Recreation of the terminal events in physiological integrin activation.

Recreation of the terminal events in physiological integrin activation.
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DOI:
10.1083/jcb.200908045
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发表时间:
2010-01-11
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Ginsberg MH
Ginsberg MH
中科院分区:
其他
文献类型:
--
作者:
Ye F;Hu G;Taylor D;Ratnikov B;Bobkov AA;McLean MA;Sligar SG;Taylor KA;Ginsberg MH

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体外分析证实了塔林结合足以激活和延伸膜包埋的整合素。整合素对细胞外基质的亲和力增加(活化)调节细胞粘附和迁移、细胞外基质组装和机械转导。主要的不确定性涉及的塔林激活的充分性,是否构象变化而不聚类导致激活,以及是否需要机械力的分子延伸。在这里,我们在体外重建了整合素的生理激活,并使用细胞、生物化学、生物物理和超微结构分析来表明talin结合足以激活整合素αIIbβ3。此外,我们合成了nanodisks,每个轴承一个单一的脂质嵌入整合素,并使用它们来表明,塔林激活未聚集的整合素,导致分子延伸的情况下的力量或其他膜蛋白。因此,我们提供了第一个证据,证明talin结合足以激活和延长膜包埋的整合素αIIbβ3,从而解决了许多争议,并使分子分析重建的整合素信号转导。
In vitro analysis confirms talin binding is sufficient for activation and extension of membrane-embedded integrin. Increased affinity of integrins for the extracellular matrix (activation) regulates cell adhesion and migration, extracellular matrix assembly, and mechanotransduction. Major uncertainties concern the sufficiency of talin for activation, whether conformational change without clustering leads to activation, and whether mechanical force is required for molecular extension. Here, we reconstructed physiological integrin activation in vitro and used cellular, biochemical, biophysical, and ultrastructural analyses to show that talin binding is sufficient to activate integrin αIIbβ3. Furthermore, we synthesized nanodiscs, each bearing a single lipid-embedded integrin, and used them to show that talin activates unclustered integrins leading to molecular extension in the absence of force or other membrane proteins. Thus, we provide the first proof that talin binding is sufficient to activate and extend membrane-embedded integrin αIIbβ3, thereby resolving numerous controversies and enabling molecular analysis of reconstructed integrin signaling.
整合素{alpha} v {beta} 3的三维EM结构与纤连蛋白的复合物中。
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