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Protein Kinase C-Mediated Phosphorylation of Kvβ2 in Adult Rat Brain

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Abstract

The phosphorylation of Kvβ2 was investigated by different protein kinases. Protein kinase A catalytic subunit (PKA-CS) yielded the greatest phosphorylation of recombinant Kvβ2 (rKvβ2), with limited phosphorylation by protein kinase C catalytic subunit (PKC-CS) and no detectable phosphorylation by casein kinase II (CKII). Protein kinase(s) from adult rat brain lysate phosphorylated both rKvβ2 and endogenous Kvβ. The PKA inhibitor, PKI 6-22, fully inhibited PKA-mediated phophorylation of rKvβ2 yet showed minimal inhibition of kinase activity present in rat brain. The inhibitor Gö 6983, that blocks PKCα, PKCβ, PKCγ, PKCδ and PKCζ activities, inhibited rKvβ2 phosphorylation by rat brain kinases, with no inhibition by Gö 6976 which blocks PKCα and PKCβΙ activities. Dose-response analysis of Gö 6983 inhibitory activity indicates that at least two PKC isozymes account for the kinase activity present in rat brain. Τhus, while PKA was the most active protein kinase to phosphorylate rKvβ2 in vitro, Kvβ2 phosphorylation in the rat brain is mainly mediated by PKC isozymes.

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Authors and Affiliations

  1. Department of Pathology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA

    Xintao Wang, Stan M. Berkowski, Heather Knowleg, A. B. Chandramouly, Martha Downens & Michael B. Prystowsky

  2. Department of Microbiology and Immunology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA

    Jie Zhang

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Wang, X., Zhang, J., Berkowski, S.M. et al. Protein Kinase C-Mediated Phosphorylation of Kvβ2 in Adult Rat Brain. Neurochem Res 29, 1879–1886 (2004). https://doi.org/10.1023/B:NERE.0000042215.92952.3d

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