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Cell selectivity-membrane phospholipids relationship of the antimicrobial effects shown by pleurocidin enantiomeric

Juneyoung Lee1, Cana Park, Seong-Cheol Park

  • 1School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, Daegu 702-701, Korea.

Journal of Peptide Science : an Official Publication of the European Peptide Society
|July 17, 2009
PubMed

Insights

Pleurocidin (Ple) enantiomers show selective antimicrobial activity. The L-enantiomer targets bacteria, while the D-enantiomer is more effective against fungi, due to differing membrane lipid compositions.

Area of Science:

  • Antimicrobial Peptides
  • Molecular Biology
  • Biochemistry

Background:

  • Pleurocidin (Ple) enantiomers possess distinct antimicrobial properties.
  • Previous studies indicated differential activity against bacterial and fungal strains.

Purpose of the Study:

  • To investigate the mechanism of selective antimicrobial activity of Ple enantiomers.
  • To elucidate the role of membrane interaction in Ple enantiomer efficacy.

Main Methods:

  • Confocal laser scanning microscopy to observe cellular internalization.
  • Fluorescence analysis using 1,6-diphenyl-1,3,5-hexatriene.
  • Liposome assays with phospholipids mimicking bacterial and fungal membranes.

Main Results:

  • Ple enantiomers internalize into cell surfaces, suggesting a membrane-active mechanism.
  • L-Ple demonstrated greater antibacterial activity, while D-Ple showed enhanced antifungal activity.
  • Liposome leakage assays confirmed L-Ple's efficacy against bacterial membranes and D-Ple's against fungal membranes.

Conclusions:

  • The selective antimicrobial effects of Ple enantiomers are attributed to the distinct lipid compositions of prokaryotic (bacterial) and eukaryotic (fungal) cell membranes.
  • Understanding these interactions can inform the development of targeted antimicrobial therapies.

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