2CCI

Crystal structure of phospho-CDK2 Cyclin A in complex with a peptide containing both the substrate and recruitment sites of CDC6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.261 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The role of the phospho-CDK2/cyclin A recruitment site in substrate recognition.

Cheng, K.Y.Noble, M.E.Skamnaki, V.Brown, N.R.Lowe, E.D.Kontogiannis, L.Shen, K.Cole, P.A.Siligardi, G.Johnson, L.N.

(2006) J. Biol. Chem. 281: 23167-23179

  • DOI: 10.1074/jbc.M600480200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Phospho-CDK2/cyclin A, a kinase that is active in cell cycle S phase, contains an RXL substrate recognition site that is over 40 A from the catalytic site. The role of this recruitment site, which enhances substrate affinity and catalytic efficiency, ...

    Phospho-CDK2/cyclin A, a kinase that is active in cell cycle S phase, contains an RXL substrate recognition site that is over 40 A from the catalytic site. The role of this recruitment site, which enhances substrate affinity and catalytic efficiency, has been investigated using peptides derived from the natural substrates, namely CDC6 and p107, and a bispeptide inhibitor in which the gamma-phosphate of ATP is covalently attached by a linker to the CDC6 substrate peptide. X-ray studies with a 30-residue CDC6 peptide in complex with pCDK2/cyclin A showed binding of a dodecamer peptide at the recruitment site and a heptapeptide at the catalytic site, but no density for the linking 11 residues. Kinetic studies established that the CDC6 peptide had an 18-fold lower Km compared with heptapeptide substrate and that this effect required the recruitment peptide to be covalently linked to the substrate peptide. X-ray studies with the CDC6 bispeptide showed binding of the dodecamer at the recruitment site and the modified ATP in two alternative conformations at the catalytic site. The CDC6 bispeptide was a potent inhibitor competitive with both ATP and peptide substrate of pCDK2/cyclin A activity against a heptapeptide substrate (Ki = 0.83 nm) but less effective against RXL-containing substrates. We discuss how localization at the recruitment site (KD 0.4 microm) leads to increased catalytic efficiency and the design of a potent inhibitor. The notion of a flexible linker between the sites, which must have more than a minimal number of residues, provides an explanation for recognition and discrimination against different substrates.


    Organizational Affiliation

    Laboratory of Molecular Biophysics, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyclin-dependent kinase 2
A, C
299Homo sapiensMutation(s): 0 
Gene 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 sapiensMutation(s): 0 
Gene Names: CCNA2 (CCN1, CCNA)
Find proteins for P20248 (Homo sapiens)
Go to Gene View: CCNA2
Go to UniProtKB:  P20248
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Cell division control protein 6 homolog
F, I
30Homo sapiensMutation(s): 4 
Gene Names: CDC6 (CDC18L)
Find proteins for Q99741 (Homo sapiens)
Go to Gene View: CDC6
Go to UniProtKB:  Q99741
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

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

Download SDF File 
Download CCD File 
A, C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-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: 0.321 
  • R-Value Work: 0.261 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 74.420α = 90.00
b = 114.389β = 90.00
c = 170.709γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
MOLREPphasing
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-05-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2018-06-06
    Type: Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary