1. Molecular motor efficiency is maximized in the presence of both power-stroke and rectification
- Author
-
Schmitt, R. K., Rodríguez Parrondo, Juan Manuel, Linke, H., Johansson, J., Schmitt, R. K., Rodríguez Parrondo, Juan Manuel, Linke, H., and Johansson, J.
- Abstract
©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)., 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., Unión Europea. FP7, Ministerio de Economía y Competitividad (MINECO), Swedish Research Council, Depto. de Estructura de la Materia, Física Térmica y Electrónica, Fac. de Ciencias Físicas, TRUE, pub
- Published
- 2023