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J Biol Chem, Vol. 273, Issue 23, 14301-14308, June 5, 1998

Identification of a New Pyk2 Isoform Implicated in Chemokine and Antigen Receptor Signaling

Ivan Dikic^§, Inga Dikic, and Joseph Schlessinger^§

From the  Ludwig Institute for Cancer Research, Uppsala, S-75124, Sweden and the ^§ Department of Pharmacology, New York University Medical Center, New York, New York 10016

Pyk2 is a protein tyrosine kinase that links G-protein-coupled receptors, inflammatory cytokines, and extracellular stimuli that elevate intracellular calcium concentration with activation of the mitogen-activated protein kinase pathways and regulation of ion channel functions. Here we describe the identification, cloning, and characterization of a new isoform of Pyk2 (Pyk2-H) that is generated by alternative RNA splicing. Pyk2-H is mainly expressed in hematopoietic cells including T-cells, B-cells, and natural killer cells. Engagement of T-cell or B-cell antigen receptors leads to rapid tyrosine phosphorylation of Pyk2-H. Pyk2-H is also activated in response to the chemokines RANTES and macrophage inflammatory protein-1 in T cells. In addition, we show that glutathione S-transferase fusion proteins containing the carboxyl termini of Pyk2 and Pyk2-H bind to a different set of tyrosine-phosphorylated proteins in thymus lysates. Specific expression of Pyk2-H and its activation by antigens or chemokines in hematopoietic cells may contribute toward the generation of cell type-specific signals involved in host immune responses.

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