1OIR | pdb_00001oir

Imidazopyridines: a potent and selective class of Cyclin-dependent Kinase inhibitors identified through Structure-based hybridisation

• PDB DOI: https://doi.org/10.2210/pdb1OIR/pdb

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


• Deposited: 2003-06-24 Released: 2003-09-04 
• Deposition Author(s): Beattie, J.F., Breault, G.A., Byth, K.F., Culshaw, J.D., Ellston, R.P.A., Green, S., Minshull, C.A., Norman, R.A., Pauptit, R.A., Thomas, A.P., Jewsbury, P.J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.91 Å
• R-Value Free: 
  0.241 (Depositor), 0.407 (DCC) 
• R-Value Work: 
  0.204 (Depositor), 0.396 (DCC) 
• R-Value Observed: 
  0.205 (Depositor) 

Literature

Imidazo[1,2-A]Pyridines: A Potent and Selective Class of Cyclin-Dependent Kinase Inhibitors Identified Through Structure-Based Hybridisation

Anderson, M., Beattie, J.F., Breault, G.A., Breed, J., Byth, K.F., Culshaw, J.D., Ellston, R.P.A., Green, S., Minshull, C.A., Norman, R.A., Pauptit, R.A., Stanway, J., Thomas, A.P., Jewsbury, P.J.

(2003) Bioorg Med Chem Lett 13: 3021

• PubMed: 12941325 
• DOI: https://doi.org/10.1016/s0960-894x(03)00638-3
• Primary Citation Related Structures: 
  1OIQ, 1OIR, 1OIT


• PubMed Abstract: 
  

  High-throughput screening identified the imidazo[1,2-a]pyridine and bisanilinopyrimidine series as inhibitors of the cyclin-dependent kinase CDK4. Comparison of their experimentally-determined binding modes and emerging structure-activity trends led to the development of potent and selective imidazo[1,2-a]pyridine inhibitors for CDK4 and in particular CDK2.

---

Organizational Affiliation: 
• AstraZeneca, Alderley Park, Macclesfield, Cheshire SK10 4TG, UK.

Biological Assembly 1  

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: 2,439 
• Modeled Residue Count: 287 
• Deposited Residue Count: 299 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CELL DIVISION PROTEIN KINASE 2	A	299	Homo sapiens	Mutation(s): 0  EC: 2.7.1.37 (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

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HDY	B [auth A]	1-(DIMETHYLAMINO)-3-(4-{{4-(2-METHYLIMIDAZO[1,2-A]PYRIDIN-3-YL)PYRIMIDIN-2-YL]AMINO}PHENOXY)PROPAN-2-OL C23 H26 N6 O2 VCPXSBULBDYRLT-SFHVURJKSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
KCX	A	L-PEPTIDE LINKING	C7 H14 N2 O4		LYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.91 Å
• R-Value Free:  0.241 (Depositor), 0.407 (DCC) 
• R-Value Work:  0.204 (Depositor), 0.396 (DCC) 
• R-Value Observed: 0.205 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 53.529	α = 90
b = 72.239	β = 90
c = 72.137	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-09-04 
Deposition Author(s): Beattie, J.F., Breault, G.A., Byth, K.F., Culshaw, J.D., Ellston, R.P.A., Green, S., Minshull, C.A., Norman, R.A., Pauptit, R.A., Thomas, A.P., Jewsbury, P.J.

Revision History  

• Version 1.0: 2003-09-04
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2025-04-09
  Changes: Data collection, Database references, Derived calculations, Other, Structure summary