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Related Experiment Videos

Insights into the decoding mechanism from recent ribosome structures.

James M Ogle1, Andrew P Carter, V Ramakrishnan

  • 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK.

Trends in Biochemical Sciences
|May 27, 2003
PubMed
Summary

Ribosome accuracy in tRNA selection is higher than predicted. Antibiotics and mutations affect this accuracy by influencing small subunit domain closure during decoding.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Ribosome function is crucial for protein synthesis.
  • Transfer RNA (tRNA) selection accuracy exceeds simple codon-anticodon pairing predictions.
  • Antibiotics like streptomycin and paromomycin are known to modulate translation fidelity.

Purpose of the Study:

  • To elucidate the structural mechanisms underlying tRNA selection accuracy by the ribosome.
  • To understand how antibiotics and mutations impact ribosome fidelity.
  • To integrate structural data for a comprehensive view of the decoding process.

Main Methods:

  • Analysis of recent crystal structures of the ribosome.
  • Incorporation of cryoelectron microscopy (cryo-EM) data.

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  • Characterization of mutations affecting translational accuracy.

    • Main Results:

    • Specific base-pairing geometry recognition induces small subunit domain closure around cognate tRNA.
    • This domain closure is a key step triggering subsequent tRNA selection.
    • Antibiotics and mutations alter the favorability of this domain closure, modulating decoding accuracy.

    Conclusions:

    • A comprehensive structural understanding of ribosome-mediated tRNA selection is emerging.
    • Domain closure of the small ribosomal subunit is a critical determinant of decoding accuracy.
    • The findings provide insights into the mechanism of action for antibiotics and mutations affecting translation.