Non-equilibrium microtubule fluctuations in a model cytoskeleton

Details Non-equilibrium microtubule fluctuations in a model cytoskeleton Non-equilibrium microtubule fluctuations in a model cytoskeleton

2007-09-19

arxiv.org/abs/0709.2952v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.100.118104

Biological activity gives rise to non-equilibrium fluctuations in the cytoplasm of cells; however, there are few methods to directly measure these fluctuations. Using a reconstituted actin cytoskeleton, we show that the bending dynamics of embedded microtubules can be used to probe local stress fluctuations. We add myosin motors that drive the network out of equilibrium, resulting in an increased amplitude and modified time-dependence of microtubule bending fluctuations. We show that this behavior results from step-like forces on the order of 10 pN driven by collective motor dynamics.

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