PMID: 60235Jul 15, 1976Paper

Paromomycin and dihydrostreptomycin binding to Escherichia coli ribosomes

European Journal of Biochemistry
D LandoJ P Raymond

Abstract

Paromomycin binds specifically to a single type of binding site on the 70-S streptomycin-sensitive Escherichia coli ribosome. This site is different from that of dihydrostreptomycin since paromomycin binds to streptomycin-resistant ribosomes and sine dihydrostreptomycin does not compete for paromomycin binding. Paromomycin binding, unlike dihydrostreptomycin binding, is independent of changes in ribosome concentration but influenced by magnesium ion concentration. Moreover, paromomycin does not bind to the 30-S subunit of the streptomycin-sensitive ribosome, except in the presence of dihydrostreptomycin, which probably induces the conformational changes necessary for a paromomycin binding site. This induction does not occur with streptomycin-resistant ribosomes. Neither antibiotic binds to the 50-S subunit. In general, binding of the one antibiotic increases the number of sites available for binding of the other. Both antibiotics exhibit marked non-specific binding at high antibiotic/ribosome ratios. Competition studies have enabled the classification of other aminoglycosides according to their ability to compete for the paromomycin and dihydrostreptomycin binding sites. Derivatives structurally related to paromomycin compete f...Continue Reading

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