arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0802.1493cond-mat.stat-mechq-bio.CBq-bio.QM
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生物细胞中增强的反应动力学

Enhanced reaction kinetics in biological cells

C. Loverdo, O. Benichou, M. Moreau, R. Voituriez

摘要:

细胞骨架是由ATP水解驱动的“活性”介质失衡的突出例子。这种活动最近已被证明有一个惊人的影响,对细胞介质的机械和流变学性质,以及其运输性能:一个通用的示踪剂颗粒自由扩散,在一个标准的平衡介质,但也间歇性地结合随机相互作用时间的马达蛋白,它执行积极的弹道漂移沿细胞骨架丝。在这里,我们首次提出了一个分析模型的运输限制反应在活性介质中,并定量显示如何主动运输可以提高反应性足够大的示踪剂,如囊泡。我们推导出解析的平均相互作用时间与马达蛋白优化的反应速率,并揭示了显着的最佳配置的通用功能。我们讨论了为什么主动运输可能是有益的,在各种生物学的例子:细胞骨架,膜和板状伪足,和管状结构,如轴突。

英文摘要:

The cell cytoskeleton is a striking example of "active" medium driven out-of-equilibrium by ATP hydrolysis. Such activity has been shown recently to have a spectacular impact on the mechanical and rheological properties of the cellular medium, as well as on its transport properties : a generic tracer particle freely diffuses as in a standard equilibrium medium, but also intermittently binds with random interaction times to motor proteins, which perform active ballistic excursions along cytoskeletal filaments. Here, we propose for the first time an analytical model of transport limited reactions in active media, and show quantitatively how active transport can enhance reactivity for large enough tracers like vesicles. We derive analytically the average interaction time with motor proteins which optimizes the reaction rate, and reveal remarkable universal features of the optimal configuration. We discuss why active transport may be beneficial in various biological examples: cell cytoskeleton, membranes and lamellipodia, and tubular structures like axons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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