Soft Listeria: actin-based propulsion of liquid drops

Details Soft Listeria: actin-based propulsion of liquid drops Soft Listeria: actin-based propulsion of liquid drops

2003-11-27

arxiv.org/abs/cond-mat/0311620v1

Phys. Rev. E 69, 061906 (2004)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures

Scientific paper

10.1103/PhysRevE.69.061906

We study the motion of oil drops propelled by actin polymerization in cell extracts. Drops deform and acquire a pear-like shape under the action of the elastic stresses exerted by the actin comet. We solve this free boundary problem and calculate the drop shape taking into account the elasticity of the actin gel and the variation of the polymerization velocity with normal stress. The pressure balance on the liquid drop imposes a zero propulsive force if gradients in surface tension or internal pressure are not taken into account. Quantitative parameters of actin polymerization are obtained by fitting theory to experiment.

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