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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Synonymous codons, ribosome speed, and eukaryotic gene expression regulation.

Daniel Tarrant1, Tobias von der Haar

  • 1Kent Fungal Group, School of Biosciences, University of Kent, Canterbury, CT2 7NJ, UK.

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Summary

Gene expression is quantitatively controlled at multiple levels, including translation. Ribosome speed during translation elongation can regulate protein synthesis, impacting gene expression, especially in eukaryotic organisms.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Gene expression is quantitatively regulated at various stages, including translation.
  • Most known translational regulation targets the initiation phase.
  • Emerging evidence highlights the role of translation elongation in gene expression control.

Purpose of the Study:

  • To review molecular mechanisms governing ribosome speed in eukaryotes.
  • To discuss conditions under which translation elongation controls gene expression.
  • To explore the significance of elongation control in biological pathways.

Main Methods:

  • Literature review of molecular mechanisms controlling ribosome speed.
  • Analysis of rate parameters for translation initiation and elongation.
  • Discussion of experimental evidence for elongation control.

Main Results:

  • Translation elongation can limit protein production when initiation and elongation rates are incompatible.
  • Ribosome speed is determined by various molecular factors in eukaryotic systems.
  • Elongation control is a mechanism underlying several recently identified biological pathways.

Conclusions:

  • Translation elongation is a critical regulatory point for gene expression.
  • Understanding ribosome speed is key to comprehending translational control.
  • Elongation control offers a novel perspective on quantitative gene expression regulation.