A novel antimutagenic factor, BA-2, active against UV-induced mutagenesis in Escherichia coli WP2 was isolated from the metabolites of Streptomyces sp. strain AJ9455. BA-2 also suppressed mutations induced by 4-nitroquinoline N-oxide (4-NQO) and furylfuramide (AF-2) in E. coli WP2s (uvrA) without any decrease of cellular viability. BA-2 strongly inhibited the UV induction of SOS repair functions when it was monitored by β-galactosidase activity expressed from the sulA::lacZ fusion gene of strain PQ37. It is assumed that the antimutagenic effect of BA-2 on mutagenesis induced by UV, 4-NQO or AF-2 was the result of inhibition of induction of the inducible error-prone SOS repair. The structure of BA-2 was considered to be N-methyl-valyl-amiclenomycin, and the structural unit of 4-amino-2,5-cyclohexadiene must be essential for the antimutagenic activity, since deamination by heating results in the loss of antimutagenic activity of BA-2. © 1993.
Yamada, T., Osawa, T., Kawakishi, S., Udaka, S., & Ohta, T. (1993). Antimutagenic effects of N-methyl-valyl-amiclenomycin (BA-2) isolated from the metabolites of Streptomyces sp. Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, 286(2), 293–297. https://doi.org/10.1016/0027-5107(93)90194-K