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Streptomycin bactericidal action is dependent on polyamine endogenous levels in E. coli

G B Diniello1, I D Algranati, S H Goldemberg

  • 1Instituto de Investigaciones Bioquímicas Fundación Campomar, Buenos Aires, Argentina.

Cellular and Molecular Biology (Noisy-Le-Grand, France)
|June 10, 1998
PubMed
Summary

Polyamines enhance the bacterial cell

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Polyamines are essential cations in bacterial cells.
  • Their role in antibiotic resistance is not fully understood.

Purpose of the Study:

  • To investigate the effect of polyamines on bacterial susceptibility to antibiotics.
  • To elucidate the molecular mechanisms underlying this interaction.

Main Methods:

  • Bacterial cultures of E. coli were manipulated for polyamine levels (supplemented and depleted).
  • Survival rates after exposure to streptomycin and kanamycin were measured.
  • Pulse-labeling with 35S-methionine and subcellular fractionation were used to analyze protein synthesis.
  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was performed on protein fractions.

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Main Results:

  • Polyamines significantly increased the bactericidal effect of streptomycin and kanamycin.
  • Streptomycin treatment led to a 3-fold increase in newly synthesized proteins in the residual particulate fraction of polyamine-containing cells.
  • Polyamines influenced protein synthesis patterns in response to streptomycin, particularly in the residual fraction.
  • Polyamine-depleted cells showed minimal changes in protein synthesis upon antibiotic treatment.

Conclusions:

  • Polyamines enhance the bactericidal activity of antibiotics like streptomycin.
  • Polyamines may play a role in the conformation of the outer membrane and ribosome assembly, affecting antibiotic efficacy.
  • These findings suggest polyamines as potential targets for modulating antibiotic resistance.