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Updated: Jun 22, 2025

Studying Oxidative Stress Caused by the Mitis Group Streptococci in Caenorhabditis elegans
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Clostridioides difficile superoxide reductase mitigates oxygen sensitivity.

Rebecca Kochanowsky1, Katelyn Carothers1, Bryan Angelo P Roxas1

  • 1School of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, Arizona, USA.

Journal of Bacteriology
|July 2, 2024
PubMed
Summary
This summary is machine-generated.

Clostridioides difficile uses superoxide reductase (SOR) to defend against oxygen toxicity in the gut. This study confirms SOR

Keywords:
Clostridioides difficile superoxide reductaseredoxrubredoxin oxidoreductase

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Area of Science:

  • Microbiology
  • Pathogenesis
  • Biochemistry

Background:

  • Clostridioides difficile is a major healthcare-associated pathogen causing severe diarrheal disease.
  • While C. difficile is an anaerobe in vitro, it tolerates oxygen in the host gut.
  • The C. difficile genome encodes antioxidant proteins, including a predicted superoxide reductase (SOR).

Purpose of the Study:

  • To determine the enzymatic activity of C. difficile SOR.
  • To assess SOR's role in protecting C. difficile against oxygen exposure.
  • To investigate the impact of SOR on the C. difficile proteome under oxidative stress.

Main Methods:

  • Insertional inactivation of the sor gene in C. difficile.
  • Heterologous expression of C. difficile sor in Escherichia coli.
  • Proteomic analysis of a C. difficile sor mutant under oxygen stress.

Main Results:

  • A sor mutant was more sensitive to superoxide, confirming SOR's antioxidant role.
  • C. difficile SOR conferred protection against superoxide in E. coli and exhibited scavenging activity.
  • Oxygen stress induced global proteome changes in the C. difficile sor mutant.

Conclusions:

  • The enzymatic activity of C. difficile SOR is established.
  • SOR is crucial for protecting C. difficile against oxidative stress.
  • SOR influences the broader vegetative cell proteome of C. difficile under oxygen stress.