CK2α and CK2α' are the two isoforms of the catalytic subunit of human protein kinase CK2, an important target for cancer therapy. They have similar, albeit not identical functional and structural properties, and were occasionally reported to be inhibited with distinct efficacies by certain ATP-competitive ligands ...
CK2α and CK2α' are the two isoforms of the catalytic subunit of human protein kinase CK2, an important target for cancer therapy. They have similar, albeit not identical functional and structural properties, and were occasionally reported to be inhibited with distinct efficacies by certain ATP-competitive ligands. Here, we present THN27, an indeno[1,2- b ]indole derivative, as a further inhibitor with basal isoform selectivity. The selectivity disappears when measured using CK2α/CK2α' complexes with CK2β, the regulatory CK2 subunit. Co-crystal structures of THN27 with CK2α and CK2α' reveal that subtle differences in the conformational variability of the interdomain hinge region are correlated with the observed effect. In the case of CK2α', a crystallographically problematic protein so far, this comparative structural analysis required the development of an experimental strategy that finally enables atomic resolution structure determinations with ab initio phasing of potentially any ATP-competitive CK2 inhibitor and possibly many non-ATP-competitive ligands as well bound to CK2α'.
Related Citations:
Unexpected Binding Mode of a Potent Indeno[1,2-b]indole-Type Inhibitor of Protein Kinase CK2 Revealed by Complex Structures with the Catalytic Subunit CK2alpha and Its Paralog CK2alpha' Hochscherf, J., Lindenblatt, D., Witulski, B., Birus, R., Aichele, D., Marminon, C., Bouaziz, Z., Le Borgne, M., Jose, J., Niefind, K. (2017) Pharmaceuticals (Basel) 10: --
Crystal structure of a C-terminal deletion mutant of human protein kinase CK2 catalytic subunit. Ermakova, I., Boldyreff, B., Issinger, O.G., Niefind, K. (2003) J Mol Biol 330: 925
Organizational Affiliation:
Department für Chemie, Institut für Biochemie, Universität zu Köln, Zülpicher Straße 47, D-50674 Köln, Germany.
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