PMID: 6160874Nov 11, 1980Paper

Nonenzymic translocation and spontaneous release of noncognate peptidyl transfer ribonucleic acid from Escherichia coli ribosomes

Biochemistry
M J Cabañas, J Modolell

Abstract

Poly(uridylic acid)-programmed ribosomes have been used to synthesize the noncognate peptidyl-tRNA Ac-Phe-Tyr-tRNATyr and its cognate counterpart Ac(Phe)2-tRNAPhe. After synthesis, Ac(Phe)2-tRNAPhe remains, as expected, in the ribosomal acceptor (A) site, but the noncognate AcPhe-Tyr-tRNATyr does not; part of it spontaneously falls off the ribosome and the rest translocates, without elongation factor (EF) G, to the ribosomal donor site. The inhibitor of translocation viomycin prevents both the spontaneous release and the nonenzymatic translocation by confining the noncognate peptidyl-tRNA to the A site. Under these conditions, the interaction of AcPhe-Tyr-tRNATyr with the A site appears to be similar to that of Ac(Phe)2-tRNAPhe without the antibiotic, and EF-G promotes the translocation and subsequent elongation of both peptidyl-tRNAs to comparable extents. The results indicate that, without viomycin, the noncognate peptidyl-tRNA is weakly held in the ribosomal A site and support the proposal that the release of peptidyl-tRNA occurring during protein synthesis in vivo is related to a ribosomal editing mechanism which discards mistranslated nascent proteins [Menninger, J. R. (1977) Mech. Ageing Dev. 6, 131].

References

Dec 1, 1977·European Journal of Biochemistry·J Modolell, Vázquez
Jul 1, 1979·Proceedings of the National Academy of Sciences of the United States of America·P C Jelenc, C G Kurland
Mar 1, 1977·Mechanisms of Ageing and Development·J R Menninger
Aug 14, 1978·Biochemical and Biophysical Research Communications·M J CabañasJ Modolell
Oct 1, 1979·European Journal of Biochemistry·S CampuzanoJ Modolell
May 1, 1972·Proceedings of the National Academy of Sciences of the United States of America·J F AtkinsL Gorini
Sep 1, 1974·FEBS Letters·L P GavrilovaA S Spirin
Jan 18, 1966·Biochimica Et Biophysica Acta·A L Haenni, F Chapeville
Oct 20, 1966·Biochemical and Biophysical Research Communications·P Leder, H Bursztyn

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Citations

Sep 10, 2003·The Journal of Biological Chemistry·Michael C KielAkira Kaji

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