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Uncoupler-resistant mutants of bacteria.

T A Krulwich1, P G Quirk, A A Guffanti

  • 1Department of Biochemistry, Mount Sinai School of Medicine, City University of New York, New York 10029.

Microbiological Reviews
|March 1, 1990
PubMed
Summary

Uncoupler-resistant bacterial mutants challenge the chemiosmotic model. Bacillus mutants alter membrane lipids, while E. coli mutants may exclude uncouplers, impacting energy transduction.

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Area of Science:

  • Bioenergetics
  • Molecular Biology
  • Microbiology

Background:

  • The chemiosmotic model explains energy transduction via proton gradients, with uncouplers affecting oxidative phosphorylation by facilitating proton movement.
  • Uncoupler-resistant bacterial mutants present a challenge to this model, particularly those that do not exclude or inactivate uncouplers.

Purpose of the Study:

  • To investigate the bioenergetic properties of uncoupler-resistant bacterial mutants.
  • To reconcile the behavior of these mutants with the established chemiosmotic model of energy transduction.

Main Methods:

  • Analysis of uncoupler-resistant mutants in aerobic Bacillus species and Escherichia coli.
  • Characterization of membrane lipid composition and bioenergetic properties.
  • Investigation of uncoupler exclusion mechanisms in Escherichia coli.

Main Results:

  • Aerobic Bacillus species mutants exhibit altered membrane lipid profiles, challenging the chemiosmotic model.
  • Escherichia coli mutants demonstrate uncoupler exclusion, potentially under specific conditions.
  • The findings suggest diverse mechanisms of uncoupler resistance in bacteria.

Conclusions:

  • Uncoupler resistance in bacteria is not uniform and can involve distinct mechanisms, including lipid alterations and exclusion.
  • These findings necessitate a nuanced understanding of the chemiosmotic model's applicability across different bacterial systems.
  • Further research into membrane-active agents and their interactions is warranted.

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