Mechanism of multi-site phosphorylation from a ROCK-I:RhoE complex structure.

Mechanism of multi-site phosphorylation from a ROCK-I:RhoE complex structure.
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ROCK-I:RhoE 复合物结构的多位点磷酸化机制。

DOI:
10.1038/emboj.2008.226
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发表时间:
2008-12-03
期刊:
影响因子:
11.4
通讯作者:
Barford, David
Barford, David
中科院分区:
生物学1区
文献类型:
--
作者:
Komander, David;Garg, Ritu;Wan, Paul T. C.;Ridley, Anne J.;Barford, David

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ROCK-I丝氨酸/苏氨酸蛋白激酶介导RhoA促进肌动蛋白应力纤维和基于整合素的粘着斑形成的作用。ROCK-I在多个N-和C-末端位点磷酸化非常规G-蛋白RhoE。这些磷酸化事件稳定RhoE,其功能是拮抗RhoA诱导的应力纤维组装。在这里,我们提供了一个多位点的磷酸化的RhoE从晶体结构的RhoE与ROCK-I激酶结构域的复杂的分子解释。RhoE通过一个远离其效应区的新结合位点与ROCK-I的C端半段αG螺旋相互作用,将其N和C末端定位在ROCK-I催化位点附近。ROCK-I:RhoE界面的破坏废除了RhoE磷酸化,但对RhoE分解应力纤维的能力没有影响。相比之下,RhoE效应区的突变减弱了RhoE介导的肌动蛋白细胞骨架的破坏,表明RhoE通过与其效应区结合的蛋白质对ROCK-I发挥其抑制作用。我们建议,ROCK-I磷酸化的RhoE形成的反馈回路的一部分,以调节RhoA信号。
The ROCK-I serine/threonine protein kinase mediates the effects of RhoA to promote the formation of actin stress fibres and integrin-based focal adhesions. ROCK-I phosphorylates the unconventional G-protein RhoE on multiple N- and C-terminal sites. These phosphorylation events stabilise RhoE, which functions to antagonise RhoA-induced stress fibre assembly. Here, we provide a molecular explanation for multi-site phosphorylation of RhoE from the crystal structure of RhoE in complex with the ROCK-I kinase domain. RhoE interacts with the C-lobe αG helix of ROCK-I by means of a novel binding site remote from its effector region, positioning its N and C termini proximal to the ROCK-I catalytic site. Disruption of the ROCK-I:RhoE interface abolishes RhoE phosphorylation, but has no effect on the ability of RhoE to disassemble stress fibres. In contrast, mutation of the RhoE effector region attenuates RhoE-mediated disruption of the actin cytoskeleton, indicating that RhoE exerts its inhibitory effects on ROCK-I through protein(s) binding to its effector region. We propose that ROCK-I phosphorylation of RhoE forms part of a feedback loop to regulate RhoA signalling.
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影响因子: 2.2
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影响因子: --
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