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  • Title: Association of insulin receptor substrate 3 with SH2 domain-containing proteins in rat adipocytes.
    Author: Ross SA, Lienhard GE, Lavan BE.
    Journal: Biochem Biophys Res Commun; 1998 Jun 18; 247(2):487-92. PubMed ID: 9642156.
    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.
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