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Molecular motor efficiency is maximized in the presence of both power-stroke and rectification



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Schmitt, R. K. and Rodríguez Parrondo, Juan Manuel and Linke, H. and Johansson, J. (2015) Molecular motor efficiency is maximized in the presence of both power-stroke and rectification. New Journal of Physics, 17 . ISSN 1367-2630

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Official URL: http://dx.doi.org/10.1088/1367-2630/17/6/065011


We present a model for a feedback-controlled ratchet consisting of a Brownian particle and a moving, finite barrier that is shifted by an external agent depending on the position of the particle. By modifying the value of a single parameter of the feedback protocol, the model can act either as a pure rectifier, a power-stroke (PS) motor, or a combination of both. Interestingly, in certain situations the motor reaches a maximum efficiency for an intermediate value of that parameter, i.e., for a combination of the information ratchet and the PS mechanisms. We relate our results to the biological motors kinesin, myosin II, and myosin V, finding that these motors operate in a regime of length scales and forces where the efficiency is maximized for a combination of rectification and PS mechanisms.

Item Type:Article
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©2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
The research leading to these results has received funding from the European Union Seventh Framework program (FP7/2007-2013) under grant agreement nr 308850 (project acronym INFERNOS) and by the Swedish Research Council. J M R P gratefully acknowledges the Pufendorf Institute at Lund university for its hospitality at the beginning of this project and financial support from the Spanish MINECO Grant ENFASIS (FIS2011-22644).

Uncontrolled Keywords:2nd Law; Maxwells demon; Jarzynski equality; Mutual information; Symmetry-breaking; Equilibrium; Energetics; Principle; Feedback; Entropy.
Subjects:Sciences > Physics > Nuclear physics
ID Code:33364
Deposited On:05 Nov 2015 18:16
Last Modified:10 Dec 2018 14:57

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