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arXiv 1706.08893physics.bio-phcond-mat.stat-mech
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协同反应和聚类:机械敏感通道间膜介导相互作用的结果

Cooperative response and clustering: consequences of membrane-mediated interactions among mechanosensitive channels

Lucas D. Fernandes, Ksenia Guseva, Alessandro P. S. de Moura

摘要:

机械敏感(MS)通道是离子通道,充当细胞的安全阀,当渗透压变得太高时打开,并通过释放离子使细胞避免损伤。它们存在于大量生物体的细胞膜上。它们通过它们在膜中引起的变形而相互作用。我们发现,集体动力学所产生的通道间的相互作用导致第一和第二阶相变在平衡有关的形成通道集群的开放通道的分数。我们发现,这导致在相当大的延迟的细胞对渗透压冲击的反应,并在其响应时间的极端细胞到细胞的随机变化,尽管大量的通道存在于每个细胞。我们讨论了我们的结果是如何相关的{ \it E。coli}。

英文摘要:

Mechanosensitive (MS) channels are ion channels which act as cells' safety valves, opening when the osmotic pressure becomes too high and making cells avoid damage by releasing ions. They are found on the cellular membrane of a large number of organisms. They interact with each other by means of deformations they induce in the membrane. We show that collective dynamics arising from the inter-channel interactions lead to first and second-order phase transitions in the fraction of open channels in equilibrium relating to the formation of channel clusters. We show that this results in a considerable delay of the response of cells to osmotic shocks, and to an extreme cell-to-cell stochastic variations in their response times, despite the large numbers of channels present in each cell. We discuss how our results are relevant for {\it E. coli}.

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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