Crystal Structure of CHK1 with an Indol Inhibitor

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • R-Value Free: 0.314 
  • R-Value Work: 0.209 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Synthesis and biological evaluation of 3-ethylidene-1,3-dihydro-indol-2-ones as novel checkpoint 1 inhibitors

Lin, N.-H.Xia, P.Kovar, P.Park, C.Chen, Z.Zhang, H.Rosenberg, S.H.Sham, H.L.

(2006) Bioorg Med Chem Lett 16: 421-426

  • DOI: https://doi.org/10.1016/j.bmcl.2005.09.064
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Chk1 inhibitors have emerged as a novel class of neoplastic agents for abrogating the G2 DNA damage checkpoint arrest. Analogs of the Chk1 inhibitor, 3-ethylidene-1,3-dihydro-indol-2-one, were synthesized and tested in vitro for their inhibitory activities. The most promising compound identified from this series is analog 28, which possesses potent enzymatic and cellular activities.

  • Organizational Affiliation

    Cancer Research, R-47B, Global Pharmaceutical Products Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064-3500, USA. nanhorng.lin@abbott.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Chk1269Homo sapiensMutation(s): 0 
Gene Names: CHEK1CHK1
UniProt & NIH Common Fund Data Resources
Find proteins for O14757 (Homo sapiens)
Explore O14757 
Go to UniProtKB:  O14757
GTEx:  ENSG00000149554 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14757
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 43A

Download Ideal Coordinates CCD File 
C20 H16 N2 O3
Binding Affinity Annotations 
IDSourceBinding Affinity
43A BindingDB:  2AYP Ki: 32 (nM) from 1 assay(s)
IC50: 7 (nM) from 1 assay(s)
PDBBind:  2AYP IC50: 7 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • R-Value Free: 0.314 
  • R-Value Work: 0.209 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.043α = 90
b = 65.698β = 94.39
c = 57.86γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-12
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations