Involved in the biosynthesis of the anthracyclines carminomycin and daunorubicin (daunomycin) which are aromatic polyketide antibiotics that exhibit high cytotoxicity and are widely applied in the chemotherapy of a variety of cancers. In vivo, DoxA catalyzes the C-13 hydroxylation of 13-deoxycarminomycin and 13-deoxydaunorubicin to yield 13-dihydrocarminomycin and 13-dihydrodaunorubicin, respectively, as well as the oxidation of these 13-dihydro-anthracyclines to their respective 13-keto forms, carminomycin and daunorubicin. In vitro, it also catalyzes the C-14 hydroxylation of daunorubicin to form doxorubicin (adriamycin), although this strain is not a doxorubicin producer. It is not able to accept anthracyclinones (aglycones) and anthracyclines with a 10-carbomethoxyl moiety. 13-oxidation of the anthracyclines possessing the 4-methoxy substitution is greatly favored. The anthracycline analog desacetyladriamycin can be oxidized to 10-hydroxydesacetyladriamycin. It can only use NADP. DoxA acts jointly with DauV.

Belongs to the cytochrome P450 family.

422 amino acids

MSGEAPRVAVDPFSCPMMTMQRKPEVHDAFREAGPVVEVNAPAGGPAWVITDDALAREVLADPRFVKDPDLAPTAWRGVDDGLDIPVPELRPFTLIAVDGEDHRRLRRIHAPAFNPRRLAERTDRIAAIADRLLTELADSSDRSGEPAELIGGFAYHFPLLVICELLGVPVTDPAMAREAVGVLKALGLGGPQSAGGDGTDPAGDVPDTSALESLLLEAVHAARRKDTRTMTRVLYERAQAEFGSVSDDQLVYMITGLIFAGHDTTGSFLGFLLAEVLAGRLAADADGDAISRFVEEALRHHPPVPYTLWRFAATEVVIRGVRLPRGAPVLVDIEGTNTDGRHHDAPHAFHPDRPSRRRLTFGDGPHYCIGEQLAQLESRTMIGVLRSRFPQARLAVPYEELRWCRKGAQTARLTDLPVWLR

46.1 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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