Transition state analog complex of muscle creatine kinase (R134K) mutant

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 

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Structural asymmetry and intersubunit communication in muscle creatine kinase

Ohren, J.F.Kundracik, M.L.Borders Jr, C.L.Edmiston, P.Viola, R.E.

(2007) Acta Crystallogr D Biol Crystallogr 63: 381-389

  • DOI: https://doi.org/10.1107/S0907444906056204
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure of a transition-state analog complex of a highly soluble mutant (R134K) of rabbit muscle creatine kinase (rmCK) has been determined to 1.65 A resolution in order to elucidate the structural changes that are required to support and regulate catalysis. Significant structural asymmetry is seen within the functional homodimer of rmCK, with one monomer found in a closed conformation with the active site occupied by the transition-state analog components creatine, MgADP and nitrate. The other monomer has the two loops that control access to the active site in an open conformation and only MgADP is bound. The N-terminal region of each monomer makes a substantial contribution to the dimer interface; however, the conformation of this region is dramatically different in each subunit. Based on this structural evidence, two mutational modifications of rmCK were conducted in order to better understand the role of the amino-terminus in controlling creatine kinase activity. The deletion of the first 15 residues of rmCK and a single point mutant (P20G) both disrupt subunit cohesion, causing the dissociation of the functional homodimer into monomers with reduced catalytic activity. This study provides support for a structural role for the amino-terminus in subunit association and a mechanistic role in active-site communication and catalytic regulation.

  • Organizational Affiliation

    Department of Chemistry, The University of Toledo, Toledo, Ohio 43606, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Creatine kinase, M chain
A, B
380Oryctolagus cuniculusMutation(s): 1 
Gene Names: CKM
Find proteins for P00563 (Oryctolagus cuniculus)
Explore P00563 
Go to UniProtKB:  P00563
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00563
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.689α = 90
b = 92.572β = 90
c = 165.553γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
CCP4data 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: 2005-08-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2016-11-16
    Changes: Database references
  • Version 1.4: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-08-23
    Changes: Data collection, Refinement description