Phosphorylation of Tyrosine 291 Enhances the Ability of WASp to Stimulate Actin Polymerization and Filopodium Formation*

Phosphorylation of Tyrosine 291 Enhances the Ability of WASp to Stimulate Actin Polymerization and Filopodium Formation*
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酪氨酸 291 的磷酸化增强了 WASp 刺激肌动蛋白聚合和丝状足形成的能力*

DOI:
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发表时间:
2002
影响因子:
4.8
通讯作者:
A. Ridley
A. Ridley
中科院分区:
生物学2区
文献类型:
--
作者:
Giles O. C. Cory;Ritu Garg;R. Cramer;A. Ridley

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Wiskott-Aldrich综合征蛋白(WASp)是造血细胞中Arp 2/3复合物和肌动蛋白细胞骨架的关键调节剂。WASp能够形成自抑制构象,其可以通过Cdc 42和磷脂酰肌醇4,5-二磷酸的结合而被破坏,导致其活化。血小板上胶原受体的刺激和B细胞受体的交联诱导WASp的酪氨酸磷酸化。在这里,我们表明,Src家族激酶Hck诱导磷酸化的WASp-Tyr 291独立的Cdc 42,这会导致移动的WASp在SDS-PAGE。磷酸模拟突变体,WASp-Y291 E,表现出增强的能力,刺激肌动蛋白聚合在无细胞系统中,当显微注射到原代巨噬细胞诱导广泛的丝状伪足形成比野生型WASp或Y291 F突变体更高的效率。我们认为Tyr 291的磷酸化直接调节WASp的功能。
Wiskott-Aldrich Syndrome protein (WASp) is a key regulator of the Arp2/3 complex and the actin cytoskeleton in hematopoietic cells. WASp is capable of forming an auto-inhibited conformation, which can be disrupted by binding of Cdc42 and phosphatidylinositol 4,5-bisphosphate, leading to its activation. Stimulation of the collagen receptor on platelets and crosslinking the B-cell receptor induce tyrosine phosphorylation of WASp. Here we show that the Src family kinase Hck induces phosphorylation of WASp-Tyr291 independently of Cdc42 and that this causes a shift in the mobility of WASp upon SDS-PAGE. A phospho-mimicking mutant, WASp-Y291E, exhibited an enhanced ability to stimulate actin polymerization in a cell-free system and when microinjected into primary macrophages induced extensive filopodium formation with greater efficiency than wild-type WASp or a Y291F mutant. We propose that phosphorylation of Tyr291directly regulates WASp function.
Fc gamma RI 受体通过 hck 和 MAP 激酶的激活发出信号。
DOI: --
发表时间: 1995
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