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Src homology 3 (SH3) domains have been implicated in mediating protein-protein interactions in receptor signaling processes; however, the precise role of this domain remains unclear. In this report, affinity purification techniques were used to identify the GTPase dynamin as an SH3 domain-binding protein. Selective binding to a subset of 15 different recombinant SH3 domains occurs through proline-rich sequence motifs similar to those that mediate the interaction of the SH3 domains of Grb2 and Abl proteins to the guanine nucleotide exchange protein, Sos, and to the 3BP1 protein, respectively. Dynamin GTPase activity is stimulated by several of the bound SH3 domains, suggesting that the function of the SH3 module is not restricted to protein-protein interactions but may also include the interactive regulation of GTP-binding proteins.
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