Mechanical Allostery: Evidence for a Force Requirement in the Proteolytic Activation of Notch.

Mechanical Allostery: Evidence for a Force Requirement in the Proteolytic Activation of Notch.
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机械变构:Notch蛋白水解激活中力需求的证据。

DOI:
10.1016/j.devcel.2015.05.004
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发表时间:
2015-06-22
期刊:
影响因子:
11.8
通讯作者:
Blacklow, Stephen C.
Blacklow, Stephen C.
中科院分区:
生物学1区
文献类型:
--
作者:
Gordon, Wendy R.;Zimmerman, Brandon;He, Li;Miles, Laura J.;Huang, Jiuhong;Tiyanont, Kittichoat;McArthur, Debbie G.;Aster, Jon C.;Perrimon, Norbert;Loparo, Joseph J.;Blacklow, Stephen C.

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配体通过诱导受调节的膜内蛋白水解(RIP)来刺激Notch受体以产生转录效应物。Notch激活需要揭露远离配体结合位点的金属蛋白酶切割位点,这就提出了如何实现蛋白水解敏感性的问题。在这里,我们表明,应用生理相关的力的调节开关的结果在金属蛋白酶裂解的敏感性,并结合配体诱导Notch信号转导细胞中只在存在施加的机械力。去除天然配体-受体相互作用的合成受体-配体系统也通过诱导调节开关的蛋白水解来激活Notch。总之,这些研究表明,信号发送细胞施加的机械力是配体诱导的Notch激活所必需的,并建立了力诱导的蛋白水解可以作为细胞机械转导的机制。
Ligands stimulate Notch receptors by inducing regulated intramembrane proteolysis (RIP) to produce a transcriptional effector. Notch activation requires unmasking of a metalloprotease cleavage site remote from the site of ligand binding, raising the question of how proteolytic sensitivity is achieved. Here, we show that application of physiologically relevant forces to the regulatory switch results in sensitivity to metalloprotease cleavage, and that bound ligands induce Notch signal transduction in cells only in the presence of applied mechanical force. Synthetic receptor-ligand systems that remove the native ligand-receptor interaction also activate Notch by inducing proteolysis of the regulatory switch. Together, these studies show that mechanical force exerted by signal-sending cells is required for ligand-induced Notch activation, and establish that force-induced proteolysis can act as a mechanism of cellular mechanotransduction.
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