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- W1736691240 abstract "Virginiamycin M inhibits both peptide bond formation and binding of aminoacyl-tRNA to bacterial ribosomes, and induces a lasting inactivation of the 50 S subunit (50 S). In the present work, the effects of this antibiotic on the acceptor and donor sites of peptidyltransferase have been explored, in the presence of virginiamycin M as well as after its removal. Virginiamycin M inhibited the binding of puromycin to ribosomes and reduced both the enzymatic and nonenzymatic binding of Phe-tRNA to the A site by inducing its release from the ribosomes (similar effects were observed with 50 S), whereas the antibiotic had no effect on the binding of unacylated tRNAPhe to the same site. Moreover, virginiamycin M caused Ac-Phe-tRNA or Phe-tRNA to be released from the ribosomal P site, when complexes were incubated with unacylated tRNA, elongation factor G, and GTP (similar finding with 50 S). Instead, peptide bond formation between Ac-Phe-tRNA positioned at the P site and Phe-tRNA at the A site was found to take place, albeit at a very low rate, in the presence of the antibiotic. The overall conclusion is that both the acceptor and donor substrate binding sites of the peptidyltransferase, which interact with the aminoacyl moiety of tRNA, are permanently altered upon transient contact of ribosomes with virginiamycin M." @default.
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- W1736691240 date "1984-08-01" @default.
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- W1736691240 title "The action of virginiamycin M on the acceptor, donor, and catalytic sites of peptidyltransferase." @default.
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- W1736691240 doi "https://doi.org/10.1016/s0021-9258(17)42737-2" @default.
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