T-cadherin structures reveal a novel adhesive binding mechanism.

T-cadherin structures reveal a novel adhesive binding mechanism.
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DOI:
10.1038/nsmb.1781
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发表时间:
2010-03
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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脊椎动物基因组编码十九种“经典”钙粘蛋白和大约一百种非经典钙粘蛋白。经典钙粘蛋白的粘附取决于其氨基末端 EC1 结构域的结合相互作用,该结构域在相邻细胞的伙伴分子之间交换 N 末端 β 链。然而,非经典钙粘蛋白不存在链交换序列特征,这就提出了这些蛋白质如何在粘附中发挥作用的问题。在这里,我们展示了 T-钙粘蛋白(一种 GPI 锚定的钙粘蛋白)通过 EC1-EC2 钙结合位点附近的替代非交换界面形成二聚体。该界面内的突变会削弱 T-钙粘蛋白的粘附能力。这些非粘附性 T-钙粘蛋白突变体也失去了调节表达 T-钙粘蛋白的神经元的神经突生长的能力。我们的研究结果揭示了 T-钙粘蛋白同质界面可能的分子结构,并揭示了其对轴突生长调节的要求。 T-钙粘蛋白采用的粘附结合模式也可以用于其他非经典钙粘蛋白。
Vertebrate genomes encode nineteen “classical” cadherins and about a hundred non-classical cadherins. Adhesion by classical cadherins depends on binding interactions in their amino terminal EC1 domains, which swap N-terminal β-strands between partner molecules from apposing cells. However, strand swapping sequence signatures are absent from non-classical cadherins, raising the question of how these proteins function in adhesion. Here we show that T-cadherin, a GPI-anchored cadherin, forms dimers through an alternative non-swapped interface near the EC1-EC2 calcium binding sites. Mutations within this interface ablate the adhesive capacity of T-cadherin. These non-adhesive T-cadherin mutants also lose the ability to regulate neurite outgrowth from T-cadherin expressing neurons. Our findings reveal the likely molecular architecture of the T-cadherin homophilic interface, and reveal its requirement for axon outgrowth regulation. The adhesive binding mode employed by T-cadherin may also be used by other non-classical cadherins.
DOI: 10.1016/j.cell.2005.09.021
发表时间: 2005-12-02
期刊: CELL
影响因子: 64.5
作者:
Drees, F;Pokutta, S;Weis, WI
通讯作者: Weis, WI
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发表时间: 2005-09-15
影响因子: 4
作者:
Harrison, OJ;Corps, EM;Kilshaw, PJ
通讯作者: Kilshaw, PJ