Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PQS (software)

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 129.57 kDa 
• Atom Count: 9201 
• Modelled Residue Count: 1113 
• Deposited Residue Count: 1133 
• Unique protein chains: 3

1H24

CDK2/CyclinA in complex with a 9 residue recruitment peptide from E2F

• PDB DOI: 10.2210/pdb1H24/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-07-31 Released: 2003-02-01 
• Deposition Author(s): Tews, I., Cheng, K.Y., Lowe, E.D., Noble, M.E.M., Brown, N.R., Gul, S., Gamblin, S., Johnson, L.N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.270 
• R-Value Work: 0.209 
• R-Value Observed: 0.212 

Literature

Specificity Determinants of Recruitment Peptides Bound to Phospho-Cdk2/Cyclin A

Lowe, E.D., Tews, I., Cheng, K.Y., Brown, N.R., Gul, S., Noble, M.E.M., Gamblin, S., Johnson, L.N.

(2002) Biochemistry 41: 15625

• PubMed: 12501191 
• DOI: 10.1021/bi0268910
• Primary Citation of Related Structures:  
  1H24, 1H25, 1H26, 1H27, 1H28


• PubMed Abstract: 
  

Progression through S phase of the eukaryotic cell cycle is regulated by the action of the cyclin dependent protein kinase 2 (CDK2) in association with cyclin A. CDK2/cyclin A phosphorylates numerous substrates. Substrate specificity often employs a dual recognition strategy in which the sequence flanking the phospho-acceptor site (Ser.Pro.X.Arg/Lys) is recognized by CDK2, while the cyclin A component of the complex contains a hydrophobic site that binds Arg/Lys.X.Leu ("RXL" or "KXL") substrate recruitment motifs. To determine additional sequence specificity motifs around the RXL sequence, we have performed X-ray crystallographic studies at 2.3 A resolution and isothermal calorimetry measurements on complexes of phospho-CDK2/cyclin A with a recruitment peptide derived from E2F1 and with shorter 11-mer peptides from p53, pRb, p27, E2F1, and p107. The results show that the cyclin recruitment site accommodates a second hydrophobic residue either immediately C-terminal or next adjacent to the leucine of the "RXL" motif and that this site makes important contributions to the recruitment peptide recognition. The arginine of the RXL motif contacts a glutamate, Glu220, on the cyclin. In those substrates that contain a KXL motif, no ionic interactions are observed with the lysine. The sequences N-terminal to the "RXL" motif of the individual peptides show no conservation, but nevertheless make common contacts to the cyclin through main chain interactions. Thus, the recruitment site is able to recognize diverse but conformationally constrained target sequences. The observations have implications for the further identification of physiological substrates of CDK2/cyclin A and the design of specific inhibitors.

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Related Citations: 

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

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Organizational Affiliation: 

Laboratory of Molecular Biophysics, University of Oxford, Rex Richards Building, Oxford OX1 3QU, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CELL DIVISION PROTEIN KINASE 2	A, C	303	Homo sapiens	Mutation(s): 0  Gene Names: CDK2, CDKN2 EC: 2.7.1 (PDB Primary Data), 2.7.11.22 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P24941 (Homo sapiens) Explore P24941  Go to UniProtKB:  P24941
PHAROS:  P24941 GTEx:  ENSG00000123374

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
CYCLIN A2	B, D	259	Homo sapiens	Mutation(s): 0  Gene Names: CCNA2, CCN1, CCNA
UniProt & NIH Common Fund Data Resources
Find proteins for P20248 (Homo sapiens) Explore P20248  Go to UniProtKB:  P20248
PHAROS:  P20248 GTEx:  ENSG00000145386

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
TRANSCRIPTION FACTOR E2F1	E	9	Homo sapiens	Mutation(s): 0  Gene Names: E2F1, RBBP3
UniProt & NIH Common Fund Data Resources
Find proteins for Q01094 (Homo sapiens) Explore Q01094  Go to UniProtKB:  Q01094
PHAROS:  Q01094 GTEx:  ENSG00000101412

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
TPO	A, C	L-PEPTIDE LINKING	C4 H10 N O6 P		THR

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.270 
• R-Value Work: 0.209 
• R-Value Observed: 0.212 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 73.551	α = 90
b = 133.549	β = 90
c = 147.89	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-07-31 
• Released Date: 2003-02-01 
Deposition Author(s): Tews, I., Cheng, K.Y., Lowe, E.D., Noble, M.E.M., Brown, N.R., Gul, S., Gamblin, S., Johnson, L.N.

Revision History  

• Version 1.0: 2003-02-01
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance