Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 337, Issue 3-4, Pages 531-545Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physa.2003.12.058
Keywords
raft; budding; proteins; membranes; vesicles shape; spherical cap harmonics
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The recent discovery of a lateral organization in cell membranes due to small structures called rafts' has motivated a lot of biological and physico-chemical studies. A new experiment on a model system has shown a spectacular budding process with the expulsion of one or two rafts when one introduces proteins on the membrane. In this paper, we give a physical interpretation of the budding of the raft phase. An approach based on the energy of the system including the presence of proteins is used to derive a shape equation and to study possible instabilities. This model shows two different situations which are strongly dependent on the nature of the proteins: a regime of easy budding when the proteins are strongly coupled to the membrane and a regime of difficult budding. (C) 2004 Elsevier B.V. All rights reserved.
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