Phase-state Dependent Current Fluctuations in Pure Lipid Membranes

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 2009 Jun 3

PMID 19486681

Citations 21

Authors

B Wunderlich

C Leirer

A-L Idzko

U F Keyser

A Wixforth

V M Myles

T Heimburg

M F Schneider

Affiliations

Soon will be listed here.

Abstract

Current fluctuations in pure lipid membranes have been shown to occur under the influence of transmembrane electric fields (electroporation) as well as a result from structural rearrangements of the lipid bilayer during phase transition (soft perforation). We demonstrate that the ion permeability during lipid phase transition exhibits the same qualitative temperature dependence as the macroscopic heat capacity of a D15PC/DOPC vesicle suspension. Microscopic current fluctuations show distinct characteristics for each individual phase state. Although current fluctuations in the fluid phase show spikelike behavior of short timescales (approximately 2 ms) with a narrow amplitude distribution, the current fluctuations during lipid phase transition appear in distinct steps with timescales of approximately 20 ms. We propose a theoretical explanation for the origin of timescales and permeability based on a linear relationship between lipid membrane susceptibilities and relaxation times near the phase transition.

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