alexa Resting lymphocyte kinase (Rlk Txk) phosphorylates the YVKM motif and regulates PI 3-kinase binding to T-cell antigen CTLA-4.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Schneider H, Schwartzberg PL, Rudd CE

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Abstract CTLA-4 and CD28 are differentially expressed on T-cells. They bind to a common ligand B71/2 (CD80/86), however with different avidities. Unlike CD28 which augments the T-cell response, CTLA-4 operates predominately as a negative regulator of T-cell proliferation. The mechanism by which CTLA-4 can generate these intracellular signals is unclear. Little is known regarding the identity of the protein-tyrosine kinase(s) responsible for CTLA-4 phosphorylation and thus creating conditions for the reported binding to PI 3-kinase and the protein tyrosine phosphatase SHP-2. In this study, we demonstrate that Rlk (resting lymphocyte kinase) is capable of phosphorylating CTLA-4 at the YVKM motif. Consistent with this finding, Rlk is capable of providing conditions for the binding of the SH2 domains of PI 3-kinase to the receptor. CTLA-4 is therefore the first known substrate for Rlk suggesting the possibility that this kinase may participate in CTLA-4 function. Copyright 1998 Academic Press. This article was published in Biochem Biophys Res Commun and referenced in Journal of Clinical & Cellular Immunology

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