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• W1971997730 abstract "Background: Shc and Grb2 form a complex in cells in response to growth factor stimulation and link tyrosine kinases to Ras during the resulting signaling process. Shc and Grb2 each contain domains that mediate interactions with other unidentified intracellular proteins. For example, the Shc PTB domain binds to 130 kDa and 145 kDa tyrosine-phosphorylated proteins in response to stimulation of cells by growth factors, cytokines and crosslinking of antigen receptors. The Grb2 SH3 domains bind to an unidentified 116 kDa protein in T cells. We have identified three proteins, of 110 kDa, 130 kDa and 145 kDa, as a new family of molecules encoded by the same gene. In vivo studies show that these proteins form signal transduction complexes with Shc and with Grb2.Results The 130 kDa and 145 kDa tyrosine-phosphorylated proteins that associate with the Shc PTB domain were purified by conventional chromatographic methods. Partial peptide and cDNA sequences corresponding to these proteins, termed SIP-145 and SIP-130 (SIP for signaling inositol polyphosphate 5-phosphatase), identified them as SH2 domain-containing products of a single gene and as members of the inositol polyphosphate 5-phosphatase family. The SIP-130 and SIP-145 proteins and inositol polyphosphate 5-phosphatase activity associated with Shc in vivo in response to B-cell activation. By using an independent approach, expression cloning, we found that the Grb2 SH3 domains bind specifically to SIP-110, a 110 kDa splice variant of SIP-145 and SIP-130, which lacks the SH2 domain. The SIP proteins hydrolyzed phosphatidylinositol (3,4,5)-trisphosphate (PtdIns (3,4,5)-P3) and Ins (1,3,4,5)-P4, but not PtdIns (4,5)-P2 or Ins (1,4,5)-P3.Conclusion These findings strongly implicate the inositol polyphosphate 5-phosphatases in Shc- and Grb2-mediated signal transduction. Furthermore, SIP-110, SIP-130 and SIP-145 prefer 3-phosphorylated substrates, suggesting a link to the phosphatidylinositol 3-kinase signaling pathway." @default.
• W1971997730 created "2016-06-24" @default.
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• W1971997730 date "1996-04-01" @default.
• W1971997730 modified "2023-09-27" @default.
• W1971997730 title "Multiple forms of an inositol polyphosphate 5-phosphatase form signaling complexes with Shc and Grb2" @default.
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• W1971997730 doi "https://doi.org/10.1016/s0960-9822(02)00511-0" @default.
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