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arXiv 1105.4475physics.bio-phq-bio.SC
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活性细胞骨架网络的集体动力学

Collective dynamics of active cytoskeletal networks

Simone Köhler, Volker Schaller, Andreas R. Bausch

摘要:

自组织机制对于细胞骨架适应活细胞的要求是必不可少的。它们依赖于细胞骨架丝、交联蛋白和分子马达之间复杂的相互作用。在这里,我们提出了一个体外极小模型系统,由肌动蛋白丝,肌成束蛋白和肌球蛋白-II丝表现出脉动集体长程动力学。在高动态稳定状态的活性凝胶的重组的特征在于交替周期的运行和失速导致网络的成分的超扩散动力学。它们由网络中交联分子和运动丝的复杂竞争主导:只有当肌球蛋白II丝与肌动蛋白网络结合的相对强度允许施加足够高的力来解开肌动蛋白/肌束蛋白交联时,才能观察到集体动力学。结构形成和动力学之间的反馈可以通过将这些实验与基于简单相互作用规则的唯象模拟相结合来解决。

英文摘要:

Self organization mechanisms are essential for the cytoskeleton to adapt to the requirements of living cells. They rely on the intricate interplay of cytoskeletal filaments, crosslinking proteins and molecular motors. Here we present an in vitro minimal model system consisting of actin filaments, fascin and myosin-II filaments exhibiting pulsative collective long range dynamics. The reorganizations in the highly dynamic steady state of the active gel are characterized by alternating periods of runs and stalls resulting in a superdiffusive dynamics of the network's constituents. They are dominated by the complex competition of crosslinking molecules and motor filaments in the network: Collective dynamics are only observed if the relative strength of the binding of myosin-II filaments to the actin network allows exerting high enough forces to unbind actin/fascin crosslinks. The feedback between structure formation and dynamics can be resolved by combining these experiments with phenomenological simulations based on simple interaction rules.

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