Protein: Cytochrome P450 monooxygenase otaC (A2R6G9)
Organism: Aspergillus niger (strain ATCC MYA-4892 / CBS 513.88 / FGSC A1513)
Function: Cytochrome P450 monooxygenase; part of the gene cluster that mediates the biosynthesis of ochratoxin A (OTA), a mycotoxin composed of a chlorinated type I polyketide dihydroisocoumarin moiety linked to L-phenylalanine, and demonstrated to have nephrotoxic, immunotoxic, genotoxic, neurotoxic, and teratogenic properties. OtaC catalyzes the oxidation of 7-methylmellein (7-MM) into 7- carboxymellein (By similarity). The pathway begins with the highly reducing polyketide synthase otaA that catalyzes the formation of the isocoumarin group during the initial stages of biosynthesis, starting from one acetate and 4 malonate units, to originate the characteristic pentaketide skeleton 7-methylmellein (7-MM) of the OTA molecule. The newly identified cyclase otaY might be involved in the polyketide cyclization reaction during the initial steps of the OTA biosynthesis. 7-MM is then oxidized into 7-carboxymellein (also called ochratoxin beta) by the cytochrome P450 monooxygenase otaC. The NRPS encoded by the otaB gene is involved in the linking of phenylalanine to the dihydroisocoumarin ring. The reaction catalyzed by NRPS results in the production of ochratoxin B (OTB), which is the non-chlorinated analog of OTA and which subsequently serves as the substrate of the halogenase otaD for chlorination activity to form the final molecular structure of OTA, containing a chlorine atom in the C-5 position of the molecule (Probable)
Subcellular location: Membrane; Single-pass membrane protein
Sequence: MSIDTLLYTSLAVGAVYLASVALYELYWSPLAHIPGPKLAACTRLYEFFYDVVCGGQYTFKIADLHKQYGPIIRISPREIHIHDPNYYETLYATNSPRNKDPWFTAHFGVDESAFSTLDYRLHRSRRAMIAPFFAKARMDGAQPLIKANLAKLIRHLDAHASSQSVLKVEVAYNSFTGDVITGYTSYRSFEYLETTDMVPIWSETVRNLVESGMLSRHLPGFFPLLAWAGSRCIAAVYPKLLPVIAFRMKCAQEVNFMWTNSEEGKKEAIQSGCSEPALFPELVSRASSAPDITEERLLHEFITIVAAGTETTAHTMTVCTFHIAHNQSILDKLREELDNRFHSNADMDLQTLEQLPYLTGIIYEGLRLSYGLSHRLQRISPIDPLKYKDIAIPPNTPVGMSSALMHHDESIFPQSHEFIPERWTDPNDRRRLNKYMVSFSKGSRQCIGMNLAFAELYLGIATLFRRYDMKLHDTTLDDVQLHGDKMLPRAKNGSKGVRVTLRRAQSVG
InterPro domains: - IPR050121: Cytochrome P450 monooxygenase (family) [9-476]
- IPR017972: Cytochrome P450, conserved site (conserved_site) [440-449]
- IPR001128: Cytochrome P450 (family) [58-480]
- IPR002401: Cytochrome P450, E-class, group I (family) [297-470]
- IPR036396: Cytochrome P450 superfamily (homologous_superfamily) [26-506]
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0003824 (catalytic activity), GO:0016491 (oxidoreductase activity), GO:0004497 (monooxygenase activity)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0009987 (cellular process), GO:0009058 (biosynthetic process), GO:0044237 (cellular metabolic process), GO:0044281 (small molecule metabolic process), GO:0019748 (secondary metabolic process), GO:0071704 (organic substance metabolic process), GO:0044550 (secondary metabolite biosynthetic process), GO:0006575 (cellular modified amino acid metabolic process), GO:1901360 (organic cyclic compound metabolic process), GO:1901576 (organic substance biosynthetic process), GO:0044283 (small molecule biosynthetic process), GO:0046483 (heterocycle metabolic process), GO:0006082 (organic acid metabolic process), GO:0044249 (cellular biosynthetic process), GO:0006725 (cellular aromatic compound metabolic process), GO:1901362 (organic cyclic compound biosynthetic process), GO:0043436 (oxoacid metabolic process), GO:0016053 (organic acid biosynthetic process), GO:0019438 (aromatic compound biosynthetic process), GO:0018130 (heterocycle biosynthetic process), GO:1901617 (organic hydroxy compound biosynthetic process), GO:0042181 (ketone biosynthetic process), GO:0042537 (benzene-containing compound metabolic process), GO:0018958 (phenol-containing compound metabolic process), GO:0019752 (carboxylic acid metabolic process), GO:0046394 (carboxylic acid biosynthetic process), GO:0046189 (phenol-containing compound biosynthetic process), GO:0072330 (monocarboxylic acid biosynthetic process), GO:0032787 (monocarboxylic acid metabolic process)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0043229 (intracellular organelle), GO:0043227 (membrane-bounded organelle), GO:0043231 (intracellular membrane-bounded organelle)