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Updated: Jul 29, 2026

Assaying Protein Kinase Activity with Radiolabeled ATP
Published on: May 26, 2017
Modulation of human checkpoint kinase Chk1 by the regulatory beta-subunit of protein kinase CK2
Barbara Guerra1, Olaf-Georg Issinger, Jean Y J Wang
1Division of Biological Sciences 0322, University of California, San Diego, CA 92093-0322, USA. bag@bmb.sdu.dk
Abstract:
Protein kinase CK2 is a serine/threonine protein kinase involved in various aspects of cellular regulation. The regulatory beta-subunit of CK2 exerts a central role not only in mediating formation of tetrameric CK2 complexes but also as a docking partner for several protein kinases. In this study, CK2beta is found to interact with the human cell cycle checkpoint kinase Chk1. The Chk1-interacting region of CK2beta is localized at the C-terminus and the complex between CK2beta and Chk1 is devoid of the catalytic CK2alpha-subunit. The interaction between CK2beta and Chk1 leads to an increase in the Cdc25C phosphorylation activity of Chk1. The screening of several cell lines has revealed that the association between CK2beta and Chk1 also occurs in vivo at a different degree. Collectively, these studies confirm the implication of the regulatory beta-subunit of protein kinase CK2 in cell cycle regulation and identify a novel mechanism for the activation of Chk1 protein kinase.
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