| Structural highlights
3c13 is a 1 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | , |
| Related: | 3bqc, 1jwh, 1f0q, 2rkp, 2pvr, 1pjk, 1lp4 |
| Gene: | csnk2a1 (HUMAN) |
| Activity: | Non-specific serine/threonine protein kinase, with EC number 2.7.11.1 |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
[CSK21_HUMAN] Catalytic subunit of a constitutively active serine/threonine-protein kinase complex that phosphorylates a large number of substrates containing acidic residues C-terminal to the phosphorylated serine or threonine. Regulates numerous cellular processes, such as cell cycle progression, apoptosis and transcription, as well as viral infection. May act as a regulatory node which integrates and coordinates numerous signals leading to an appropriate cellular response. During mitosis, functions as a component of the p53/TP53-dependent spindle assembly checkpoint (SAC) that maintains cyclin-B-CDK1 activity and G2 arrest in response to spindle damage. Also required for p53/TP53-mediated apoptosis, phosphorylating 'Ser-392' of p53/TP53 following UV irradiation. Can also negatively regulate apoptosis. Phosphorylates the caspases CASP9 and CASP2 and the apoptotic regulator NOL3. Phosphorylation protects CASP9 from cleavage and activation by CASP8, and inhibits the dimerization of CASP2 and activation of CASP8. Regulates transcription by direct phosphorylation of RNA polymerases I, II, III and IV. Also phosphorylates and regulates numerous transcription factors including NF-kappa-B, STAT1, CREB1, IRF1, IRF2, ATF1, SRF, MAX, JUN, FOS, MYC and MYB. Phosphorylates Hsp90 and its co-chaperones FKBP4 and CDC37, which is essential for chaperone function. Regulates Wnt signaling by phosphorylating CTNNB1 and the transcription factor LEF1. Acts as an ectokinase that phosphorylates several extracellular proteins. During viral infection, phosphorylates various proteins involved in the viral life cycles of EBV, HSV, HBV, HCV, HIV, CMV and HPV.[1] [2] [3] [4]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The Ser/Thr kinase CK2 (former name: casein kinase 2) is a heterotetrameric enzyme composed of two catalytic chains (CK2alpha) attached to a dimer of noncatalytic subunits. Together with the cyclin-dependent kinases and the mitogen-activated protein kinases, CK2alpha belongs to the CMGC family of the eukaryotic protein kinases. CK2 is an important survival and stability factor in eukaryotic cells: its catalytic activity is elevated in a wide variety of tumors while its down-regulation can lead to apoptosis. Thus, CK2 is a valuable target for drug development and for chemical biology approaches of cell biological research, and small organic inhibitors addressing CK2 are of considerable interest. We describe here the complex structure between a C-terminal deletion mutant of human CK2alpha and the ATP-competitive inhibitor emodin (1,3,8-trihydroxy-6-methylanthraquinone, International Union of Pure and Applied Chemistry name: 1,3,8-trihydroxy-6-methylanthracene-9,10-dione) and compare it with a previously published complex structure of emodin and maize CK2alpha. With a resolution of 1.5 A, the human CK2alpha/emodin structure has a much better resolution than its maize counterpart (2.6 A). Even more important, in spite of a sequence identity of more than 77% between human and maize CK2alpha, the two structures deviate significantly in the orientation, in which emodin is trapped by the enzyme, and in the local conformations around the ligand binding site: maize CK2alpha shows its largest adaptations in the ATP-binding loop, whereas human CK2alpha shows its largest adaptations in the hinge region connecting the two main domains of the protein kinase core. These observations emphasize the importance of local plasticity for ligand binding and demonstrate that two orthologues of an enzyme can behave quite different in this respect.
The catalytic subunit of human protein kinase CK2 structurally deviates from its maize homologue in complex with the nucleotide competitive inhibitor emodin.,Raaf J, Klopffleisch K, Issinger OG, Niefind K J Mol Biol. 2008 Mar 14;377(1):1-8. Epub 2008 Jan 11. PMID:18242640[5]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Keller DM, Zeng X, Wang Y, Zhang QH, Kapoor M, Shu H, Goodman R, Lozano G, Zhao Y, Lu H. A DNA damage-induced p53 serine 392 kinase complex contains CK2, hSpt16, and SSRP1. Mol Cell. 2001 Feb;7(2):283-92. PMID:11239457
- ↑ Sayed M, Pelech S, Wong C, Marotta A, Salh B. Protein kinase CK2 is involved in G2 arrest and apoptosis following spindle damage in epithelial cells. Oncogene. 2001 Oct 25;20(48):6994-7005. PMID:11704824 doi:10.1038/sj.onc.1204894
- ↑ Shin S, Lee Y, Kim W, Ko H, Choi H, Kim K. Caspase-2 primes cancer cells for TRAIL-mediated apoptosis by processing procaspase-8. EMBO J. 2005 Oct 19;24(20):3532-42. Epub 2005 Sep 29. PMID:16193064 doi:10.1038/sj.emboj.7600827
- ↑ St-Denis NA, Derksen DR, Litchfield DW. Evidence for regulation of mitotic progression through temporal phosphorylation and dephosphorylation of CK2alpha. Mol Cell Biol. 2009 Apr;29(8):2068-81. doi: 10.1128/MCB.01563-08. Epub 2009 Feb, 2. PMID:19188443 doi:10.1128/MCB.01563-08
- ↑ Raaf J, Klopffleisch K, Issinger OG, Niefind K. The catalytic subunit of human protein kinase CK2 structurally deviates from its maize homologue in complex with the nucleotide competitive inhibitor emodin. J Mol Biol. 2008 Mar 14;377(1):1-8. Epub 2008 Jan 11. PMID:18242640 doi:http://dx.doi.org/10.1016/j.jmb.2008.01.008
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