1U6R

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.165 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

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.,Sect.D 63: 381-389

  • DOI: 10.1107/S0907444906056204

  • 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 regul ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Creatine kinase, M chain
A, B
380Oryctolagus cuniculusMutation(s): 1 
Gene Names: CKM
EC: 2.7.3.2
Find proteins for P00563 (Oryctolagus cuniculus)
Go to Gene View: CKM
Go to UniProtKB:  P00563
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, B
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
IOM
Query on IOM

Download SDF File 
Download CCD File 
B
(DIAMINOMETHYL-METHYL-AMINO)-ACETIC ACID
C4 H11 N3 O2
YNHURFGTTODJOO-UHFFFAOYSA-N
 Ligand Interaction
NO3
Query on NO3

Download SDF File 
Download CCD File 
B
NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.165 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 48.689α = 90.00
b = 92.572β = 90.00
c = 165.553γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
REFMACrefinement
MOLREPphasing
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-08-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2016-11-16
    Type: Database references