3JUH

Crystal structure of a mutant of human protein kinase CK2alpha with altered cosubstrate specificity


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.158 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Inclining the purine base binding plane in protein kinase CK2 by exchanging the flanking side-chains generates a preference for ATP as a cosubstrate

Yde, C.W.Ermakova, I.Issinger, O.-G.Niefind, K.

(2005) J Mol Biol 347: 399-414

  • DOI: 10.1016/j.jmb.2005.01.003
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Protein kinase CK2 (casein kinase 2) is a highly conserved and ubiquitously found eukaryotic serine/threonine kinase that plays a role in various cellular key processes like proliferation, apoptosis and circadian rhythm. One of its prominent biochemi ...

    Protein kinase CK2 (casein kinase 2) is a highly conserved and ubiquitously found eukaryotic serine/threonine kinase that plays a role in various cellular key processes like proliferation, apoptosis and circadian rhythm. One of its prominent biochemical properties is its ability to use GTP as well as ATP as a cosubstrate (dual-cosubstrate specificity). This feature is exceptional among eukaryotic protein kinases, and its biological significance is unknown. We describe here a mutant of the catalytic subunit of protein kinase CK2 (CK2alpha) from Homo sapiens (hsCK2alpha) with a clear and CK2-atypical preference for ATP compared to GTP. This mutant was designed on the basis of several structures of CK2alpha from Zea mays (zmCK2alpha) in complex with various ATP-competitive ligands. A structural overlay revealed the existence of a "purine base binding plane" harbouring the planar moiety of the respective ligand like the purine base of ATP and GTP. This purine base binding plane is sandwiched between the side-chains of Ile66 (Val66 in hsCK2alpha) and Met163, and it adopts a significantly different orientation than in prominent homologues like cAMP-dependent protein kinase (CAPK). By exchanging these two flanking amino acids (Val66Ala, Met163Leu) in hsCK2alpha(1-335), a C-terminally truncated variant of hsCK2alpha, the cosubstrate specificity shifted in the expected direction so that the mutant strongly favours ATP. A structure determination of the mutant in complex with an ATP-analogue confirmed the predicted change of the purine base binding plane orientation. An unexpected but in retrospect plausible consequence of the mutagenesis was, that the helix alpha D region, which is in the direct neighbourhood of the ATP-binding site, has adopted a conformation that is more similar to CAPK and less favourable for binding of GTP. These findings demonstrate that CK2alpha possesses sophisticated structural adaptations in favour of dual-cosubstrate specificity, suggesting that this property could be of biological significance.


    Related Citations: 
    • The CK2 alpha/CK2 beta interface of human protein kinase CK2 harbors a binding pocket for small molecules
      Raaf, J., Brunstein, E., Issinger, O.-G., Niefind, K.
      (2008) Chem Biol 15: 111
    • Conformational plasticity of the catalytic subunit of protein kinase CK2 and its consequences for regulation and drug design
      Niefind, K., Issinger, O.-G.
      (2010) Biochim Biophys Acta 1804: 484
    • Protein kinase CK2 in health and disease: Protein kinase CK2: from structures to insights
      Niefind, K., Raaf, J., Issinger, O.-G.
      (2009) Cell Mol Life Sci 66: 1800

    Organizational Affiliation

    Syddansk Universitet, Institut for Biokemi og Molekylaerbiologi, Campusvej 55, DK-5230 Odense, Denmark.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Casein kinase II subunit alpha
A, B
335Homo sapiensMutation(s): 2 
Gene Names: CSNK2A1CK2A1
EC: 2.7.11.1
Find proteins for P68400 (Homo sapiens)
Go to UniProtKB:  P68400
NIH Common Fund Data Resources
PHAROS  P68400
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP

Download CCD File 
A, B
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A, B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.158 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.368α = 90
b = 71.368β = 90
c = 126.467γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-10-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2011-10-26
    Changes: Database references