Efficiency of molecular motors at maximum power

Details Efficiency of molecular motors at maximum power Efficiency of molecular motors at maximum power

2008-01-24

arxiv.org/abs/0801.3743v2

EPL 83, 30005 (2008)

Physics

Condensed Matter

Statistical Mechanics

published in EPL: http://www.iop.org/EJ/abstract/0295-5075/83/3/30005

Scientific paper

10.1209/0295-5075/83/30005

Molecular motors transduce chemical energy obtained from hydrolizing ATP into mechanical work exerted against an external force. We calculate their efficiency at maximum power output for two simple generic models and show that the qualitative behaviour depends crucially on the position of the transition state. Specifically, we find a transition state near the initial state (sometimes characterized as a "power stroke") to be most favorable with respect to both high power output and high efficiency at maximum power. In this regime, driving the motor further out of equilibrium by applying higher chemical potential differences can even, counter-intuitively, increase the efficiency.

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