Monomer dynamics of a wormlike chain

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

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

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.