Complex structure of human protein kinase CK2 catalytic subunit with a thieno[2,3-d]pyrimidin inhibitor crystallized under high-salt conditions

Experimental Data Snapshot

  • Resolution: 2.71 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.223 

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Structural Hypervariability of the Two Human Protein Kinase CK2 Catalytic Subunit Paralogs Revealed by Complex Structures with a Flavonol- and a Thieno[2,3-d]pyrimidine-Based Inhibitor.

Niefind, K.Bischoff, N.Golub, A.G.Bdzhola, V.G.Balanda, A.O.Prykhod'ko, A.O.Yarmoluk, S.M.

(2017) Pharmaceuticals (Basel) 10

  • DOI: https://doi.org/10.3390/ph10010009
  • Primary Citation of Related Structures:  
    5M44, 5M4C, 5M4F, 5M4I, 5M4U, 5M56

  • PubMed Abstract: 

    Protein kinase CK2 is associated with a number of human diseases, among them cancer, and is therefore a target for inhibitor development in industry and academia. Six crystal structures of either CK2α, the catalytic subunit of human protein kinase CK2, or its paralog CK2α' in complex with two ATP-competitive inhibitors-based on either a flavonol or a thieno[2,3-d]pyrimidine framework-are presented. The structures show examples for extreme structural deformations of the ATP-binding loop and its neighbourhood and of the hinge/helix αD region, i.e., of two zones of the broader ATP site environment. Thus, they supplement our picture of the conformational space available for CK2α and CK2α'. Further, they document the potential of synthetic ligands to trap unusual conformations of the enzymes and allow to envision a new generation of inhibitors that stabilize such conformations.

  • Organizational Affiliation

    Department für Chemie, Institut für Biochemie, Universität zu Köln, Otto-Fischer-Straße 12-14, D-50674 Köln, Germany. Karsten.Niefind@uni-koeln.de.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Casein kinase II subunit alpha335Homo sapiensMutation(s): 0 
Gene Names: CSNK2A1CK2A1
UniProt & NIH Common Fund Data Resources
Find proteins for P68400 (Homo sapiens)
Explore P68400 
Go to UniProtKB:  P68400
PHAROS:  P68400
GTEx:  ENSG00000101266 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP68400
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.71 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.223 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.061α = 90
b = 72.061β = 90
c = 131.579γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermanyNI 643/4-2

Revision History  (Full details and data files)

  • Version 1.0: 2017-01-18
    Type: Initial release
  • Version 1.1: 2017-01-25
    Changes: Database references
  • Version 1.2: 2017-05-10
    Changes: Database references
  • Version 1.3: 2017-05-17
    Changes: Database references
  • Version 1.4: 2017-09-06
    Changes: Author supporting evidence
  • Version 1.5: 2024-01-17
    Changes: Data collection, Database references, Refinement description