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    Nat Cell Biol. 2000 Aug;2(8):531-9.

    The cell-polarity protein Par6 links Par3 and atypical protein kinase C to Cdc42.

    Joberty G, Petersen C, Gao L, Macara IG.

    Source

    Markey Center for Cell Signaling, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908-0577, USA. gmj4h@virginia.edu

    Abstract

    PAR (partitioning-defective) proteins, which were first identified in the nematode Caenorhabditis elegans, are essential for asymmetric cell division and polarized growth, whereas Cdc42 mediates establishment of cell polarity. Here we describe an unexpected link between these two systems. We have identified a family of mammalian Par6 proteins that are similar to the C. elegans PDZ-domain protein PAR-6. Par6 forms a complex with Cdc42-GTP, with a human homologue of the multi-PDZ protein PAR-3 and with the regulatory domains of atypical protein kinase C (PKC) proteins. This assembly is implicated in the formation of normal tight junctions at epithelial cell-cell contacts. Thus, Par6 is a key adaptor that links Cdc42 and atypical PKCs to Par3.

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    PMID:
    10934474
    [PubMed - indexed for MEDLINE]

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