2YER

Synthesis and evaluation of triazolones as checkpoint kinase 1 inhibitors


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.147 

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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:  
    2YER, 2YEX

  • 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 further described herein ...

    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
UniProt & NIH Common Fund Data Resources
Find proteins for O14757 (Homo sapiens)
Explore O14757 
Go to UniProtKB:  O14757
PHAROS:  O14757
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
TQ1 BindingDB:  2YER IC50: 20 (nM) from 1 assay(s)
Binding MOAD:  2YER IC50: 20 (nM) from 1 assay(s)
PDBBind:  2YER IC50: 20 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.147 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.16α = 90
b = 69.92β = 90
c = 103.5γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-14
    Type: Initial release
  • Version 1.1: 2018-04-04
    Changes: Data collection