Eur. Phys. J. B 68, 601-605 (2009)
https://doi.org/10.1140/epjb/e2009-00113-8

Kinesin and the Crooks fluctuation theorem

Depto. de Física, F. C. E. y N. - UBA and CONICET, Argentina

Corresponding author: ^a calzetta@df.uba.ar

Received: 24 September 2008
Revised: 3 December 2008
Published online: 25 March 2009

Abstract

The thermal efficiency of the kinesin cycle at stalling is presently a matter of some debate, with published predictions ranging from 0 [Phys. Rev. Lett. 99, 158102 (2007); Phys. Rev. E 78, 011915 (2008)] to 100% [in Molecular Motors, edited by M. Schliwa (Wiley-VCH Verlag GmbH, Weinheim (2003), p. 207]. In this note we attemp to clarify the issues involved. We also find an upper bound on the kinesin efficiency by constructing an ideal kinesin cycle to which the real cycle may be compared. The ideal cycle has a thermal efficiency of less than one, and the real one is less efficient than the ideal one always, in compliance with Carnot's theorem.