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    J Biol Chem. 1998 Oct 9;273(41):26516-21.

    Interaction of Hic-5, A senescence-related protein, with focal adhesion kinase.

    Fujita H, Kamiguchi K, Cho D, Shibanuma M, Morimoto C, Tachibana K.

    Department of Cancer Immunology & AIDS, Dana-Faber Cancer Institute, Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115, USA.

    Hydrogen peroxide-inducible clone (Hic)-5 is induced during the senescent process in human fibroblasts, and the overexpression of Hic-5 induces a senescence-like phenotype. Structurally, Hic-5 and paxillin, a 68-kDa cytoskeletal protein, share homology such as the LD motifs in the N-terminal half and the LIM domains in the C-terminal half. Here we show that Hic-5 binds to focal adhesion kinase (FAK) by its N-terminal domain, and is localized to focal adhesions by its C-terminal LIM domains. However, Hic-5 is not tyrosine phosphorylated either by the coexpressed FAK in COS cells or by integrin stimulation in 293T cells. Furthermore, overexpression of Hic-5 results in a decreased tyrosine phosphorylation of paxillin. These findings suggest that putative functions of Hic-5 are the recruitment of FAK to focal adhesions and a competitive inhibition of tyrosine phosphorylation of paxillin.

    PMID: 9756887 [PubMed - indexed for MEDLINE]

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