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Related Experiment Videos

In vivo misreading by tRNA overdose.

F Navarro1, P Thuriaux

  • 1Service de Biochimie & Génétique Moléculaire, Gif sur Yvette, France.

RNA (New York, N.Y.)
|February 11, 2000
PubMed
Summary

A mutation in the essential Rpb5 subunit of RNA polymerase causes lethality at higher temperatures. Overexpressing a specific tRNA suppresses this, suggesting altered tRNA decoding and potential misreading errors.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The Rpb5 subunit is essential for all eukaryotic RNA polymerases.
  • A specific mutation, Rpb5-H147R, leads to temperature-sensitive lethality.
  • This mutation involves an AT-GC transition at a conserved site.

Purpose of the Study:

  • To investigate the genetic suppressors of the Rpb5-H147R temperature-sensitive mutation.
  • To elucidate the mechanism of suppression and its relation to tRNA function.
  • To understand the role of tRNA decoding in cellular viability.

Main Methods:

  • Genetic screening for dosage-dependent suppressors.
  • Analysis of tRNA gene copy number and expression.
  • Codon specificity analysis of suppression.
  • Investigating tRNA-codon interactions and wobble pairing.

Main Results:

  • Overexpression of tRNA(His)GUG rescues the lethal phenotype.
  • Suppression is specific to the CGC codon and dependent on tRNA(His)GUG concentration.
  • Overexpression of tRNA(Arg)ICG counteracts suppression.
  • The mechanism likely involves illegitimate U x G wobble pairing by tRNA(His)GUG.

Conclusions:

  • tRNA(His)GUG can decode the non-cognate CGC codon under specific conditions.
  • This aberrant decoding leads to competition with tRNA(Arg)ICG and potential misreading errors.
  • The findings highlight the importance of precise tRNA-codon recognition for cellular fidelity.

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