Abstract
A spin-labeling study, with a nitroxide analog of N-ethylmaleimide, was carried out to investigate the effect of streptomycin on the conformation of ribosomes from E. coli. Spin-labeling of 70S ribosomes and 30S subunits was performed before and after the addition of streptomycin. Streptomycin has no effect if added after labeling, which confirms that the blocking of sulfhydryl groups of ribosomal proteins interferes with the binding of the antibiotic. However, when the antibiotic is added before labeling, there is a decrease in the rotational correlation time of the labels. This result indicates that the binding of streptomycin to ribosomes loosens the ribosomal structure.
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