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• W2001411640 abstract "Virginiamycin S, a type B synergimycin inhibiting protein synthesis in bacteria, competes with erythromycin for binding to the 50S ribosomal subunits; the mechanism of action of the two antibiotics is unclear. Energy-transfer experiments between virginiamycin S (which is endowed with inherent fluorescence due to its hydroxypicolinyl moiety) and fluorescent coumarinyl derivatives of ribosomal proteins L7 and L10 have been carried out to locate the binding site of this antibiotic on the ribosome. Previous studies have indicated that two L7/L12 dimers can attach respectively to a strong binding site located on the central protuberance and to a weak binding site located on the stalk of the 50S subunits and that protein L10 is located at the base of the stalk. The distance between ribosome-bound virginiamycin S and a fluorophore located at the strong binding site of proteins L7/L12 (Lys-51 of L7) was found to be 56 (+/- 15) A. Virginiamycin S, on the other hand, was located at a distance exceeding 67 A from the weak binding site of L7/L12 dimers. A fluorophore positioned on the unique cysteine (Cys-70) of protein L10 and ribosome-bound virginiamycin S proved to be more than 60 A apart. From data available on the location of proteins L7/L12 and L10, a model is proposed, whereby the virginiamycin S binding site is placed at the base of the central protuberance of the 50S subunits, in proximity of the presumptive peptidyl transferase center. The binding sites of macrolides and lincosamides (related antibiotics of the MLS group) are expected to be very close to that of virginiamycin S." @default.
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• W2001411640 date "1986-06-01" @default.
• W2001411640 modified "2023-10-17" @default.
• W2001411640 title "Localization of virginiamycin S binding site on bacterial ribosome by fluorescence energy transfer" @default.
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• W2001411640 doi "https://doi.org/10.1021/bi00360a011" @default.
• W2001411640 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3087416" @default.
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