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J. Biol. Chem., Vol. 269, Issue 44, 27186-27192, 11, 1994
PA Staubs, DR Reichart, AR Saltiel, KL Milarski, H Maegawa, P Berhanu, JM Olefsky and BL Seely
The insulin receptor is known to interact with the SH2 domain proteins p85
(the regulatory subunit of phosphatidylinositol 3-kinase), Syp (a tyrosine
phosphatase), and GAP (GTPase-activating protein). In this study, we mapped
the insulin receptor binding sites for each of these proteins by examining
the ability of phosphopeptides, corresponding to insulin receptor
phosphorylation sites, and mutant insulin receptors to inhibit an insulin
receptor-SH2 domain interaction. Precipitation of partially purified
insulin receptors by glutathione S-transferase fusion proteins containing
the N-terminal SH2 domains of p85 and GAP and both SH2 domains of Syp was
demonstrated. The effect of the addition of each phosphopeptide on insulin
receptor precipitation was tested. pY1322, the C-terminal insulin receptor
peptide, inhibited insulin receptor precipitation by both p85- and Syp-GST.
The NPXY internalization domain peptide inhibited insulin receptor
precipitation by GAP-GST. These data were confirmed by mutant insulin
receptor experiments. The insulin receptor C-terminal mutants, delta CT and
Y/F2, were not precipitated by p85- or Syp-GST and the NPXY mutant insulin
receptors, delta Ex16 and HI delta NPEY, were not precipitated by GAP-GST.
Therefore, we conclude that p85 and Syp bind to the insulin receptor C
terminus at tyrosine 1322 and GAP binds to the insulin receptor NPXY domain
at tyrosine 960.
Localization of the insulin receptor binding sites for the SH2 domain proteins p85, Syp, and GAP
Department of Medicine, University of California, San Diego 92093-0673.
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