Structure and control of the actin regulatory WAVE complex

Article

关键词: WASP/SCAR PROTEINS;    TYROSINE KINASE;    CELL-MIGRATION;    WASP FAMILY;    PHOSPHORYLATION;    ACTIVATION;    MEMBRANE;    MODEL;    RAC1;    INTEGRATION;   

DOI  :  10.1038/nature09623

来源: SCIE

【 摘 要 】

Members of the Wiskott-Aldrich syndrome protein (WASP) family control cytoskeletal dynamics by promoting actin filament nucleation with the Arp2/3 complex. The WASP relative WAVE regulates lamellipodia formation within a 400-kilodalton, hetero-pentameric WAVE regulatory complex (WRC). The WRC is inactive towards the Arp2/3 complex, but can be stimulated by the Rac GTPase, kinases and phosphatidylinositols. Here we report the 2.3-angstrom crystal structure of the WRC and complementary mechanistic analyses. The structure shows that the activity-bearing VCA motif of WAVE is sequestered by a combination of intramolecular and intermolecular contacts within the WRC. Rac and kinases appear to destabilize a WRC element that is necessary for VCA sequestration, suggesting the way in which these signals stimulate WRC activity towards the Arp2/3 complex. The spatial proximity of the Rac binding site and the large basic surface of the WRC suggests how the GTPase and phospholipids could cooperatively recruit the complex to membranes.

【 授权许可】

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