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Thiostrepton inhibits14 C-leucine incorporation by intact cells ofBacillus megaterium as well as14 C-phenylalanine incorporation by a poly U-directed extract ofEscherichia coli . Extracts ofE. 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.

Thiostrepton, an Inhibitor of 50 S Ribosome Subunit Function