title: Interaction of a multi-domain adaptor protein, vinexin, with a Rho-effector, Rhotekin.
abstract: Among various effector proteins for the Rho small GTPase, the function(s) of Rhotekin is almost unknown. We have identified a multi-domain adaptor protein, vinexin, as a binding partner for Rhotekin, using yeast two-hybrid screening of a human heart library. Rhotekin was found to associate with vinexin in vitro, in COS7 cells, and in brain tissues. The C-terminal Pro-rich motif of Rhotekin exhibited binding to the third SH3 domain of vinexin. The binding was little affected by Rho but was inhibited by activated Cdc42 in COS7 cells. Immunofluorescence analyses revealed partial colocalization of vinexin-alpha with Rhotekin at focal adhesions in REF52 fibroblast cells. These results suggest that Rhotekin forms a complex with vinexin and may play a role at focal adhesions.
authors.affiliation: Department of Molecular Neurobiology, Institute for Developmental Research, Aichi Human Service Center, 713-8 Kamiya, Kasugai, Aichi, 480-0392, Japan. knagata@inst-hsc.jp
authors.forename: Koh-Ichi
authors.initials: K
authors.lastname: Nagata
authors.forename: Hidenori
authors.initials: H
authors.lastname: Ito
authors.forename: Ikuko
authors.initials: I
authors.lastname: Iwamoto
authors.forename: Rika
authors.initials: R
authors.lastname: Morishita
authors.forename: Tomiko
authors.initials: T
authors.lastname: Asano
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D051017:Apoptosis Regulatory Proteins; D001921:Brain / Q000378:metabolism; D019556:COS Cells; D002460:Cell Line; D002522:Chlorocebus aethiops; D022001:Focal Adhesions / Q000378:metabolism; D019204:GTP-Binding Proteins; D006801:Humans; D066298:In Vitro Techniques; D047908:Intracellular Signaling Peptides and Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D046912:Multiprotein Complexes; D009124:Muscle Proteins; D009206:Myocardium / Q000378:metabolism; D054730:Protein Interaction Domains and Motifs; D017434:Protein Structure, Tertiary; D051381:Rats; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D020798:Two-Hybrid System Techniques
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D051017:Apoptosis Regulatory Proteins; D047908:Intracellular Signaling Peptides and Proteins; D046912:Multiprotein Complexes; D009124:Muscle Proteins; C100494:RTKN protein, human; D011994:Recombinant Proteins; C486523:SORBS3 protein, human; D019204:GTP-Binding Proteins