Author: Bullerjahn J. T. Sturm S. Wolff L. Kroy K.
Publisher: Edp Sciences
E-ISSN: 1286-4854|96|4|48005-48005
ISSN: 0295-5075
Source: EPL (EUROPHYSICS LETTERS), Vol.96, Iss.4, 2011-11, pp. : 48005-48005
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Abstract
We derive the stochastic equations of motion for a tracer that is tightly attached to a semiflexible polymer and confined or agitated by an externally controlled potential. The generalised Langevin equation, the power spectrum, and the mean-square displacement for the tracer dynamics are explicitly constructed from the microscopic equations of motion for a weakly bending wormlike chain by a systematic coarse-graining procedure. Our accurate analytical expressions should provide a convenient starting point for further theoretical developments and for the analysis of various single-molecule experiments and of protein shape fluctuations.
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