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A genetic selection reveals functional metastable structures embedded in a toxin-encoding mRNA.

Sara Masachis1, Nicolas J Tourasse1, Claire Lays1

  • 1University of Bordeaux, INSERM U1212, CNRS UMR 5320, ARNA Laboratory, Bordeaux, France.

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|August 15, 2019
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Summary

Bacterial type I toxin-antitoxin systems use mRNA folding to control toxin expression. Mutations stabilize structures that block translation, revealing co-transcriptional regulation in Helicobacter pylori.

Keywords:
Helicobacter pylorichromosomesgene expressiongeneticsgenomicsmRNA foldingtoxin antitoxin

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • Post-transcriptional regulation fine-tunes bacterial gene expression.
  • Type I toxin-antitoxin (TA) systems rely on toxin mRNA folding for regulation.

Purpose of the Study:

  • To investigate the molecular mechanisms regulating a type I TA system in Helicobacter pylori.
  • To identify genetic mutations affecting TA system regulation.

Main Methods:

  • Genetic screening using lethality induced by antitoxin inactivation.
  • Analysis of point mutations in the 5' untranslated region and open reading frame of the toxin mRNA.
  • Assessment of toxin translation inhibition via mRNA structure stabilization.

Main Results:

  • Single point mutations were sufficient to suppress TA system toxicity.
  • Mutations stabilized stem-loop structures in the toxin mRNA, sequestering the Shine-Dalgarno sequence.
  • This sequestration inhibited toxin translation.

Conclusions:

  • Co-transcriptional inhibition of translation is a regulatory mechanism in bacterial TA systems.
  • Metastable hairpin structures formed during transcription prevent premature toxin expression.
  • This study elucidates a novel regulatory layer for type I TA systems in H. pylori.