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. 1974 May;71(5):1634–1638. doi: 10.1073/pnas.71.5.1634

Selective Inhibition of Initiating Ribosomes by Spectinomycin

Brian J Wallace 1,*, Phang-Cheng Tai 1, Bernard D Davis 1
PMCID: PMC388291  PMID: 4275941

Abstract

Spectinomycin at low concentrations inhibits initiating ribosomes but not ribosomes already engaged in chain elongation. The initiating ribosomes are blocked in some step after formation of the initiation complex, probably the first translocation. Cells inhibited by spectinomycin accumulate polysomes, and these have proved to be unstable polyinitiation complexes: they can be pulse-labeled with methionine but not with valine, and they disappear after addition of rifampicin. Hence, the blocked ribosomes evidently are released and then reinitiate. In heterozygotes this cyclic reinitiation by the sensitive ribosomes, each blocking an initiation site for an average of 10-15 min, can explain (just as with streptomycin) the dominance of sensitivity over resistance.

Keywords: purified polysomes, initiation complexes, streptomycin, dominance of sensitivity

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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