2QHN

Crystal Structure of Chek1 in Complex with Inhibitor 1a

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Optimization of a pyrazoloquinolinone class of Chk1 kinase inhibitors.

Brnardic, E.J., Garbaccio, R.M., Fraley, M.E., Tasber, E.S., Steen, J.T., Arrington, K.L., Dudkin, V.Y., Hartman, G.D., Stirdivant, S.M., Drakas, B.A., Rickert, K., Walsh, E.S., Hamilton, K., Buser, C.A., Hardwick, J., Tao, W., Beck, S.C., Mao, X., Lobell, R.B., Sepp-Lorenzino, L., Yan, Y., Ikuta, M., Munshi, S.K., Kuo, L.C., Kreatsoulas, C.

(2007) Bioorg Med Chem Lett 17: 5989-5994

  • DOI: 10.1016/j.bmcl.2007.07.051
  • Primary Citation of Related Structures:  
    2QHN, 2QHM

  • PubMed Abstract: 

    • The development of 2,5-dihydro-4H-pyrazolo[4,3-c]quinolin-4-ones as inhibitors of Chk1 kinase is described. Introduction of a fused ring at the C7/C8 positions of the pyrazoloquinolinone provided an increase in potency while guidance from overlapping inh ...

    The development of 2,5-dihydro-4H-pyrazolo[4,3-c]quinolin-4-ones as inhibitors of Chk1 kinase is described. Introduction of a fused ring at the C7/C8 positions of the pyrazoloquinolinone provided an increase in potency while guidance from overlapping inhibitor bound Chk1 X-ray crystal structures contributed to the discovery of a potent and solubilizing propyl amine moiety in compound 52 (Chk1 IC(50)=3.1 nM).

    Organizational Affiliation: 

    Department of Medicinal Chemistry, Merck Research Laboratories, West Point, PA 19486, USA. edward_brnardic@merck.com



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Chk1 A323Homo sapiensMutation(s): 0 
Gene Names: CHEK1, CHK1
EC: 2.7.11.1
Find proteins for O14757 (Homo sapiens)
Explore O14757 
Go to UniProtKB:  O14757
NIH Common Fund Data Resources
PHAROS:  O14757
GTEx:  ENSG00000149554
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
582
Query on 582
Download Ideal Coordinates CCD File 
A
5-ETHYL-3-METHYL-1,5-DIHYDRO-4H-PYRAZOLO[4,3-C]QUINOLIN-4-ONE
C13 H13 N3 O
ASEHARDUZDZEKS-UHFFFAOYSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
582IC50:  980   nM  Binding MOAD
582IC50 :  980   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.14α = 90
b = 65.68β = 94.55
c = 58.23γ = 90
Software Package:
Software NamePurpose
BUSTER-TNTrefinement
CrystalCleardata collection
d*TREKdata reduction
d*TREKdata scaling
CNSphasing

Structure Validation

View Full Validation Report


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2007-07-02 
  • Released Date: 2008-03-18 
    • Deposition Author(s): Yan, Y., Munshi, S.

Revision History 

  • Version 1.0: 2008-03-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance