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Catalytic specificity of protein-tyrosine kinases is critical for selective signalling

Abstract

HOW do distinct protein-tyrosine kinases activate specific downstream events? Src-homology-2 (SH2) domains on tyrosine kinases or targets of tyrosine kinases recognize phosphotyrosine in a specific sequence context and thereby provide some specificity1–3. The role of the catalytic site of tyrosine kinases in determining target specificity has not been fully investigated. Here we use a degenerate peptide library to show that each of nine tyrosine kinases investigated has a unique optimal peptide substrate. We find that the cytosolic tyrosine kinases preferentially phosphorylate peptides recognized by their own SH2 domains or closely related SH2 domains (group I; ref. 3), whereas receptor tyrosine kinases preferentially phosphorylate peptides recognized by subsets of group III SH2 domains3. The importance of these findings for human disease is underscored by our observation that a point mutation in the RET receptor-type tyrosine kinase, which causes multiple endocrine neoplasia type 2B, results in a shift in peptide substrate specificity.

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Songyang, Z., Carraway , K., Eck, M. et al. Catalytic specificity of protein-tyrosine kinases is critical for selective signalling. Nature 373, 536–539 (1995). https://doi.org/10.1038/373536a0

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