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Title: DaPKC-dependent phosphorylation of Crumbs is required for epithelial cell polarity in Drosophila

Journal Article · · Journal of Cell Biology
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  1. Consejo Superior de Investigaciones Científicas, Madrid (Spain). Centro de Biología Molecular Severo Ochoa; Universidad Autonóma de Madrid, Cantoblanco, Madrid (Spain)

Both in Drosophila and vertebrate epithelial cells, the establishment of apicobasal polarity requires the apically localized, membrane-associated Par-3–Par-6–aPKC protein complex. In Drosophila, this complex colocalizes with the Crumbs–Stardust (Sdt)–Pals1-associated TJ protein (Patj) complex. Genetic and molecular analyses suggest a functional relationship between them. In this work we show, by overexpression of a kinase-dead Drosophila atypical PKC (DaPKC), the requirement for the kinase activity of DaPKC to maintain the position of apical determinants and to restrict the localization of basolateral ones. We demonstrate a novel physical interaction between the apical complexes, via direct binding of DaPKC to both Crb and Patj, and identify Crumbs as a phosphorylation target of DaPKC. This phosphorylation of Crumbs is functionally significant. Thus, a nonphosphorylatable Crumbs protein behaves in vivo as a dominant negative. Moreover, the phenotypic effect of overexpressing wild-type Crumbs is suppressed by reducing DaPKC activity. These results provide a mechanistic framework for the functional interaction between the Par-3–Par-6–aPKC and Crumbs–Sdt–Patj complexes based in the posttranslational modification of Crb by DaPKC.

Research Organization:
Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain); Universidad Autonóma de Madrid, Cantoblanco, Madrid (Spain)
Sponsoring Organization:
Comunidad Autónoma de Madrid (CAM); Dirección General de Investigación Científica y Técnica; Fundación Ramón Areces
Grant/Contract Number:
08.5/0030/2000; PB98-0682; BMC2002-00411; SAF1999-0053; 2FD97-1429; SAF2000-0175; 08.1/0060/2000
OSTI ID:
1625133
Journal Information:
Journal of Cell Biology, Vol. 166, Issue 4; ISSN 0021-9525
Publisher:
Rockefeller University PressCopyright Statement
Country of Publication:
United States
Language:
English

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