Structure of a double ubiquitin-like domain in the talin head: a role in integrin activation.

Structure of a double ubiquitin-like domain in the talin head: a role in integrin activation.
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DOI:
10.1038/emboj.2010.4
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发表时间:
2010-03-17
期刊:
影响因子:
11.4
通讯作者:
Barsukov, Igor L.
Barsukov, Igor L.
中科院分区:
生物学1区
文献类型:
--
作者:
Goult, Benjamin T.;Bouaouina, Mohamed;Elliott, Paul R.;Bate, Neil;Patel, Bipin;Gingras, Alexandre R.;Grossmann, J. Guenter;Roberts, Gordon C. K.;Calderwood, David A.;Critchley, David R.;Barsukov, Igor L.

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Talin是一种270-kDa的蛋白质,其激活整合素并将其偶联至细胞骨架肌动蛋白。Talin含有由F1、F2和F3结构域组成的N-末端FERM结构域,但它是非典型的,因为F1含有大的插入物,并且在其之前是额外的结构域F0。虽然F3含有β-整联蛋白尾部的结合位点,但F0和F1也是β1-整联蛋白活化所必需的。在这里,我们报告的解决方案结构的F0,F1和F0 F1双域。F0和F1都具有泛素样折叠,通过广泛的带电界面以新颖的固定方向连接。F1插入片段形成具有螺旋倾向的环,并且预测存在于螺旋的一个表面上的碱性残基是结合酸性磷脂和塔林介导的β1-整联蛋白活化所需的。这一点以及F2和F3上的碱性残基对于整联蛋白活化也是必不可少的事实表明,塔林FERM结构域和酸性膜磷脂之间需要广泛的相互作用来定位FERM结构域,以便它可以活化整联蛋白。
Talin is a 270-kDa protein that activates integrins and couples them to cytoskeletal actin. Talin contains an N-terminal FERM domain comprised of F1, F2 and F3 domains, but it is atypical in that F1 contains a large insert and is preceded by an extra domain F0. Although F3 contains the binding site for β-integrin tails, F0 and F1 are also required for activation of β1-integrins. Here, we report the solution structures of F0, F1 and of the F0F1 double domain. Both F0 and F1 have ubiquitin-like folds joined in a novel fixed orientation by an extensive charged interface. The F1 insert forms a loop with helical propensity, and basic residues predicted to reside on one surface of the helix are required for binding to acidic phospholipids and for talin-mediated activation of β1-integrins. This and the fact that basic residues on F2 and F3 are also essential for integrin activation suggest that extensive interactions between the talin FERM domain and acidic membrane phospholipids are required to orientate the FERM domain such that it can activate integrins.
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期刊: NATURE
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塔林的C末端肌动蛋白结合结构域的结构。
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发表时间: 2008-01-23
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
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