Membrane Molecule Reorientation in an Electric Field Recorded by Attenuated Total Reflection Fourier-transform Infrared Spectroscopy

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 2001 Feb 13

PMID 11159405

Citations 7

Authors

A Le Saux

J M Ruysschaert

E Goormaghtigh

Affiliations

Soon will be listed here.

Abstract

Electric fields play an important role in the physiological function of macromolecules. Much is known about the role that electric fields play in biological systems, but membrane molecule structure and orientation induced by electric fields remain essentially unknown. In this paper, we present a polarized attenuated total reflection (ATR) experiment we designed to study the effect of electric fields on membrane molecule structure and orientation by Fourier-transform infrared (FTIR) spectroscopy. Two germanium crystals used as the internal reflection element for ATR-FTIR experiments were coated with a thin layer of polystyrene as insulator and used as electrodes to apply an electric field on an oriented stack of membranes made of dioleylphosphatidylcholine (DOPC) and melittin. This experimental set up allowed us for the first time to show fully reversible orientational changes in the lipid headgroups specifically induced by the electric potential difference.

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