Talin as a mechanosensitive signaling hub.

Talin as a mechanosensitive signaling hub.
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DOI:
10.1083/jcb.201808061
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发表时间:
2018-11-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schwartz MA
Schwartz MA
中科院分区:
其他
文献类型:
--
作者:
Goult BT;Yan J;Schwartz MA

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Goult等提出talin作为一系列机械化学开关,形成一个机械敏感信号枢纽,整合粘附信号。细胞粘附到细胞外基质(ECM),介导的跨膜受体的整联蛋白家族,是非常敏感的生化,结构和机械特征的ECM。Talin是一种细胞质蛋白,由一个球状头部结构域和一系列形成其长杆结构域的α-螺旋束组成。塔林蛋白结合到整合素β亚基的胞质结构域,激活整合素,将它们偶联到肌动蛋白细胞骨架,并调节整合素信号传导。最近的证据表明,构成塔林杆结构域的螺旋束的开关样行为,其中各个结构域在不同的张力水平下打开,对不同的蛋白质相互作用产生积极或消极的影响。这些结果使我们提出,塔林功能作为一个机械敏感的信号枢纽,整合多个细胞外和细胞内的输入,以定义一个主轴的粘附信号。
Goult et al. propose that talin acts as series of mechanochemical switches to form a mechanosensitive signaling hub that integrates adhesion signaling. Cell adhesion to the extracellular matrix (ECM), mediated by transmembrane receptors of the integrin family, is exquisitely sensitive to biochemical, structural, and mechanical features of the ECM. Talin is a cytoplasmic protein consisting of a globular head domain and a series of α-helical bundles that form its long rod domain. Talin binds to the cytoplasmic domain of integrin β-subunits, activates integrins, couples them to the actin cytoskeleton, and regulates integrin signaling. Recent evidence suggests switch-like behavior of the helix bundles that make up the talin rod domains, where individual domains open at different tension levels, exerting positive or negative effects on different protein interactions. These results lead us to propose that talin functions as a mechanosensitive signaling hub that integrates multiple extracellular and intracellular inputs to define a major axis of adhesion signaling.
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