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Grassart, Alexandre; Meas-Yedid, Vannary; Dufour, Alexandre; Olivo-Marin, Jean-Christophe; Dautry-Varsat, Alice; Sauvonnet, Nathalie
Traffic (Copenhagen, Denmark), August 2010, Letnik: 11, Številka: 8Journal Article
Growing evidence indicates that kinases are central to the regulation of endocytic pathways. Previously, we identified p21-activated kinase 1 (Pak1) as the first specific regulator of clathrin- and caveolae-independent endocytosis used by the interleukin 2 receptor subunit (IL-2R). Here, we address the mechanism by which Pak1 regulates IL-2Rβ endocytosis. First, we show that Pak1 phosphorylates an activator of actin polymerization, cortactin, on its serine residues 405 and 418. Consistently, we observe a specific inhibition of IL-2Rβ endocytosis when cells overexpress a cortactin, wherein these serine residues have been mutated. In addition, we show that the actin polymerization enhancer, neuronal Wiskott-Aldrich syndrome protein (N-WASP), is involved in IL-2Rβ endocytosis. Strikingly, we find that Pak1 phosphorylation of cortactin on serine residues 405 and 418 increases its association with N-WASP. Thus, Pak1, by controlling the interaction between cortactin and N-WASP, could regulate the polymerization of actin during clathrin-independent endocytosis.
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