4NH1

Crystal structure of a heterotetrameric CK2 holoenzyme complex carrying the Andante-mutation in CK2beta and consistent with proposed models of autoinhibition and trans-autophosphorylation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 

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Literature

The Protein Kinase CK2(Andante) Holoenzyme Structure Supports Proposed Models of Autoregulation and Trans-Autophosphorylation

Schnitzler, A.Olsen, B.B.Issinger, O.-G.Niefind, K.

(2014) J Mol Biol 426: 1871-1882

  • DOI: 10.1016/j.jmb.2014.02.018
  • Primary Citation of Related Structures:  
    4NH1

  • PubMed Abstract: 
  • Eukaryotic protein kinases are typically strictly controlled by second messenger binding, protein/protein interactions, dephosphorylations or similar processes. None of these regulatory mechanisms is known to work for protein kinase CK2 (former name "casein kinase 2"), an acidophilic and constitutively active eukaryotic protein kinase ...

    Eukaryotic protein kinases are typically strictly controlled by second messenger binding, protein/protein interactions, dephosphorylations or similar processes. None of these regulatory mechanisms is known to work for protein kinase CK2 (former name "casein kinase 2"), an acidophilic and constitutively active eukaryotic protein kinase. CK2 predominantly exists as a heterotetrameric holoenzyme composed of two catalytic subunits (CK2α) complexed to a dimer of non-catalytic subunits (CK2β). One model of CK2 regulation was proposed several times independently by theoretical docking of the first CK2 holoenzyme structure. According to this model, the CK2 holoenzyme forms autoinhibitory aggregates correlated with trans-autophosphorylation and driven by the down-regulatory affinity between an acidic loop of CK2β and the positively charged substrate binding region of CK2α from a neighboring CK2 heterotetramer. Circular trimeric aggregates in which one-half of the CK2α chains show the predicted inhibitory proximity between those regions were detected within the crystal packing of the human CK2 holoenzyme. Here, we present further in vitro support of the "regulation-by-aggregation" model by an alternative crystal form in which CK2 tetramers are arranged as approximately linear aggregates coinciding essentially with the early predictions. In this assembly, the substrate binding region of every CK2α chain is blocked by a CK2β acidic loop from a neighboring tetramer. We found these crystals with CK2(Andante) that contains a CK2β variant mutated in a CK2α-contact helix and described to be responsible for a prolonged circadian rhythm in Drosophila. The increased propensity of CK2(Andante) to form aggregates with completely blocked active sites may contribute to this phenotype.


    Related Citations: 
    • Biochemical characterization of the recombinant human Drosophila homologues Timekeeper and Andante involved in the Drosophila circadian oscillator.
      Rasmussen, T., Skjth, I.H., Jensen, H.H., Niefind, K., Boldyreff, B., Issinger, O.G.
      (2005) Mol Cell Biochem 274: 151
    • Crystal structure of human protein kinase CK2: insights into basic properties of the CK2 holoenzyme.
      Niefind, K., Guerra, B., Ermakowa, I., Issinger, O.G.
      (2001) EMBO J 20: 5320
    • Primary and secondary interactions between CK2alpha and CK2beta lead to ring-like structures in the crystals of the CK2 holoenzyme.
      Niefind, K., Issinger, O.G.
      (2005) Mol Cell Biochem 274: 3

    Organizational Affiliation

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Casein kinase II subunit alphaA, B335Homo sapiensMutation(s): 0 
Gene Names: CSNK2A1CK2A1
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for P68400 (Homo sapiens)
Explore P68400 
Go to UniProtKB:  P68400
PHAROS:  P68400
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP68400
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Casein kinase II subunit betaC, D215Homo sapiensMutation(s): 1 
Gene Names: CSNK2BCK2NG5A
UniProt & NIH Common Fund Data Resources
Find proteins for P67870 (Homo sapiens)
Explore P67870 
Go to UniProtKB:  P67870
PHAROS:  P67870
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP67870
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 210.537α = 90
b = 57.441β = 118.54
c = 139.394γ = 90
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-12
    Type: Initial release
  • Version 1.1: 2014-04-16
    Changes: Database references