Electrostatic field effects on membrane domain segregation and on lateral diffusion

Biophysics Reviews
Natalia Wilke, Bruno Maggio

Abstract

Natural membranes are organized structures of neutral and charged molecules bearing dipole moments which generate local non-homogeneous electric fields. When subjected to such fields, the molecules experience net forces that can modify the lipid and protein organization, thus modulating cell activities and influencing (or even dominating) the biological functions. The energetics of electrostatic interactions in membranes is a long-range effect which can vary over distance within r(-1) to r(-3). In the case of a dipole interacting with a plane of dipoles, e.g. a protein interacting with a lipid domain, the interaction is stronger than two punctual dipoles and depends on the size of the domain. In this article, we review several contributions on how electrostatic interactions in the membrane plane can modulate the phase behavior, surface topography and mechanical properties in monolayers and bilayers.

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Citations

Dec 18, 2012·Critical Care Research and Practice·Samir Gupta, Steven M Donn

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