UDP-N-ACETYLMURAMOYL-L-AIANINE:D-GLUTAMATE LIGASE (murD) OF STAPHYLOCOCCUS AUREUS

Abstract: The invention provides murD polypeptides and polynucleotides encoding murD polypeptides and methods for producing such polypeptides by recombinant techniques. Also provided are methods for utilizing murD polypeptides to screen for antibacterial compounds.

Description: "UDP-N-ACETYLMURAM0YL-L-A1ANINE:D-GLUTAMATE LIGASE (MURD) OF STAPHYLOCOCCUS AUREUS. " RELATED APPLICATIONS 5 This application claims benefit of US Provisional Patent Application Number 60/061,064 filed October 3, 1997. FIELD OF THE INVENTION 0 This invention relates to newly identified polynucleotides and polypeptides, and their production and uses, as well as their variants, agonists and antagonists, and their uses. In particular, the invention relates to polynucleotides and polypeptides of the UDP-N- acetylmuramoyl-L-alanine:D-glutamate ligase family, as well as their variants, hereinafter referred to as "murD," "murD polynucleotide(s)," and "murD polypeptide(s)" as the case may be. 5 BACKGROUND OF THE INVENTION It is particularly preferred to employ Staphylococcal genes and gene products as targets for the development of antibiotics. The Staphylococci make up a medically important genera of 0 microbes. They are known to produce two types of disease, invasive and toxigenic. Invasive infections are characterized generally by abscess formation effecting both skin surfaces and deep tissues. S. aureus is the second leading cause of bacteremia in cancer patients. Osteomyelitis, septic arthritis, septic thrombophlebitis and acute bacterial endocarditis are also relatively common. There are at least three clinical conditions resulting from the toxigenic properties of 5 Staphylococci. The manifestation of these diseases result from the actions of exotoxins as opposed to tissue invasion and bacteremia. These conditions include: Staphylococcal food poisoning, scalded skin syndrome and toxic shock syndrome. The frequency of Staphylococcus aureus infections has risen dramatically in the past few decades. This has been attributed to the emergence of multiply antibiotic resistant strains and an 0 increasing population of people with weakened immune systems. It is no longer uncommon to isolate Staphylococcus aureus strains which are resistant to some or all of the standard antibiotics. This phenomenon has created an unmet medical need and demand for new anti-microbial agents, vaccines, drug screening methods, and diagnostic tests for this organism. Moreover, the drug discovery process is currently undergoing a fundamental revolution as it embraces "functional genomics," that is, high throughput genome- or gene-based biology. This approach is rapidly superseding earlier approaches based on "positional cloning" and other methods. Functional genomics relies heavily on the vaπous tools of bioinformatics to identify gene sequences of potential interest from the many molecular biology databases now available as well as from other sources. There is a continuing and significant need to identify and characteπze further genes and other polynucleotides sequences and their related polypeptides, as targets for drug discovery. UDP-N-acetylmuramoylalanme-D-glutamate hgase (D-glutamate adding enzyme) is one of the enzymes involved in the biosynthesis of peptidoglycan. It catalyses the addition of D-glutamate to UDP-N-acetylmuramoyl-L-alanme. This is coupled to the cleavage of ATP into ADP and inorganic phosphate (El-Sherbeim, M., Geissler, W.M., Pittman, J., Yuan, X., Wong, K.K., and Pompliano, D.L. (1998) Cloning and expression of Staphylococcus aureus and Streptococcus pyogenes murD genes encoding undine diphosphate N-acetylmuramoyl- L-alanine: D-glutamate ligases, Gene 210:117-125; Mengin-Lecreulx, D. and van Heyenoort, J. (1990) Nucleotide sequence of the murD gene encoding the UDP-MurNAc-L-Ala-D-Glu synthetase of Escherichia coli Nucleic Acids Research 18:183). Discovery of a Staphylococcus aureus gene encoding a UDP-N-acetylmuramoylalanine-D-glutamate ligase- hke protein which is expressed m vivo implies that there is a role for this protein duπng infection. Clearly, there exists a need for polynucleotides and polypeptides, such as the murD embodiments of the invention, that have a present benefit of, among other things, being useful to screen compounds for antimicrobial activity. Such factors are also useful to determine their role m pathogenesis of infection, dysfunction and disease. There is also a need for identification and characteπzation of such factors and their antagonists and agonists to find ways to prevent, ameliorate or correct such infection, dysfunction and disease. SUMMARY OF THE INVENTION The present mvention relates to murD, m particular murD polypeptides and murD polynucleotides, recombinant materials and methods for their production. In another aspect, the invention relates to methods for using such polypeptides and polynucleotides, including treatment of microbial diseases, amongst others. In a further aspect, the invention relates to methods for identifying agonists and antagonists using the materials provided by the invention, and for treating microbial infections and conditions associated with such infections with the identified agonist or antagonist compounds. In a still further aspect, the invention relaces to diagnostic assays for detecting diseases associated with microbial infections and conditions associated with such infections, such as assays for detecting murD expression or activity. Vaπous changes and modifications within the spiπt and scope of the disclosed invention will become readily apparent to those skilled in the art from reading the following descπptions and from reading the other parts of the present disclosure. DESCRIPTION OF THE INVENTION The mvention relates to murD polypeptides and polynucleotides as descπbed in greater detail below. In particular, the mvention relates to polypeptides and polynucleotides of a murD of Staphylococcus aureus, which is related by ammo acid sequence homology to murD polypeptide. The invention relates especially to murD having the nucleotide and amino acid sequences set out in Table 1 as SEQ ID NO:l or 3 and SEQ ID NO:2 or 4 respectively. Note that sequences recited in the Sequence Listing below as "DNA" represent an exemplification of the invention, since those of ordinary skill will recognize that such sequences can be usefully employed in polynucleotides m general, including πbopolynucleotides. _ TABLE 1 murD Polynucleotide and Polypeptide Sequences (A) Staphylococcus aureus murD polynucleotide sequence [SEQ ID NO:l]. 5 ' - TTCATGGATGGGAAAGANNTATCGCAGGATGNTCATGCAAAAGATTNAGAATNTATTGGTATTTCTGTTG TAAGTGGAAG TCATCCATTAACATTGCTTGATAATAATCCAATAATTGTTAAAAATCTTGGAATACCTTATACAGTATCT AT TAT T GAT G AAGCAGTGAAACGAGGTTTGAANATTTTAACAGAAGTTGAGTTAAGTTATCTAATCTCTGAAGCACCAAT CATAGCTGTA ACGGGTACAAATGGTAAAACGACAGTTACTTCTCTAATTGGAGATATGTTTAAAAAAAGTCGCTTAACTG GAAGATTATC CGGCAATATTGGTTATGTTGCATCTAAAGTAGCACAAGAAGTAAAGCCTACAGATTATTTAGTTACAGAG TTGTCGTCAT TCCAGTTACTTGGAATTGAAAAGTATAAACCACACATTGCTATAATTACTAACATTTATTCGGCGCATCT AGATTACCAT GAAAATTTAGAAAACTATCAAAATGCTAAAAAGCAAATATATAAAAATCAAACGGAAGAAGATTATTTGA TTTGTAATTA TCATCAAAGACAAGTGATAGAGTCGGAAGAATTAAAAGCTAAGACATTGTATTTCTCAACTCAACAAGAA GTTGATGGTA TTTATATTAAAGATGGTTTTATCGTTTATAAAGGTGTTCGTATTATTAACACTGAAGATCTAGTATTGCC TGGTGAACAT AATTTAGAAAATATATTAGCAGCTGTGCTTGCTTGTATTTTAGCTGGTGTACCTATTAAAGCAATTATTG ATAGTTTAAT AACATTTTCAGGAATAGAGCATAGATTGCAATATGTTGGTACTAATAGAACTAATAAATATTATAATGAT TCCAAAGCAA CAAAAACGCAAGCAACACAGTTTGCCTTAAATTCATTTAATCAACCAATCATTTGGTTATGTGGTGGTTT GGATCGAGGG AATGAATTTGACGAACTCATTCCTTATATGGAAAATGTTCGCGCGATGGTTGTATTCGGACAAACGAAAG CTAAGTTTGC TAAACTAGGTAATAGTCAAGGGAAATCGGTCATTGAAGCGAACAATGTCGAAGACGCTGTTGATAAAGTA CAAGATATT TAGAACCAAATGATGTTGTATTATTGTCACCTGCTTGTGCGAGTTGGGATCAATATAGTACTTTTGAAGA GCGTGGAGAG AAATTTATTGAAAGATTCCGTGCCCATTTACCATCTTATTAA-3 1 (B) Staphylococcus aureus murD polypeptide sequence deduced from a polynucleotide sequence in this table [SEQ ID NO:2]. NH 2 - FMDGKXXSQDXHAKDXEXIGISVVSGSHPLTLLDNNPIIVKNLGIPYTVSIIDEAVKRGLXILTEVELSY LISEAPIIAV TGTNGKTTVTSLIGDMFKKSRLTGRLSGNIGYVASKVAQEVKPTDYLVTELSSFQLLGIEKYKPHIAIIT NIYSAHLDYH ENLENYQNAKKQIYKNQTEEDYLICNYHQRQVIESEELKAKTLYFSTQQEVDGIYIKDGFIVYKGVRIIN TEDLVLPGEH NLENILAAVLACILAGVPIKAI I DSLITFSGIEHRLQYVGTNRTNKYYNDSKATKTQATQFALNSFNQPI I LCGGLDRG NEFDELI PYMENVRAMVVFGQTKAKFAKLGNSQGKSVIEANNVEDAVDKVQDI IEPNDVVLLS PACASWD QYSTFEERGE KFIERFRAHLPSY - COOH (C) Staphylococcus aureus murD ORF sequence [SEQ ID NO:3]. 5 ' - TCTCTGAAGCACCAGTCACTAGCTGTAACGGGTACAAATGGTAAAACGACAGTTACTTCTCTAATTGGAG ATATGTTTAA AAAAAGTCGCTTAACTGGAAGATTATCCGGCAATATTGGTTATGTTGCATCTAAAGTAGCACAAGAAGTA AAGCCTACAG ATTATTTAGTTACAGAGTTGTCGTCATTCCAGTTACTTGGAATTGAAAAGTATAAACCACACATTGCTAT AATTACTAAC ATTTATTCGGCGCATCTAGATTACCATGAAAATTTAGAAAACTATCAAAATGCTAAAAAGCAAATATATA AAAATCAAAC GGAAGAAGATTATTTGATTTGTAATTATCATCAAAGACAAGTGATAGAGTCGGAAGAATTAAAAGCTAAG ACATTGTATT TCTCAACTCAACAAGAAGTTGATGGTATTTATATTAAAGATGGTTTTATCGTTTATAAAGGTGTTCGTAT TATTAACACT GAAGATCTAGTATTGCCTGGTGAACATAATTTAGAAAATATATTAGCAGCTGTGCT-3 ' (D) Staphylococcus aureus murD polypeptide sequence deduced from a polynucleotide ORF sequence m this table [SEQ ID NO:4]. NH 2 - SLKHQSLAVTGTNGKTTVTSLIGDMFKKSRLTGRLSGNIGYVASKVAQEVKPTDYLVTELSSFQLLGIEK YKPHIAIITN IYSAHLDYHENLENYQNAKKQIYKNQTEEDYLICNYHQRQVIESEELKAKTLYFSTQQEVDGIYIKDGFI VYKGVRIINT EDLVLPGEHN ENILAAV-COOH Deposited materials A deposit containing a Staphylococcus aureus WCUH 29 strain has been deposited with the National Collections of Industπal and Maπne Bacteπa Ltd. (herein "NCIMB"), 23 St. Machar Dπve, Aberdeen AB2 IRY, Scotland on 11 September 1995 and assigned NCIMB Deposit No. 40771, and referred to as Staphylococcus aureus WCUH29 on deposit. The Staphylococcus aureus strain deposit is referred to herein as "the deposited strain" or as "the DNA of the deposited strain " The deposited strain contains a full length murD gene. The sequence of the polynucleotides contained m the deposited strain, as well as the ammo acid sequence of any polypeptide encoded thereby, are controlling in the event of any conflict with any descπption of sequences herein. The deposit of the deposited strain has been made under the terms of the Budapest Treaty on the International Recognition of the Deposit of Micro-organisms for Purposes of Patent Procedure The deposited strain will be irrevocably and without restriction or condition released to the public upon the issuance of a patent. The deposited strain is provided merely as convenience to those of skill in the art and is not an admission that a deposit is required for enablement, such as that required under 35 U.S.C. §112 A license may be required to make, use or sell the deposited strain, and compounds deπved therefrom, and no such license is hereby granted. In one aspect of the invention there is provided an isolated nucleic acid molecule encoding a mature polypeptide expressible by the Staphylococcus aureus WCUH 29 strain, which polypeptide is contained in the deposited strain. Further provided by the invention are murD polynucleotide sequences m the deposited strain, such as DNA and RNA, and amino acid sequences encoded thereby. Also provided by the invention are murD polypeptide and polynucleotide sequences isolated from the deposited strain. Polypeptides MurD polypeptide of the invention is substantially phylogenetically related to other proteins of the UDP-N-acetylmuramoyl-L-alanine'D-glutamate hgase family. In one aspect of the invention there are provided polypeptides of Staphylococcus aureus referred to herein as "murD" and "murD polypeptides" as well as biologically, diagnostically, prophylactically, clinically or therapeutically useful vaπants thereof, and compositions compπsing the same. Among the particularly preferred embodiments of the invention are vaπants of murD polypeptide encoded by naturally occurπng alleles of the murD gene. The present invention further provides for an isolated polypeptide which: (a) compπses or consists of an ammo acid sequence which has at least 70% identity, preferably at least 80% identity, more preferably at least 90% identity, yet more preferably at least 95% identity, most preferably at least 97-99% or exact identity, to that of SEQ ID NO.2 over the entire length of SEQ ID NO.2; (b) a polypeptide encoded by an isolated polynucleotide comprising or consisting of a polynucleotide sequence which has at least 70% identity, preferably at least 80% identity, more preferably at least 90% identity, yet more preferably at least 95% identity, even more preferably at least 97-99% or exact identity to SEQ ID NO: 1 over the entire length of SEQ ID NO: l; (c) a polypeptide encoded by an isolated polynucleotide comprising or consisting of a polynucleotide sequence encoding a polypeptide which has at least 70% identity, preferably at least 80% identity, more preferably at least 90%> identity, yet more preferably at least 95%o identity, even more preferably at least 97-99% or exact identity, to the ammo acid sequence of SEQ ID NO:2, over the entire length of SEQ ID NO:2; or (d) a polypeptide encoded by an isolated polynucleotide comprising or consisting of a polynucleotide sequence which has at least 70% identity, preferably at least 80% identity, more preferably at least 90% identity, yet more preferably at least 95% identity, even more preferably at least 97-99% or exact identity, to SEQ ID NO. l over the entire length of SEQ ID NO:3; (e) a polypeptide encoded by an isolated polynucleotide comprising or consisting of a polynucleotide sequence which has at least 70% identity, preferably at least 80% identity, more preferably at least 90% identity, yet more preferably at least 95% identity, even more preferably at least 97-99% or exact identity to SEQ ID NO:3 over the entire length of SEQ ID NO:3; or (f) a polypeptide encoded by an isolated polynucleotide comprising or consisting of a polynucleotide sequence encoding a polypeptide which has at least 70% identity, preferably at least 80% identity, more preferably at least 90%) identity, yet more preferably at least 95% identity, even more preferably at least 97- 99% or exact identity, to the ammo acid sequence of SEQ ID NO:4, over the entire length of SEQ ID NO:4; (g) comprises or consists of an ammo acid sequence which has at least 70% > identity, preferably at least 80% identity, more preferably at least 90% identity, yet more preferably at least 95%> identity, most preferably at least 97-99% or exact identity, to the ammo acid sequence of SEQ ID NO'4 over the entire length of SEQ ID NO:4. The compaπsons of percent identity with respect to SEQ ID NO:4 can alternately be with respect contiguous fragments, preferably contiguous fragments showing a biological activity, for instance a fragment initiated from an artificial start codon of a polynucleotide of the invention or from an ATG codon present m such a polynucleotide, such as that encoding residue 96 of SEQ ID NO:4. The polypeptides of the invention include a polypeptide of Table 1 [SEQ ID NO:2 or 4] (in particular the mature polypeptide) as well as polypeptides and fragments, particularly those which have the biological activity of murD, and also those which have at least 70% identity to a polypeptide of Table 1 [SEQ ID NO:l or 3]or the relevant portion, preferably at least 80% identity to a polypeptide of Table 1 [SEQ ID NO:2 or 4and more preferably at ieast 90% identity to a polypeptide of Table 1 [SEQ ID NO:2 or 4] and still more preferably at least 95% identity to a polypeptide of Table 1 [SEQ ID NO: 2 or 4] and also include portions of such polypeptides with such portion of the polypeptide generally containing at least 30 ammo acids and more preferably at least 50 ammo acids. The mvention also includes a polypeptide consisting of or compπsing a polypeptide of the formula: X-(R 1 ) m -(R 2 )-(R 3 ) n -Y wherein, at the ammo terminus, X is hydrogen, a metal or any other moiety descπbed herein for modified polypeptides, and at the carboxyl terminus, Y is hydrogen, a metal or any other moiety descπbed herein for modified polypeptides, Ri and R3 are any ammo acid residue or modified ammo acid residue, m is an integer between 1 and 1000 or zero, n is an integer between 1 and 1000 or zero, and R 2 is an amino acid sequence of the invention, particularly an ammo acid sequence selected from Table 1 or modified forms thereof. In the formula above, R 2 is oπented so that its ammo terminal amino acid residue is at the left, covalently bound to R1 and its carboxy terminal ammo acid residue is at the πght, covalently bound to R3. Any stretch of amino acid residues denoted by either R1 or R3, where m and or n is greater than 1, may be either a heteropolymer or a homopolymer, preferably a heteropolymer. Other preferred embodiments of the mvention are provided where m is an integer between 1 and 50, 100 or 500, and n is an integer between 1 and 50, 100, or 500. It is most preferred that a polypeptide of the invention is deπved from Staphylococcus aureus, however, it may preferably be obtained from other organisms of the same taxonomic genus. A polypeptide of the invention may also be obtained, for example, from organisms of the same taxonomic family or order. A fragment is a vaπant polypeptide having an ammo acid sequence that is entirely the same as part but not all of any ammo acid sequence of any polypeptide of the mvention. As with murD polypeptides, fragments may be "free-standmg," or compπsed within a larger polypeptide of which they form a part or region, most preferably as a single continuous region m a single larger polypeptide. Preferred fragments include, for example, truncation polypeptides having a portion of an ammo acid sequence of Table 1 [SEQ ID NO:2 or 4], or of vaπants thereof, such as a continuous seπes of residues that includes an ammo- and/or carboxyl-terminal amino acid sequence. Degradation forms of the polypeptides of the invention produced by or m a host cell, particularly a Staphylococcus aureus, are also preferred Further preferred are fragments charactenzed by structural or functional attributes such as fragments that compnse alpha-helix and alpha-helix forming regions, beta-sheet and beta-sheet-formmg regions, turn and turn-formmg regions, coil and coil-form g regions, hydrophihc regions, hydrophobic regions, alpha amphipathic regions, beta amphipathic regions, flexible regions, surface-forming regions, substrate binding region, and high antigenic index regions. Further preferred fragments include an isolated polypeptide comprising an amino acid sequence having at least 15, 20, 30, 40, 50 or 100 contiguous amino acids from the amino acid sequence of SEQ ID NO.2, or an isolated polypeptide comprising an amino acid sequence having at least 15, 20, 30, 40, 50 or 100 contiguous amino acids truncated or deleted from the amino acid sequence of SEQ ID NO:2. Also preferred are biologically active fragments which are those fragments that mediate activities of murD, including those with a similar activity or an improved activity, or with a decreased undesirable activity. Also included are those fragments that are antigenic or immunogenic m an animal, especially in a human. Particularly preferred are fragments compπsing receptors or domains of enzymes that confer a function essential for viability of Staphylococcus aureus or the ability to initiate, or maintain cause Disease m an individual, particularly a human. Fragments of the polypeptides of the mvention may be employed for producing the corresponding full-length polypeptide by peptide synthesis; therefore, these vaπants may be employed as intermediates for producing the full-length polypeptides of the invention. In addition to the standard single and triple letter representations for ammo acids, the term "X" or "Xaa" may also be used in describing certain polypeptides of the invention. "X" and "Xaa" mean that any of the twenty naturally occurring ammo acids may appear at such a designated position in the polypeptide sequence. Polynucleotides It is an object of the invention to provide polynucleotides that encode murD polypeptides, particularly polynucleotides that encode the polypeptide herein designated murD. In a particularly preferred embodiment of the invention the polynucleotide compπses a region encoding murD polypeptides compπsing a sequence set out m Table 1 [SEQ ID NO.l or 3] which includes a full length gene, or a variant thereof. The Applicants believe that this full length gene is essential to the growth and/or survival of an organism which possesses it, such as Staphylococcus aureus. As a further aspect of the mvention there are provided isolated nucleic acid molecules encoding and/or expressing murD polypeptides and polynucleotides, particularly Staphylococcus aureus murD polypeptides and polynucleotides, including, for example, unprocessed RNAs, πbozyme RNAs, mRNAs, cDNAs, genomic DNAs, B- and Z-DNAs Further embodiments of the mvention include biologically, diagnostically, prophylactically, clinically or therapeutically useful polynucleotides and polypeptides, and vaπants thereof, and compositions comprising the same. Another aspect of the invention relates to isolated polynucleotides, including at least one full length gene, that encodes a murD polypeptide having a deduced ammo acid sequence of Table 1 [SEQ ID NO:2 or 4] and polynucleotides closely related thereto and vanants thereof. In another particularly preferred embodiment of the invention there is a murD polypeptide from Staphylococcus aureus comprising or consisting of an ammo acid sequence of Table 1 [SEQ ID NO:2 or 4], or a vanant thereof. Using the information provided herein, such as a polynucleotide sequence set out in Table 1 [SEQ ID NO:l or 3], a polynucleotide of the invention encodmg murD polypeptide may be obtained using standard cloning and screening methods, such as those for cloning and sequencing chromosomal DNA fragments from bacteπa using Staphylococcus aureus WCUH 29 cells as starting matenal, followed by obtaining a full length clone. For example, to obtain a polynucleotide sequence of the invention, such as a polynucleotide sequence given in Table 1 [SEQ ID NO: l or 3], typically a library of clones of chromosomal DNA of Staphylococcus aureus WCUH 29 in E.coli or some other suitable host is probed with a radiolabeled oligonucleotide, preferably a 17-mer or longer, deπved from a partial sequence. Clones carrying DNA identical to that of the probe can then be distinguished using stringent hybridization conditions. By sequencing the individual clones thus identified by hybπdization with sequencing primers designed from the ongmal polypeptide or polynucleotide sequence it is then possible to extend the polynucleotide sequence m both directions to determine a full length gene sequence. Conveniently, such sequencing is performed, for example, using denatured double stranded DNA prepared from a plasmid clone. Suitable techniques are described by Mamatis, T, Fπtsch, E.F. and Sambrook et al, MOLECULAR CLONING, A LABORATORY MANUAL, 2nd Ed.; Cold Spnng Harbor Laboratory Press, Cold Spnng Harbor, New York (1989). (see m particular Screening By Hybridization 1.90 and Sequencing Denatured Double-Stranded DNA Templates 13.70). Direct genomic DNA sequencing may also be performed to obtain a full length gene sequence. Illustrative of the invention, each polynucleotide set out in Table 1 [SEQ ID NO:l or 3] was discovered in a DNA library deπved from Staphylococcus aureus WCUH 29. Moreover, each DNA sequence set out in Table 1 [SEQ ID NO: 1 or 3] contains an open reading frame encoding a protein having about the number of ammo acid residues set forth in Table 1 [SEQ ID NO:2 or 4] with a deduced molecular weight that can be calculated using ammo acid residue molecular weight values well known to those skilled m the art. The polynucleotide of SEQ ID NO:l, between nucleotide number 1 and the stop codon which begins at nucleotide number 1240 of SEQ ID NO: 1, encodes the polypeptide of SEQ ID NO:2. In a further aspect, the present invention provides for an isolated polynucleotide comprising or consisting of: (a) a polynucleotide sequence which has at least 70% identity, preferably at least 80%> identity, more preferably at least 90% identity, yet more preferably at least 95%> identity, even more preferably at least 97-99% or exact identity to SEQ ID NO:l over the entire length of SEQ ID NO:l; (b) a polynucleotide sequence encoding a polypeptide which has at least 70% identity, preferably at least 80%> identity, more preferably at least 90% identity, yet more preferably at least 95%> identity, even more preferably at least 97-99% or 100% exact, to the amino acid sequence of SEQ ID NO:2, over the entire length of SEQ ID NO:2; or (c) a nucleotide sequence which has at least 70%> identity, preferably at least 80% identity, more preferably at least 90% identity, yet more preferably at least 95% identity, even more preferably at least 97-99%> or 100% identity, to SEQ ID NO: l over the entire length of SEQ ID NO:3; (d) a nucleotide sequence which has at least 70% identity, preferably at least 80% identity, more preferably at least 90% identity, yet more preferably at least 95% identity, even more preferably at least 97-99% or exact identity to SEQ ID NO:3 over the entire length of SEQ ID NO:3; or (e) a polynucleotide sequence encoding a polypeptide which has at least 70% identity, preferably at least 80% identity, more preferably at least 90% identity, yet more preferably at least 95% identity, even more preferably at least 97-99% or exact identity, to the amino acid sequence of SEQ ID NO:4, over the entire length of SEQ ID NO:4. As above, the compaπsons of percent identity with respect to polynucleotides- encoding SEQ ID NO 4 can alternately be with respect contiguous fragments, preferably contiguous fragments encoding polypeptides showing a biological activity, for instance a fragment initiated from an artificial start codon of a polynucleotide of the invention or from an ATG codon present in such a polynucleotide, such as that encodmg residue 96 of SEQ ID NO:4. A polynucleotide encoding a polypeptide of the present invention, including homologs and orthologs from species other than Staphylococcus aureus, may be obtained by a process which comprises the steps of screening an appropriate library under stπngent hybπdization conditions with a labeled or detectable probe consisting of or compπsing the sequence of SEQ ID NO:l or 3 or a fragment thereof; and isolating a full-length gene and/or genomic clones containing said polynucleotide sequence The invention provides a polynucleotide sequence identical over its entire length to a coding sequence (open reading frame) in Table 1 [SEQ ID NO:l or 3]. Also provided by the invention is a coding sequence for a mature polypeptide or a fragment thereof, by itself as well as a coding sequence for a mature polypeptide or a fragment in reading frame with another coding sequence, such as a sequence encoding a leader or secretory sequence, a pre-, or pro- or prepro- protem sequence. The polynucleotide of the invention may also contain at least one non-codmg sequence, including for example, but not limited to at least one non-codmg 5' and 3' sequence, such as the transcπbed but non-translated sequences, termination signals (such as rho-dependent and rho-independent termination signals), nbosome binding sites, Kozak sequences, sequences that stabilize mRNA, mtrons, and polyadenylation signals. The polynucleotide sequence may also compnse additional coding sequence encodmg additional ammo acids. For example, a marker sequence that facilitates puπfication of the fused polypeptide can be encoded. In certain embodiments of the invention, the marker sequence is a hexa-histidme peptide, as provided in the pQE vector (Qiagen, Inc.) and descπbed in Gentz et al, Proc. Natl. Acad. Sci., USA 86. 821-824 (1989), or an HA peptide tag (Wilson et al, Cell 37. 767 (1984), both of which may be useful in purifying polypeptide sequence fused to them. Polynucleotides of the invention also include, but are not limited to, polynucleotides compπsing a structural gene and its naturally associated sequences that control gene expression. A preferred embodiment of the invention is a polynucleotide of consisting of or compπsing nucleotide 1 to the nucleotide immediately upstream of or including nucleotide 1240 set forth in SEQ ID NO:l of Table 1, both of which encode the murD polypeptide. The invention also includes a polynucleotide consisting of or comprising a polynucleotide of the formula: X-(R 1 ) m -(R 2 )-(R 3 ) n -Y wherein, at the 5' end of the molecule, X is hydrogen, a metal or a modified nucleotide residue, or together with Y defines a covalent bond, and at the 3' end of the molecule, Y is hydrogen, a metal, or a modified nucleotide residue, or together with X defines the covalent bond, each occuπence of Rj and R3 is independently any nucleic acid residue or modified nucleic acid residue, m is an integer between 1 and 3000 or zero , n is an integer between 1 and 3000 or zero, and R 2 is a nucleic acid sequence or modified nucleic acid sequence of the invention, particularly a nucleic acid sequence selected from Table 1 or a modified nucleic acid sequence thereof. In the polynucleotide formula above, R 2 is oriented so that its 5' end nucleic acid residue is at the left, bound to R^ and its 3' end nucleic acid residue is at the right, bound to R3. Any stretch of nucleic acid residues denoted by either Rj and/or R 2 , where m and or n is greater than 1 , may be either a heteropolymer or a homopolymer, preferably a heteropolymer. Where, in a preferred embodiment, X and Y together define a covalent bond, the polynucleotide of the above formula is a closed, circular polynucleotide, which can be a double-stranded polynucleotide wherein the formula shows a first strand to which the second strand is complementary. In another preferred embodiment m and/or n is an integer between 1 and 1000. Other preferred embodiments of the invention are provided where m is an integer between 1 and 50, 100 or 500, and n is an integer between 1 and 50, 100, or 500. It is most preferred that a polynucleotide of the invention is deπved from Staphylococcus aureus, however, it may preferably be obtained from other organisms of the same taxonomic genus. A polynucleotide of the mvention may also be obtained, for example, from organisms of the same taxonomic family or order. The term "polynucleotide encoding a polypeptide" as used herein encompasses polynucleotides that include a sequence encoding a polypeptide of the invention, particularly a bacteπal polypeptide and more particularly a polypeptide of the Staphylococcus aureus murD having an ammo acid sequence set out m Table 1 [SEQ ID NO:2 or 4]. The term also encompasses polynucleotides that include a single continuous region or discontinuous regions encodmg the polypeptide (for example, polynucleotides interrupted by integrated phage, an integrated insertion sequence, an integrated vector sequence, an integrated transposon sequence, or due to RNA editing or genomic DNA reorganization) together with additional regions, that also may contain coding and or non-codmg sequences. The invention further relates to vanants of the polynucleotides descπbed herein that encode variants of a polypeptide having a deduced amino acid sequence of Table 1 [SEQ ID NO: 2 or 4]. Fragments of a polynucleotides of the mvention may be used, for example, to synthesize full-length polynucleotides of the invention. Further particularly preferred embodiments are polynucleotides encoding murD vaπants, that have the amino acid sequence of murD polypeptide of Table 1 [SEQ ID NO.2 or 4] in which several, a few, 5 to 10, 1 to 5, 1 to 3, 2, 1 or no amino acid residues are substituted, modified, deleted and/or added, in any combination. Especially preferred among these are silent substitutions, additions and deletions, that do not alter the properties and activities of murD polypeptide. Further preferred embodiments of the invention are polynucleotides that are at least 70% identical over their entire length to a polynucleotide encodmg murD polypeptide having an ammo acid sequence set out m Table 1 [SEQ ID NO:2 or 4], and polynucleotides that are complementary to such polynucleotides. Alternatively, most highly preferred are polynucleotides that compnse a region that is at least 80% identical over its entire length to a polynucleotide encoding murD polypeptide and polynucleotides complementary thereto. In this regard, polynucleotides at least 90% identical over their entire length to the same are particularly preferred, and among these particularly preferred polynucleotides, those with at least 95% are especially preferred. Furthermore, those with at least 97% are highly preferred among those with at least 95%, and among these those with at least 98% and at least 99% are particularly highly preferred, with at least 99% being the more preferred. Preferred embodiments are polynucleotides encodmg polypeptides that retain substantially the same biological function or activity as the mature polypeptide encoded by a DNA of Table 1 [SEQ ID NO: 1 or 3]. In accordance with certain preferred embodiments of this mvention there are provided polynucleotides that hybπdize, particularly under stπngent conditions, to murD polynucleotide sequences, such as those polynucleotides in Table 1. The invention further relates to polynucleotides that hybridize to the polynucleotide sequences provided herein. In this regard, the invention especially relates to polynucleotides that hybπdize under stπngent conditions to the polynucleotides descπbed herein. As herein used, the terms "stringent conditions" and "stπngent hybndization conditions" mean hybridization occurring only if there is at least 95% and preferably at least 97% identity between the sequences A specific example of stringent hybridization conditions is overnight incubation at 42°C in a solution comprising: 50% formamide, 5x SSC (150mM NaCl, 15mM tπsodium citrate), 50 mM sodium phosphate (pH7.6), 5x Denhardt's solution, 10% dextran sulfate, and 20 micrograms/ml of denatured, sheared salmon sperm DNA, followed by washing the hybridization support in O.lx SSC at about 65°C. Hybridization and wash conditions are well known and exemplified m Sambrook, et al., Molecular Cloning: A Laboratory Manual, Second Edition, Cold Spring Harbor, N.Y, (1989), particularly Chapter 11 therein. Solution hybridization may also be used with the polynucleotide sequences provided by the invention. The invention also provides a polynucleotide consisting of or comprising a polynucleotide sequence obtained by screening an appropriate library containing the complete gene for a polynucleotide sequence set forth in SEQ ID NO:l or 3 under stringent hybridization conditions with a probe having the sequence of said polynucleotide sequence set forth in SEQ ID NO:l or 3 or a fragment thereof; and isolating said polynucleotide sequence. Fragments useful for obtaining such a polynucleotide include, for example, probes and primers fully described elsewhere herein. As discussed elsewhere herein regarding polynucleotide assays of the invention, for instance, the polynucleotides of the mvention, may be used as a hybndization probe for RNA, cDNA and genomic DNA to isolate full-length cDNAs and genomic clones encoding murD and to isolate cDNA and genomic clones of other genes that have a high identity, particularly high sequence identity, to the murD gene. Such probes generally will compnse at least 15 nucleotide residues or base pairs. Preferably, such probes will have at least 30 nucleotide residues or base pairs and may have at least 50 nucleotide residues or base pairs. Particularly preferred probes will have at least 20 nucleotide residues or base pairs and will have lee than 30 nucleotide residues or base pairs. A coding region of a murD gene may be isolated by screening using a DNA sequence provided in Table 1 [SEQ ID NO: l or 3] to synthesize an oligonucleotide probe. A labeled oligonucleotide having a sequence complementary to that of a gene of the mvention is then used to screen a library of cDNA, genomic DNA or mRNA to determine which members of the library the probe hybπdizes to. There are several methods available and well known to those skilled m the art to obtain full-length DNAs, or extend short DNAs, for example those based on the method of Rapid Amplification of cDNA ends (RACE) (see, for example, Frohman, et al, PNAS USA 85 8998- 9002, 1988). Recent modifications of the technique, exemplified by the Marathon™ technology (Clontech Laboratories Inc.) for example, have significantly simplified the search for longer cDNAs. In the Marathon™ technology, cDNAs have been prepared from mRNA extracted from a chosen tissue and an 'adaptor' sequence ligated onto each end. Nucleic acid amplification (PCR) is then carried out to amplify the "missing" 5' end of the DNA using a combination of gene specific and adaptor specific oligonucleotide primers. The PCR reaction is then repeated using "nested" primers, that is, primers designed to anneal within the amplified product (typically an adaptor specific primer that anneals further 3' in the adaptor sequence and a gene specific primer that anneals further 5' in the selected gene sequence). The products of this reaction can then be analyzed by DNA sequencing and a full-length DNA constructed either by joining the product directly to the existing DNA to give a complete sequence, or carrying out a separate full-length PCR using the new sequence information for the design of the 5' primer. The polynucleotides and polypeptides of the invention may be employed, for example, as research reagents and mateπals for discovery of treatments of and diagnostics for diseases, particularly human diseases, as further discussed herein relating to polynucleotide assays. The polynucleotides of the invention that are oligonucleotides derived from a sequence of Table 1 [SEQ ID NOS: 1 or 2 or 3 or 4] may be used in the processes herein as described, but preferably for PCR, to determine whether or not the polynucleotides identified herein in whole or in part are transcribed in bacteria in infected tissue. It is recognized that such sequences will also have utility in diagnosis of the stage of infection and type of infection the pathogen has attained. The invention also provides polynucleotides that encode a polypeptide that is the mature protein plus additional amino or carboxyl-termmal ammo acids, or ammo acids mteπor to the mature polypeptide (when the mature form has more than one polypeptide chain, for instance). Such sequences may play a role in processing of a protein from precursor to a mature form, may allow protein transport, may lengthen or shorten protein half-life or may facilitate manipulation of a protein for assay or production, among other things. As generally is the case in vivo, the additional ammo acids may be processed away from the mature protein by cellular enzymes. For each and every polynucleotide of the invention there is provided a polynucleotide complementary to it It is preferred that these complementary polynucleotides are fully complementary to each polynucleotide with which they are complementary. A precursor protein, having a mature form of the polypeptide fused to one or more prosequences may be an inactive form of the polypeptide. When prosequences are removed such inactive precursors generally are activated Some or all of the prosequences may be removed before activation. Generally, such precursors are called proproteins. In addition to the standard A, G, C, T/U representations for nucleotides, the term "N" may also be used m describing certain polynucleotides of the invention. "N" means that any of the four DNA or RNA nucleotides may appear at such a designated position in the DNA or RNA sequence, except it is preferred that N is not a nucleic acid that when taken in combination with adjacent nucleotide positions, when read in the correct reading frame, would have the effect of generating a premature termination codon in such reading frame. In sum, a polynucleotide of the invention may encode a mature protein, a mature protein plus a leader sequence (which may be referred to as a preprotein), a precursor of a mature protein having one or more prosequences that are not the leader sequences of a preprotein, or a preproprotem, which is a precursor to a proprotem. having a leader sequence and one or more prosequences, which generally are removed dunng processing steps that produce active and mature forms of the polypeptide. Vectors, Host Cells, Expression Systems The mvention also relates to vectors that compnse a polynucleotide or polynucleotides of the mvention, host cells that are genetically engineered with vectors of the invention and the production of polypeptides of the invention by recombinant techniques. Cell-free translation systems can also be employed to produce such proteins using RNAs denved from the DNA constructs of the invention. Recombinant polypeptides of the present mvention may be prepared by processes well known in those skilled m the art from genetically engineered host cells compπsing expression systems. Accordingly, a further aspect, the present mvention relates to expression systems which compnse a polynucleotide or polynucleotides of the present invention, to host cells which are genetically engineered with such expression systems, and to the production of polypeptides of the mvention by recombinant techniques. For recombinant production of the polypeptides of the mvention, host cells can be genetically engineered to incorporate expression systems or portions thereof or polynucleotides of the invention. Introduction of a polynucleotide into the host cell can be effected by methods described m many standard laboratory manuals, such as Davis, et al , BASIC METHODS IN MOLECULAR BIOLOGY, (1986) and Sambrook, et al, MOLECULAR CLONING A LABORATORY MANUAL, 2nd Ed, Cold Spnng Harbor Laboratory Press, Cold Spnng Harbor, N Y. (1989), such as, calcium phosphate transfection, DEAE-dextran mediated transfection, transvection, micromjection, cationic hpid-mediated transfection, electroporation, transduction, scrape loading, ballistic introduction and infection. Representative examples of appropnate hosts include bacteπal cells, such as cells of streptococci, staphylococci, enterococci E. coli, streptomyces, cyanobactena, Bacillus subtihs, and Staphylococcus aureus; fungal cells, such as cells of a yeast, Kluveromyces, Saccharomyces, a basidiomycete, Candida albicans and Aspergillus; insect cells such as cells of Drosophila S2 and Spodoptera Sf9; animal cells such as CHO, COS, HeLa, C127, 3T3, BHK, 293, CV-1 and Bowes melanoma cells; and plant cells, such as cells of a gymnosperm or angiosperm. A great vanety of expression systems can be used to produce the polypeptides of the mvention. Such vectors include, among others, chromosomal-, episomal- and virus-denved vectors, for example, vectors denved from bactenal plasmids, from bacteπophage, from transposons, from yeast episomes, from insertion elements, from yeast chromosomal elements, from viruses such as baculoviruses, papova viruses, such as SV40, vaccinia viruses, adenoviruses, fowl pox viruses, pseudorabies viruses, picornaviruses and retroviruses, and vectors denved from combinations thereof, such as those deπved from plasmid and bacteπophage genetic elements, such as cosmids and phagemids. The expression system constructs may contain control regions that regulate as well as engender expression Generally, any system or vector suitable to maintain, propagate or express polynucleotides and or to express a polypeptide m a host may be used for expression in this regard. The appropnate DNA sequence may be inserted into the expression system by any of a vanety of well-known and routine techniques, such as, for example, those set forth in Sambrook et al, MOLECULAR CLONING, A LABORATORY MANUAL, {supra). In recombinant expression systems in eukaryotes, for secretion of a translated protein into the lumen of the endoplasmic reticulum, into the peπplasmic space or into the extracellular environment, appropnate secretion signals may be incorporated into the expressed polypeptide. These signals may be endogenous to the polypeptide or they may be heterologous signals. Polypeptides of the invention can be recovered and punfied from recombinant cell cultures by well-known methods including ammonium sulfate or ethanol precipitation, acid extraction, amon or cation exchange chromatography, phosphocellulose chromatography, hydrophobic interaction chromatography, affinity chromatography, hydroxylapatite chromatography, and lectin chromatography. Most preferably, high performance liquid chromatography is employed for puπfication. Well known techniques for refolding protein may be employed to regenerate active conformation when the polypeptide is denatured dunng isolation and or punfication. Diagnostic, Prognostic, Serotvping and Mutation Assays This invention is also related to the use of murD polynucleotides and polypeptides of the invention for use as diagnostic reagents. Detection of murD polynucleotides and/or polypeptides in a eukaryote, particularly a mammal, and especially a human, will provide a diagnostic method for diagnosis of disease, staging of disease or response of an infectious organism to drugs. Eukaryotes, particularly mammals, and especially humans, particularly those infected or suspected to be infected with an organism compnsing the murD gene or protein, may be detected at the nucleic acid or amino acid level by a vanety of well known techniques as well as by methods provided herein. Polypeptides and polynucleotides for prognosis, diagnosis or other analysis may be obtained from a putatively infected and/or infected individual's bodily matenals. Polynucleotides from any of these sources, particularly DNA or RNA, may be used directly for detection or may be amplified enzymatically by using PCR or any other amplification technique pπor to analysis. RNA, particularly mRNA, cDNA and genomic DNA may also be used m the same ways. Using amplification, charactenzation of the species and strain of infectious or resident organism present in an individual, may be made by an analysis of the genotype of a selected polynucleotide of the organism. Deletions and insertions can be detected by a change in size of the amplified product in compaπson to a genotype of a reference sequence selected from a related organism, preferably a different species of the same genus or a different strain of the same species. Point mutations can be identified by hybndizing amplified DNA to labeled murD polynucleotide sequences. Perfectly or significantly matched sequences can be distinguished from imperfectly or more significantly mismatched duplexes by DNase or RNase digestion, for DNA or RNA respectively, or by detecting differences in melting temperatures or renaruration kinetics. Polynucleotide sequence differences may also be detected by alterations in the electrophoretic mobility of polynucleotide fragments in gels as compared to a reference sequence. This may be carried out with or without denaturing agents. Polynucleotide differences may also be detected by direct DNA or RNA sequencing. See, for example, Myers et al, Science, 230: 1242 (1985). Sequence changes at specific locations also may be revealed by nuclease protection assays, such as RNase, VI and SI protection assay or a chemical cleavage method. See, for example, Cotton et al, Proc. Natl. Acad. Sci., USA, 85: 4397-4401 (1985). In another embodiment, an array of oligonucleotides probes comprising murD nucleotide sequence or fragments thereof can be constructed to conduct efficient screening of, for example, genetic mutations, serotype, taxonomic classification or identification. Array technology methods are well known and have general applicability and can be used to address a variety of questions in molecular genetics including gene expression, genetic linkage, and genetic variability (see, for example, Chee et al, Science, 274: 610 (1996)). Thus in another aspect, the present invention relates to a diagnostic kit which comprises: (a) a polynucleotide of the present invention, preferably the nucleotide sequence of SEQ ID NO:l or 3, or a fragment thereof ; (b) a nucleotide sequence complementary to that of (a); (c) a polypeptide of the present invention, preferably the polypeptide of SEQ ID NO:2 or 4 or a fragment thereof; or (d) an antibody to a polypeptide of the present invention, preferably to the polypeptide of SEQ ID NO:2 or 4. It will be appreciated that in any such kit, (a), (b), (c) or (d) may comprise a substantial component. Such a kit will be of use in diagnosing a disease or susceptibility to a Disease, among others. This invention also relates to the use of polynucleotides of the present invention as diagnostic reagents. Detection of a mutated form of a polynucleotide of the invention, preferable, SEQ ID NO: 1 or 3, which is associated with a disease or pathogenicity will provide a diagnostic tool that can add to, or define, a diagnosis of a disease, a prognosis of a course of disease, a determination of a stage of disease, or a susceptibility to a disease, which results from under- expression, over-expression or altered expression of the polynucleotide. Organisms, particularly infectious organisms, carrying mutations in such polynucleotide may be detected at the polynucleotide level by a variety of techniques, such as those described elsewhere herein. The nucleotide sequences of the present mvention are also valuable for organism chromosome identification. The sequence is specifically targeted to, and can hybndize with, a particular location on an organism's chromosome, particularly to a Staphylococcus aureus chromosome. The mapping of relevant sequences to chromosomes according to the present invention may be an important step in correlating those sequences with pathogenic potential and/or an ecological niche of an organism and/or drug resistance of an organism, as well as the essentiality of the gene to the organism. Once a sequence has been mapped to a precise chromosomal location, the physical position of the sequence on the chromosome can be correlated with genetic map data. Such data may be found on-lme a sequence database. The relationship between genes and diseases that have been mapped to the same chromosomal region are then identified through known genetic methods, for example, through linkage analysis (comheπtance of physically adjacent genes) or mating studies, such as by conjugation. The differences in a polynucleotide and or polypeptide sequence between organisms possessing a first phenotype and organisms possessing a different, second different phenotype can also be determined. If a mutation is observed m some or all organisms possessing the first phenotype but not in any organisms possessing the second phenotype, then the mutation is likely to be the causative agent of the first phenotype. Cells from an organism carrying mutations or polymoφhisms (allelic vanations) in a polynucleotide and/or polypeptide of the mvention may also be detected at the polynucleotide or polypeptide level by a vanety of techniques, to allow for serotypmg, for example. For example, RT-PCR can be used to detect mutations m the RNA. It is particularly preferred to use RT-PCR conjunction with automated detection systems, such as, for example, GeneScan. RNA, cDNA or genomic DNA may also be used for the same purpose, PCR. As an example, PCR pnmers complementary to a polynucleotide encodmg murD polypeptide can be used to identify and analyze mutations. Examples of representative pnmers are shown below Table 2. Table 2 Primers for amplification of murD polynucleotides SEQ ID NO PRIMER SEQUENCE 5'-AACGGAAGAAGATTATTTGATTTG-3' 5'-ACCGATTTCCCTTGACTATTACC-3' The invention also includes pnmers of the formula: X-(R 1 ) m -(R 2 )-(R 3 ) n -Y wherein, at the 5' end of the molecule, X is hydrogen, a metal or a modified nucleotide residue, and at the 3' end of the molecule, Y is hydrogen, a metal or a modified nucleotide residue, Ri and R3 are any nucleic acid residue or modified nucleotide residue, m is an integer between 1 and 20 or zero , n is an integer between 1 and 20 or zero, and R 2 is a pnmer sequence of the mvention, particularly a pπmer sequence selected from Table 2. In the polynucleotide formula above R is oπented so that its 5' end nucleotide residue is at the left, bound to Ri and its 3' end nucleotide residue is at the right, bound to R3 Any stretch of nucleic acid residues denoted by either R group, where m and or n is greater than 1, may be either a heteropolymer or a homopolymer, preferably a heteropolymer being complementary to a region of a polynucleotide of Table 1. In a preferred embodiment m and/or n is an integer between 1 and 10. The invention further provides these pnmers with 1 , 2, 3 or 4 nucleotides removed from the 5' and/or the 3' end. These pnmers may be used for, among other things, amplifying murD DNA and/or RNA isolated from a sample denved from an individual, such as a bodily matenal. The pnmers may be used to amplify a polynucleotide isolated from an infected individual, such that the polynucleotide may then be subject to vanous techniques for elucidation of the polynucleotide sequence. In this way, mutations in the polynucleotide sequence may be detected and used to diagnose and or prognose the infection or its stage or course, or to serotype and/or classify the infectious agent. The invention further provides a process for diagnosing, disease, preferably bacterial infections, more preferably infections caused by Staphylococcus aureus, comprising determining from a sample derived from an individual, such as a bodily material, an increased level of expression of polynucleotide having a sequence of Table 1 [SEQ ID NO: l or 3]. Increased or decreased expression of a murD polynucleotide can be measured using any on of the methods well known in the art for the quantitation of polynucleotides, such as, for example, amplification, PCR, RT-PCR, RNase protection, Northern blotting, spectrometry and other hybridization methods In addition, a diagnostic assay m accordance with the invention for detecting over- expression of murD polypeptide compared to normal control tissue samples may be used to detect the presence of an infection, for example Assay techniques that can be used to determine levels of a murD polypeptide, m a sample denved from a host, such as a bodily matenal, are well- known to those of skill in the art Such assay methods include radioimmunoassays, competitive- binding assays, Western Blot analysis, antibody sandwich assays, antibody detection and ELISA assays Differential Expression The polynucleotides and polynucleotides of the invention may be used as reagents for differential screening methods There are many differential screening and differential display methods known m the art in which the polynucleotides and polypeptides of the invention may be used For example, the differential display technique is described by Chuang et al , J Bacterwl 175 2026-2036 (1993) This method identifies those genes which are expressed m an organism by identifying mRNA present using randomly-primed RT-PCR By companng pre-infection and post infection profiles, genes up and down regulated during infection can be identified and the RT-PCR product sequenced and matched to ORF "unknowns " In Vivo Expression Technology (IVET) is described by Camilli et al , Proc Nat'l Acad Sci USA 91 2634-2638 (1994) IVET identifies genes up-regulated dunng infection when compared to laboratory cultivation, implying an important role m infection ORFs identified by this technique are implied to have a significant role in infection establishment and/or maintenance In this technique random chromosomal fragments of target organism are cloned upstream of a promoter-less recombmase gene in a plasmid vector This construct is introduced into the target organism which cames an antibiotic resistance gene flanked by resolvase sites Growth in the presence of the antibiotic removes from the population those fragments cloned into the plasmid vector capable of supporting transcπption of the recombmase gene and therefore have caused loss of antibiotic resistance The resistant pool is introduced into a host and at various times after infection bactena may be recovered and assessed for the presence of antibiotic resistance The chromosomal fragment earned by each antibiotic sensitive bacterium should carry a promoter or portion of a gene normally upregulated during infection Sequencing upstream of the recombmase gene allows identification of the up regulated gene RT-PCR may also be used to analyze gene expression patterns. For RT PCR using the polynucleotides of the invention, messenger RNA is isolated from bacterial infected tissue, e.g, 48 hour murine lung infections, and the amount of each mRNA species assessed by reverse transcription of the RNA sample primed with random hexanucleotides followed by PCR with gene specific primer pairs The determination of the presence and amount of a particular mRNA species by quantification of the resultant PCR product provides information on the bacterial genes which are transcribed in the infected tissue. Analysis of gene transcπption can be earned out at different times of infection to ga a detailed knowledge of gene regulation m bacterial pathogenesis allowing for a clearer understanding of which gene products represent targets for screens for antibactenals. Because of the gene specific nature of the PCR primers employed it should be understood that the bacterial mRNA preparation need not be free of mammalian RNA. This allows the investigator to carry out a simple and quick RNA preparation from infected tissue to obtain bacterial mRNA species which are very short lived in the bacterium (in the order of 2 mmute halflives). Optimally the bacterial mRNA is prepared from infected murine lung tissue by mechanical disruption in the presence of TRlzole (GIBCO-BRL) for very short periods of time, subsequent processing according to the manufacturers of TRlzole reagent and DNAase treatment to remove contaminating DNA. Preferably the process is optimized by finding those conditions which give a maximum amount of Staphylococcus aureus 16S πbosomal RNA as detected by probing Northerns with a suitably labeled sequence specific oligonucleotide probe. Typically a 5' dye labeled primer is used in each PCR primer pair m a PCR reaction which is terminated optimally between 8 and 25 cycles. The PCR products are separated on 6% polyacrylamide gels with detection and quantification using GeneScanner (manufactured by ABI). Gridding and Polynucleotide Subtraction Methods have been described for obtaining information about gene expression and identity using so called "high density DNA arrays" or grids. See, e.g., M. Chee et al., Science, 274:610-614 (1996) and other references cited therein. Such gridding assays have been employed to identify certain novel gene sequences, referred to as Expressed Sequence Tags (EST) (Adams et a , Science, 252:1651-1656 (1991)). A vanety of techniques have also been described for identifying particular gene sequences on the basis of their gene products. For example, see International Patent Application No. W091/07087, published May 30, 1991. In addition, methods have been described for the amplification of desired sequences. For example, see International Patent Application No. W091/17271, published November 14, 1991 The polynucleotides of the invention may be used as components of polynucleotide arrays, preferably high density arrays or grids. These high density arrays are particularly useful for diagnostic and prognostic purposes. For example, a set of spots each comprising a different gene, and further comprising a polynucleotide or polynucleotides of the invention, may be used for probing, such as using hybridization or nucleic acid amplification, using a probes obtained or deπved from a bodily sample, to determine the presence of a particular polynucleotide sequence or related sequence m an individual. Such a presence may indicate the presence of a pathogen, particularly Staphylococcus aureus, and may be useful m diagnosmg and/or prognosmg disease or a course of disease. A gπd comprising a number of variants of the polynucleotide sequence of SEQ ID NO: 1 or 3 are prefeπed. Also preferred is a comprising a number of variants of a polynucleotide sequence encodmg the polypeptide sequence of SEQ ID NO:2 or 4. Antibodies The polypeptides and polynucleotides of the invention or vanants thereof, or cells expressing the same can be used as immunogens to produce antibodies lmmunospecific for such polypeptides or polynucleotides respectively. In certain preferred embodiments of the mvention there are provided antibodies against murD polypeptides or polynucleotides. Antibodies generated against the polypeptides or polynucleotides of the invention can be obtained by admmisteπng the polypeptides and/or polynucleotides of the invention, or epitope- beaπng fragments of either or both, analogues of either or both, or cells expressing either or both, to an animal, preferably a nonhuman, using routine protocols. For preparation of monoclonal antibodies, any technique known in the art that provides antibodies produced by continuous cell line cultures can be used Examples include vanous techniques, such as those in Kohler, G. and Milstem, C, Nature 256 495-497 (1975); Kozbor et al , Immunology Today 4: 72 (1983); Cole et al, pg. 77-96 in MONOCLONAL ANTIBODIES AND CANCER THERAPY, Alan R. Liss, Inc. (1985). Techniques for the production of single chain antibodies (U.S. Patent No. 4,946,778) can be adapted to produce single chain antibodies to polypeptides or polynucleotides of this invention. Also, transgenic mice, or other organisms such as other mammals, may be used to express humanized antibodies lmmunospecific to the polypeptides or polynucleotides of the invention Alternatively, phage display technology may be utilized to select antibody genes with binding activities towards a polypeptide of the invention either from repertoires of PCR amplified v-genes of lymphocytes from humans screened for possessing anti-murD or from naive libraries (McCafferty, et al , (1990), Nature 348, 552-554, Marks, et al , (1992) Biotechnology 10, 779-783) The affinity of these antibodies can also be improved by, for example, chain shuffling (Clackson et al , (1991) Nature 352 628) The above-descπbed antibodies may be employed to isolate or to identify clones expressing the polypeptides or polynucleotides of the invention to punfy the polypeptides or polynucleotides by, for example, affinity chromatography Thus, among others, antibodies against murD-polypeptide or murD-polynucleotide may be employed to treat infections, particularly bacterial infections Polypeptide variants include antigemcally, epitopically or immunologically equivalent variants form a particular aspect of this invention A polypeptide or polynucleotide of the invention, such as an antigemcally or immunologically equivalent derivative or a fusion protein of the polypeptide is used as an antigen to immunize a mouse or other animal such as a rat or chicken The fusion protein may provide stability to the polypeptide The antigen may be associated, foi example by conjugation, with an immunogenic carrier protein for example bovme serum albumin, keyhole limpet haemocyamn or tetanus toxoid Alternatively, a multiple antigenic polypeptide comprising multiple copies of the polypeptide, or an antigemcally or immunologically equivalent polypeptide thereof may be sufficiently antigenic to improve lmmunogemcity so as to obviate the use of a carrier Preferably, the antibody or vanant thereof is modified to make it less immunogenic in the individual For example, if the individual is human the antibody may most preferably be "humanized," where the complimentaπty determining region or regions of the hybπdoma- deπved antibody has been transplanted into a human monoclonal antibody, for example as described in Jones et al (1986), Nature 321, 522-525 or Tempest et al , (1991) Biotechnology 9, 266-273 In accordance with an aspect of the invention, there is provided the use of a polynucleotide of the invention for therapeutic or prophylactic purposes, in particular genetic immunization Among the particularly preferred embodiments of the invention are naturally occurring allelic vaπants of murD polynucleotides and polypeptides encoded thereby. The use of a polynucleotide of the invention m genetic immunization will preferably employ a suitable delivery method such as direct injection of plasmid DNA into muscles (Wolff et al , Hum Mol Genet (1992) 1 - 363, Manthorpe et al, Hum Gene Then (1983) 4- 419), delivery of DNA complexed with specific protein earners (Wu et al, J Biol Chem (1989) 264: 16985), coprecipitation of DNA with calcium phosphate (Benvenisty & Reshef, PNAS USA, (1986) 83: 9551), encapsulation of DNA m various forms of liposomes (Kaneda et al , Science (1989) 243- 375), particle bombardment (Tang et al , Nature (1992) 356:152, Eisenbraun et al , DNA Cell Biol (1993) 12. 791) and in vivo infection using cloned retroviral vectors (Seeger et al , PNAS USA (1984) 81 : 5849). Antagonists and Agonists - Assays and Molecules Polypeptides and polynucleotides of the invention may also be used to assess the binding of small molecule substrates and ligands in, for example, cells, cell-free preparations, chemical libraries, and natural product mixtures. These substrates and ligands may be natural substrates and ligands or may be structural or functional mimetics. See, e g , Cohgan et al , Current Protocols in Immunology 1 (2) Chapter 5 (1991). Polypeptides and polynucleotides of the present invention are responsible for many biological functions, including many disease states, in particular the Diseases hereinbefore mentioned It is therefore desirable to devise screening methods to identify compounds which stimulate or which inhibit the function of the polypeptide or polynucleotide. Accordingly, m a further aspect, the present mvention provides for a method of screening compounds to identify those which stimulate or which inhibit the function of a polypeptide or polynucleotide of the invention, as well as related polypeptides and polynucleotides. In general, agonists or antagonists may be employed for therapeutic and prophylactic purposes for such Diseases as hereinbefore mentioned. Compounds may be identified from a vanety of sources, for example, cells, cell-free preparations, chemical hbraπes, and natural product mixtures. Such agonists, antagonists or inhibitors so-identified may be natural or modified substrates, ligands, receptors, enzymes, etc, as the case may be, of murD polypeptides and polynucleotides; or may be structural or functional mimetics thereof (see Cohgan et al , Current Protocols in Immunology l(2):Chapter 5 (1991)). The screening methods may simply measure the binding of a candidate compound to the polypeptide or polynucleotide, or to cells or membranes beanng the polypeptide or polynucleotide, or a fusion protein of the polypeptide by means of a label directly or indirectly associated with the candidate compound Alternatively, the screening method may mvolve competition with a labeled competitor. Further, these screening methods may test whether the candidate compound results in a signal generated by activation or inhibition of the polypeptide or polynucleotide, using detection systems appropriate to the cells comprising the polypeptide or polynucleotide. Inhibitors of activation are generally assayed in the presence of a known agonist and the effect on activation by the agonist by the presence of the candidate compound is observed Constitutively active polypeptide and/or constitutively expressed polypeptides and polynucleotides may be employed in screening methods for inverse agonists or inhibitors, in the absence of an agonist or inhibitor, by testing whether the candidate compound results in inhibition of activation of the polypeptide or polynucleotide, as the case may be. Further, the screening methods may simply comprise the steps of mixing a candidate compound with a solution containing a polypeptide or polynucleotide of the present invention, to form a mixture, measuring murD polypeptide and/or polynucleotide activity in the mixture, and comparing the murD polypeptide and/or polynucleotide activity of the mixture to a standard. Fusion proteins, such as those made from Fc portion and murD polypeptide, as hereinbefore described, can also be used for high-throughput screening assays to identify antagonists of the polypeptide of the present invention, as well as of phylogenetically and and/or functionally related polypeptides (see D. Bennett et al., J Mol Recognition, 8:52-58 (1995); and K. Johanson et al., J Biol Chem, 270(16):9459-9471 (1995)). The polynucleotides, polypeptides and antibodies that bind to and/or interact with a polypeptide of the present invention may also be used to configure screening methods for detecting the effect of added compounds on the production of mRNA and or polypeptide in cells For example, an ELISA assay may be constructed for measuring secreted or cell associated levels of polypeptide using monoclonal and polyclonal antibodies by standard methods known m the art. This can be used to discover agents which may inhibit or enhance the production of polypeptide (also called antagonist or agonist, respectively) from suitably manipulated cells or tissues. The mvention also provides a method of screening compounds to identify those which enhance (agonist) or block (antagonist) the action of murD polypeptides or polynucleotides, particularly those compounds that are bacteπstatic and/or bacteπcidal. The method of screening may involve high-throughput techniques. For example, to screen for agonists or antagonists, a synthetic reaction mix, a cellular compartment, such as a membrane, cell envelope or cell wall, or a preparation of any thereof, compnsmg murD polypeptide and a labeled substrate or ligand of such polypeptide is incubated in the absence or the presence of a candidate molecule that may be a murD agonist or antagonist. The ability of the candidate molecule to agonize or antagonize the murD polypeptide is reflected in decreased binding of the labeled ligand or decreased production of product from such substrate. Molecules that bind gratuitously, i.e., without inducing the effects of murD polypeptide are most likely to be good antagonists. Molecules that bind well and, as the case may be, increase the rate of product production from substrate, increase signal transduction, or increase chemical channel activity are agonists. Detection of the rate or level of, as the case may be, production of product from substrate, signal transduction, or chemical channel activity may be enhanced by using a reporter system. Reporter systems that may be useful in this regard include but are not limited to coloπmetnc, labeled substrate converted into product, a reporter gene that is responsive to changes in murD polynucleotide or polypeptide activity, and binding assays known m the art. Polypeptides of the invention may be used to identify membrane bound or soluble receptors, if any, for such polypeptide, through standard receptor binding techniques known in the art. These techniques include, but are not limited to, ligand binding and crosslmking assays m which the polypeptide is labeled with a radioactive isotope (for instance, ^^ϊ), chemically modified (for instance, biotinylated), or fused to a peptide sequence suitable for detection or purification, and incubated with a source of the putative receptor (e.g., cells, cell membranes, cell supernatants, tissue extracts, bodily materials). Other methods include biophysical techniques such as surface plasmon resonance and spectroscopy. These screening methods may also be used to identify agonists and antagonists of the polypeptide which compete with the binding of the polypeptide to its receptor(s), if any. Standard methods for conducting such assays are well understood in the art. The fluorescence polarization value for a fluorescently-tagged molecule depends on the rotational correlation time or tumbling rate. Protein complexes, such as foπned by murD polypeptide associating with another murD polypeptide or other polypeptide, labeled to comprise a fluorescently-labeled molecule will have higher polaπzation values than a fluorescently labeled monomeπc protein. It is preferred that this method be used to characterize small molecules that disrupt polypeptide complexes. Fluorescence energy transfer may also be used characterize small molecules that interfere with the formation of murD polypeptide dimers, tπmers, tetramers or higher order structures, or structures formed by murD polypeptide bound to another polypeptide. MurD polypeptide can be labeled with both a donor and acceptor fluorophore. Upon mixing of the two labeled species and excitation of the donor fluorophore, fluorescence energy transfer can be detected by observing fluorescence of the acceptor Compounds that block dimeπzation will inhibit fluorescence energy transfer. Surface plasmon resonance can be used to monitor the effect of small molecules on murD polypeptide self-association as well as an association of murD polypeptide and another polypeptide or small molecule. murD polypeptide can be coupled to a sensor chip at low site density such that covalently bound molecules will be monomeπc Solution protein can then passed over the murD polypeptide -coated surface and specific binding can be detected m real-time by monitoring the change in resonance angle caused by a change m local refractive index. This technique can be used to charactenze the effect of small molecules on kinetic rates and equilibrium binding constants for murD polypeptide self-association as well as an association of murD polypeptide and another polypeptide or small molecule. A scintillation proximity assay may be used to charactenze the interaction between an association of murD polypeptide with another murD polypeptide or a different polypeptide . murD polypeptide can be coupled to a scintillation-filled bead. Addition of radio-labeled murD polypeptide results m binding where the radioactive source molecule is m close proximity to the scintillation fluid. Thus, signal is emitted upon murD polypeptide binding and compounds that prevent murD polypeptide self-association or an association of murD polypeptide and another polypeptide or small molecule will dimmish signal. ICS biosensors have been described by AMBRI (Australian Membrane Biotechnology Research Institute). They couple the self-association of macromolecules to the closing of gramacidm-facilitated ion channels in suspended membrane bilayers and hence to a measurable change m the admittance (similar to impedence) of the biosensor. This approach is linear over six decades of admittance change and is ideally suited for large scale, high through-put screening of small molecule combinatorial hbraπes. In other embodiments of the mvention there are provided methods for identifying compounds which bind to or otherwise interact with and inhibit or activate an activity or expression of a polypeptide and/or polynucleotide of the invention compns g: contacting a polypeptide and or polynucleotide of the invention with a compound to be screened under conditions to permit binding to or other interaction between the compound and the polypeptide and/or polynucleotide to assess the binding to or other interaction with the compound, such binding or interaction preferably being associated with a second component capable of providing a detectable signal in response to the binding or interaction of the polypeptide and/or polynucleotide with the compound; and determining whether the compound binds to or otherwise interacts with and activates or inhibits an activity or expression of the polypeptide and/or polynucleotide by detecting the presence or absence of a signal generated from the binding or interaction of the compound with the polypeptide and/or polynucleotide. Another example of an assay for murD agonists is a competitive assay that combines murD and a potential agonist with murD-bmding molecules, recombinant murD binding molecules, natural substrates or ligands, or substrate or ligand mimetics, under appropnate conditions for a competitive inhibition assay. murD can be labeled, such as by radioactivity or a coloπmetπc compound, such that the number of murD molecules bound to a binding molecule or converted to product can be determined accurately to assess the effectiveness of the potential antagonist. Potential antagonists include, among others, small organic molecules, peptides, polypeptides and antibodies that bind to a polynucleotide and/or polypeptide of the invention and thereby inhibit or extinguish its activity or expression. Potential antagonists also may be small organic molecules, a peptide, a polypeptide such as a closely related protein or antibody that binds the same sites on a binding molecule, such as a binding molecule, without inducing murD- mduced activities, thereby preventing the action or expression of murD polypeptides and/or polynucleotides by excluding murD polypeptides and/or polynucleotides from binding. Potential antagonists include a small molecule that binds to and occupies the binding site of the polypeptide thereby preventing binding to cellular binding molecules, such that normal biological activity is prevented. Examples of small molecules include but are not limited to small organic molecules, peptides or peptide-hke molecules. Other potential antagonists include antisense molecules (see Okano, J Neurochem 56 560 (1991); OLIGODEOXYNUCLEOTIDES AS ANTISENSE INHIBITORS OF GENE EXPRESSION, CRC Press, Boca Raton, FL (1988), for a descπption of these molecules). Preferred potential antagonists include compounds related to and variants of murD. Other examples of potential polypeptide antagonists include antibodies or, in some cases, oligonucleotides or proteins which are closely related to the ligands, substrates, receptors, enzymes, etc, as the case may be, of the polypeptide, e.g, a fragment of the ligands, substrates, receptors, enzymes, etc.; or small molecules which bind to the polypeptide of the present invention but do not elicit a response, so that the activity of the polypeptide is prevented. Certain of the polypeptides of the mvention are biomimetics, functional mimetics of the natural murD polypeptide These functional mimetics may be used for, among other things, antagonizing the activity of murD polypeptide or as a antigen or immunogen m a manner descnbed elsewhere herein Functional mimetics of the polypeptides of the invention include but are not limited to truncated polypeptides. For example, preferred functional mimetics include, a polypeptide compnsmg the polypeptide sequence set forth in SEQ ID NO:2 lacking 20, 30, 40, 50, 60, 70 or 80 amino- or carboxy-termmal ammo acid residues, including fusion proteins compnsmg one or more of these truncated sequences Polynucleotides encodmg each of these functional mimetics may be used as expression cassettes to express each mimetic polypeptide. It is preferred that these cassettes compnse 5' and 3' restπction sites to allow for a convenient means to hgate the cassettes together when desired. It is further preferred that these cassettes compnse gene expression signals known in the art or descπbed elsewhere herein. Thus, m another aspect, the present invention relates to a screening kit for identifying agonists, antagonists, ligands, receptors, substrates, enzymes, etc. for a polypeptide and/or polynucleotide of the present invention; or compounds which decrease or enhance the production of such polypeptides and/or polynucleotides , which comprises: (a) a polypeptide and or a polynucleotide of the present invention; (b) a recombinant cell expressing a polypeptide and or polynucleotide of the present invention; (c) a cell membrane expressing a polypeptide and/or polynucleotide of the present invention; or (d) antibody to a polypeptide and/or polynucleotide of the present mvention; which polypeptide is preferably that of SEQ ID NO:2, and which polynucleotide is preferably that of SEQ ID NO:l. It will be appreciated that m any such kit, (a), (b), (c) or (d) may compnse a substantial component It will be readily appreciated by the skilled artisan that a polypeptide and/or polynucleotide of the present invention may also be used m a method for the structure-based design of an agonist, antagonist or inhibitor of the polypeptide and/or polynucleotide, by: (a) determining in the first instance the three-dimensional structure of the polypeptide and/or polynucleotide, or complexes thereof; (b) deducing the three-dimensional structure for the likely reactive sιte(s), binding sιte(s) or motιf(s) of an agonist, antagonist or inhibitor; (c) synthesizing candidate compounds that are predicted to bind to or react with the deduced binding sιte(s), reactive sιte(s), and/or motιf(s); and (d) testing whether the candidate compounds are indeed agonists, antagonists or inhibitors It will be further appreciated that this will normally be an iterative process, and this iterative process may be performed using automated and computer-controlled steps. In a further aspect, the present invention provides methods of treating abnormal conditions such as, for instance, a Disease, related to either an excess of, an under-expression of, an elevated activity of, or a decreased activity of murD polypeptide and or polynucleotide. If the expression and or activity of the polypeptide and or polynucleotide is m excess, several approaches are available. One approach compπses admimsteπng to an individual in need thereof an inhibitor compound (antagonist) as herein described, optionally in combination with a pharmaceutically acceptable earner, m an amount effective to inhibit the function and/or expression of the polypeptide and/or polynucleotide, such as, for example, by blocking the binding of ligands, substrates, receptors, enzymes, etc, or by inhibiting a second signal, and thereby alleviating the abnormal condition. In another approach, soluble forms of the polypeptides still capable of binding the ligand, substrate, enzymes, receptors, etc. in competition with endogenous polypeptide and/or polynucleotide may be administered. Typical examples of such competitors include fragments of the murD polypeptide and/or polypeptide. In a further aspect, the present invention relates to genetically engineered soluble fusion proteins comprising a polypeptide of the present invention, or a fragment thereof, and various portions of the constant regions of heavy or light chains of lmmunoglobulms of various subclasses (IgG, IgM, IgA, IgE). Preferred as an lmmunoglobulm is the constant part of the heavy chain of human IgG, particularly IgGl, where fusion takes place at the hinge region. In a particular embodiment, the Fc part can be removed simply by incorporation of a cleavage sequence which can be cleaved with blood clotting factor Xa. Furthermore, this invention relates to processes for the preparation of these fusion proteins by genetic engineering, and to the use thereof for drug screening, diagnosis and therapy. A further aspect of the invention also relates to polynucleotides encodmg such fusion proteins. Examples of fusion protein technology can be found in International Patent Application Nos. W094/29458 and W094/22914. In still another approach, expression of the gene encoding endogenous murD polypeptide can be inhibited using expression blocking techniques This blocking may be targeted against any step m gene expression, but is preferably targeted against transcription and/or translation. An examples of a known technique of this sort mvolve the use of antisense sequences, either internally generated or separately administered (see, for example, O'Connor, J Neurochem (1991) 56:560 m Ohgodeoxynucleotides as Antisense Inhibitors of Gene Expression, CRC Press, Boca Raton, FL (1988)). Alternatively, oligonucleotides which form triple helices with the gene can be supplied (see, for example, Lee et al, Nucleic Acids Res (1979) 6:3073; Cooney et al. Science (1988) 241 :456; Dervan et al, Science (1991) 251 : 1360). These ohgomers can be administered per se or the relevant ohgomers can be expressed in vivo. Each of the polynucleotide sequences provided herein may be used in the discovery and development of antibacterial compounds. The encoded protein, upon expression, can be used as a target for the screening of antibacterial drugs Additionally, the polynucleotide sequences encoding the ammo terminal regions of the encoded protein or Shme-Delgarno or other translation facilitating sequences of the respective mRNA can be used to construct antisense sequences to control the expression of the coding sequence of interest. The invention also provides the use of the polypeptide, polynucleotide, agonist or antagonist of the invention to interfere with the initial physical interaction between a pathogen or pathogens and a eukaryotic, preferably mammalian, host responsible for sequelae of infection In particular, the molecules of the invention may be used: in the prevention of adhesion of bacteria, in particular gram positive and/or gram negative bacteria, to eukaryotic, preferably mammalian, extracellular matrix proteins on m-dwellmg devices or to extracellular matrix proteins m wounds; to block bacterial adhesion between eukaryotic, preferably mammalian, extracellular matrix proteins and bacterial murD proteins that mediate tissue damage and/or; to block the normal progression of pathogenesis in infections initiated other than by the implantation of in-dwelling devices or by other surgical techniques. In accordance with yet another aspect of the invention, there are provided murD agonists and antagonists, preferably bacteπstatic or bactencidal agonists and antagonists. The antagonists and agonists of the invention may be employed, for instance, to prevent, inhibit and/or treat diseases. Hehcobacter pylori (herein "H pylori") bacteria infect the stomachs of over one-third of the world's population causing stomach cancer, ulcers, and gastritis (International Agency for Research on Cancer (1994) Schistosomes, Liver Flukes and Hehcobacter Pylon (International Agency for Research on Cancer, Lyon, France, http://www.uicc.ch/ecp/ecp2904.htm). Moreover, the International Agency for Research on Cancer recently recognized a cause-and-effect relationship between H pylori and gastric adenocarcmoma, classifying the bacterium as a Group I (definite) carcinogen. Preferred antimicrobial compounds of the mvention (agonists and antagonists of murD polypeptides and/or polynucleotides) found using screens provided by the invention, or known in the art, particularly naπow-spectrum antibiotics, should be useful m the treatment of H pylori infection. Such treatment should decrease the advent of H /ry/oπ-mduced cancers, such as gastrointestinal carcinoma Such treatment should also prevent, inhibit and/or cure gastric ulcers and gastritis. Vaccines There are provided by the invention, products, compositions and methods for assessmg murD expression, treating disease, assaying genetic vanation, and admimsteπng a murD polypeptide and/or polynucleotide to an organism to raise an immunological response against a bacteπa, especially a Staphylococcus aureus bacteπa. Another aspect of the mvention relates to a method for inducing an immunological response m an individual, particularly a mammal which comprises inoculating the individual with murD polynucleotide and/or polypeptide, or a fragment or variant thereof, adequate to produce antibody and/ or T cell immune response to protect said individual from infection, particularly bacterial infection and most particularly Staphylococcus aureus infection. Also provided are methods whereby such immunological response slows bacterial replication. Yet another aspect of the mvention relates to a method of inducing immunological response in an individual which comprises delivering to such individual a nucleic acid vector, sequence or ribozyme to direct expression of murD polynucleotide and/or polypeptide, or a fragment or a variant thereof, for expressing murD polynucleotide and/or polypeptide, or a fragment or a variant thereof in vivo in order to induce an immunological response, such as, to produce antibody and/ or T cell immune response, including, for example, cytokme-producmg T cells or cytotoxic T cells, to protect said individual, preferably a human, from disease, whether that disease is already established withm the individual or not. One example of administering the gene is by accelerating it into the desired cells as a coating on particles or otherwise Such nucleic acid vector may compnse DNA, RNA, a ribozyme, a modified nucleic acid, a DNA/RNA hybrid, a DNA-protem complex or an RNA-protem complex. A further aspect of the invention relates to an immunological composition that when introduced into an individual, preferably a human, capable of having induced withm it an immunological response, induces an immunological response m such individual to a murD polynucleotide and/or polypeptide encoded therefrom, wherein the composition comprises a recombinant murD polynucleotide and/or polypeptide encoded therefrom and/or compnses DNA and or RNA which encodes and expresses an antigen of said murD polynucleotide, polypeptide encoded therefrom, or other polypeptide of the invention The immunological response may be used therapeutically or prophylactically and may take the form of antibody immunity and or cellular immunity, such as cellular immunity arising from CTL or CD4+ T cells A murD polypeptide or a fragment thereof may be fused with co-protem or chemical moiety which may or may not by itself produce antibodies, but which is capable of stabilizing the first protein and producing a fused or modified protein which will have antigenic and/or immunogenic properties, and preferably protective properties Thus fused recombinant protein, preferably further comprises an antigenic co-protem, such as hpoprotem D from Hemophilus influenzae, Glutathione-S-transferase (GST) or beta-galactosidase, or any other relatively large co-protem which solubihzes the protein and facilitates production and purification thereof Moreover, the co-protem may act as an adjuvant m the sense of providing a generalized stimulation of the immune system of the organism receiving the protein. The co- protem may be attached to either the ammo- or carboxy-termmus of the first protein. Provided by this invention are compositions, particularly vaccine compositions, and methods comprising the polypeptides and/or polynucleotides of the invention and immunostimulatory DNA sequences, such as those descnbed in Sato, Y. et al. Science 273. 352 (1996) Also, provided by this mvention are methods using the described polynucleotide or particular fragments thereof, which have been shown to encode non-vaπable regions of bacterial cell surface proteins, m polynucleotide constructs used in such genetic immunization experiments in animal models of infection with Staphylococcus aureus. Such expenments will be particularly useful for identifying protein epitopes able to provoke a prophylactic or therapeutic immune response. It is believed that this approach will allow for the subsequent preparation of monoclonal antibodies of particular value, derived from the requisite organ of the animal successfully resisting or clearing infection, for the development of prophylactic agents or therapeutic treatments of bacterial infection, particularly Staphylococcus aureus infection, in mammals, particularly humans. A polypeptide of the invention may be used as an antigen for vaccination of a host to produce specific antibodies which protect against invasion of bacteria, for example by blocking adherence of bacteria to damaged tissue. Examples of tissue damage include wounds in skm or connective tissue caused, for example, by mechanical, chemical, thermal or radiation damage or by implantation of indwelling devices, or wounds the mucous membranes, such as the mouth, throat, mammary glands, urethra or vagma. The invention also includes a vaccine formulation which comprises an immunogenic recombinant polypeptide and or polynucleotide of the invention together with a suitable carrier, such as a pharmaceutically acceptable carrier. Since the polypeptides and polynucleotides may be broken down m the stomach, each is preferably administered parenterally, including, for example, administration that is subcutaneous, intramuscular, intravenous, or mtradermal. Formulations suitable for parenteral administration include aqueous and non-aqueous stenle injection solutions which may contain anti-oxidants, buffers, bactenstatic compounds and solutes which render the formulation lsotomc with the bodily fluid, preferably the blood, of the individual; and aqueous and non-aqueous sterile suspensions which may include suspending agents or thickening agents. The formulations may be presented in umt-dose or multi-dose containers, for example, sealed ampoules and vials and may be stored in a freeze-dned condition requiring only the addition of the sterile liquid earner immediately pπor to use. The vaccine formulation may also include adjuvant systems for enhancing the lmmunogemcity of the formulation, such as oil-m water systems and other systems known in the art. The dosage will depend on the specific activity of the vaccine and can be readily determined by routine experimentation. While the invention has been described with reference to certain murD polypeptides and polynucleotides, it is to be understood that this covers fragments of the naturally occurπng polypeptides and polynucleotides, and similar polypeptides and polynucleotides with additions, deletions or substitutions which do not substantially affect the immunogenic properties of the recombinant polypeptides or polynucleotides. Compositions, kits and administration In a further aspect of the invention there are provided compositions compnsmg a murD polynucleotide and/or a murD polypeptide for administration to a cell or to a multicellular organism. The invention also relates to compositions compπsing a polynucleotide and/or a polypeptides discussed herein or their agonists or antagonists The polypeptides and polynucleotides of the invention may be employed in combination with a non-steπle or stenle carrier or carriers for use with cells, tissues or organisms, such as a pharmaceutical earner suitable for administration to an individual. Such compositions compnse, for instance, a media additive or a therapeutically effective amount of a polypeptide and/or polynucleotide of the invention and a pharmaceutically acceptable earner or excipient. Such earners may include, but are not limited to, saline, buffered saline, dextrose, water, glycerol, ethanol and combinations thereof. The formulation should suit the mode of administration. The invention further relates to diagnostic and pharmaceutical packs and kits compnsmg one or more containers filled with one or more of the ingredients of the aforementioned compositions of the invention. Polypeptides, polynucleotides and other compounds of the invention may be employed alone or in conjunction with other compounds, such as therapeutic compounds. The pharmaceutical compositions may be administered m any effective, convenient manner including, for instance, administration by topical, oral, anal, vaginal, intravenous, intrapentoneal, intramuscular, subcutaneous, mtranasal or mtradermal routes among others. In therapy or as a prophylactic, the active agent may be administered to an individual as an mjectable composition, for example as a sterile aqueous dispersion, preferably lsotomc. Alternatively the composition may be formulated for topical application for example the form of ointments, creams, lotions, eye ointments, eye drops, ear drops, mouthwash, impregnated dressings and sutures and aerosols, and may contain appropnate conventional additives, including, for example, preservatives, solvents to assist drug penetration, and emollients in ointments and creams. Such topical formulations may also contain compatible conventional earners, for example cream or ointment bases, and ethanol or oleyl alcohol for lotions. Such carriers may constitute from about 1% to about 98% by weight of the formulation; more usually they will constitute up to about 80% by weight of the formulation. In a further aspect, the present invention provides for pharmaceutical compositions compnsmg a therapeutically effective amount of a polypeptide and/or polynucleotide, such as the soluble form of a polypeptide and/or polynucleotide of the present invention, agonist or antagonist peptide or small molecule compound, combination with a pharmaceutically acceptable earner or excipient. Such earners include, but are not limited to. salme, buffered saline, dextrose, water, glycerol, ethanol, and combinations thereof. The invention further relates to pharmaceutical packs and kits compnsmg one or more containers filled with one or more of the ingredients of the aforementioned compositions of the invention. Polypeptides, polynucleotides and other compounds of the present invention may be employed alone or in conjunction with other compounds, such as therapeutic compounds. The composition will be adapted to the route of administration, for instance by a systemic or an oral route Preferred forms of systemic administration include injection, typically by intravenous injection Other injection routes, such as subcutaneous, intramuscular, or intrapentoneal, can be used. Alternative means for systemic administration include transmucosal and transdermal administration using penetrants such as bile salts or fusidic acids or other detergents. In addition, if a polypeptide or other compounds of the present invention can be formulated in an entenc or an encapsulated formulation, oral administration may also be possible. Administration of these compounds may also be topical and/or localized, in the form of salves, pastes, gels, and the like. For administration to mammals, and particularly humans, it is expected that the daily dosage level of the active agent will be from 0.01 mg/kg to 10 mg/kg, typically around 1 mg/kg The physician any event will determine the actual dosage which will be most suitable for an individual and will vary with the age, weight and response of the particular individual. The above dosages are exemplary of the average case There can, of course, be individual instances where higher or lower dosage ranges are mented, and such are withm the scope of this invention. In-dwelling devices include surgical implants, prosthetic devices and catheters, i.e., devices that are introduced to the body of an individual and remain in position for an extended time Such devices include, for example, artificial joints, heart valves, pacemakers, vascular grafts, vascular catheters, cerebrospinal fluid shunts, unnary catheters, continuous ambulatory peritoneal dialysis (CAPD) catheters. The composition of the invention may be administered by injection to achieve a systemic effect against relevant bacteria shortly before insertion of an in-dwelling device. Treatment may be continued after surgery during the m-body time of the device In addition, the composition could also be used to broaden penoperative cover for any surgical technique to prevent bacterial wound infections, especially Staphylococcus aureus wound infections. Many orthopedic surgeons consider that humans with prosthetic joints should be considered for antibiotic prophylaxis before dental treatment that could produce a bacteremia Late deep infection is a serious complication sometimes leading to loss of the prosthetic joint and is accompanied by significant morbidity and mortality. It may therefore be possible to extend the use of the active agent as a replacement for prophylactic antibiotics in this situation. In addition to the therapy described above, the compositions of this invention may be used generally as a wound treatment agent to prevent adhesion of bacteria to matrix proteins exposed m wound tissue and for prophylactic use in dental treatment as an alternative to, or in conjunction with, antibiotic prophylaxis. Alternatively, the composition of the invention may be used to bathe an indwelling device immediately before insertion The active agent will preferably be present at a concentration of 1 μg/ml to lOmg/ml for bathing of wounds or indwelling devices. A vaccine composition is conveniently m mjectable form. Conventional adjuvants may be employed to enhance the immune response. A suitable unit dose for vaccination is 0.5-5 microgram/kg of antigen, and such dose is preferably administered 1-3 times and with an interval of 1-3 weeks With the indicated dose range, no adverse toxicological effects will be observed with the compounds of the invention which would preclude their administration to suitable individuals. Sequence Databases, Sequences in a Tangible Medium, and Algorithms Polynucleotide and polypeptide sequences form a valuable information resource with which to determine their 2- and 3-dιmensιonal structures as well as to identify further sequences of similar homology. These approaches are most easily facilitated by stoπng the sequence m a computer readable medium and then using the stored data in a known macromolecular structure program or to search a sequence database using well known searching tools, such as GCC. The polynucleotide and polypeptide sequences of the invention are particularly useful as components in databases useful for search analyses as well as in sequence analysis algorithms As used in this section entitled "Sequence Databases, Sequences in a Tangible Medium, and Algorithms," and m claims related to this section, the terms "polynucleotide of the invention" and "polynucleotide sequence of the mvention" mean any detectable chemical or physical characteristic of a polynucleotide of the mvention that is or may be reduced to or stored in a tangible medium, preferably a computer readable form For example, chromatographic scan data or peak data, photographic data or scan data therefrom, called bases, and mass spectrographic data. As used m this section entitled Databases and Algonthms and in claims related thereto, the terms "polypeptide of the invention" and "polypeptide sequence of the invention" mean any detectable chemical or physical characteristic of a polypeptide of the invention that is or may be reduced to or stored in a tangible medium, preferably a computer readable form. For example, chromatographic scan data or peak data, photographic data or scan data therefrom, and mass spectrographic data. The invention provides a computer readable medium having stored thereon polypeptide sequences of the mvention and/or polynucleotide sequences of the invention For example, a computer readable medium is provided comprising and having stored thereon a member selected from the group consisting of: a polynucleotide comprising the sequence of a polynucleotide of the invention; a polypeptide comprising the sequence of a polypeptide sequence of the invention; a set of polynucleotide sequences wherein at least one of the sequences comprises the sequence of a polynucleotide sequence of the mvention; a set of polypeptide sequences wherein at least one of the sequences compnses the sequence of a polypeptide sequence of the invention; a data set representing a polynucleotide sequence comprising the sequence of polynucleotide sequence of the invention; a data set representing a polynucleotide sequence encodmg a polypeptide sequence comprising the sequence of a polypeptide sequence of the mvention; a polynucleotide comprising the sequence of a polynucleotide sequence of the invention; a polypeptide compnsmg the sequence of a polypeptide sequence of the invention; a set of polynucleotide sequences wherein at least one of the sequences comprises the sequence of a polynucleotide sequence of the invention; a set of polypeptide sequences wherein at least one of said sequences comprises the sequence of a polypeptide sequence of the invention; a data set representing a polynucleotide sequence comprising the sequence of a polynucleotide sequence of the invention; a data set representing a polynucleotide sequence encodmg a polypeptide sequence comprising the sequence of a polypeptide sequence of the mvention. The computer readable medium can be any composition of matter used to store information or data, including, for example, commercially available floppy disks, tapes, chips, hard drives, compact disks, and video disks. Also provided by the invention are methods for the analysis of character sequences or strings, particularly genetic sequences or encoded genetic sequences. Prefeπed methods of sequence analysis include, for example, methods of sequence homology analysis, such as identity and similarity analysis, RNA structure analysis, sequence assembly, cladistic analysis, sequence motif analysis, open reading frame determination, nucleic acid base calling, nucleic acid base trimming, and sequencing chromatogram peak analysis. A computer based method is provided for performing homology identification This method compnses the steps of providing a first polynucleotide sequence comprising the sequence a polynucleotide of the invention in a computer readable medium; and comparing said first polynucleotide sequence to at least one second polynucleotide or polypeptide sequence to identify homology A computer based method is also provided for performing homology identification, said method comprising the steps of: providing a first polypeptide sequence comprising the sequence of a polypeptide of the invention in a computer readable medium; and companng said first polypeptide sequence to at least one second polynucleotide or polypeptide sequence to identify homology A computer based method is still further provided for polynucleotide assembly, said method compnsmg the steps of: providing a first polynucleotide sequence comprising the sequence of a polynucleotide of the invention m a computer readable medium; and screening for at least one overlapping region between said first polynucleotide sequence and at least one second polynucleotide or polypeptide sequence. A computer based method is still further provided for polynucleotide assembly, said method compnsmg the steps of: providing a first polypeptide sequence comprising a polypeptide of the invention in a computer readable medium; and screening for at least one overlapping region between said first polypeptide sequence and at least one second polynucleotide or polypeptide sequence. In another preferred embodiment of the invention there is provided a computer readable medium having stored thereon a member selected from the group consisting of. a polynucleotide comprising the sequence of SEQ ID NO: l or 3; a polypeptide comprising the sequence of SEQ ID NO.2 or 4; a set of polynucleotide sequences wherein at least one of said sequences comprises the sequence of SEQ ID NO. l or 3; a set of polypeptide sequences wherein at least one of said sequences comprises the sequence of SEQ ID NO.2 or 4; a data set representing a polynucleotide sequence comprising the sequence of SEQ ID NO 1 or 3; a data set representing a polynucleotide sequence encoding a polypeptide sequence comprising the sequence of SEQ ID NO:2 or 4; a polynucleotide comprising the sequence of SEQ ID NO:l or 3; a polypeptide comprising the sequence of SEQ ID NO:2 or 4; a set of polynucleotide sequences wherein at least one of said sequences comprises the sequence of SEQ ID NO: l or 3; a set of polypeptide sequences wherein at least one of said sequences comprises the sequence of SEQ ID NO:2 or 4; a data set representing a polynucleotide sequence comprising the sequence of SEQ ID NO: l or 3; a data set representing a polynucleotide sequence encoding a polypeptide sequence comprising the sequence of SEQ ID NO:2 or 4. A further preferred embodiment of the invention provides a computer based method for performing homology identification, said method comprising the steps of providing a polynucleotide sequence comprising the sequence of SEQ ID NO: 1 or 3 in a computer readable medium, and comparing said polynucleotide sequence to at least one polynucleotide or polypeptide sequence to identify homology. A still further preferred embodiment of the invention provides a computer based method for performing homology identification, said method comprising the steps of: providing a polypeptide sequence comprising the sequence of SEQ ID NO:2 or 4 in a computer readable medium; and comparing said polypeptide sequence to at least one polynucleotide or polypeptide sequence to identify homology. A further embodiment of the invention provides a computer based method for polynucleotide assembly, said method comprising the steps of: providing a first polynucleotide sequence comprising the sequence of SEQ ID NO: 1 or 3 in a computer readable medium; and screening for at least one overlapping region between said first polynucleotide sequence and a second polynucleotide sequence. A further embodiment of the invention provides a computer based method for performing homology identification, said method comprising the steps of: providing a polynucleotide sequence comprising the sequence of SEQ ID NO: 1 or 3 in a computer readable medium; and comparing said polynucleotide sequence to at least one polynucleotide or polypeptide sequence to identify homology. All publications and references, including but not limited to patents and patent applications, cited m this specification are herein incoφorated by reference m their entirety as if each individual publication or reference were specifically and individually indicated to be incoφorated by reference herein as being fully set forth Any patent application to which this application claims priority is also incoφorated by reference herein in its entirety m the manner described above for publications and references. GLOSSARY The following definitions are provided to facilitate understanding of certain terms used frequently herein. " Antιbody(ιes)" as used herein includes polyclonal and monoclonal antibodies, chimeric, single chain, and humanized antibodies, as well as Fab fragments, including the products of an Fab or other lmmunoglobulm expression library. "Antigemcally equivalent deπvatιve(s)" as used herein encompasses a polypeptide, polynucleotide, or the equivalent of either which will be specifically recognized by certain antibodies which, when raised to the protein, polypeptide or polynucleotide according to the invention, interferes with the immediate physical interaction between pathogen and mammalian host. "Bispecific antιbody(ιes)" means an antibody comprising at least two antigen binding domains, each domain directed against a different epitope. "Bodily mateπal(s) means any matenal denved from an individual or from an organism infecting, infesting or inhabiting an individual, including but not limited to, cells, tissues and waste, such as, bone, blood, serum, cerebrospinal fluid, semen, saliva, muscle, cartilage, organ tissue, skm, unne, stool or autopsy matenals.. "Dιsease(s)" means any disease caused by or related to infection by a bacteπa, including , for example, disease, such as, infections of the upper respiratory tract (e.g, otitis media, bactenal tracheitis, acute epiglottitis, thyroiditis), lower respiratory (e.g, empyema, lung abscess), cardiac (e.g, infective endocarditis), gastrointestinal (e.g, secretory diarrhoea, splenic absces, retropeπtoneal abscess), CNS (e.g, cerebral abscess), eye (e.g, blephaπtis, conjunctivitis, keratitis, endophthalmitis, preseptal and orbital cellulitis, darcryocystitis), kidney and unnary tract (e.g, epididymitis, mtrarenal and pennephnc absces, toxic shock syndrome), skin (e.g, impetigo, folliculitis, cutaneous abscesses, cellulitis, wound infection, bacteπal myositis) bone and joint (e.g, septic arthritis, osteomyelitis). "Fusion protem(s)" refers to a protein encoded by two, often unrelated, fused genes or fragments thereof. In one example, EP-A-0464 discloses fusion proteins comprising various portions of constant region of immunoglobulin molecules together with another human protein or part thereof. In many cases, employing an immunoglobulin Fc region as a part of a fusion protein is advantageous for use m therapy and diagnosis resulting in, for example, improved pharmacokinetic properties [see, e g., EP-A 0232262], On the other hand, for some uses it would be desirable to be able to delete the Fc part after the fusion protein has been expressed, detected and purified. "Host cell(s)" is a cell which has been transformed or transfected, or is capable of transformation or transfection by an exogenous polynucleotide sequence. "Identity," as known in the art, is a relationship between two or more polypeptide sequences or two or more polynucleotide sequences, as the case may be, as determined by comparing the sequences. In the art, "identity" also means the degree of sequence relatedness between polypeptide or polynucleotide sequences, as the case may be, as determined by the match between stnngs of such sequences. "Identity" can be readily calculated by known methods, including but not limited to those descnbed in (Computational Molecular Biology, Lesk, A.M., ed, Oxford University Press, New York, 1988; Biocomputing: Informatics and Genome Projects, Smith, D.W, ed. Academic Press, New York, 1993; Computer Analysis of Sequence Data, Part I, Griffin, A.M., and Griffin, H.G, eds, Humana Press, New Jersey, 1994; Sequence Analysis in Molecular Biology, von Hemje, G, Academic Press, 1987; and Sequence Analysis Primer, Gπbskov, M. and Devereux, J, eds, M Stockton Press, New York, 1991; and Caπllo, H, and Lipman, D, SIAM J. Applied Math., 48: 1073 (1988). Methods to determine identity are designed to give the largest match between the sequences tested. Moreover, methods to determine identity are codified in publicly available computer programs. Computer program methods to determine identity between two sequences include, but are not limited to, the GCG program package (Devereux, J, et al. Nucleic Acids Research 12(1): 387 (1984)), BLASTP, BLASTN, and FASTA (Altschul, S.F. et al, J Molec. Bwl. 215: 403-410 (1990). The BLAST X program is publicly available from NCBI and other sources (BLAST Manual, Altschul, S, et al , NCBI NLM NIH Bethesda, MD 20894; Altschul, S, et al, J. Mol. Biol 215: 403-410 (1990). The well known Smith Waterman algorithm may also be used to determine identity. Parameters for polypeptide sequence comparison include the following: Algorithm: Needleman and Wunsch, J. Mol Biol. 48: 443-453 (1970) Comparison matrix: BLOSSUM62 from Hentikoff and Hentikoff, Proc. Natl. Acad. Sci. USA. 89: 10915-10919 (1992) Gap Penalty: 12 Gap Length Penalty: 4 A program useful with these parameters is publicly available as the "gap" program from Genetics Computer Group, Madison WI. The aforementioned parameters are the default parameters for peptide comparisons (along with no penalty for end gaps). Parameters for polynucleotide comparison include the following: Algorithm: Needleman and Wunsch, J. Mol Biol. 48: 443-453 (1970) Comparison matrix: matches = +10, mismatch = 0 Gap Penalty: 50 Gap Length Penalty: 3 Available as: The "gap" program from Genetics Computer Group, Madison WI. These are the default parameters for nucleic acid comparisons. A preferred meaning for "identity" for polynucleotides and polypeptides, as the case may be, are provided in (1 ) and (2) below. (1 ) Polynucleotide embodiments further include an isolated polynucleotide comprising a polynucleotide sequence having at least a 50, 60, 70, 80, 85, 90, 95, 97 or 100% identity to the reference sequence of SEQ ID NO: l, wherein said polynucleotide sequence may be identical to the reference sequence of SEQ ID NO:l or may include up to a certain integer number of nucleotide alterations as compared to the reference sequence, wherein said alterations are selected from the group consisting of at least one nucleotide deletion, substitution, including transition and transversion, or insertion, and wherein said alterations may occur at the 5' or 3' terminal positions of the reference nucleotide sequence or anywhere between those terminal positions, interspersed either individually among the nucleotides m the reference sequence or m one or more contiguous groups withm the reference sequence, and wherein said number of nucleotide alterations is determined by multiplying the total number of nucleotides m SEQ ID NO'l by the integer defining the percent identity divided by 100 and then subtracting that product from said total number of nucleotides in SEQ ID NO- 1 , or. n n < x n - (x n • y), wherein n n is the number of nucleotide alterations, x n is the total number of nucleotides in SEQ ID NO:l, y is 0.50 for 50%, 0.60 for 60%, 0.70 for 70%, 0.80 for 80%, 0.85 for 85%, 0.90 for 90%, 0.95 for 95%, 0.97 for 97% or 1.00 for 100%, and • is the symbol for the multiplication operator, and wherein any non-integer product of x n and y is rounded down to the nearest integer prior to subtracting it from x n Alterations of a polynucleotide sequence encoding the polypeptide of SEQ ID NO.2 may create nonsense, missense or frameshift mutations in this coding sequence and thereby alter the polypeptide encoded by the polynucleotide following such alterations. By way of example, a polynucleotide sequence of the present mvention may be identical to the reference sequence of SEQ ID NO: 1 , that is it may be 100% identical, or it may include up to a certain integer number of nucleic acid alterations as compared to the reference sequence such that the percent identity is less than 100% identity. Such alterations are selected from the group consisting of at least one nucleic acid deletion, substitution, including transition and transversion, or insertion, and wherein said alterations may occur at the 5' or 3' terminal positions of the reference polynucleotide sequence or anywhere between those terminal positions, interspersed either individually among the nucleic acids in the reference sequence or in one or more contiguous groups withm the reference sequence. The number of nucleic acid alterations for a given percent identity is determined by multiplying the total number of nucleic acids m SEQ ID NO: 1 by the integer defining the percent identity divided by 100 and then subtracting that product from said total number of nucleic acids in SEQ ID NO:l, or: n n < x n - (x n • y), wherein n n is the number of nucleic acid alterations, x n is the total number of nucleic acids m SEQ ID NO: 1 , y is, for instance 0.70 for 70%, 0.80 for 80%, 0.85 for 85% etc , • is the symbol for the multiplication operator, and wherein any non-mteger product of x n and y is rounded down to the nearest integer prior to subtracting it from x n . (2) Polypeptide embodiments further include an isolated polypeptide comprising a polypeptide having at least a 50,60, 70, 80, 85, 90, 95, 97 or 100% identity to a polypeptide reference sequence of SEQ ID NO:2, wherein said polypeptide sequence may be identical to the reference sequence of SEQ ID NO.2 or may include up to a certain integer number of ammo acid alterations as compared to the reference sequence, wherein said alterations are selected from the group consisting of at least one ammo acid deletion, substitution, including conservative and non-conservative substitution, or insertion, and wherein said alterations may occur at the ammo- or carboxy-termmal positions of the reference polypeptide sequence or anywhere between those terminal positions, interspersed either individually among the amino acids m the reference sequence or in one or more contiguous groups withm the reference sequence, and wherein said number of ammo acid alterations is determined by multiplying the total number of ammo acids in SEQ ID NO:2 by the integer defining the percent identity divided by 100 and then subtracting that product from said total number of ammo acids in SEQ ID NO:2, or: n a < x a - (x a • y), wherein n a is the number of ammo acid alterations, x a is the total number of ammo acids in SEQ ID NO:2, y is 0.50 for 50%, 0.60 for 60%, 0.70 for 70%, 0.80 for 80%, 0.85 for 85%, 0.90 for 90%, 0.95 for 95%, 0.97 for 97% or 1.00 for 100%, and • is the symbol for the multiplication operator, and wherein any non-mteger product of x a and y is rounded down to the nearest integer prior to subtracting it from x a . By way of example, a polypeptide sequence of the present invention may be identical to the reference sequence of SEQ ID NO:2, that is it may be 100% identical, or it may include up to a certain integer number of ammo acid alterations as compared to the reference sequence such that the percent identity is less than 100% identity. Such alterations are selected from the group consisting of at least one ammo acid deletion, substitution, including conservative and non-conservative substitution, or insertion, and wherein said alterations may occur at the amino- or carboxy-termmal positions of the reference polypeptide sequence or anywhere between those terminal positions, interspersed either individually among the ammo acids in the reference sequence or in one or more contiguous groups within the reference sequence. The number of ammo acid alterations for a given % identity is determined by multiplying the total number of amino acids SEQ ID N0:2 by the integer defining the percent identity divided by 100 and then subtracting that product from said total number of amino acids m SEQ ID NO:2, or n a ≤ x a " ( x a • Y)» wherein n a is the number of ammo acid alterations, x a is the total number of ammo acids m SEQ ID NO.2, y is, for instance 0.70 for 70%, 0.80 for 80%, 0.85 for 85% etc, and • is the symbol for the multiplication operator, and wherein any non-mteger product of x a and y is rounded down to the nearest integer prior to subtracting it from x a . "Immunologically equivalent deπvatιve(s)" as used herein encompasses a polypeptide, polynucleotide, or the equivalent of either which when used in a suitable formulation to raise antibodies in a vertebrate, the antibodies act to interfere with the immediate physical interaction between pathogen and mammalian host. "Immunospecific" means that characteπstic of an antibody whereby it possesses substantially greater affinity for the polypeptides of the invention or the polynucleotides of the invention than its affinity for other related polypeptides or polynucleotides respectively, particularly those polypeptides and polynucleotides in the pnor art. 'Tndιvιdual(s)" means a multicellular eukaryote, including, but not limited to a metazoan, a mammal, an ovid, a bovid, a simian, a pπmate, and a human "Isolated" means altered "by the hand of man" from its natural state, i.e., if it occurs in nature, it has been changed or removed from its ongmal environment, or both. For example, a polynucleotide or a polypeptide naturally present in a living organism is not "isolated," but the same polynucleotide or polypeptide separated from the coexisting mateπals of its natural state is "isolated", as the term is employed herein. Moreover, a polynucleotide or polypeptide that is introduced into an organism by transformation, genetic manipulation or by any other recombinant method is "isolated" even if it is still present in said organism, which organism may be living or non-living. "Organιsm(s)" means a (l) prokaryote, including but not limited to, a member of the genus Streptococcus, Staphylococcus, Bordetella, Corynebactenum, Mycobacterium, Neisseria, Haemophilus, Actinomycetes, Streptomycetes, Nocardia, Enter obacter, Yersima, Fancisella, Pasturella, Moraxella, Acinetobacter, Erysipelothrix, Branhamella, Actinobacillus, Streptobacillus, Listeria, Calymmatobacterium, Brucella, Bacillus, Clostridium, Treponema, Escherichia, Salmonella, Kleibsiella, Vibrio, Proteus, Erwinia, Borreha, Leptospira, Spirillum, Campylobacter, Shigella, Legwnella, Pseudomonas, Aeromonas, Rickettsia, Chlamydia, Borreha and Mycoplasma, and further including, but not limited to, a member of the species or group, Group A Streptococcus, Group B Streptococcus, Group C Streptococcus, Group D Streptococcus, Group G Streptococcus, Streptococcus pneumoniae, Streptococcus pyogenes, Streptococcus agalactiae, Streptococcus faecahs, Streptococcus faecium, Streptococcus durans, Neisseria gonorrheae, Neisseria meningitidis, Staphylococcus aureus, Staphylococcus epidermidis, Corynebacterium diptheriae, Gardnerella vaginahs, Mycobactenum tuberculosis, Mycobactermm bovis, Mycobactenum ulcerans, Mycobactenum leprae, Actinomyctes israelu, Listeria monocytogenes, Bordetella pertusis, Bordatella parapertusis, Bordetella bronchiseptica, Escherichia coli, Shigella dysenteriae, Haemophilus influenzae, Haemophilus aegyptius, Haemophilus parainfluenzae, Haemophilus ducreyi, Bordetella, Salmonella typhi, Citrobacter freundu, Proteus mirabihs, Proteus vulgaris, Yersima pestis, Kleibsiella pneumoniae, Serratia marcessens, Serratia liquefaciens, Vibrio cholera, Shigella dysenteru, Shigella flexneri, Pseudomonas aeruginosa, Franscisella tularensis, Brucella abortis, Bacillus anthracis, Bacillus cereus, Clostridium perfnngens, Clostridium tetani, Clostridium botuhnum, Treponema palhdum, Rickettsia rickettsii and Chlamydia trachomitis, (n) an archaeon, including but not limited to Archaebacter, and (in) a unicellular or filamentous eukaryote, including but not limited to, a protozoan, a fungus, a member of the genus Saccharomyces, Kluveromyces, or Candida, and a member of the species Saccharomyces cenviseae, Kluveromyces lactis, or Candida albicans. "Polynucleotιde(s)" generally refers to any polynbonucleotide or polydeoxynbonucleotide, which may be unmodified RNA or DNA or modified RNA or DNA. "Polynucleotιde(s)" include, without limitation, single- and double-stranded DNA, DNA that is a mixture of single- and double-stranded regions or single-, double- and tπple-stranded regions, single- and double-stranded RNA, and RNA that is mixture of single- and double-stranded regions, hybπd molecules compnsmg DNA and RNA that may be smgle-stranded or, more typically, double-stranded, or tπple-stranded regions, or a mixture of single- and double-stranded regions In addition, "polynucleotide" as used herein refers to tπple-stranded regions compnsmg RNA or DNA or both RNA and DNA The strands in such regions may be from the same molecule or from different molecules. The regions may include all of one or more of the molecules, but more typically involve only a region of some of the molecules One of the molecules of a tπple-hehcal region often is an oligonucleotide. As used herein, the term "polynucleotιde(s)" also includes DNAs or RNAs as descnbed above that contain one or more modified bases. Thus, DNAs or RNAs with backbones modified for stability or for other reasons are "polynucleotιde(s)" as that term is intended herein. Moreover, DNAs or RNAs compπsing unusual bases, such as inosine, or modified bases, such as tπtylated bases, to name just two examples, are polynucleotides as the term is used herein. It will be appreciated that a great vanety of modifications have been made to DNA and RNA that serve many useful puφoses known to those of skill in the art. The term "polynucleotιde(s)" as it is employed herein embraces such chemically, enzymatically or metabohcally modified forms of polynucleotides, as well as the chemical forms of DNA and RNA charactenstic of viruses and cells, including, for example, simple and complex cells "Polynucleotιde(s)" also embraces short polynucleotides often referred to as ohgonucleotιde(s). "Polypeptιde(s)" refers to any peptide or protein compnsmg two or more amino acids joined to each other by peptide bonds or modified peptide bonds. "Polypeptιde(s)" refers to both short chains, commonly referred to as peptides, ohgopeptides and ohgomers and to longer chains generally refeπed to as proteins. Polypeptides may contain amino acids other than the 20 gene encoded ammo acids. "Polypeptιde(s)" include those modified either by natural processes, such as processing and other post-translational modifications, but also by chemical modification techniques Such modifications are well descπbed m basic texts and in more detailed monographs, as well as in a voluminous research literature, and they are well known to those of skill m the art. It will be appreciated that the same type of modification may be present in the same or varying degree at several sites m a given polypeptide. Also, a given polypeptide may contain many types of modifications. Modifications can occur anywhere m a polypeptide, including the peptide backbone, the ammo acid side-chams, and the ammo or carboxyl termini. Modifications include, for example, acetylation, acylation, ADP-πbosylation, amidation, covalent attachment of flavin, covalent attachment of a heme moiety, covalent attachment of a nucleotide or nucleotide denvative, covalent attachment of a lipid or hpid deπvative, covalent attachment of phosphotidyhnositol, cross-hnkmg, cychzation, disulfide bond formation, demethylation, formation of covalent cross-links, formation of cysteine, formation of pyroglutamate, formylation, gamma-carboxylation, GPI anchor formation, hydroxylation, lodmation, methylation, myπstoylation, oxidation, proteolytic processing, phosphorylation, prenylation, racemization, glycosylation, lipid attachment, sulfation, gamma-carboxylation of glutamic acid residues, hydroxylation and ADP-πbosylation, selenoylation, sulfation, transfer-RNA mediated addition of ammo acids to proteins, such as argmylation, and ubiquitmation. See, for instance, PROTEINS - STRUCTURE AND MOLECULAR PROPERTIES, 2nd Ed, T. E Creighton, W. H. Freeman and Company, New York (1993) and Wold, F, Posttranslational Protein Modifications: Perspectives and Prospects, pgs. 1-12 in POSTTRANSLATIONAL COVALENT MODIFICATION OF PROTEINS, B. C. Johnson, Ed, Academic Press, New York (1983); Seifter et al, Meth Enzymol 182.626-646 (1990) and Rattan et al. Protein Synthesis Posttranslational Modifications and Aging, Ann. N.Y. Acad. Sci. 663: 48-62 (1992). Polypeptides may be branched or cyclic, with or without branching. Cyclic, branched and branched circular polypeptides may result from post-translational natural processes and may be made by entirely synthetic methods, as well. "Recombinant expression system(s)" refers to expression systems or portions thereof or polynucleotides of the invention introduced or transformed into a host cell or host cell lysate for the production of the polynucleotides and polypeptides of the invention. "Subtraction set" is one or more, but preferably less than 100, polynucleotides comprising at least one polynucleotide of the mvention "Vaπant(s)" as the term is used herein, is a polynucleotide or polypeptide that differs from a reference polynucleotide or polypeptide respectively, but retains essential properties. A typical variant of a polynucleotide differs m nucleotide sequence from another, reference polynucleotide. Changes m the nucleotide sequence of the vanant may or may not alter the amino acid sequence of a polypeptide encoded by the reference polynucleotide. Nucleotide changes may result in ammo acid substitutions, additions, deletions, fusion proteins and truncations in the polypeptide encoded by the reference sequence, as discussed below. A typical variant of a polypeptide differs in ammo acid sequence from another, reference polypeptide Generally, differences are limited so that the sequences of the reference polypeptide and the variant are closely similar overall and, in many regions, identical. A variant and reference polypeptide may differ in ammo acid sequence by one or more substitutions, additions, deletions m any combination. A substituted or inserted ammo acid residue may or may not be one encoded by the genetic code. The present invention also includes include vaπants of each of the polypeptides of the invention, that is polypeptides that vary from the referents by conservative ammo acid substitutions, whereby a residue is substituted by another with like characteπstics. Typical such substitutions are among Ala, Val, Leu and He; among Ser and Thr; among the acidic residues Asp and Glu; among Asn and Gin; and among the basic residues Lys and Arg; or aromatic residues Phe and Tyr. Particularly preferred are vaπants in which several, 5-10, 1-5, 1-3, 1-2 or 1 ammo acids are substituted, deleted, or added in any combination. A variant of a polynucleotide or polypeptide may be a naturally occumng such as an allelic variant, or it may be a variant that is not known to occur naturally. Non-naturally occumng variants of polynucleotides and polypeptides may be made by mutagenesis techniques, by direct synthesis, and by other recombinant methods known to skilled artisans. EXAMPLES The examples below are earned out using standard techniques, which are well known and routine to those of skill m the art, except where otherwise desenbed in detail. The examples are illustrative, but do not limit the invention Example 1 Strain selection, Library Production and Sequencing The polynucleotide having a DNA sequence given in Table 1 [SEQ ID NO: l or 3] was obtained from a library of clones of chromosomal DNA of Staphylococcus aureus in E. coli. The sequencing data from two or more clones containing overlapping Staphylococcus aureus DNAs was used to construct the contiguous DNA sequence m SEQ ID NO: 1. Libraries may be prepared by routine methods, for example: Methods 1 and 2 below. Total cellular DNA is isolated from Staphylococcus aureus WCUH 29 according to standard procedures and size-fractionated by either of two methods. Method 1 Total cellular DNA is mechanically sheared by passage through a needle in order to size-fractionate according to standard procedures. DNA fragments of up to l lkbp in size are rendered blunt by treatment with exonuclease and DNA polymerase, and EcoRI linkers added. Fragments are ligated into the vector Lambda ZapII that has been cut with EcoRI, the library packaged by standard procedures and E.coli infected with the packaged library. The library is amplified by standard procedures. Method 2 Total cellular DNA is partially hydrolyzed with a one or a combination of restriction enzymes appropriate to generate a series of fragments for cloning into library vectors (e.g, Rsal, Pall, Alul, Bshl235I), and such fragments are size-fractionated according to standard procedures EcoRI linkers are ligated to the DNA and the fragments then ligated into the vector Lambda ZapII that have been cut with EcoRI, the library packaged by standard procedures, and E coli infected with the packaged library. The library is amplified by standard procedures. Example 2 MurD Characterization Characterization of MurD Gene Expression Gene expression in vivo Recently several novel approaches have been described which puφort to follow global gene expression during infection (Chuang, S. et al, (1993), Mahan, M.J. et al. Science 259:686-688 (1993); Hensel, M. et al. Science 269:400-403 (1995). These new techniques have so far been demonstrated with gram negative pathogen infections but not with infections with gram positives presumably because the much slower development of global transposon mutagenesis and suitable vectors needed for these strategies m these organisms, and m the case of that process described by Chuang, S. et al, J. Bacteπol. 175:2026-2036 (1993) the difficulty of isolating suitable quantities of bacterial RNA free of mammalian RNA derived from the infected tissue to furnish bacterial RNA labeled to sufficiently high specific activity. The present invention employs a novel technology to determine gene expression in the pathogen at different stages of infection of the mammalian host. Use of the technology of the present invention enables identification of bacterial genes transcribed dunng infection, inhibitors of which would have utility m anti-bacterial therapy. Specific inhibitors of such gene transcription or of the subsequent translation of the resultant mRNA or of the function of the corresponding expressed proteins would have utility in anti- bacterial therapy. The determination of expression during infection of a gene from Staphylococcus aureus WCUH29 Necrotic fatty tissue from a four day grom infection or kidney from a seven day pyelonephritis infection of Staphylococcus aureus WCUH29 in the mouse is efficiently disrupted and processed m the presence of acid phenol and detergent to provide a mixture of animal and bacterial RNA. By freezing the tissue immediately in liquid nitrogen, and processing the tissue samples while still frozen, changes in the population of bacterial mRNA is minimized The resultant total RNA is free of DNA and protein (including RNAases and DNAases) The optimal conditions for disruption and processing to give high yields of bacterial mRNA with transcnpts of long length are followed by reverse transcribing the resulting mRNA to cDNA and amplified with ORF-specific primers for a bacterial gene known to be expressed constitutively and at low copy number in Staphylococcus aureus WCUH29. Aspects of this example II, part b, are modifications of a published protocol (Cheung, et al.; Anal Biochem (1994) 222:511-514). a) Isolation of tissue infected with Staphylococcus aureus WCUH29 from murine models of infection i) Isolation of tissue infected with Staphylococcus aureus WCUH29 from a muπne thigh lesion model of infection. 10 ml volumes of sterile nutrient broth (No.2 Oxoid) are seeded with isolated, individual colonies of Staphylococcus aureus WCUH29 from an agar culture plate The cultures are incubated aerobically (static culture) at 37°C for 16-20 hours . 4 week old mice (female, 18g-22g, strain MF1) are each infected by subcutaneous injection of 0.5ml. of this broth culture of Staphylococcus aureus WCUH29 (diluted in broth to approximately 108 cfu/ml.) into the anterior , πght lower quadrant (grom area). Mice should be monitored regularly during the first 24 hours after infection, then daily until termination of study. Animals with signs of systemic infection, i.e. lethargy, ruffled appearance, isolation from group, should be monitored closely and if signs progress to moπbundancy, the animal should be culled immediately. Visible external signs of lesion development will be seen 24-48h after infection. Examination of the abdomen of the animal will show the raised outline of the abscess beneath the skin. The localised lesion should remain in the right lower quadrant, but may occasionally spread to the left lower quadrant, and supenorly to the thorax. On occasions, the abscess may rupture through the overlying skm layers. In such cases the affected animal should be culled immediately and the tissues sampled if possible. Failure to cull the animal may result m the necrotic skm tissue overlying the abscess being sloughed off, exposing the abdominal muscle wall. Approximately 96 hours after infection, animals are killed using carbon dioxide asphyxiation To minimise delay between death and tissue processing /storage, mice should be killed individually rather than in groups.The dead animal is placed onto its back and the fur swabbed liberally with 70% alcohol. An initial incision using scissors is made through the skm of the abdominal left lower quadrant, travelling superiorly up to, then across the thorax. The incision is completed by cutting mfeπorly to the abdominal lower right quadrant. Care should be taken not to penetrate the abdominal wall. Holding the skm flap with forceps, the skm is gently pulled way from the abdomen. The exposed abscess, which covers the peritoneal wall but generally does not penetrate the muscle sheet completely, is excised, taking care not to puncture the viscera The abscess/muscle sheet and other infected tissue may require cutting in sections, prior to flash- freezing in liquid nitrogen, thereby allowing easier storage in plastic collecting vials. n) Isolation of tissue infected with Staphylococcus aureus WCUH29 from a munne model of hematogenous pyelonephritis Overnight cultures of S aureus WCUH29 were started from single colonies m 5 ml of tryptic soy broth (TSB) and grown at 37C with shaking. The cultures were then washed twice in sterile phosphate-buffered saline (PBS) and diluted to an A600 = 0.3. Male CD-I mice (18 - 20g) were infected with 0.2 ml of this suspension by tail vein inoculation using a 30g needle attached to a tuberculin syringe. Each mouse receives approximately 4 x 10 ' bacteria m this fashion. Mice are monitored daily for signs of illness, and usually withm 48 hours show signs of lethargy, ruffled fur, sluggishness; animals which appear moribund are euthanized prior to the end of the experiment. All animals are euthanized via carbon dioxide overdose seven days post-mfection. The animal is placed on its back and swabbed with ethanol, and then with RNAZap, and instruments are swabbed as well. The abdominal cavity is opened and the kidneys aseptically removed, cut into four pieces, and placed in cryovials which are immediately frozen in liquid nitrogen. b) Isolation of Staphylococcus aureus WCUH29 RNA from infected tissue samples Infected tissue samples, in 2-ml cryo-strorage tubes, are removed from liquid nitrogen storage for immediate processing of the frozen tissue. In a microbiological safety cabinet the samples are disrupted up to eight at a time. To disrupt the bacteria withm the tissue sample, 50- 100 mg of the tissue is transfered to a FastRNA tube containing a silica/ceramic matnx (BIO101) Immediately, 1 ml of extraction reagents (FastRNA reagents, BIO101) are added to give a sample to reagent volume ratio of approximately 1 to 20. The tubes are shaken in a reciprocating shaker (FastPrep FP120, BIO101) at a setting of 5.5 to 6 for 20-120 sec. The crude RNA preparation is extracted with chloroform/isoamyl alcohol, and precipitated with DEPC-treated/Isopropanol Precipitation Solution (BIO101). RNA preparations are stored in this isopropanol solution at -80°C if necessary. The RNA is pelleted (12,000g for 10 mm.), washed with 75% ethanol (v/v in DEPC-treated water), air-dried for 5-10 min, and resuspended m 0 1 ml of DEPC-treated water. Quality of the RNA isolated is assessed by the ability to detect bacterial transcnpts up to 2 kb m length by RT-PCR (as descπbed in section below). To demonstrate the isolation of bacterial RNA from the infected tissue, samples of RNA are reverse transcribed, and the presence of a constitutively expressed gene is detected through the use of quantitative PCR in the presence of a TaqMan probe (as described below). c) The removal of DNA from Staphylococcus aureus WCUH29-deπved RNA DNA is removed from 50 microgram samples of RNA by a 30 minute treatment at 37°C with 10 units of RNAase-free DNAasel (GeneHunter) m the buffer supplied in a final volume of 57 microhters. The DNAase is inactivated and removed by pheno chloroform extraction. RNA is precipitated with 5 microhters of 3 M NaOAc and 200 microhters 100% EtOH, and pelleted by centrifugation at 12,000g for 10 minutes. The RNA is pelleted (12,000g for 10 mm.), washed with 75%) ethanol (v/v in DEPC-treated water), air-dried for 5-10 min, and resuspended in 10- 20 microhters of DEPC-treated water RNA yield is quantitated by OD260 after 1 :1000 dilution of the cleaned RNA sample RNA is stored at -80°C if necessary and reverse- transcribed withm one week. d) The preparation of cDNA from RNA samples derived from infected tissue 10 microhter samples of DNAase treated RNA are reverse transcribed using.a Superscript Preamplification System for First Strand cDNA Synthesis kit (Gibco BRL, Life Technologies) according to the manufacturers instructions. 1 nanogram of random hexamers is used to prime each reaction Controls without the addition of SuperScπptll reverse transcriptase are also run. Both +/-RT samples are treated with RNaseH before proceeding to the PCR reaction . e) The use of PCR to determine the quality of bacterial RNA derived from infected tissue Long transcripts, which are expected to be of low copy number withm the bacteπal cell, such as penicillm-bmdmg protein 2 (PBP2), are reverse transcribed with random primers as descπbed above and amplified by the following PCR method using ORF-specific primers, in order to ascertain the quality, represented by length amplified, of the mRNA obtained dunng extraction and purification PCR reactions are set up on ice in 0.2 ml tubes m a total volume of 50 ul by adding the following components [final concentration] AmpliTaq PCR Buffer II (IX), 1.5mM MgCL2, 1 M dNTPs, 0.5uM forward primer, 0.5uM reverse primer, and 2 ul reverse-transcribed RNA. PCR reactions are run on a PE GeneAmp PCR System 9600 with an initial step of 94°C for 2mm, followed by 35 cycles of 94 °C for 30sec, 42 °C for 30sec and 72 °C for 30sec, followed by a final extensison at 72 °C for 7mιn. f) The use of PCR to determine the presence of a bacterial cDNA species PCR reactions are set up as described above using 0.5 microM each of the ORF specific forward and reverse primers. PCR product in 20 microhter ahquots are separated by electrophoresis through 1 to 1.5% 1 x TBE agarose gels or 10% lx TBE acrylamide gels. PCR product is visualized by staining the gel with ethidium bromide. Size estimates are made by comparison to a 100 bp DNA Ladder (Gibco BRL, Life Technologies). Alternatively, if the PCR products are conveniently labeled by the use of a labeled PCR primer (e.g. labeled at the 5' end with a dye) a suitable aliquot of the PCR product is run out on a polyacrylamide sequencing gel and its presence and quantity detected using a suitable gel scanning system (e.g. ABI PπsmTM 377 Sequencer using GeneScanTM software as supplied by Perkin Elmer). RT/PCR controls may include +/- reverse transcriptase reactions, 16s rRNA primers or DNA specific pnmer pairs designed to produce PCR products from non-transcπbed Staphylococcus aureus WCUH29 genomic sequences. To test the efficiency of the primer pairs they are used in DNA PCR with Staphylococcus aureus WCUH29 total DNA. PCR reactions are set up and run as described above using approx. 1 microgram of DNA in place of the cDNA and 35 cycles of PCR Primer pairs which fail to give the predicted sized product m either DNA PCR or RT/PCR are PCR failures and as such are unmformative. Of those which give the coπect size product with DNA PCR two classes are distinguished m RT/PCR: 1. Genes which are not transcribed m vivo reproducibly fail to give a product m RT/PCR; and 2.Genes which are transcribed in vivo reproducibly give the coπect size product m RT/PCR and show a stronger signal in the +RT samples than the signal (if at all present) in -RT controls. g) The use of PCR and fluorogenic probes to determine the presence of a bacterial cDNA species Specific sequence detection occurs by amplification of target sequences in the PE Applied Biosystems 7700 Sequence Detection System in the presence of an oligonucleotide probe labeled at the 5' and 3' ends with a reporter and quencher fluorescent dye, respectively (FQ probe), which anneals between the two PCR pnmers. Only specific product will be detected when the probe is bound between the primers. As PCR amplification proceeds, the 5'- nuclease activity of Taq polymerase initially cleaves the reporter dye from the probe. The signal generated when the reporter dye is physically separated from the quencher dye is detected by measuring the signal with an attached CCD camera. Each signal generated equals one probe cleaved which coπesponds to amplification of one target strand PCR reactions are set up using the PE Applied Biosystem TaqMan PCR Core Reagent Kit according to the instructions supplied such that each reaction contains 5 microhters 10X PCR Buffer II, 7 microhters 25 mM MgC12, 5 microhters 300 nM forward primer, 5 microhters reverse primer, 5 microhters specific FQ probe, 1 microhter each 10 mM dATP, 10 mM dCTP, 10 mM dGTP and 20 mM dUTP, 13.25 microhters distilled water, 0.5 microhters AmpErase UNG, and 0.25 microhters AmpliTaq DNA polymerase to give a total volume of 45 microhters. Amplification proceeds under the following thermal cycling conditions: 50°C hold for 2 minutes, 95°C hold for 10 minutes, 40 cycles of 95°C for 15 seconds and 60°C for 1 mmute, followed by a 25°C hold until sample is retrieved. Detection occurs real-time. Data is collected at the end of the reaction. Based on these analyses it was discovered that the Staphylococcus aureus murD gene was transcribed m vivo.

Claims: What is claimed is: 1. An isolated polypeptide selected from the group consisting of: (1) an isolated polypeptide comprising an ammo acid having at least (a) 70% identity; (b) 80% identity; (c) 90% identity; or (d) 95% identity to the ammo acid sequence of SEQ ID NO:2 or 4 over the entire length of SEQ ID NO:2 or 4; (n) an isolated polypeptide comprising the amino acid sequence of SEQ ID NO:2 or 4, (in) an isolated polypeptide which is the amino acid sequence of SEQ ID NO:2 or 4, and (iv) a polypeptide which is encoded by a recombinant polynucleotide comprising the polynucleotide sequence of SEQ ID NO: 1 or 3. 2 An isolated polynucleotide selected from the group consisting of: (l) an isolated polynucleotide compnsmg a polynucleotide sequence encodmg a polypeptide that has at least (a) 70% identity; (b) 80% identity; (c) 90% identity; or (d) 95%o identity; to the amino acid sequence of SEQ ID NO:2 or 4, over the entire length of SEQ ID NO:2 or 4; (π) an isolated polynucleotide compnsmg a polynucleotide sequence that has at least: (a) 70% identity (b) 80% identity; (c) 90% identity; or (d) 95% identity; over its entire length to a polynucleotide sequence encoding the polypeptide of SEQ ID NO.2 or 4; (m) an isolated polynucleotide compnsmg a nucleotide sequence which has at least: (a) 70% identity; (b) 80% identity; (c) 90% identity; or (d) 95% identity; to that of SEQ ID NO: 1 or 3 over the entire length of SEQ ID NO: 1 or 3, (iv) an isolated polynucleotide compnsmg a nucleotide sequence encodmg the polypeptide of SEQ ID NO.2 or 4; (v) an isolated polynucleotide which is the polynucleotide of SEQ ID NO' 1 or 3; (vi) an isolated polynucleotide obtainable by screening an appropriate library under stringent hybndization conditions with a probe having the sequence of SEQ ID NO:l or 3 or a fragment thereof; (vn) an isolated polynucleotide encoding a mature polypeptide expressed by the murD gene contained in the Staphylococcus aureus; and (vni) a polynucleotide sequence complementary to said isolated polynucleotide of (l), (n), (in), (iv), (v), (vi) or (vn). 3. An antibody antigenic to or lmmunospecific for the polypeptide of claim 1. 4 A method for the treatment of an individual: (I) in need of enhanced activity or expression of the polypeptide of claim 1 comprising the step of: (a) administering to the individual a therapeutically effective amount of an agonist to said polypeptide; or (b) providing to the individual an isolated polynucleotide compnsmg a polynucleotide sequence encoding said polypeptide in a form so as to effect production of said polypeptide activity in vivo; or (n) having need to inhibit activity or expression of the polypeptide of claim 1 comprising' (a) administering to the individual a therapeutically effective amount of an antagonist to said polypeptide; or (b) administering to the individual a nucleic acid molecule that inhibits the expression of a polynucleotide sequence encodmg said polypeptide; or (c) administering to the individual a therapeutically effective amount of a polypeptide that competes with said polypeptide for its ligand, substrate , or receptor. 5 A process for diagnosing or prognosmg a disease or a susceptibility to a disease in an individual related to expression or activity of the polypeptide of claim 1 m an individual comprising the step of: (a) determining the presence or absence of a mutation in the nucleotide sequence encoding said polypeptide m the genome of said individual; or (b) analyzing for the presence or amount of said polypeptide expression in a sample deπved from said individual. 6 A method for screening to identify compounds that activate or that inhibit the function of the polypeptide of claim 1 which compnses a method selected from the group consisting of: (a) measuring the binding of a candidate compound to the polypeptide or to the cells or membranes bearing the polypeptide or a fusion protein thereof by means of a label directly or indirectly associated with the candidate compound; (b) measuring the binding of a candidate compound to the polypeptide or to the cells or membranes bearing the polypeptide or a fusion protein thereof in the presence of a labeled competitor; (c) testing whether the candidate compound results m a signal generated by activation or inhibition of the polypeptide, using detection systems appropnate to the cells or cell membranes bearing the polypeptide; (d) mixing a candidate compound with a solution containing a polypeptide of claim 1 , to form a mixture, measuring activity of the polypeptide in the mixture, and comparing the activity of the mixture to a standard; (e) detecting the effect of a candidate compound on the production of mRNA encodmg said polypeptide and said polypeptide in cells, using for instance, an ELISA assay, or (f) (1) contacting a composition compnsmg the polypeptide with the compound to be screened under conditions to permit interaction between the compound and the polypeptide to assess the interaction of a compound, such interaction being associated with a second component capable of providing a detectable signal m response to the interaction of the polypeptide with the compound; and (2) determining whether the compound interacts with and activates or inhibits an activity of the polypeptide by detecting the presence or absence of a signal generated from the interaction of the compound with the polypeptide. 7 An agonist or an antagonist of the activity or expression polypeptide of claim 1. 8 An expression system compnsmg a polynucleotide capable of producing a polypeptide of claim 1 when said expression system is present in a compatible host cell. 9 A host cell comprising the expression system of claim 8 or a membrane thereof expressing a polypeptide selected from the group consisting of: (l) an isolated polypeptide comprising an ammo acid sequence selected from the group having at least: (a) 70% identity; (b) 80% identity; (c) 90%) identity; or (d) 95% identity to the ammo acid sequence of SEQ ID NO:2 or 4 over the entire length of SEQ ID NO:2 or 4; (n) an isolated polypeptide compnsmg the ammo acid sequence of SEQ ID NO:2 or 4; (in) an isolated polypeptide which is the ammo acid sequence of SEQ ID NO:2 or 4, and (iv) a polypeptide which is encoded by a recombinant polynucleotide compnsmg the polynucleotide sequence of SEQ ID NO:l or 3. 10 A process for producing a polypeptide selected from the group consisting of: (1) an isolated polypeptide comprising an ammo acid sequence selected from the group having at least: (a) 70% identity; (b) 80% identity; (c) 90% identity; or (d) 95% identity to the ammo acid sequence of SEQ ID NO:2 or 4 over the entire length of SEQ ID NO:2 or 4; (n) an isolated polypeptide comprising the amino acid sequence of SEQ ID NO:2 or 4; (in) an isolated polypeptide which is the ammo acid sequence of SEQ ID NO:2 or 4, and (iv) a polypeptide which is encoded by a recombinant polynucleotide comprising the polynucleotide sequence of SEQ ID NO: l or 3, compnsmg the step of culturmg a host cell of claim 9 under conditions sufficient for the production of said polypeptide. 11. A process for producing a host cell comprising the expression system of claim 8 or a membrane thereof expressing a polypeptide selected from the group consisting of: (I) an isolated polypeptide comprising an ammo acid sequence selected from the group having at least: (a) 70% identity; (b) 80% identity; (c) 90% identity; or (d) 95% identity to the ammo acid sequence of SEQ ID NO:2 or 4 over the entire length of SEQ ID NO:2 or 4; (π) an isolated polypeptide comprising the ammo acid sequence of SEQ ID NO:2 or 4; (in) an isolated polypeptide which is the ammo acid sequence of SEQ ID NO:2 or 4, and (iv) a polypeptide which is encoded by a recombinant polynucleotide comprising the polynucleotide sequence of SEQ ID NO: l or 3, said process compπsing the step of transforming or transfecting a cell with an expression system comprising a polynucleotide capable of producing said polypeptide of (1), (n), (in) or (iv) when said expression system is present m a compatible host cell such the host cell, under appropriate culture conditions, produces said polypeptide of (1), (n), (in) or (iv). 12. A host cell produced by the process of claim 11 or a membrane thereof expressing a polypeptide selected from the group consisting of. (i) an isolated polypeptide comprising an ammo acid sequence selected from the group having at least- (a) 70% identity; (b) 80% identity; (c) 90% identity; or (d) 95% identity to the ammo acid sequence of SEQ ID NO:2 or 4 over the entire length of SEQ ID NO:2 or 4; (n) an isolated polypeptide comprising the ammo acid sequence of SEQ ID NO:2 or 4; (in) an isolated polypeptide which is the ammo acid sequence of SEQ ID NO:2 or 4, and (iv) a polypeptide which is encoded by a recombinant polynucleotide comprising the polynucleotide sequence of SEQ ID NO:l or 3. 13 A computer readable medium having stored thereon a member selected from the group consisting of: a polynucleotide comprising the sequence of SEQ ID NO:l or 3; a polypeptide comprising the sequence of SEQ ID NO:2 or 4; a set of polynucleotide sequences wherein at least one of said sequences comprises the sequence of SEQ ID NO: 1 or 3; a set of polypeptide sequences wherein at least one of said sequences compnses the sequence ofSEQ ID NO:2 or 4; a data set representing a polynucleotide sequence comprising the sequence of SEQ ID NO: l or 3; a data set representing a polynucleotide sequence encodmg a polypeptide sequence comprising the sequence of SEQ ID NO:2 or 4; a polynucleotide compnsmg the sequence of SEQ ID NO.1 or 3, a polypeptide comprising the sequence of SEQ ID NO:2 or 4; a set of polynucleotide sequences wherein at least one of said sequences comprises the sequence of SEQ ID NO:l or 3; a set of polypeptide sequences wherein at least one of said sequences comprises the sequence of SEQ ID NO:2 or 4; a data set representing a polynucleotide sequence comprising the sequence of SEQ ID NO: 1 or 3; a data set representing a polynucleotide sequence encodmg a polypeptide sequence comprising the sequence of SEQ ID NO:2 or 4. 14. A computer based method for performing homology identification, said method comprising the steps of providing a polynucleotide sequence comprising the sequence of SEQ ID NO:l or 3 in a computer readable medium; and comparing said polynucleotide sequence to at least one polynucleotide or polypeptide sequence to identify homology. 15. A further embodiment of the invention provides a computer based method for polynucleotide assembly, said method comprising the steps of: providing a first polynucleotide sequence comprising the sequence of SEQ ID NO: 1 or 3 in a computer readable medium; and screening for at least one overlapping region between said first polynucleotide sequence and a second polynucleotide sequence. 16. An isolated polynucleotide selected form the group consisting of: (a) an isolated polynucleotide comprising a nucleotide sequence which has at least 70%, 80%, 90%, 95%, 97% identity to SEQ ID NO:3 over the entire length of SEQ ID NO: 3; (b) an isolated polynucleotide comprising the polynucleotide of SEQ ID NO:3; (c) the polynucleotide of SEQ ID NO:3; or (d) an isolated polynucleotide comprising a nucleotide sequence encoding a polypeptide which has at least 70%, 80%, 90%, 95%, 97-99% identity to the ammo acid sequence of SEQ ID NO:4, over the entire length of SEQ ID NO:4. 17. A polypeptide selected from the group consisting of: (a) a polypeptide which comprises an ammo acid sequence which has at least 70%, 80%, 90%, 95%, 97-99% identity to that of SEQ ID NO:4 over the entire length of SEQ ID NO:4; (b) a polypeptide which has an ammo acid sequence which is at least 70%, 80%, 90%, 95%, 97-99% identity to the ammo acid sequence of SEQ ID NO:4 over the entire length of SEQ ID NO:4; (c) a polypeptide which comprises the ammo acid of SEQ ID NO:4; (d) a polypeptide which is the polypeptide of SEQ ID NO:4; (e) a polypeptide which is encoded by a polynucleotide comprising the sequence contained in SEQ ID NO:3. 18 A polynucleotide consisting of a polynucleotide of the formula: X-(R 1 ) m -(R 2 )-(R 3 ) n -Y wherein, at the 5' end of the molecule, X is hydrogen, a metal or a modified nucleotide residue, or together with Y defines a covalent bond, and at the 3' end of the molecule, Y is hydrogen, a metal, or a modified nucleotide residue, or together with X defines the covalent bond, each occuπence of R and R3 is independently any nucleic acid residue or modified nucleic acid residue, m is an integer between 1 and 3000 or zero , n is an integer between 1 and 3000 or zero, and R 2 is a nucleic acid sequence or modified nucleic acid sequence set forth in SEQ ID NO: l or 3.

Inventors: BEATTIE DAVID T, DERESIEWICZ ROBERT L, HODGSON JOHN E, LONETTO MICHAEL A, LOWE ADRIAN, NICHOLAS RICHARD O, PALMER LESLIE, PRATT JULIE M, BEATTIE, DAVID, T., DERESIEWICZ, ROBERT, L., HODGSON, JOHN, E., LONETTO, MICHAEL, A., LOWE, ADRIAN, NICHOLAS, RICHARD, O., PALMER, LESLIE, PRATT, JULIE, M.
Applicants: BEATTIE DAVID T, BRIGHAM & WOME S HOSPITAL, DERESIEWICZ ROBERT L, HODGSON JOHN E, LONETTO MICHAEL A, LOWE ADRIAN, NICHOLAS RICHARD O, PALMER LESLIE, PRATT JULIE M, SMITHKLINE BEECHAM CORP, SMITHKLINE BEECHAM PLC, VIRUS RES INST, BEATTIE, DAVID, T., BRIGHAM & WOME 'S HOSPITAL, DERESIEWICZ, ROBERT, L., HODGSON, JOHN, E., LONETTO, MICHAEL, A., LOWE, ADRIAN, NICHOLAS, RICHARD, O., PALMER, LESLIE, PRATT, JULIE, M., SMITHKLINE BEECHAM CORPORATION, VIRUS RESEARCH INSTITUTE
Application year: 1998
Main classification: A61K38
IPC codes: A61K38, A61K45, A61P31, A61P43, C07K14, C07K16, C12N5, C12N9, C12N15, C12P21, C12Q1, G01N33