Crystal structure of human protein kinase CK2 regulatory subunit (CK2beta; mutant 1-193)

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.176 

Starting Model: experimental
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The interaction of CK2{alpha} and CK2{beta}, the subunits of protein kinase CK2, requires CK2{beta} in a preformed conformation and is enthalpically driven

Raaf, J.Brunstein, E.Issinger, O.-G.Niefind, K.

(2008) Protein Sci 17: 2180-2186

  • DOI: https://doi.org/10.1110/ps.037770.108
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The protein kinase CK2 (former name: "casein kinase 2") predominantly occurs as a heterotetrameric holoenzyme composed of two catalytic chains (CK2alpha) and two noncatalytic subunits (CK2beta). The CK2beta subunits form a stable dimer to which the CK2alpha monomers are attached independently. In contrast to the cyclins in the case of the cyclin-dependent kinases CK2beta is no on-switch of CK2alpha; rather the formation of the CK2 holoenzyme is accompanied with an overall change of the enzyme's profile including a modulation of the substrate specificity, an increase of the thermostability, and an allocation of docking sites for membranes and other proteins. In this study we used C-terminal deletion variants of human CK2alpha and CK2beta that were enzymologically fully competent and in particular able to form a heterotetrameric holoenzyme. With differential scanning calorimetry (DSC) we confirmed the strong thermostabilization effect of CK2alpha on CK2beta with an upshift of the CK2alpha melting temperature of more than 9 degrees . Using isothermal titration calorimetry (ITC) we measured a dissociation constant of 12.6 nM. This high affinity between CK2alpha and CK2beta is mainly caused by enthalpic rather than entropic contributions. Finally, we determined a crystal structure of the CK2beta construct to 2.8 A resolution and revealed by structural comparisons with the CK2 holoenzyme structure that the CK2beta conformation is largely conserved upon association with CK2alpha, whereas the latter undergoes significant structural adaptations of its backbone.

  • Organizational Affiliation

    Universität zu Köln, Department für Chemie, Institut fü r Biochemie, D-50674 Köln, Germany.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Casein kinase II subunit beta
A, B
193Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P67870 (Homo sapiens)
Explore P67870 
Go to UniProtKB:  P67870
GTEx:  ENSG00000204435 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP67870
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.176 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.463α = 90
b = 116.463β = 90
c = 76.088γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description