title: WIP, a protein associated with wiskott-aldrich syndrome protein, induces actin polymerization and redistribution in lymphoid cells.
abstract: 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.
authors.affiliation: Division of Immunology, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: N
authors.initials: N
authors.lastname: Ramesh
authors.forename: I M
authors.initials: IM
authors.lastname: Antón
authors.forename: J H
authors.initials: JH
authors.lastname: Hartwig
authors.forename: R S
authors.initials: RS
authors.lastname: Geha
mesh_terms: D000199:Actins / Q000378:metabolism*; D000595:Amino Acid Sequence; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D002478:Cells, Cultured; D003598:Cytoskeletal Proteins; D019281:Dimerization; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008214:Lymphocytes / Q000378:metabolism* / Q000648:ultrastructure; D008969:Molecular Sequence Data; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D014923:Wiskott-Aldrich Syndrome / Q000235:genetics* / Q000378:metabolism; D051316:Wiskott-Aldrich Syndrome Protein
chemical_list: D000199:Actins; D002352:Carrier Proteins; D003598:Cytoskeletal Proteins; D047908:Intracellular Signaling Peptides and Proteins; D011506:Proteins; C495767:WAS protein, human; C109903:WIPF1 protein, human; D051316:Wiskott-Aldrich Syndrome Protein