Lateral diffusion of a protein on a fluctuating membrane

Details Lateral diffusion of a protein on a fluctuating membrane Lateral diffusion of a protein on a fluctuating membrane

2005-03-23

arxiv.org/abs/cond-mat/0503568v1

Europhys. Lett. 71, 859 (2005)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 4 figures

Scientific paper

10.1209/epl/i2005-10139-6

Measurements of lateral diffusion of proteins in a membrane typically assume that the movement of the protein occurs in a flat plane. Real membranes, however, are subject to thermal fluctuations, leading to movement of an inclusion into the third dimension. We calculate the magnitude of this effect by projecting real three-dimensional diffusion onto an effective one on a flat plane. We consider both a protein that is free to diffuse in the membrane and one that also couples to the local curvature. For a freely diffusing inclusion the measured projected diffusion constant is up to 15% smaller than the actual value. Coupling to the curvature enhances diffusion significantly up to a factor of two.

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