2QHN

Crystal Structure of Chek1 in Complex with Inhibitor 1a


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 

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:  

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase Chk1
A
323Homo sapiensMutation(s): 0 
Gene Names: CHEK1 (CHK1)
EC: 2.7.11.1
Find proteins for O14757 (Homo sapiens)
Go to Gene View: CHEK1
Go to UniProtKB:  O14757
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
582
Query on 582

Download SDF File 
Download 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 BINDINGMOAD
582IC50: 980 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 45.140α = 90.00
b = 65.680β = 94.55
c = 58.230γ = 90.00
Software Package:
Software NamePurpose
BUSTER-TNTrefinement
d*TREKdata scaling
CrystalCleardata collection
d*TREKdata reduction
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



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
    Type: Version format compliance