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Related Experiment Videos

Reversible surface aggregation in pore formation by pardaxin

D Rapaport1, R Peled, S Nir

  • 1Department of Membrane Research and Biophysics, Weizmann Institute of Science, Hebrew University of Jerusalem, Israel.

Biophysical Journal
|June 1, 1996
PubMed
Summary
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Surface active peptides like pardaxin induce vesicle leakage via reversible aggregation. This aggregation forms pores, explaining dye release from lipid bilayers, a crucial insight into peptide-membrane interactions.

Area of Science:

  • Membrane biophysics
  • Biochemistry
  • Physical chemistry

Background:

  • The mechanism of peptide-induced membrane leakage is not fully understood.
  • Surface-active peptides can disrupt cell membranes, but the precise molecular events are unclear.

Purpose of the Study:

  • To investigate the molecular mechanism of leakage induced by the peptide pardaxin in lipid vesicles.
  • To elucidate the role of peptide aggregation and pore formation in membrane permeabilization.

Main Methods:

  • Monitoring dye release (calcein) from large unilamellar vesicles.
  • Theoretical modeling of peptide-lipid interactions and pore formation.
  • Using fluorescein-labeled pardaxin to study peptide aggregation and exchange.

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Main Results:

  • Leakage occurred via an all-or-none mechanism.
  • A mathematical model incorporating reversible surface aggregation explained experimental results.
  • Pore formation involved aggregation of approximately 6 peptides.
  • Lower temperatures (30°C) showed increased leakage compared to higher temperatures (43°C) due to enhanced reversible aggregation.

Conclusions:

  • Reversible surface aggregation of pardaxin is the primary mechanism for pore formation and subsequent membrane leakage.
  • Peptide aggregation dynamics, not just partitioning, dictate membrane permeabilization.
  • The findings provide a molecular basis for understanding peptide-induced membrane disruption.