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    Proc Natl Acad Sci U S A. 1997 Dec 23;94(26):14671-6.

    WIP, a protein associated with wiskott-aldrich syndrome protein, induces actin polymerization and redistribution in lymphoid cells.

    Ramesh N, Antón IM, Hartwig JH, Geha RS.

    Division of Immunology, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.

    Wiskott-Aldrich syndrome (WAS) is an X-linked immunodeficiency caused by mutations that affect the WAS protein (WASP) and characterized by cytoskeletal abnormalities in hematopoietic cells. By using the yeast two-hybrid system we have identified a proline-rich WASP-interacting protein (WIP), which coimmunoprecipitated with WASP from lymphocytes. WIP binds to WASP at a site distinct from the Cdc42 binding site and has actin as well as profilin binding motifs. Expression of WIP in human B cells, but not of a WIP truncation mutant that lacks the actin binding motif, increased polymerized actin content and induced the appearance of actin-containing cerebriform projections on the cell surface. These results suggest that WIP plays a role in cortical actin assembly that may be important for lymphocyte function.

    PMID: 9405671 [PubMed - indexed for MEDLINE]

    PMCID: 25088

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