Phosphoinositide binding and phosphorylation act sequentially in the activation mechanism of ezrin.

Phosphoinositide binding and phosphorylation act sequentially in the activation mechanism of ezrin.
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磷酸肌醇的结合和磷酸化在ezrin的激活机理中依次起作用。

DOI:
10.1083/jcb.200307032
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发表时间:
2004-03-01
影响因子:
7.8
通讯作者:
Arpin, M
Arpin, M
中科院分区:
生物学1区
文献类型:
--
作者:
Fievet, BT;Gautreau, A;Roy, C;Del Maestro, L;Mangeat, P;Louvard, D;Arpin, M

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Ezrin 是一种膜-肌动蛋白细胞骨架连接物,参与上皮细胞形态发生,通过分子内相互作用在细胞质中保持非活性。磷脂酰肌醇 4,5-二磷酸 (PIP2) 结合和苏氨酸 567 (T567) 磷酸化参与揭示膜和肌动蛋白结合位点的激活过程。在这里,我们证明埃兹蛋白通过其 NH2 末端结构域与 PIP2 结合是 T567 磷酸化所必需的,因此是埃兹蛋白体内构象激活所必需的。此外,我们发现模仿 T567 磷酸化的 T567D 突变绕过了 PIP2 结合的需要,从而揭示了膜和肌动蛋白结合位点。然而,PIP2 结合和 T567 磷酸化对于埃兹蛋白的正确顶端定位及其在上皮细胞形态发生中的作用都是必需的。这些结果表明,PIP2 结合和 T567 磷酸化依次作用,使埃兹蛋白发挥其细胞功能。
Ezrin, a membrane–actin cytoskeleton linker, which participates in epithelial cell morphogenesis, is held inactive in the cytoplasm through an intramolecular interaction. Phosphatidylinositol 4,5-bisphosphate (PIP2) binding and the phosphorylation of threonine 567 (T567) are involved in the activation process that unmasks both membrane and actin binding sites. Here, we demonstrate that ezrin binding to PIP2, through its NH2-terminal domain, is required for T567 phosphorylation and thus for the conformational activation of ezrin in vivo. Furthermore, we found that the T567D mutation mimicking T567 phosphorylation bypasses the need for PIP2 binding for unmasking both membrane and actin binding sites. However, PIP2 binding and T567 phosphorylation are both necessary for the correct apical localization of ezrin and for its role in epithelial cell morphogenesis. These results establish that PIP2 binding and T567 phosphorylation act sequentially to allow ezrin to exert its cellular functions.
DOI: 10.1074/jbc.273.52.34663
发表时间: 1998-12-25
影响因子: 4.8
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