Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 34.46 kDa 
• Atom Count: 2406 
• Residue Count: 275 
• Unique protein chains: 1

1URW

CDK2 IN COMPLEX WITH AN IMIDAZO[1,2-b]PYRIDAZINE

• DOI: 10.2210/pdb1URW/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2003-11-11 Released: 2004-04-23 
• Deposition Author(s): Byth, K.F., Cooper, N., Culshaw, J.D., Heaton, D.W., Oakes, S.E., Minshull, C.A., Norman, R.A., Pauptit, R.A., Tucker, J.A., Breed, J., Pannifer, A., Rowsell, S., Stanway, J.J., Valentine, A.L., Thomas, A.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.253 
• R-Value Work: 0.220 

Literature

Imidazo[1,2-B]Pyridazines: A Potent and Selective Class of Cyclin-Dependent Kinase Inhibitors

Byth, K.F., Cooper, N., Culshaw, J.D., Heaton, D.W., Oakes, S.E., Minshull, C.A., Norman, R.A., Pauptit, R.A., Tucker, J.A., Breed, J., Pannifer, A., Rowsell, S., Stanway, J.J., Valentine, A.L., Thomas, A.P.

(2004) Bioorg Med Chem Lett 14: 2249

• PubMed: 15081018 
• DOI: 10.1016/j.bmcl.2004.02.008
• Primary Citation of Related Structures:  
  1URW


• PubMed Abstract: 
  

Modification of imidazo[1,2-a]pyridine CDK inhibitors lead to identification of less lipophilic imidazo[1,2-b]pyridazine series of CDK inhibitors. Although several equivalent compounds from these two series have similar structure and show similar CDK activity, the SAR of the two series differs significantly. Protein inhibitor structure determination has confirmed differences in binding mode and given some understanding of these differences in SAR. Potent and selective imidazo[1,2-b]pyridazine inhibitors of CDK2 have been identified, which show >1 microM plasma levels following a 2mg/kg oral dose to mice.

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Related Citations: 

• High-Resolution Crystal Structures of Human Cyclin-Dependent Kinase 2 with and without ATP: Bound Waters and Natural Ligand as a Guide for Inhibitor Design
  Schulze-Gahmen, U., De Bondt, H., Kim, S.-H.
  (1996) J Med Chem 39: 4540

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Organizational Affiliation: 

Cancer Research, AstraZeneca, Alderley Park, Macclesfield, Cheshire SK10 4TG, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CELL DIVISION PROTEIN KINASE 2	A	299	Homo sapiens	Mutation(s): 0  Gene Names: CDK2, CDKN2 EC: 2.7.1.37 (PDB Primary Data), 2.7.11.22 (UniProt)
Find proteins for P24941 (Homo sapiens) Explore P24941  Go to UniProtKB:  P24941
NIH Common Fund Data Resources
PHAROS:  P24941 GTEx:  ENSG00000123374

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
I1P	A	2-[4-(N-(3-DIMETHYLAMINOPROPYL)SULPHAMOYL)ANILINO]- C21 H24 N8 O2 S BBZUBCUIVIEBCP-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
I1P	IC50:  3   nM  BindingDB
I1P	IC50:  3   nM  Binding MOAD
I1P	IC50 :  3   nM  PDBBind

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.253 
• R-Value Work: 0.220 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.169	α = 90
b = 72.876	β = 90
c = 73.351	γ = 90

Software Package:

Software Name	Purpose
CNX	refinement
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-11-11 
• Released Date: 2004-04-23 
Deposition Author(s): Byth, K.F., Cooper, N., Culshaw, J.D., Heaton, D.W., Oakes, S.E., Minshull, C.A., Norman, R.A., Pauptit, R.A., Tucker, J.A., Breed, J., Pannifer, A., Rowsell, S., Stanway, J.J., Valentine, A.L., Thomas, A.P.

Revision History 

• Version 1.0: 2004-04-23
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance