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Biphasic vesicle: instability induced by adsorption of proteins

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  • Allain, Jean-Marc
  • Ben Amar, Martine

Abstract

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.

Suggested Citation

  • Allain, Jean-Marc & Ben Amar, Martine, 2004. "Biphasic vesicle: instability induced by adsorption of proteins," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 337(3), pages 531-545.
    • Handle: RePEc:eee:phsmap:v:337:y:2004:i:3:p:531-545
    DOI: 10.1016/j.physa.2003.12.058
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