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Polyamines decrease Escherichia coli outer membrane permeability

A L Dela Vega1, A H Delcour

  • 1Department of Biology, University of Houston, Texas 77204, USA.

Journal of Bacteriology
|July 1, 1996
PubMed
Summary

Polyamines like spermine inhibit gram-negative bacteria

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Gram-negative bacteria outer membranes control hydrophilic compound passage via porin channels.
  • Porin function is crucial for nutrient uptake and antibiotic permeation.
  • Polyamines are cellular compounds with diverse biological roles.

Purpose of the Study:

  • To investigate the impact of four polyamines on porin channel function in bacteria.
  • To assess polyamine effects on beta-lactam antibiotic permeability and bacterial chemotaxis.
  • To explore polyamines as potential modulators of outer membrane permeability.

Main Methods:

  • Tested effects of putrescine, cadaverine, spermidine, and spermine on bacterial systems.
  • Measured cephaloridine antibiotic permeation rates in live cells.
  • Assessed bacterial chemotaxis using swarm plates and capillary assays.

Main Results:

  • All tested polyamines inhibited both beta-lactam antibiotic flux and chemotaxis.
  • Inhibition varied with polyamine type and concentration, from submillimolar to tens of millimolar.
  • Both OmpC and OmpF porins were affected, with OmpC showing milder inhibition.

Conclusions:

  • Polyamines can inhibit porin-mediated processes, suggesting a potential binding site.
  • Porins may serve as targets for blocking agents, with polyamines acting as endogenous modulators.
  • This research highlights polyamines' role in regulating outer membrane permeability.

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