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The zinc-binding region of IL-2 inducible T cell kinase (Itk) is required for interaction with G?13 and activation of Serum Response Factor #MMPMID23454662
Huang W; Morales JL; Gazivoda VP; Lai J; Qi Q; August A
Int J Biochem Cell Biol 2013[Jun]; 45 (6): 1074-82 PMID23454662show ga
Tec family kinases play critical roles in the activation of immune cells. In particular, Itk is important for the activation of T cells via the T cell Receptor (TcR), however, molecules that cooperate with Itk to activate downstream targets remain little explored. Here we show that Itk interacts with the heterotrimeric G-protein ! subunit G?13 during TcR triggering. This interaction requires membrane localization of both partners, and is partially dependent on GDP-and GTP-bound states of G?13. Furthermore, we find that Itk interacts with G?13 via the zinc binding regions within its Tec homology domain. The interaction between Itk and G?13 also results in tyrosine phosphorylation of G?13, however this is not required for the interaction. Itk enhances G?13 mediated activation of Serum Response Factor (SRF) transcriptional activity dependent on its ability to interact with G?13, but its kinase activity is not required to enhance SRF activity. These data reveal a new pathway regulated by Itk in cells, and suggest cross talk between Itk and G-protein signaling downstream of the TcR.