Adhesion promotes phase separation in mixed-lipid membranes
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We investigate the interplay of domain formation and adhesion in mixed-lipid membranes. Giant unilamellar vesicles consisting of two- and three-component lipid mixtures are studied using confocal fluorescence microscopy. Upon driving the system towards the demixing transition, phase separation is invariably found to occur first in regions where membranes adhere to one another, despite identical lipid headgroups and negligible curvature effects. We propose a simple generic mechanism based on the suppression of thermal shape fluctuations to explain these observations. Our findings suggest novel possibilities by which biomembranes can create and utilize lateral lipid heterogeneities.
V.D. Gordon (currently with UT Austin), C.M.J. Andrew, S.U. Egelhaaf, and W.C. K. Poon are with SUPA, School of Physics, and COSMIC, The University of Edinburgh – M. Desserno is with the Max-Planck-Institut f¨ur Polymerforschung and the Department of Physics, Carnegie Mellon University – S.U. Egelhaaf is with the Condensed Matter Physics Laboratory, Heinrich-Heine-University