Biological Assembly 1  

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

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

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

Macromolecule Content

• Total Structure Weight: 37.51 kDa 
• Atom Count: 2297 
• Modelled Residue Count: 284 
• Deposited Residue Count: 329 
• Unique protein chains: 1

2WTC

CRYSTAL STRUCTURE OF CHK2 IN COMPLEX WITH AN INHIBITOR

• PDB DOI: 10.2210/pdb2WTC/pdb

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


• Deposited: 2009-09-15 Released: 2009-12-29 
• Deposition Author(s): Hilton, S., Naud, S., Caldwell, J.J., Boxall, K., Burns, S., Anderson, V.E., Antoni, L., Allen, C.E., Pearl, L.H., Oliver, A.W., Aherne, G.W., Garrett, M.D., Collins, I.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.237 
• R-Value Work: 0.180 
• R-Value Observed: 0.183 

Literature

Identification and Characterisation of 2-Aminopyridine Inhibitors of Checkpoint Kinase 2

Hilton, S., Naud, S., Caldwell, J.J., Boxall, K., Burns, S., Anderson, V.E., Antoni, L., Allen, C.E., Pearl, L.H., Oliver, A.W., Aherne, G.W., Garrett, M.D., Collins, I.

(2010) Bioorg Med Chem 18: 707

• PubMed: 20022510 
• DOI: 10.1016/j.bmc.2009.11.058
• Primary Citation of Related Structures:  
  2WTC, 2WTD, 2WTI, 2WTJ


• PubMed Abstract: 
  

5-(Hetero)aryl-3-(4-carboxamidophenyl)-2-aminopyridine inhibitors of CHK2 were identified from high throughput screening of a kinase-focussed compound library. Rapid exploration of the hits through straightforward chemistry established structure-activity relationships and a proposed ATP-competitive binding mode which was verified by X-ray crystallography of several analogues bound to CHK2. Variation of the 5-(hetero)aryl substituent identified bicyclic dioxolane and dioxane groups which improved the affinity and the selectivity of the compounds for CHK2 versus CHK1. The 3-(4-carboxamidophenyl) substituent could be successfully replaced by acyclic omega-aminoalkylamides, which made additional polar interactions within the binding site and led to more potent inhibitors of CHK2. Compounds from this series showed activity in cell-based mechanistic assays for inhibition of CHK2.

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Organizational Affiliation: 

Cancer Research UK Centre for Cancer Therapeutics, The Institute of Cancer Research, 15 Cotswold Road, Sutton, Surrey SM2 5NG, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SERINE/THREONINE-PROTEIN KINASE CHK2	A	329	Homo sapiens	Mutation(s): 0  Gene Names: CHEK2, CDS1, CHK2, RAD53 EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for O96017 (Homo sapiens) Explore O96017  Go to UniProtKB:  O96017
PHAROS:  O96017

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
VGM	B [auth A]	4-[2-AMINO-5-(4-HYDROXY-3-METHOXYPHENYL)PYRIDIN-3-YL]BENZAMIDE C19 H17 N3 O3 MGGHBVJICDPMQM-UHFFFAOYSA-N
NO3	C [auth A]	NITRATE ION N O3 NHNBFGGVMKEFGY-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
VGM	BindingDB:  2WTC	IC50: 310 (nM) from 1 assay(s)
	PDBBind:  2WTC	IC50: 310 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.237 
• R-Value Work: 0.180 
• R-Value Observed: 0.183 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 90.82	α = 90
b = 90.82	β = 90
c = 92.54	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-09-15 
• Released Date: 2009-12-29 
Deposition Author(s): Hilton, S., Naud, S., Caldwell, J.J., Boxall, K., Burns, S., Anderson, V.E., Antoni, L., Allen, C.E., Pearl, L.H., Oliver, A.W., Aherne, G.W., Garrett, M.D., Collins, I.

Revision History  

• Version 1.0: 2009-12-29
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance