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. DnrQ is required for the glycosylation of epsilon-rhodomycinone by DnrS to yield rhodomycin D. Belongs to the cytochrome P450 family. Although DnrQ shows significant similarity to cytochrome P450 family, it lacks the heme-binding sites. The conservation of amino acid sequence is confined primarily to the C-terminal half of the protein.