Thiostrepton, an Inhibitor of 50S Ribosome Subunit Function |
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| Authors: | B. Weisblum and V. Demohn |
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| Abstract: | Thiostrepton inhibits (14)C-leucine incorporation by intact cells of Bacillus megaterium as well as (14)C-phenylalanine incorporation by a poly U-directed extract of Escherichia coli. Extracts of E. coli which are pretreated by incubation with thiostrepton cannot be reactivated by dialysis to more than 5% of their former activity. The 50S ribosome subunit appears to be the site of thiostrepton action, since protein-synthesizing activity can be restored to dialyzed pretreated extracts by supplementation with 50S ribosome subunits but not with 30S ribosome subunits. This technique also provides a simple sensitive method for detection of the biological activity of very small amounts of 50S ribosome subunits. |
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