Abstract
As key components of cellular regulation and signal transduction, eukaryotic protein kinases (EPKs) are strictly regulated. Sophisticated control mechanisms of EPKs are necessary which typically include conformational changes of the enzymes in critical regions. Local structural plasticity is therefore a prerequisite of normal EPK function. Protein kinase CK2, a member of the CMGC family of EPKs, was regarded as an exception from this rule for a long time due to its constitutive activity (lack of an inactive state) and due to its structural rigidity in typical EPK control regions of its catalytic subunit CK2α like the activation segment and the helix αC. Gradually, however, several cases of inherent local plasticity within CK2α were detected, and questions about their crosstalk and their functional significance became an issue. It is very likely now that structural plasticity and dynamics is more important for CK2 function than believed previously. Novel interpretation methods of crystallographic data even confirm an allosteric communication between the ATP site and CK2β-binding site of CK2α which had been only hypothetically postulated before. Similarly, local mobilities of CK2α are subject to modern computational approaches suggesting conformational equilibria in solution as assumed previously. In summary, CK2 structural biology has reached now a mature phase in which sophisticated modern techniques overcome the limitations of classical crystallography so that structural dynamics rather than single “snapshots” is investigated.
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Acknowledgement
The contributions of Anja Asendorf, Anna Köhler and Nicole Splett are gratefully acknowledged. The work was supported by a grant from the Deutsche Forschungsgemeinschaft (DFG) to KNI (NI 643/4–1).
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Hochscherf, J., Schnitzler, A., Issinger, OG., Niefind, K. (2015). Impressions from the Conformational and Configurational Space Captured by Protein Kinase CK2. In: Ahmed, K., Issinger, OG., Szyszka, R. (eds) Protein Kinase CK2 Cellular Function in Normal and Disease States. Advances in Biochemistry in Health and Disease, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-319-14544-0_2
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