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A new type V toxin-antitoxin system where mRNA for toxin GhoT is cleaved by antitoxin GhoS

Xiaoxue Wang1, Dana M Lord, Hsin-Yao Cheng

  • 1Key Laboratory of Marine Bio-Resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China.

Nature Chemical Biology
|September 4, 2012
PubMed

Insights

Researchers discovered a new bacterial toxin-antitoxin system, GhoT-GhoS. The antitoxin GhoS neutralizes the toxin GhoT by specifically cleaving its mRNA, a novel mechanism for bacterial persistence.

Area of Science:

  • Bacteriology
  • Molecular Biology
  • Genetics

Background:

  • Bacterial toxin-antitoxin systems regulate cellular processes.
  • Antitoxins typically neutralize toxins through direct binding or degradation.
  • No previously identified antitoxin functioned by cleaving toxin mRNA.

Purpose of the Study:

  • To characterize a novel bacterial toxin-antitoxin system.
  • To elucidate the mechanism of action for the YjdO/YjdK system.
  • To identify the first antitoxin that inhibits its cognate toxin by cleaving toxin mRNA.

Main Methods:

  • In vitro RNA degradation assays.
  • Quantitative real-time reverse-transcription PCR (qRT-PCR).
  • Whole-transcriptome sequencing.
  • Alanine substitution mutations.
  • Nuclear Magnetic Resonance (NMR) structural analysis.

Main Results:

  • YjdO (GhoT) is a membrane lytic peptide inducing ghost cell formation and bacterial persistence.
  • YjdK (GhoS) neutralizes GhoT toxicity by specifically cleaving yjdO (ghoT) mRNA.
  • GhoS activity requires Arginine 28 and targets a U/A-rich cleavage site.
  • GhoS is a monomer structurally related to CRISPR-associated-2 RNases.

Conclusions:

  • The GhoT-GhoS system represents the first identified Type V toxin-antitoxin system.
  • This system demonstrates a novel antitoxin mechanism involving specific mRNA cleavage.
  • GhoS provides a new target for understanding and manipulating bacterial persistence and antibiotic tolerance.

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