Non-SH2 domains within insulin receptor substrate-1 and SHC mediate their phosphotyrosine-dependent interaction with the NPEY motif of the insulin-like growth factor I receptor.

The Journal of Biological Chemistry
A CraparoT A Gustafson

Abstract

Insulin receptor substrate-1 (IRS-1) and SHC become rapidly phosphorylated upon tyrosines after insulin-like growth factor I receptor (IGFIR) activation. In this study we demonstrate that IRS-1, SHC, and the p85 subunit of phosphatidylinositol 3-kinase interact directly and specifically with the IGFIR. The interaction of all three proteins is dependent upon IGFIR kinase activity and, furthermore, substitution of Tyr-950 with Phe within the NPEY motif of the IGFIR eliminated interaction with both SHC and IRS-1 but had no effect upon p85 interaction. We show that residues 160-516 of IRS-1 and 1-238 of SHC are sufficient and necessary for receptor interaction in the yeast two-hybrid assay. We also demonstrate a direct in vitro interaction between the IGFIR and a fusion protein containing SHC amino acids 1-238. No interaction was observed with a SHC protein containing only the SH2 domain. We conclude that SHC and IRS-1 interact with the tyrosine-phosphorylated NPEY motif of the IGFIR, and that both proteins interact via related motifs located in their amino termini. We conclude that the interactions of SHC and IRS-1 with the IGFIR are similar to those which we have previously defined with the insulin receptor.

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