Rapid ribosomal translocation depends on the conserved 18-55 base pair in P-site transfer RNA

Nature Structural & Molecular Biology
Dongli PanBarry S Cooperman

Abstract

The L shape of tRNA is stabilized by the 'tertiary core' region, which contains base-pairing interactions between the D and T loops. Distortions of the L shape accompany tRNA movement across the ribosomal surface. Here, using single-turnover rapid kinetics assays, we determine the effects of mutations within the tertiary core of P site-bound tRNA(fMet) on three measures of the rate of translocation, the part of the elongation cycle involving the most extensive tRNA movement. Mutations in the strictly conserved G18.U55 base pair result in as much as an 80-fold decrease in the rate of translocation, demonstrating the importance of the 18-55 interaction for rapid translocation. This implicates the core region as a locus for functionally important dynamic interactions with the ribosome and leads to the proposal that translocation of ribosome-bound tRNAs may be sequential rather than concerted.

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Citations

Dec 23, 2009·Quarterly Reviews of Biophysics·Xabier Agirrezabala, Joachim Frank
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