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Related Experiment Videos

Antisuppression by mutations in elongation factor Tu.

S Tapio1, L A Isaksson

  • 1Department of Microbiology, University of Uppsala, Sweden.

European Journal of Biochemistry
|March 10, 1990
PubMed
Summary
This summary is machine-generated.

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Altered elongation factor EF-Tu in Escherichia coli mutants (Ap and Aa) slows growth and translation by decreasing suppressor tRNA efficiency. EF-Tu mutations impact ribosome interactions, with combined mutations causing lethality at room temperature.

Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Elongation factor EF-Tu is crucial for protein synthesis.
  • Kirromycin resistance in Escherichia coli can arise from mutations in EF-Tu.
  • The tufB gene's role in EF-Tu function is essential.

Purpose of the Study:

  • Investigate the in vivo effects of two kirromycin-resistant EF-Tu mutants (Ap and Aa).
  • Analyze the impact of these EF-Tu alterations on translational elongation and suppressor tRNA function.
  • Determine the relationship between EF-Tu mutations, ribosomal interactions, and cellular growth.

Main Methods:

  • Studied two EF-Tu mutants (Ap and Aa) in Escherichia coli strains with an inactive tufB gene.
  • Assessed in vivo growth rates, translational elongation rates, and nonsense/missense suppression levels.

Related Experiment Videos

  • Investigated the combined effects of EF-Tu mutations with ribosomal mutations (rpsD12).

    • Main Results:

    • Both EF-Tu mutants exhibited slow growth rates correlated with decreased translational elongation.
    • Ap and Aa significantly reduced suppression levels for multiple nonsense and missense suppressor tRNAs.
    • A combination of tufA(Aa) and rpsD12 mutation was lethal at room temperature, showing an optimal growth temperature of 42°C.

    Conclusions:

    • Altered EF-Tu interactions with the ribosome contribute to decreased translational efficiency and altered suppressor tRNA function.
    • EF-Tu mutations significantly impact protein synthesis regulation in vivo.
    • Specific EF-Tu mutations can lead to temperature-sensitive phenotypes and lethality when combined with ribosomal mutations.