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. Catalyzes the addition of the TDP activated glycoside, L-daunosamine-TDP (2,3,6-trideoxy-3-aminohexose-TDP) at position C-7 of epsilon-rhodomycinone to yield rhodomycin D. Glycosylation is a prerequisite for biological activity of anthracyclines and requires DnrQ which seems to act as an activator. dTDP-beta-L-daunosamine + epsilon-rhodomycinone = dTDP + H(+) + rhodomycin D Antibiotic biosynthesis; daunorubicin biosynthesis. Antibiotic biosynthesis; carminomycin biosynthesis. Belongs to the glycosyltransferase 28 family.