CDK2 in complex with staurosporine

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.196 

Starting Model: experimental
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Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


A Novel Approach to the Discovery of Small-Molecule Ligands of CDK2.

Martin, M.P.Alam, R.Betzi, S.Ingles, D.J.Zhu, J.Y.Schonbrunn, E.

(2012) Chembiochem 13: 2128-2136

  • DOI: https://doi.org/10.1002/cbic.201200316
  • Primary Citation of Related Structures:  
    3TI1, 3TIY, 3TIZ, 4ERW, 4EZ3, 4EZ7

  • PubMed Abstract: 

    In an attempt to identify novel small-molecule ligands of cyclin-dependent kinase 2 (CDK2) with potential as allosteric inhibitors, we have devised a robust and cost-effective fluorescence-based high-throughput screening assay. The assay is based on the specific interaction of CDK2 with the extrinsic fluorophore 8-anilino-1-naphthalene sulfonate (ANS), which binds to a large allosteric pocket adjacent to the ATP site. Hit compounds that displace ANS directly or indirectly from CDK2 are readily classified as ATP site binders or allosteric ligands through the use of staurosporine, which blocks the ATP site without displacing ANS. Pilot screening of 1453 compounds led to the discovery of 12 compounds with displacement activities (EC(50) values) ranging from 6 to 44 μM, all of which were classified as ATP-site-directed ligands. Four new type I inhibitor scaffolds were confirmed by X-ray crystallography. Although this small compound library contained only ATP-site-directed ligands, the application of this assay to large compound libraries has the potential to reveal previously unrecognized chemical scaffolds suitable for structure-based design of CDK2 inhibitors with new mechanisms of action.

  • Organizational Affiliation

    Drug Discovery Department, Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL 33612, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclin-dependent kinase 2306Homo sapiensMutation(s): 0 
Gene Names: CDK2CDKN2
UniProt & NIH Common Fund Data Resources
Find proteins for P24941 (Homo sapiens)
Explore P24941 
Go to UniProtKB:  P24941
GTEx:  ENSG00000123374 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP24941
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on STU

Download Ideal Coordinates CCD File 
C28 H26 N4 O3
Query on EDO

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A]
C2 H6 O2
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on OCS
Binding Affinity Annotations 
IDSourceBinding Affinity
STU PDBBind:  4ERW IC50: 7 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.63α = 90
b = 71.34β = 90
c = 72.36γ = 90
Software Package:
Software NamePurpose
StructureStudiodata collection
PHENIXmodel building
XDSdata reduction
XDSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-22
    Type: Initial release
  • Version 1.1: 2012-10-03
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.3: 2023-12-06
    Changes: Data collection