCCTCCTGCTGGGAGCCTTTGCCTTCGGCCTTGTCTACGCCTGC 
               
               
                   
                   
                 ACTACTGTGCAGACACCAATCCTGGTTACAGCGGTCTTCGGCTCGCGCGACTACACCAACATC 
               
               
                   
                   
                 TATGCACGTATCCAGATGGTTGGGTCCCTAGCCTCGGCCTTCGCAGCTCTCTTCTGGGGCGCC 
               
               
                   
                   
                 ATCGCTGACCAGCCCCACGGCTACATCATCATGTTCGGTCTGAGCATCCTGATCATGGTTGTG 
               
               
                   
                   
                 GCCTTGTTCCTAGGCATTATCCCTCTGAAAGGTACGCGCAAGTTGACCGATCAGATCGCCTGA 
               
               
                   
               
               
                 132 
                 cbsT2 - 
                 atgtctactgatgccgctactaaagataaagtagtaagcaagggctataaatacttcatggtt 
               
               
                   
                 
                   Lactobacillus 
                 
                 ttcctttgtatgttaacccaagctattccttatggaattgctcaaaacattcagcctttgttt 
               
               
                   
                 
                   johnsonii 
                 
                 atccaccctttagttaatactttccactttaccttagcatcgtacacattaatttttacgttt 
               
               
                   
                   
                 ggtgcggtttttgcttcagttgcttctccatttattggtaaggcattagaaaaagttaacttc 
               
               
                   
                   
                 cgactaatgtatttaattggtattggtctttctgctattgcctacgtaatttttggaattagt 
               
               
                   
                   
                 acaaaactacccggtttctatattgccgctatcatttgtatggttggttcaaccttttactcc 
               
               
                   
                   
                 ggccaaggtgttccctgggttattaaccactggttcccagcaaagggacgtggggctgcctta 
               
               
                   
                   
                 ggaattgccttctgcggtggttctattggtaatatctttttacaaccagcaacccaagctatt 
               
               
                   
                   
                 ttaaaacactacatgacaggtaatactaagaccggtcatttaacctctatggcaccattcttt 
               
               
                   
                   
                 atctttgccgtagctttattagtaatcggtgtaattatcgcctgcttcattagaacccctaag 
               
               
                   
                   
                 aaagacgaaattgttgtttctgatgcagaactagctgaaagcaagaaagctgaagccgcagcc 
               
               
                   
                   
                 aaagctaaagagtttaaaggctggactagtaaacaagtgttacaaatgaaatggttctggatt 
               
               
                   
                   
                 ttcagccttggtttcttaatcattggtttaggcttagcttctttaaatgaagactatgccgcc 
               
               
                   
                   
                 ttccttgatactaagctttctttaaccgatgttggtttagttgggtcaatgtacggtgttggt 
               
               
                   
                   
                 tgtttaatcggaaatatttctggtggtttcttatttgataaatttggtacagcaaaatcaatg 
               
               
                   
                   
                 acctatgctggttgtatgtatattttatctattctgatgatgatctttattagcttccagcca 
               
               
                   
                   
                 tatggttcatctattagtaaggctgctggcattggctatgctatcttttgcggcttagctgta 
               
               
                   
                   
                 tttagttacatgtcaggcccagccttcatggcaaaagacctctttggttcaagagatcaaggt 
               
               
                   
                   
                 gtcatgcttggatacgttggtttagcttatgcaattggctatgccattggtgctccactattt 
               
               
                   
                   
                 gggattattaagggagcggcaagctttacagttgcttggtactttatgattgcctttgttgca 
               
               
                   
                   
                 attggttttatcattttagtatttgccgttatccaaattaagagataccaaaagaaatacatt 
               
               
                   
                   
                 gcagagcaagcagcaaaagctaatgctaaataa 
               
               
                   
               
               
                 133 
                 amtB - 
                 atgaagatagcgacgataaaaactgggcttgcttcactggcgatgcttccgggactggta 
               
               
                   
                 
                   Escherichia  
                 
                 atggctgcacctgcggtggccgataaagccgacaatgcgtttatgatgatttgtactgcg 
               
               
                   
                 
                   coli 
                 
                 ctggtgctgtttatgactattccggggattgccctgttttacggtgggttgattcgcggc 
               
               
                   
                 K-12 MG1655 
                 aaaaacgtgctgtcgatgctgacgcaggtgacggtgacatttgcactggtctgtattctc 
               
               
                   
                 (B0451; 
                 tgggtggtttacggttactcgctggcgtttggtgagggcaacaacttcttcggcaacatt 
               
               
                   
                 945084) 
                 aactggttgatgctgaaaaacatcgaactgacggcggtgatgggcagcatttatcagtat 
               
               
                   
                   
                 atccacgtggcgtttcagggatcgtttgcctgcattaccgtcggcttgatagttggggcg 
               
               
                   
                   
                 ctggcggaacgaatccgcttctcagctgtgttgattttcgtggtggtatggctgacgctc 
               
               
                   
                   
                 tcttacattccgattgcgcatatggtgtggggcggtggtttgctggcttctcacggtgcg 
               
               
                   
                   
                 ctggatttcgcgggtggcaccgtggtgcacattaacgccgcaatcgccggtctggtgggc 
               
               
                   
                   
                 gcgtatctgataggaaaacgcgtgggcttcggtaaagaggcgtttaaaccgcacaacctg 
               
               
                   
                   
                 ccgatggtcttcaccgggactgccattctctatatcggttggtttggctttaacgccggg 
               
               
                   
                   
                 tcagcgggcacggcgaatgaaatcgcggcactggcatttgtgaatactgtggtcgcaacg 
               
               
                   
                   
                 gcggcggcaattcttggctggatcttcggtgaatgggcgctgcgtggtaagccttcactg 
               
               
                   
                   
                 ctgggggcgtgttctggcgcgattgccggtctggtcggcgtgacgccagcctgcggctac 
               
               
                   
                   
                 attggggttggcggcgcgttgattatcggcgtggtagctggtctggcgggcttgtggggc 
               
               
                   
                   
                 gttaccatgctcaaacgcttgctgcgggtggatgatccctgcgatgtcttcggtgtgcac 
               
               
                   
                   
                 ggcgtttgtggcattgtcggctgtatcatgaccgggatttttgccgccagctcgctgggc 
               
               
                   
                   
                 ggcgtgggcttcgctgaaggtgtgacgatgggccatcagttgctggtacagctggaaagc 
               
               
                   
                   
                 atcgccattacgatcgtctggtccggtgttgtggcatttatcggctacaaattggcggat 
               
               
                   
                   
                 ctgacggttggtctgcgtgtaccggaagagcaggagcgagaagggctggatgtcaacagc 
               
               
                   
                   
                 cacggcgagaatgcctataacgcgtaa 
               
               
                   
               
               
                 156 
                 amtB - 
                 MKIATIKTGLASLAMLPGLVMAAPAVADKADNAFMMICTALVLFMTIPGIALFYGGLIRG 
               
               
                   
                 
                   Escherichia  
                 
                 KNVLSMLTQVTVTFALVCILWVVYGYSLAFGEGNNFFGNINWLMLKNIELTAVMGSIYQY 
               
               
                   
                 
                   coli 
                 
                 IHVAFQGSFACITVGLIVGALAERIRFSAVLIFVVVWLTLSYIPIAHMVWGGGLLASHGA 
               
               
                   
                 K-12 MG1655 
                 LDFAGGTVVHINAAIAGLVGAYLIGKRVGFGKEAFKPHNLPMVFTGTAILYIGWFGFNAG 
               
               
                   
                 (B0451; 
                 SAGTANEIAALAFVNTVVATAAAILGWIFGEWALRGKPSLLGACSGAIAGLVGVTPACGY 
               
               
                   
                 945084) 
                 IGVGGALIIGVVAGLAGLWGVTMLKRLLRVDDPCDVFGVHGVCGIVGCIMTGIFAASSLG 
               
               
                   
                   
                 GVGFAEGVTMGHQLLVQLESIAITIVWSGVVAFIGYKLADLTVGLRVPEEQEREGLDVNS 
               
               
                   
                   
                 HGENAYNA 
               
               
                   
               
               
                 134 
                 GABA permease 
                 atggggcaatcatcgcaaccacatgagttaggcggcgggctgaagtcacgccacgtcaccatg 
               
               
                   
                 GabP - 
                 ttgtctattgccggtgttatcggcgcaagtctgtttgtcggttccagcgtcgccatcgccgaa 
               
               
                   
                 
                   Escherichia  
                 
                 gcgggcccggcggtattactggcctatctgttcgccggattactggtggttatgattatgcgg 
               
               
                   
                 
                   coli 
                 
                 atgttggcggaaatggcagttgccacgcccgataccggttcgttttccacctatgccgataaa 
               
               
                   
                   
                 gccattggccgctgggcgggttataccatcggctggctgtactggtggttttgggtactggtt 
               
               
                   
                   
                 atcccgctggaagccaacatcgccgctatgatcctgcactcgtgggttccaggcattcccatc 
               
               
                   
                   
                 tggttattttccctcgtcattaccctcgccttaactggcagtaatttattaagcgttaaaaac 
               
               
                   
                   
                 tacggcgaatttgagttctggctggcgctgtgcaaagtcatcgctatcctggcctttattttc 
               
               
                   
                   
                 cttggtgcagtcgcaattagcggtttttacccttatgccgaagtgagcgggatctcaagattg 
               
               
                   
                   
                 tgggatagcggcggctttatgcccaacggtttcggtgcggtattaagcgcgatgttgatcacc 
               
               
                   
                   
                 atgttctcgtttatgggcgcagaaattgtcaccattgccgccgcggaatccgacacgccggaa 
               
               
                   
                   
                 aaacatattgtccgcgccactaactcggttatctggcgtatttctatcttctatttgtgctct 
               
               
                   
                   
                 atttttgtcgtagtggcgttaataccgtggaatatgccggggctgaaagccgttggttcttat 
               
               
                   
                   
                 cgctcggttctggaattgctcaatattccccatgcgaaattaatcatggactgcgtgatatta 
               
               
                   
                   
                 ctttccgtaaccagctgtctgaactcggcgctgtataccgcgtcaaggatgctctactcctta 
               
               
                   
                   
                 agccgtcgcggtgatgcgcccgcggtaatgggcaaaatcaaccgcagtaaaaccccgtatgtg 
               
               
                   
                   
                 gcggtgttactctccaccggagcggcatttttaacggtggtggtgaactattacgcacctgcg 
               
               
                   
                   
                 aaagtgtttaaattcctgatagacagctccggtgctatcgccctgctggtttatttagtcatc 
               
               
                   
                   
                 gccgtttcacagttgcggatgcgtaaaattctgcgagcagaaggaagcgaaattcgcttgcgc 
               
               
                   
                   
                 atgtggctttacccgtggctcacctggctggtaataggctttattacctttgtgttggtagtg 
               
               
                   
                   
                 atgctattccgcccggcgcaacagttagaagtgatctctaccggcttattagcgatagggatt 
               
               
                   
                   
                 atctgtaccgtgccgattatggcgcgctggaaaaagctggtattgtggcaaaaaacacccgtt 
               
               
                   
                   
                 cataatacgcgctga 
               
               
                   
               
               
                 157 
                 GABA permease 
                 MGQSSQPHELGGGLKSRHVTMLSIAGVIGASLFVGSSVAIAEAGPAVLLAYLFAGLLVVMIMR 
               
               
                   
                 GabP - 
                 MLAEMAVATPDTGSFSTYADKAIGRWAGYTIGWLYWWFWVLVIPLEANIAAMILHSWVPGIPI 
               
               
                   
                 
                   Escherichia  
                 
                 WLFSLVITLALTGSNLLSVKNYGEFEFWLALCKVIAILAFIFLGAVAISGFYPYAEVSGISRL 
               
               
                   
                 
                   coli 
                 
                 WDSGGFMPNGFGAVLSAMLITMFSFMGAEIVTIAAAESDTPEKHIVRATNSVIWRISIFYLCS 
               
               
                   
                   
                 IFVVVALIPWNMPGLKAVGSYRSVLELLNIPHAKLIMDCVILLSVTSCLNSALYTASRMLYSL 
               
               
                   
                   
                 SRRGDAPAVMGKINRSKTPYVAVLLSTGAAFLTVVVNYYAPAKVFKFLIDSSGAIALLVYLVI 
               
               
                   
                   
                 AVSQLRMRKILRAEGSEIRLRMWLYPWLTWLVIGFITFVLVVMLFRPAQQLEVISTGLLAIGI 
               
               
                   
                   
                 ICTVPIMARWKKLVLWQKTPVHNTR 
               
               
                   
               
               
                 135 
                 mtnH - 
                 atgacgaactatcgcgttgagagtagcagcggacgggcggcgcgcaagatgaggctcgcatta 
               
               
                   
                 
                   Escherichia  
                 
                 atgggacctgcgttcattgcggcgattggttatatcgatcccggtaactttgcgaccaatatt 
               
               
                   
                 
                   coli 
                 
                 caggcgggtgccagcttcggctatcagctactgtgggttgtcgtttgggccaacctgatggcg 
               
               
                   
                   
                 atgctgattcagatcctctctgccaaactagggattgccaccggtaaaaatctggcggagcag 
               
               
                   
                   
                 attcgcgatcactatccgcgtcccgtagtgtggttctattgggttcaggcagaaattattgcg 
               
               
                   
                   
                 atggcaaccgacctggcggaatttattggtgcggcgatcggttttaaactcattcttggtgtc 
               
               
                   
                   
                 tcgttgttgcagggcgcggtgctgacggggatcgcgactttcctgattttaatgctgcaacgt 
               
               
                   
                   
                 cgcgggcaaaaaccgctggagaaagtgattggcgggttactgttgtttgttgccgcggcttac 
               
               
                   
                   
                 attgtcgagttgattttctcccagcctaacctggcgcagctgggtaaaggaatggtgatcccg 
               
               
                   
                   
                 agtttacctacttcggaggcggtcttcctggcagcaggcgtgttaggggcgacgattatgccg 
               
               
                   
                   
                 catgtgatttatttgcactcctcgctcactcagcatttacatggcggttcgcgtcaacaacgt 
               
               
                   
                   
                 tattccgccaccaaatgggatgtggctatcgccatgacgattgccggttttgtcaatctggcg 
               
               
                   
                   
                 atgatggctacagctgcggcggcgttccacttttctggtcatactggtgttgccgatcttgat 
               
               
                   
                   
                 gaggcttatctgacgctgcaaccgctgttaagccatgctgcggcaacggtctttgggttaagt 
               
               
                   
                   
                 ctggttgctgccggactgtcctcaacggtggtggggacactggcggggcaggtggtgatgcag 
               
               
                   
                   
                 ggattcattcgcttccatatcccgctgtgggtgcgtcgtacagtcaccatgttgccgtcattt 
               
               
                   
                   
                 attgtcattctgatgggattagatccgacacggattctggttatgagtcaggtgctgttaagt 
               
               
                   
                   
                 tttggtatcgccctggcgctggttccactgctgattttcaccagtgacagcaagttgatgggc 
               
               
                   
                   
                 gatctggtgaacagcaaacgcgtaaaacagacaggctgggtgattgtagtgctggtcgtggcg 
               
               
                   
                   
                 ctgaatatctggttgttggtggggacggcgctgggattgtag 
               
               
                   
               
               
                 158 
                 mtnH - 
                 MTNYRVESSSGRAARKMRLALMGPAFIAAIGYIDPGNFATNIQAGASFGYQLLWVVVWANLMA 
               
               
                   
                 
                   Escherichia  
                 
                 MLIQILSAKLGIATGKNLAEQIRDHYPRPVVWFYWVQAEIIAMATDLAEFIGAAIGFKLILGV 
               
               
                   
                 
                   coli 
                 
                 SLLQGAVLTGIATFLILMLQRRGQKPLEKVIGGLLLFVAAAYIVELIFSQPNLAQLGKGMVIP 
               
               
                   
                   
                 SLPTSEAVFLAAGVLGATIMPHVIYLHSSLTQHLHGGSRQQRYSATKWDVAIAMTIAGFVNLA 
               
               
                   
                   
                 MMATAAAAFHFSGHTGVADLDEAYLTLQPLLSHAAATVFGLSLVAAGLSSTVVGTLAGQVVMQ 
               
               
                   
                   
                 GFIRFHIPLWVRRTVTMLPSFIVILMGLDPTRILVMSQVLLSFGIALALVPLLIFTSDSKLMG 
               
               
                   
                   
                 DLVNSKRVKQTGWVIVVLVVALNIWLLVGTALGL