title: Association of insulin receptor substrate 3 with SH2 domain-containing proteins in rat adipocytes.
abstract: We have recently purified and cloned a new member of the insulin receptor substrate family, designated insulin receptor substrate 3 (IRS-3), from rat adipocytes. The amino acid sequence of IRS-3 shows multiple potential sites for tyrosine phosphorylation in motifs which engage specific SH2 domain-containing proteins. In order to determine which SH2 domain proteins complex with IRS-3, we have searched for coimmunoprecipitation from lysates of untreated and insulin-stimulated adipocytes. Phosphatidylinositol 3-kinase and the tyrosine phosphatase SHP-2 complexed with the tyrosine phosphorylated form of IRS-3, whereas the phospholipase Cgamma did not, and the adaptor Grb2 did so to a much lesser extent. These findings complete the survey of SH2 domain proteins associated with each of the four known members of the IRS family and provide the framework for further analysis of the role of IRS-3 in insulin signaling.
authors.affiliation: Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire, 03755, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Ross
authors.forename: G E
authors.initials: GE
authors.lastname: Lienhard
authors.forename: B E
authors.initials: BE
authors.lastname: Lavan
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D017667:Adipocytes / Q000187:drug effects / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004789:Enzyme Activation; D051380:GRB2 Adaptor Protein; D066298:In Vitro Techniques; D007328:Insulin / Q000378:metabolism / Q000494:pharmacology; D055504:Insulin Receptor Substrate Proteins; D047908:Intracellular Signaling Peptides and Proteins; D007527:Isoenzymes / Q000378:metabolism; D016376:Oligonucleotides, Antisense / Q000235:genetics; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D051966:Phospholipase C gamma; D010750:Phosphoproteins / Q000737:chemistry / Q000378:metabolism*; D010766:Phosphorylation; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D011972:Receptor, Insulin / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D015398:Signal Transduction; D010738:Type C Phospholipases / Q000378:metabolism; D014443:Tyrosine / Q000737:chemistry; D018909:src Homology Domains
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D051380:GRB2 Adaptor Protein; C495950:Grb2 protein, rat; D007328:Insulin; D055504:Insulin Receptor Substrate Proteins; D047908:Intracellular Signaling Peptides and Proteins; C491584:Irs3 protein, rat; D007527:Isoenzymes; D016376:Oligonucleotides, Antisense; D010750:Phosphoproteins; D011506:Proteins; D014443:Tyrosine; D019869:Phosphatidylinositol 3-Kinases; D011972:Receptor, Insulin; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases; C516727:Ptpn11 protein, rat; C509250:Ptpn6 protein, rat; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D010738:Type C Phospholipases; D051966:Phospholipase C gamma