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Morais-de-Sá, Eurico; Mirouse, Vincent; St Johnston, Daniel
Cell, 04/2010, Letnik: 141, Številka: 3Journal Article
Bazooka (PAR-3), PAR-6, and aPKC form a complex that plays a key role in the polarization of many cell types. In epithelial cells, however, Bazooka localizes below PAR-6 and aPKC at the apical/lateral junction. Here, we show that Baz is excluded from the apical aPKC domain in epithelia by aPKC phosphorylation, which disrupts the Baz/aPKC interaction. Removal of Baz from the complex is epithelial-specific because it also requires the Crumbs complex, which prevents the Baz/PAR-6 interaction. In the absence of Crumbs or aPKC phosphorylation of Baz, mislocalized Baz recruits adherens junction components apically, leading to a loss of the apical domain and an expansion of lateral. Thus, apical exclusion of Baz by Crumbs and aPKC defines the apical/lateral border. Although Baz acts as an aPKC targeting and specificity factor in nonepithelial cells, our results reveal that it performs a complementary function in positioning the adherens junction in epithelia. Display omitted ► aPKC phosphorylates Bazooka to prevent its binding to aPKC ► Crumbs outcompetes phospho-Baz for binding to PAR-6 in epithelial cells ► This mechanism defines the apicial/lateral boundary in epithelia ► Failure to exclude Baz from the aPKC complex disrupts epithelial morphogenesis
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