Talin in mechanotransduction and mechanomemory at a glance.

Talin in mechanotransduction and mechanomemory at a glance.
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DOI:
10.1242/jcs.258749
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发表时间:
2021-10-15
影响因子:
4
通讯作者:
Schwartz MA
Schwartz MA
中科院分区:
生物学2区
文献类型:
--
作者:
Goult BT;Brown NH;Schwartz MA

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Talins是一种细胞骨架连接蛋白,由一个n端头部结构域、一个柔性颈区和一个由13个螺旋束组成的c端杆状结构域组成。头部结构域结合整合素β-亚基细胞质尾部,触发整合素构象激活,增加对细胞外基质蛋白的亲和力。杆状结构域与细胞内的肌动蛋白丝连接,传递机械负荷,并作为许多其他蛋白质募集的机械敏感信号中枢。α-螺旋束起着力依赖开关的作用——当力诱导展开时,与折叠束相互作用的蛋白质会发生位移,从而暴露出其他配体先前隐藏的结合位点。这就引出了talin代码的概念。在这篇Cell Science at a Glance文章和随附的海报中,我们提出talin杆内的多个开关功能可以处理和存储依赖于时间和力的机械和化学信息。Talin包含13个力相关二进制开关;这篇Cell at a Glance的论文将talin描述为一种记忆分子,其中这些开关赋予分子记忆和信息处理功能。
Talins are cytoskeletal linker proteins that consist of an N-terminal head domain, a flexible neck region and a C-terminal rod domain made of 13 helical bundles. The head domain binds integrin β-subunit cytoplasmic tails, which triggers integrin conformational activation to increase affinity for extracellular matrix proteins. The rod domain links to actin filaments inside the cell to transmit mechanical loads and serves as a mechanosensitive signalling hub for the recruitment of many other proteins. The α-helical bundles function as force-dependent switches – proteins that interact with folded bundles are displaced when force induces unfolding, exposing previously cryptic binding sites for other ligands. This leads to the notion of a talin code. In this Cell Science at a Glance article and the accompanying poster, we propose that the multiple switches within the talin rod function to process and store time- and force-dependent mechanical and chemical information. Summary: Talin contains 13 force-dependent binary switches; this Cell at a Glance paper describes talin as a memory molecule where these switches confer molecular memory and information-processing functions.
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