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Association of the tyrosine kinase LCK with phospholipase C-gamma 1 after stimulation of the T cell antigen receptor.

Stimulation of the T cell antigen receptor (TCR) activates a protein tyrosine kinase and leads to the tyrosine phosphorylation of phosphoinositide-specific phospholipase C-gamma 1 (PLC gamma 1). The molecular interactions involved in this phosphorylation are not known. After stimulation of the TCR on Jurkat T cells, tyrosine-phosphorylated proteins of 36, 38, 58, and 63 kD coprecipitate with PLC gamma 1. An identical pattern of proteins precipitate with TrpE fusion proteins that contain the Src homology (SH) 2 domains of PLC gamma 1, indicating that these regions of PLC gamma 1 are responsible for binding. TCR stimulation leads to an association between the SH2 domains of PLC gamma 1 and a protein tyrosine kinase, which, by peptide mapping, is identical to p56lck. These studies establish that p56lck associates with PLC gamma 1 as a result of TCR stimulation of Jurkat cells, suggesting that p56lck plays a central role in coupling the TCR to the activation of PLC gamma 1.[1]

References

  1. Association of the tyrosine kinase LCK with phospholipase C-gamma 1 after stimulation of the T cell antigen receptor. Weber, J.R., Bell, G.M., Han, M.Y., Pawson, T., Imboden, J.B. J. Exp. Med. (1992) [Pubmed]
 
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