Structural mechanism of integrin inactivation by filamin.

Structural mechanism of integrin inactivation by filamin.
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DOI:
10.1038/nsmb.2999
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发表时间:
2015-05
影响因子:
16.8
通讯作者:
Qin, Jun
Qin, Jun
中科院分区:
生物学1区
文献类型:
--
作者:
Liu, Jianmin;Das, Mitali;Yang, Jun;Ithychanda, Sujay Subbayya;Yakubenko, Valentin P.;Plow, Edward F.;Qin, Jun

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异源二聚体(α/β)整合素的活化对于调节细胞粘附至关重要。塔林蛋白与整合素的细胞质表面结合激活受体,但整合素如何适当地维持在静息状态以抵消其调节粘附动力学的激活仍然不清楚。我们报道了人整合素αIIbβ3与其抑制剂细丝蛋白A的免疫球蛋白重复序列21(FLNa-Ig 21)结合的胞浆区结构。该结构揭示了一种意想不到的三元复合物,其中FLNa-Ig 21不仅与先前预测的整合素β3胞质尾(CT)的C末端结合,而且还与αIIb和β3 CT的N末端螺旋结合,以稳定CT间的卡环,这有助于抑制静息状态下的整合素。结合功能数据,该结构揭示了细丝蛋白介导的非活性整合素保留的新机制,为理解整合素活化和粘附的调节提供了新的框架。
The activation of heterodimeric (α/β) integrin is crucial for regulating cell adhesion. Binding of talin to the cytoplasmic face of integrin activates the receptor, but how integrin is properly maintained in resting state to counterbalance its activation for regulating adhesion dynamics remains obscure. We report the structure of cytoplasmic domain of human integrin αIIbβ3 bound to its inhibitor, the immunoglobin repeat 21 of filamin A (FLNa-Ig21). The structure reveals an unexpected ternary complex where FLNa-Ig21 not only binds to previously predicted C-terminus of integrin β3 cytoplasmic tail (CT) but also engages N-terminal helices of αIIb and β3 CTs to stabilize an inter-CT clasp that helps restrain the integrin in a resting state. Combined with functional data, the structure reveals a novel mechanism of filamin-mediated retention of inactive integrin, suggesting a new framework for understanding regulation of integrin activation and adhesion.
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发表时间: 2012-11-01
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