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arXiv 1209.3667cond-mat.stat-mechcond-mat.softphysics.bio-phq-bio.BM
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分子马达的作用:应用于F1-ATPase的一般混合模型

Efficiencies of a molecular motor: A generic hybrid model applied to the F1-ATPase

Eva Zimmermann, Udo Seifert

摘要:

在单分子检测中,分子马达的运动通常是从测量附着在其上的大探针粒子的随机轨迹推断的。组合动力学由电机的离散步和探针的连续布朗运动组成。最近的实验F1-ATP酶的动机,我们调查三种类型的效率都在模拟和高斯近似。总体而言,我们得到了良好的定量协议与实验数据。特别是,我们澄清的条件下,这些效率之一变得大于一。

英文摘要:

In a single molecule assay, the motion of a molecular motor is often inferred from measuring the stochastic trajectory of a large probe particle attached to it. We discuss a simple model for this generic set-up taking into account explicitly the elastic coupling between probe and motor. The combined dynamics consists of discrete steps of the motor and continuous Brownian motion of the probe. Motivated by recent experiments on the F1-ATPase, we investigate three types of efficiencies both in simulations and a Gaussian approximation. Overall, we obtain good quantitative agreement with the experimental data. In particular, we clarify the conditions under which one of these efficiencies becomes larger than one.

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