Ion pump activity generates fluctuating electrostatic forces in biomembranes

Details Ion pump activity generates fluctuating electrostatic forces in biomembranes Ion pump activity generates fluctuating electrostatic forces in biomembranes

2011-09-19

arxiv.org/abs/1109.4057v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 2 figures, to appear in EPL

Scientific paper

We study the non-equilibrium dynamics of lipid membranes with proteins that actively pump ions across the membrane. We find that the activity leads to a fluctuating force distribution due to electrostatic interactions arising from variation in dielectric constant across the membrane. By applying a multipole expansion we find effects on both the tension and bending rigidity dominated parts of the membranes fluctuation spectrum. We discuss how our model compares with previous studies of force-multipole models.

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