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SH3 domains function as protein-protein interaction modules in assembly of signalling and endocytic protein complexes. Here we report investigations of the mechanism of regulation of the binding properties of the SH3 domains of intersectin (ITSN1) and Src kinase by alternative splicing. Comparative sequence analysis of ITSN1 and Src genes revealed the conservation of alternatively spliced microexons affecting the structure of the SH3 domains in vertebrates. We show that neuron-specific ITSN1 transcripts containing the microexon 20 that encodes five amino acid residues within the SH3A domain are expressed in zebrafish from the earliest stages of the development of the nervous system. Models of alternative isoforms of the ITSN1 SH3A domain revealed that the insertion encoded by the microexon is located at the beginning of the n-Src loop of this domain causing a shift of negatively charged amino acids towards the interaction interface. Mutational analysis confirmed the importance of translocation of these negatively charged amino acids for interaction with dynamin 1. We also identified a residue within the microexon-encoded insert in the SH3 domain of brain-specific variant of Src that abolishes interaction of the domain with dynamin 1. Thus microexons provide a mechanism for the control of tissue-specific interactions of ITSN1 and Src with their partners.
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