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, it acts jointly with DoxA in the conversion of 13-deoxycarminomycin and 13-deoxydaunorubicin to yield carminomycin and daunorubicin, respectively. In vitro, it also acts jointly with DoxA in the C-14 hydroxylation of daunorubicin to form doxorubicin, although this strain is not a doxorubicin producer. Antibiotic biosynthesis; daunorubicin biosynthesis. Antibiotic biosynthesis; carminomycin biosynthesis.