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Mol. Cell. Biol., 05 1995, 2500-2508, Vol 15, No. 5
TA Gustafson, W He, A Craparo, CD Schaub and TJ O'Neill
The SHC proteins have been implicated in insulin receptor (IR) signaling.
In this study, we used the sensitive two-hybrid assay of protein-protein
interaction to demonstrate that SHC interacts directly with the IR. The
interaction is mediated by SHC amino acids 1 to 238 and is therefore
independent of the Src homology 2 domain. The interaction is dependent upon
IR autophosphorylation, since the interaction is eliminated by mutation of
the IR ATP-binding site. In addition, mutational analysis of the
Asn-Pro-Glu-Tyr (NPEY) motif within the juxtamembrane domain of the IR
showed the importance of the Asn, Pro, and Tyr residues to both SHC and IR
substrate 1 (IRS-1) binding. We conclude that SHC interacts directly with
the IR and that phosphorylation of Tyr-960 within the IR juxtamembrane
domain is necessary for efficient interaction. This interaction is highly
reminiscent of that of IRS-1 with the IR, and we show that the SHC IR-
binding domain can substitute for that of IRS-1 in yeast and COS cells. We
identify a homologous region within the IR-binding domains of SHC and
IRS-1, which we term the SAIN (SHC and IRS-1 NPXY-binding) domain, which
may explain the basis of these interactions. The SAIN domain appears to
represent a novel motif which is able to interact with autophosphorylated
receptors such as the IR.
Copyright © 1995, American Society for Microbiology
Phosphotyrosine-dependent interaction of SHC and insulin receptor substrate 1 with the NPEY motif of the insulin receptor via a novel non- SH2 domain
Department of Physiology, University of Maryland School of Medicine, Baltimore 21201, USA.
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