The structure of the C-terminal actin-binding domain of talin.

The structure of the C-terminal actin-binding domain of talin.
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塔林的C末端肌动蛋白结合结构域的结构。

DOI:
10.1038/sj.emboj.7601965
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发表时间:
2008-01-23
期刊:
影响因子:
11.4
通讯作者:
Critchley, David R.
Critchley, David R.
中科院分区:
生物学1区
文献类型:
--
作者:
Gingras, Alexandre R.;Bate, Neil;Goult, Benjamin T.;Hazelwood, Larnele;Canestrelli, Ilona;Grossmann, J. Gunter;Liu, HongJun;Putz, Nicholas S. M.;Roberts, Gordon C. K.;Volkmann, Niels;Hanein, Dorit;Barsukov, Igor L.;Critchley, David R.

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塔林蛋白是一种大的二聚体蛋白,它将整合素偶联到细胞骨架肌动蛋白上。在这里,我们报告的C-末端肌动蛋白结合域的塔林,其核心是一个五螺旋束连接到一个负责二聚化的C-末端螺旋的结构。束的NMR结构揭示了被带正电荷的基团包围的保守的表面暴露的疏水补丁。我们已经绘制了肌动蛋白结合位点的表面,并表明,螺旋1的相反侧的束负调控肌动蛋白结合。的二聚螺旋的晶体结构揭示了一个反平行卷曲螺旋与保守的残基聚集在溶剂暴露面。突变表明,二聚化是必不可少的丝状肌动蛋白(F-肌动蛋白)的结合,并表明,二聚化螺旋本身有助于结合。我们已经使用这些结构与小角度X射线散射,以获得整个域的模型。电子显微镜为二聚体与F-肌动蛋白的结合提供了直接证据,并表明它沿着肌动蛋白丝的长螺距螺旋沿着与三个单体结合。
Talin is a large dimeric protein that couples integrins to cytoskeletal actin. Here, we report the structure of the C-terminal actin-binding domain of talin, the core of which is a five-helix bundle linked to a C-terminal helix responsible for dimerisation. The NMR structure of the bundle reveals a conserved surface-exposed hydrophobic patch surrounded by positively charged groups. We have mapped the actin-binding site to this surface and shown that helix 1 on the opposite side of the bundle negatively regulates actin binding. The crystal structure of the dimerisation helix reveals an antiparallel coiled-coil with conserved residues clustered on the solvent-exposed face. Mutagenesis shows that dimerisation is essential for filamentous actin (F-actin) binding and indicates that the dimerisation helix itself contributes to binding. We have used these structures together with small angle X-ray scattering to derive a model of the entire domain. Electron microscopy provides direct evidence for binding of the dimer to F-actin and indicates that it binds to three monomers along the long-pitch helix of the actin filament.
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