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Here we report the first crystal structure of the SH3 domain of the cellular Src tyrosine kinase (c-Src-SH3) domain on its own. In the crystal two molecules of c-Src-SH3 exchange their –RT loops generating an intertwined dimer, in which the two SH3 units, preserving the binding site configuration, are oriented to allow simultaneous binding of two ligand molecules. The dimerization of c-Src-SH3 is...
SH3 domains from the Src family of tyrosine kinases represent an interesting example of the delicate balance between promiscuity and specificity characteristic of proline-rich ligand recognition by SH3 domains. The development of inhibitors of therapeutic potential requires a good understanding of the molecular determinants of binding affinity and specificity and relies on the availability of high...
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