Structural Calorimetry of Main Transition of Supported DMPC Bilayers by Temperature-controlled AFM

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 2004 Sep 30

PMID 15454447

Citations 11

Authors

O Enders

A Ngezahayo

M Wiechmann

F Leisten

H-A Kolb

Affiliations

Soon will be listed here.

Abstract

Atomic force microscopy at high temperature resolution (DeltaT < or approximately 0.1 K) provided a quantitative structural calorimetry of the transition from the fluid (Lalpha)- to the gel (Pbeta')-phase of supported dimyristoylphosphatidylcholine bilayers. Besides a determination of the main transition temperature (T0) and the van't Hoff transition enthalpy (DeltaHvH), the structural analysis in the nm-scale at T close to T0 of the ripple phase allowed an experimental estimation of the area of cooperative units from small lipid domains. Thereby, the corresponding transition enthalpy (DeltaH) of single molecules could be determined. The lipid organization and the corresponding parameters T0 and DeltaHvH (DeltaH) were modulated by heptanol or external Ca2+ and compared with physiological findings. The size of the cooperative unit was not significantly affected by the presence of 1 mM heptanol. The observed linear relationship of DeltaHvH and T0 was discussed in terms of a change in heat capacity.

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