1GY3

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.250 

Starting Model: experimental
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This is version 2.2 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

  • DOI: https://doi.org/10.1021/bi0201724
  • Primary Citation of Related Structures:  
    1GY3

  • 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 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.


  • Organizational Affiliation

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


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CELL DIVISION PROTEIN KINASE 2
A, C
299Homo sapiensMutation(s): 0 
EC: 2.7.11.22
UniProt & NIH Common Fund Data Resources
Find proteins for P24941 (Homo sapiens)
Explore P24941 
Go to UniProtKB:  P24941
PHAROS:  P24941
GTEx:  ENSG00000123374 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP24941
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CYCLIN A2
B, D
258Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P20248 (Homo sapiens)
Explore P20248 
Go to UniProtKB:  P20248
PHAROS:  P20248
GTEx:  ENSG00000145386 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20248
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
SUBSTRATE PEPTIDE
E, F
7synthetic constructMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
G [auth A],
L [auth C]
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
GOL
Query on GOL

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J [auth B],
K [auth C]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
NO3
Query on NO3

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I [auth A],
N [auth C]
NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
MG
Query on MG

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H [auth A],
M [auth C]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
TPO
Query on TPO
A, C
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.250 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 150.71α = 90
b = 164.1β = 90
c = 72.43γ = 90
Software Package:
Software NamePurpose
REFMACmodel building
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing
REFMACphasing
REFMACrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-04-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 2.0: 2019-05-15
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Experimental preparation, Other
  • Version 2.1: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 2.2: 2024-10-23
    Changes: Structure summary