Abstract
The ‘regulatory’β-subunit of protein kinase CK2 has previously been shown to interact with protein kinases such as A-Raf, c-Mos, Lyn and Chk1 in addition to the catalytic subunit of CK2. Sequence alignments suggest that these interactions have a structural basis, and hence other protein kinases harboring corresponding sequences may be potential interaction partners for CK2β. We show here that Chk2 specifically interacts with CK2β in vitro and in cultured cells, and that activation of Chk2 leads to a reduction of this interaction. Additionally, we show that the presence of the CK2β-subunit significantly reduces the Chk2-catalysed phosphorylation of p53 in vitro. These findings support the notion that CK2β can act as a general modulator of remote docking sites in protein kinase – substrate interactions.
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Acknowledgements
We thank Hans H Jensen for technical support and Dr B Boldyreff (KinaseDetect) for purification of p53 and Chk2. This work was supported by the Danish Cancer Society, Grant No. 002521109210 and the Danish Research Council, Grant No. 21-01-0511 to O-G Issinger, plus the Deutsche Forschungsgemeinschaft, Grants Wi 1376/3-1 to L Wiesmüller and NI 643/1-2 to K Niefind.
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Bjørling-Poulsen, M., Siehler, S., Wiesmüller, L. et al. The ‘regulatory’ β-subunit of protein kinase CK2 negatively influences p53-mediated allosteric effects on Chk2 activation. Oncogene 24, 6194–6200 (2005). https://doi.org/10.1038/sj.onc.1208762
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DOI: https://doi.org/10.1038/sj.onc.1208762
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