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arXiv : physics/0504058

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Budding and Fission of a multiphase vesicle

Jean-Marc Allain 1, Martine Ben Amar 1

(08/04/2005)

We present a model of bi-phasic vesicle in the limit of large surface tension. In this regime, the vesicle is completely stretched and well described by two spherical caps with a fold which concentrates the membrane stress. The conservation laws and geometric constraints restrict the space of possible shapes to a pair of solutions labeled by a parameter $\tau$ given by {\it line tension/pressure}. For a given $\tau$ value, the two solutions differ by the length of the interface between domains. For a critical value $\tau_c$ , the two vesicle shapes become identical and no solution exists above this critical value. This model sheds new light on two proposed mechanisms (osmotic shocks and molecule absorption) to explain the budding and the fission in recent experiments.

1 :	Laboratoire de Physique Statistique de l'ENS (LPS)
	CNRS : UMR8550 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot – Ecole normale supérieure de Paris - ENS Paris

Domaine

:

Physique/Physique/Biophysique Sciences du Vivant/Biologie cellulaire/Organisation et fonctions cellulaires

Mots Clés : Budding – bifurcation – fission – membrane – raft – vesicle

hal-00004654, version 1

http://hal.archives-ouvertes.fr/hal-00004654

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Contributeur : Jean-Marc Allain <>

Soumis le : Vendredi 8 Avril 2005, 15:44:43

Dernière modification le : Vendredi 8 Avril 2005, 15:55:23