1GY3

pCDK2/cyclin A in complex with MgADP, nitrate and peptide substrate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.250 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Studies on Phospho-Cdk2/Cyclin a Bound to Nitrate, a Transition State Analogue: Implications for the Protein Kinase Mechanism

Cook, A.Lowe, E.D.Chrysina, E.D.Skamnaki, V.T.Oikonomakos, N.G.Johnson, L.N.

(2002) Biochemistry 41: 7301


  • PubMed Abstract: 
  • Eukaryotic protein kinases catalyze the phosphoryl transfer of the gamma-phosphate of ATP to the serine, threonine, or tyrosine residue of protein substrates. The catalytic mechanism of phospho-CDK2/cyclin A (pCDK2/cyclin A) has been probed with stru ...

    Eukaryotic protein kinases catalyze the phosphoryl transfer of the gamma-phosphate of ATP to the serine, threonine, or tyrosine residue of protein substrates. The catalytic mechanism of phospho-CDK2/cyclin A (pCDK2/cyclin A) has been probed with structural and kinetic studies using the trigonal NO(3)(-) ion, which can be viewed as a mimic of the metaphosphate transition state. The crystal structure of pCDK2/cyclin A in complex with Mg(2+)ADP, nitrate, and a heptapeptide substrate has been determined at 2.7 A. The nitrate ion is located between the beta-phosphate of ADP and the hydroxyl group of the serine residue of the substrate. In one molecule of the asymmetric unit, the nitrate is close to the beta-phosphate of ADP (distance from the nitrate nitrogen to the nearest beta-phosphate oxygen of 2.5 A), while in the other subunit, the nitrate is closer to the substrate serine (distance of 2.1 A). Kinetic studies demonstrate that nitrate is not an effective inhibitor of protein kinases, consistent with the structural results that show the nitrate ion makes few stabilizing interactions with CDK2 at the catalytic site. The binding of orthovanadate was also investigated as a mimic of a pentavalent phosphorane intermediate of an associative mechanism for phosphoryl transfer. No vanadate was observed bound in a 3.4 A resolution structure of pCDK2/cyclin A in the presence of Mg(2+)ADP, and vanadate did not inhibit the kinase reaction. The results support the notion that the protein kinase reaction proceeds through a mostly dissociative mechanism with a trigonal planar metaphosphate intermediate rather than an associative mechanism that involves a pentavalent phosphorane intermediate.


    Related Citations: 
    • The Structural Basis for Specificity of Substrate and Recruitment Peptides Fo Cyclin-Dependent Kinases
      Brown, N.R.,Noble, M.E.M.,Endicott, J.A.,Johnson, L.N.
      (1999) Nat.Cell Biol. 1: 438


    Organizational Affiliation

    Laboratory of Molecular Biophysics, Department of Biochemistry, University of Oxford, Rex Richards Building, South Parks Road, Oxford OX1 3QU, U.K.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CELL DIVISION PROTEIN KINASE 2
A, C
299Homo sapiensGene Names: CDK2 (CDKN2)
EC: 2.7.11.22
Find proteins for P24941 (Homo sapiens)
Go to Gene View: CDK2
Go to UniProtKB:  P24941
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CYCLIN A2
B, D
258Homo sapiensGene Names: CCNA2 (CCN1, CCNA)
Find proteins for P20248 (Homo sapiens)
Go to Gene View: CCNA2
Go to UniProtKB:  P20248
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
SUBSTRATE PEPTIDE
E, F
7N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

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Download CCD File 
A, C
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
B, C
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NO3
Query on NO3

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Download CCD File 
A, C
NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
A, C
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.250 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 150.710α = 90.00
b = 164.100β = 90.00
c = 72.430γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
AMoREphasing
SCALAdata scaling
REFMACphasing
REFMACmodel building
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-04-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance