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Related Experiment Videos

Antibiotic uptake into gram-negative bacteria.

R E Hancock1, A Bell

  • 1Department of Microbiology, University of British Columbia, Vancouver, Canada.

European Journal of Clinical Microbiology & Infectious Diseases : Official Publication of the European Society of Clinical Microbiology
|December 1, 1988
PubMed
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Antibiotics must cross gram-negative bacterial membranes. While porins facilitate some antibiotic entry, non-porin pathways are crucial for drug uptake and overcoming resistance.

Area of Science:

  • Microbiology
  • Pharmacology
  • Biochemistry

Background:

  • Gram-negative bacteria possess outer and cytoplasmic membranes as diffusion barriers for antibiotics.
  • The outer membrane is a significant obstacle, with porins historically considered the primary route for antibiotic entry.

Purpose of the Study:

  • To review the mechanisms of antibiotic uptake across the outer membrane of gram-negative bacteria.
  • To highlight the significance of both porin-dependent and non-porin pathways in antibiotic diffusion.

Main Methods:

  • Analysis of minimum inhibitory concentration (MIC) studies on porin-deficient mutants versus parent strains.
  • Review of evidence supporting various non-porin antibiotic uptake pathways.

Main Results:

Related Experiment Videos

  • Porins are confirmed pathways for certain antibiotics, like beta-lactams.
  • Non-porin pathways, including self-promoted and hydrophobic routes, are vital for antibiotic uptake.
  • Evidence suggests poorly understood non-porin pathways are important for diverse antibiotics.

Conclusions:

  • Antibiotic diffusion into gram-negative bacteria involves multiple pathways across the outer membrane.
  • Understanding non-porin pathways is critical for developing new strategies against bacterial infections.