title: WAVE2 serves a functional partner of IRSp53 by regulating its interaction with Rac.
abstract: We previously reported that IRSp53 binds both Rac and WAVE2, inducing formation of Rac/IRSp53/WAVE2 complex that is important for membrane ruffling. However, recent reports noted a specific interaction between IRSp53 and Cdc42 but not Rac, which led us to re-examine the binding of IRSp53 to Rac. Immunoprecipitation analysis and pull-down assay reveal that full-length IRSp53 binds Rac much less efficiently than the N-terminal fragment, which may be caused by intramolecular interaction. Interestingly, the intramolecular interaction is interrupted by the binding of WAVE2 and full-length IRSp53 associates with Rac in the presence of WAVE2. We also report that IRSp53 induces spreading and neurite formation of N1E-115 cells, which presumably reflect functional cooperation with Rac.
authors.affiliation: Division of Cancer Genomics, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Miki
authors.forename: Tadaomi
authors.initials: T
authors.lastname: Takenawa
mesh_terms: D000818:Animals; D019556:COS Cells; D002522:Chlorocebus aethiops; D005982:Glutathione Transferase / Q000378:metabolism; D007700:Kinetics; D008840:Microfilament Proteins / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D016501:Neurites / Q000502:physiology; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D014162:Transfection; D020744:rac GTP-Binding Proteins / Q000378:metabolism*; D018909:src Homology Domains
chemical_list: C119539:BAIAP2 protein, human; D008840:Microfilament Proteins; D009419:Nerve Tissue Proteins; D011993:Recombinant Fusion Proteins; D005982:Glutathione Transferase; D020744:rac GTP-Binding Proteins