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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2011

Dynamical membrane curvature instability controlled by intermonolayer friction

Anne-Florence Bitbol
Jean-Baptiste Fournier
Miglena Angelova
Nicolas Puff

Résumé

We study a dynamical curvature instability caused by a local chemical modification of a phospholipid membrane. In our experiments, a basic solution is microinjected close to a giant unilamellar vesicle, which induces a local chemical modification of some lipids in the external monolayer of the membrane. This modification causes a local deformation of the vesicle, which then relaxes. We present a theoretical description of this instability, taking into account both the change of the equilibrium lipid density and the change of the spontaneous membrane curvature induced by the chemical modification. We show that these two types of changes of the membrane properties yield different dynamics. In contrast, it is impossible to distinguish them when studying the equilibrium shape of a vesicle subjected to a global modification. In our model, the longest relaxation timescale is related to the intermonolayer friction, which plays an important part when there is a change in the equilibrium density in one monolayer. We compare our experimental results to the predictions of our model by fitting the measured time evolution of the deformation height to the solution of our dynamical equations. We obtain good agreement between theory and experiments. Our fits enable us to estimate the intermonolayer friction coefficient, yielding values that are consistent with previous measurements.
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Dates et versions

hal-00604694 , version 1 (29-06-2011)

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Anne-Florence Bitbol, Jean-Baptiste Fournier, Miglena Angelova, Nicolas Puff. Dynamical membrane curvature instability controlled by intermonolayer friction. Journal of Physics: Condensed Matter, 2011, 23 (28), pp.284102. ⟨10.1088/0953-8984/23/28/284102⟩. ⟨hal-00604694⟩
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