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  • Title: Production of new anthracycline antibiotics by microbial 4-O-methylation using a specific daunorubicin-negative mutant.
    Author: Johdo O, Tone H, Okamoto R, Yoshimoto A, Takeuchi T.
    Journal: J Antibiot (Tokyo); 1992 Dec; 45(12):1837-47. PubMed ID: 1490874.
    Abstract:
    Microbial 4-O-methylation using a specific daunorubicin-blocked, nonproducing mutant provided the new anthracycline antibiotics 4-O-methylbetaclamycin T, 4-O-methylyellamycin A and 4-O-methyl-13-hydroxyoxaunomycin, from which 4-O-methyloxaunomycin and 4-O-methyl-6-deoxyoxaunomycin were then prepared by further photochemical N-demethylation. Antitumor activities in vitro and in vivo against L1210 cells were compared with those of their 4-O-demethyl derivatives. It was found that all the 4-O-methyl derivatives had a markedly reduced cytotoxicity in vitro as compared with the 4-O-demethyl compounds. However, some of them were endowed with a significantly improved antitumor activity in vivo.
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