Monomer dynamics of a wormlike chain
Institut für Theoretische Physik, Universität Leipzig - PF 100920, 04009 Leipzig, Germany, EU
Accepted: 2 October 2011
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.
PACS: 87.15.H- – Dynamics of biomolecules / 87.80.Nj – Single-molecule techniques
© EPLA, 2011