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Mol. Cell. Biol., 08 1995, 4403-4409, Vol 15, No. 8
AG Batzer, P Blaikie, K Nelson, J Schlessinger and B Margolis
Shc is an SH2 domain protein that is tyrosine phosphorylated in cells
stimulated with a variety of growth factors and cytokines. Once
phosphorylated, Shc binds the Grb2-Sos complex, leading to Ras activation.
Shc can interact with tyrosine-phosphorylated proteins by binding to
phosphotyrosine in the context of an NPXpY motif, where pY is a
phosphotyrosine. This is an unusual binding site for an SH2 domain protein
whose binding specificity is usually controlled by residues carboxy
terminal, not amino terminal, to the phosphotyrosine. Recently we
identified a second region in Shc, named the phosphotyrosine interaction
(PI) domain, and we have found it to be present in a variety of other
cellular proteins. In this study we used a dephosphorylation protection
assay, competition analysis with phosphotyrosine-containing synthetic
peptides, and epidermal growth factor receptor (EGFR) mutants to determine
the binding sites of the PI domain of Shc on the EGFR. We demonstrate that
the PI domain of Shc binds the LXNPXpY motif that encompasses Y-1148 of the
activated EGFR. We conclude that the PI domain imparts to Shc its ability
to bind the NPXpY motif.
Copyright © 1995, American Society for Microbiology
The phosphotyrosine interaction domain of Shc binds an LXNPXY motif on the epidermal growth factor receptor
Department of Pharmacology, New York University Medical Center, New York, USA.
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