3C13

Low pH-value crystal structure of emodin in complex with the catalytic subunit of protein kinase CK2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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, O.-G.Niefind, K.

(2008) J Mol Biol 377: 1-8

  • DOI: 10.1016/j.jmb.2008.01.008
  • Primary Citation of Related Structures:  
    3C13, 3BQC

  • PubMed Abstract: 
  • 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 ...

    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.


    Organizational Affiliation

    Universität zu Köln, Institut für Biochemie, Zülpicher Strasse 47, D-50674 Köln, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Casein kinase II subunit alphaA335Homo 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
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EMO
Query on EMO

Download Ideal Coordinates CCD File 
D [auth A]3-METHYL-1,6,8-TRIHYDROXYANTHRAQUINONE
C15 H10 O5
RHMXXJGYXNZAPX-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
EMOIC50:  2000   nM  BindingDB
EMOIC50:  580   nM  BindingDB
EMOKi:  1850   nM  BindingDB
EMOIC50:  890   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.73α = 90
b = 45.68β = 111.8
c = 63.24γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-02-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description