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. 1991 Jan 15;88(2):627–631. doi: 10.1073/pnas.88.2.627

The noncatalytic src homology region 2 segment of abl tyrosine kinase binds to tyrosine-phosphorylated cellular proteins with high affinity.

B J Mayer 1, P K Jackson 1, D Baltimore 1
PMCID: PMC50865  PMID: 1703304

Abstract

Several proteins implicated in the regulation of cell proliferation contain a common noncatalytic domain, src homology region 2 (SH2). We have used the bacterially expressed SH2 domain of abl protein-tyrosine kinase to evaluate the ability of this domain to bind to cellular proteins. ablSH2 specifically bound to a number of tyrosine-phosphorylated proteins from cells transformed by tyrosine kinase oncogenes in a filter-binding assay and to a subset of those proteins in solution. The SH2 probe bound almost exclusively to tyrosine-phosphorylated proteins, and binding was eliminated by dephosphorylation of cell proteins. Free phosphotyrosine could partially disrupt SH2 binding, suggesting that phosphotyrosine is directly involved in the binding interaction. These results demonstrate that an SH2 domain is sufficient to confer direct, high-affinity phosphotyrosine-dependent binding to proteins and suggest a general role for SH2 domains in cellular signaling pathways.

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