2YEX

Synthesis and evaluation of triazolones as checkpoint kinase 1 inhibitors


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.164 
  • R-Value Work: 0.134 
  • R-Value Observed: 0.135 

wwPDB Validation   3D Report Full Report



Literature

Synthesis and Evaluation of Triazolones as Checkpoint Kinase 1 Inhibitors.

Oza, V.Ashwell, S.Brassil, P.Breed, J.Ezhuthachan, J.Deng, C.Grondine, M.Horn, C.Liu, D.Lyne, P.Newcombe, N.Pass, M.Read, J.Su, M.Toader, D.Yu, D.Yu, Y.Zabludoff, S.

(2012) Bioorg Med Chem Lett 22: 2330

  • DOI: 10.1016/j.bmcl.2012.01.043
  • Primary Citation of Related Structures:  
    2YEX, 2YER

  • PubMed Abstract: 
  • Checkpoint kinase 1 (Chk1, CHEK1) is a Ser/Thr protein kinase that plays a key role in mediating the cellular response to DNA-damage. Synthesis and evaluation of a previously described class of Chk1 inhibitors, triazoloquinolones/triazolones (TZs) is ...

    Checkpoint kinase 1 (Chk1, CHEK1) is a Ser/Thr protein kinase that plays a key role in mediating the cellular response to DNA-damage. Synthesis and evaluation of a previously described class of Chk1 inhibitors, triazoloquinolones/triazolones (TZs) is further described herein. Our investigation of structure-activity relationships led to the identification of potent inhibitors 14c, 14h and 16e. Key challenges included modulation of physicochemical properties and pharmacokinetic (PK) parameters to enable compound testing in a Chk1 specific hollow fiber pharmacodynamic model. In this model, 16e was shown to abrogate topotecan-induced cell cycle arrest in a dose dependent manner. The demonstrated activity of TZs in this model in combination with a chemotherapeutic agent as well as radiotherapy validates this series of Chk1 inhibitors. X-ray crystal structures (PDB code: 2YEX and 2YER) for an initial lead and an optimized analog are also presented.


    Related Citations: 
    • Discovery of a Novel Class of Triazolones as Checkpoint Kinase Inhibitors--Hit to Lead Exploration.
      Oza, V., Ashwell, S., Brassil, P., Breed, J., Deng, C., Ezhuthachan, J., Haye, H., Horn, C., Janetka, J., Lyne, P., Newcombe, N., Otterbien, L., Pass, M., Read, J., Roswell, S., Su, M., Toader, D., Yu, D., Yu, Y., Valentine, A., Webborn, P., White, A., Zabludoff, S., Zheng, X.
      (2010) Bioorg Med Chem Lett 20: 5133

    Organizational Affiliation

    AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, MA 02451, USA. Vibha.Oza@astrazeneca.com



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SERINE/THREONINE-PROTEIN KINASE CHK1A276Homo sapiensMutation(s): 0 
Gene Names: CHEK1CHK1
EC: 2.7.11.1
Find proteins for O14757 (Homo sapiens)
Explore O14757 
Go to UniProtKB:  O14757
NIH Common Fund Data Resources
PHAROS  O14757
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
YEX
Query on YEX

Download CCD File 
A
5-METHYL-8-(1H-PYRROL-2-YL)[1,2,4]TRIAZOLO[4,3-A]QUINOLIN-1(2H)-ONE
C15 H12 N4 O
XHMYMTXQNURDOQ-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
YEXIC50:  0.09999999403953552   nM  Binding MOAD
YEXIC50 :  0.10000000149011612   nM  PDBBind
YEXIC50:  0.10000000149011612   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.164 
  • R-Value Work: 0.134 
  • R-Value Observed: 0.135 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.352α = 90
b = 70.77β = 90
c = 104.327γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-14
    Type: Initial release