Dec 2009 Molecular and cellular biology

Alternative splicing modulates autoinhibition and SH3 accessibility in the Src kinase Fyn.

Auteurs

Brignatz C, Paronetto MP, Opi S, Cappellari M, Audebert S, Feuillet V, Bismuth G, Arold ST, Sette C, Collette Y

Résumé

Src family kinases are central regulators of a large number of signaling pathways. To adapt to the idiosyncrasies of different cell types, these kinases may need a fine-tuning of their intrinsic molecular control mechanisms. Here, we describe on a molecular level how the Fyn kinase uses alternative splicing to adapt to different cellular environments. Using structural analysis, site-directed mutagenesis, and functional analysis, we show how the inclusion of either exon 7A or 7B affects the autoinhibition of Fyn and how this changes the SH3-dependent interaction and tyrosine phosphorylation of Sam68, with functional consequences for the Sam68-regulated survival of epithelial cells. Our results illustrate a novel mechanism of evolution that may contribute to the complexity of Src kinase regulation.

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