A role for Pyk2 and Src in linking G-protein-coupled receptors with MAP kinase activation (original) (raw)

Nature volume 383, pages 547–550 (1996)Cite this article

Abstract

THE mechanisms by which mitogenic G-protein-coupled receptors activate the MAP kinase signalling pathway are poorly understood. Candidate protein tyrosine kinases that link G-protein-coupled receptors with MAP kinase include Src family kinases1, the epidermal growth factor receptor2, Lyn and Syk3. Here we show that lysophosphatidic acid (LPA) and bradykinin induce tyrosine phosphorylation of Pyk2 and complex formation between Pyk2 and activated Src. Moreover, tyrosine phosphorylation of Pyk2 leads to binding of the SH2 domain of Src to tyrosine 402 of Pyk2 and activation of Src. Transient overexpres-sion of a dominant interfering mutant of Pyk2 or the protein tyrosine kinase Csk reduces LPA- or bradykinin-induced activation of MAP kinase. LPA- or bradykinin-induced MAP kinase activation was also inhibited by overexpression of dominant interfering mutants of Grb2 and Sos. We propose that Pyk2 acts with Src to link Gi- and Gq-coupled receptors with Grb2 and Sos to activate the MAP kinase signalling pathway in PC12 cells.

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Authors and Affiliations

  1. Department of Pharmacology, New York University Medical Center, 550 First Avenue, New York, New York, 10016, USA
    Ivan Dikic, George Tokiwa & Joseph Schlessinger
  2. SUGEN Inc., 515 Galveston Drive, Redwood City, California, 94063, USA
    Sima Lev & Sara A. Courtneidge

Authors

  1. Ivan Dikic
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  2. George Tokiwa
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  3. Sima Lev
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  4. Sara A. Courtneidge
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  5. Joseph Schlessinger
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Dikic, I., Tokiwa, G., Lev, S. et al. A role for Pyk2 and Src in linking G-protein-coupled receptors with MAP kinase activation.Nature 383, 547–550 (1996). https://doi.org/10.1038/383547a0

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