Volume 70, Number 1, April 2005
|Page(s)||49 - 55|
|Published online||09 March 2005|
Phenomenological energetics for molecular motors
Department of Physics, Graduate School of Science, Kyoto University Kyoto 606-8502, Japan
Accepted: 31 January 2005
A phenomenologically closed framework is presented to evaluate the energy balance on a molecular motor at a nonequilibrium steady state. We employed a generalized Langevin equation as a coarse-grained model of a motor, based on which the efficiency of the motor can be calculated from macroscopic observables alone. It is shown that the energy fluxes at a nonequilibrium steady state are related to the extent of the violation of fluctuation-dissipation relation for the velocity fluctuation. We show that the present framework adequately explains the recent experimental result for kinesin.
PACS: 05.40.Jc – Brownian motion / 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 87.16.Nn – Motor proteins (myosin, kinesin dynein)
© EDP Sciences, 2005
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