3EOC

Cdk2/CyclinA complexed with a imidazo triazin-2-amine

• PDB DOI: https://doi.org/10.2210/pdb3EOC/pdb

• Classification: TRANSFERASE/CELL CYCLE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda, Escherichia coli
• Mutation(s): No 


• Deposited: 2008-09-26 Released: 2008-11-04 
• Deposition Author(s): Cheung, M., Kuntz, K., Pobanz, M., Salovich, J., Wilson, B., Andrews, W., Shewchuk, L., Epperly, A., Hassler, D., Leesnitzer, M., Smith, J., Smith, G., Lansing, T., Mook, R.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.238 
• R-Value Work: 0.215 
• R-Value Observed: 0.216 

Starting Model: experimental

Literature

Imidazo[5,1-f][1,2,4]triazin-2-amines as novel inhibitors of polo-like kinase 1.

Cheung, M., Kuntz, K.W., Pobanz, M., Salovich, J.M., Wilson, B.J., Andrews, C.W., Shewchuk, L.M., Epperly, A.H., Hassler, D.F., Leesnitzer, M.A., Smith, J.L., Smith, G.K., Lansing, T.J., Mook, R.A.

(2008) Bioorg Med Chem Lett 18: 6214-6217

• PubMed: 18929484 
• DOI: https://doi.org/10.1016/j.bmcl.2008.09.100
• Primary Citation of Related Structures:  
  3EOC


• PubMed Abstract: 
  

  The synthesis and biological activities of imidazo[5,1-f][1,2,4]triazin-2-amines (imidazotriazines) as novel polo-like kinase 1 inhibitors are reported.

---

Organizational Affiliation: 

GlaxoSmithKline, Fire Moore Drive, Research Triangle Park, NC 27709, USA. [e-mail]

Biological Assembly 1  

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

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

Biological Assembly 2  

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

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

Macromolecule Content

• Total Structure Weight: 128.47 kDa 
• Atom Count: 8,772 
• Modelled Residue Count: 1,102 
• Deposited Residue Count: 1,116 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cell division protein kinase 2	A, C	298	Homo sapiens	Mutation(s): 0  Gene Names: CDK2 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 ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Cyclin-A2	B, D	260	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

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
T2A	E [auth A], F [auth C]	5-methyl-7-phenyl-N-(3,4,5-trimethoxyphenyl)imidazo[5,1-f][1,2,4]triazin-2-amine C21 H21 N5 O3 HOOQLZPFGONGJY-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
T2A	PDBBind:  3EOC	IC50: 230 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.238 
• R-Value Work: 0.215 
• R-Value Observed: 0.216 
• Space Group: P 6₂ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 182.977	α = 90
b = 182.977	β = 90
c = 213.687	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
CNS	refinement
DENZO	data reduction
HKL-2000	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-11-04 
Deposition Author(s): Cheung, M., Kuntz, K., Pobanz, M., Salovich, J., Wilson, B., Andrews, W., Shewchuk, L., Epperly, A., Hassler, D., Leesnitzer, M., Smith, J., Smith, G., Lansing, T., Mook, R.

Revision History  

• Version 1.0: 2008-11-04
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Refinement description, Version format compliance
• Version 1.2: 2017-10-25
  Changes: Refinement description
• Version 1.3: 2019-07-24
  Changes: Data collection, Refinement description
• Version 1.4: 2023-09-06
  Changes: Data collection, Database references, Derived calculations, Refinement description