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Effect of Structural and Stereochemical Methylproline Isomers on Actinomycin Biosynthesis

1968; American Society for Microbiology; Volume: 95; Issue: 3 Linguagem: Inglês

10.1128/jb.95.3.952-958.1968

1098-5530

Tadashi Yoshida, Anthony B. Mauger, Herbert Weissbach, Edward Katz,

Synthesis and Catalytic Reactions

The inhibitory effect of methylprolines on actinomycin biosynthesis by Streptomyces antibioticus was studied; the order of effectiveness was 3- >4- >5-methyl- dl -proline. Cis -3-methyl- dl -proline was 14 times more active than the trans isomer. It was also found that 4- and, possibly, 5-methylproline were incorporated into the actinomycin molecule. When 4-methylproline was present, three new actinomycins, representing 50 to 60% of the antibiotic mixture, were synthesized. Growth of the organism may be stimulated at concentrations (0.1 to 1.0 μg per ml) of 3-methylproline that inhibit antibiotic formation, thus providing additional evidence for a different mechanism of actinomycin synthesis from that of protein synthesis. Azetidine-2-carboxylic acid, piperdine-2-carboxylic acid, and hydroxyproline (but not sarcosine) reversed the inhibition due to 3-methylproline.