X-ray crystal structure of compound 2a bound to human CHK1 kinase domain

Experimental Data Snapshot

  • Resolution: 1.59 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.225 

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This is version 1.2 of the entry. See complete history


Design, synthesis and SAR of thienopyridines as potent CHK1 inhibitors.

Zhao, L.Zhang, Y.Dai, C.Guzi, T.Wiswell, D.Seghezzi, W.Parry, D.Fischmann, T.Siddiqui, M.A.

(2010) Bioorg Med Chem Lett 20: 7216-7221

  • DOI: https://doi.org/10.1016/j.bmcl.2010.10.105
  • Primary Citation of Related Structures:  
    3PA3, 3PA4, 3PA5

  • PubMed Abstract: 

    A novel series of CHK1 inhibitors based on thienopyridine template has been designed and synthesized. These inhibitors maintain critical hydrogen bonding with the hinge and conserved water in the ATP binding site. Several compounds show single digit nanomolar CHK1 activities. Compound 70 shows excellent enzymatic activity of 1 nM.

  • Organizational Affiliation

    Department of Chemistry, Merck Research Laboratories, Cambridge, MA 02141, USA. lianyun.zhao@merck.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Chk1273Homo sapiensMutation(s): 0 
Gene Names: CHEK1CHK1
UniProt & NIH Common Fund Data Resources
Find proteins for O14757 (Homo sapiens)
Explore O14757 
Go to UniProtKB:  O14757
PHAROS:  O14757
GTEx:  ENSG00000149554 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14757
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
C72 PDBBind:  3PA4 IC50: 3 (nM) from 1 assay(s)
BindingDB:  3PA4 IC50: 3 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.59 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.225 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.92α = 90
b = 65.85β = 94.93
c = 58.27γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-12-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Derived calculations