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. 1972 Mar;69(3):733–736. doi: 10.1073/pnas.69.3.733

Inhibition by Elongation Factor EF G of Aminoacyl-tRNA Binding to Ribosomes

Bartolomé Cabrer 1, David Vázquez 1, Juan Modolell 1
PMCID: PMC426546  PMID: 4551985

Abstract

Elongation factor G (EF G), bound to ribosomes either with GMPPCP or with fusidic acid and GDP, inhibits elongation factor Tu (EF Tu)-dependent binding of Phe-tRNA on the ribosome-poly(U) complex and binding of Ala-tRNA on the initiation complex formed with RNA from bacteriophage R17; GTP hydrolysis associated with Phe-tRNA binding is also inhibited. Moreover, nonenzymic binding of Phe-tRNA at high Mg++ concentration is completely blocked by EF G. Thus, EF G appears to bind at a site that overlaps or interacts with the ribosomal A-site.

Keywords: Millipore filter, EF Tu, GTPase, fusidic acid, GMPPCP

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Selected References

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