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Area of Science:

  • Microbiology
  • Biochemistry
  • Cell Biology

Background:

  • Antibiotic efficacy often depends on reactive oxygen species (ROS) production, typically via the Fenton reaction.
  • Bacterial persister cells are dormant and tolerant to antibiotics, contributing to persistent infections.
  • Existing knowledge suggests ROS production requires enhanced respiration and the Fenton reaction.

Purpose of the Study:

  • To investigate an alternative mechanism for antibiotic-induced ROS production in dormant bacterial cells.
  • To explore the role of membrane depolarization in enhancing antibiotic activity against persister cells.
  • To identify the source of ROS production independent of the Fenton reaction.

Main Methods:

  • Utilized Bacillus subtilis in stationary phase as a model for dormant cells.
  • Pharmacologically induced membrane depolarization.
  • Performed genetic analyses to identify ROS-producing components.
  • Investigated changes in membrane protein distribution.

Main Results:

  • Pharmacological membrane depolarization enhanced antibiotic bactericidal activity and induced ROS production in dormant cells.
  • ROS production was primarily superoxide radicals and did not require the Fenton reaction.
  • The iron-sulfur subunit QcrA of respiratory complex III was identified as a key source of superoxide radicals.
  • Membrane depolarization altered QcrA distribution, suggesting respiratory complex III dissociation.

Conclusions:

  • Discovered an alternative antibiotic-induced ROS production pathway in dormant bacteria.
  • This mechanism involves superoxide radical generation from QcrA upon membrane depolarization.
  • Findings may explain the effectiveness of membrane-targeting antibiotics against persister cells.