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    Biochem Biophys Res Commun. 2005 Dec 16;338(2):808-14. Epub 2005 Oct 18.

    CIN85 regulates the ability of MEKK4 to activate the p38 MAP kinase pathway.

    Aissouni Y, Zapart G, Iovanna JL, Dikic I, Soubeyran P.

    Source

    INSERM, U.624, 13288 Marseille, France.

    Abstract

    CIN85 is a multi-adaptor protein involved in different cellular functions including the down-regulation of activated receptor tyrosine kinases and survival of neuronal cells. CIN85 contains three SH3 domains that specifically bind a unique proline-arginine motif (PxxxPR) found in several CIN85 effectors. In this report, we show that the MAP kinase kinase kinase MEKK4 is a new CIN85-interacting partner. This interaction is mediated by the engagement of the SH3 domains of CIN85 to three PxxxPR motifs located within MEKK4 sequence. By disrupting this interaction we demonstrated that CIN85 binding to MEKK4 enhances the activation of MKK6 and of the downstream p38 MAP kinase following oxidative stress and growth factor stimulation. CIN85 was also shown to regulate the activation of MEKK4 by GADD45 proteins and promote multi-ubiquitination of MEKK4. Taken together, these results indicate a novel role for CIN85 in the regulation of cellular stress response via the MAPK pathways.

    PMID:
    16256071
    [PubMed - indexed for MEDLINE]

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