alexa LAT: the ZAP-70 tyrosine kinase substrate that links T cell receptor to cellular activation.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Zhang W, SloanLancaster J, Kitchen J, Trible RP, Samelson LE

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Abstract Despite extensive study, several of the major components involved in T cell receptor-mediated signaling remain unidentified. Here we report the cloning of the cDNA for a highly tyrosine-phosphorylated 36-38 kDa protein, previously characterized by its association with Grb2, phospholipase C-gamma1, and the p85 subunit of phosphoinositide 3-kinase. Deduced amino acid sequence identifies a novel integral membrane protein containing multiple potential tyrosine phosphorylation sites. We show that this protein is phosphorylated by ZAP-70/Syk protein tyrosine kinases leading to recruitment of multiple signaling molecules. Its function is demonstrated by inhibition of T cell activation following overexpression of a mutant form lacking critical tyrosine residues. Therefore, we propose to name the molecule LAT-linker for activation of T cells.
This article was published in Cell and referenced in Journal of Clinical & Cellular Immunology

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