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. 1992 Aug 1;176(2):373–379. doi: 10.1084/jem.176.2.373

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

PMCID: PMC2119313  PMID: 1500851

Abstract

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.

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Selected References

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