Crystal structure of C-MET kinase domain in complex with 4-((6-(4- fluorophenyl)-(1,2,4)triazolo(4,3-b)(1,2,4)triazin-3-yl)methyl)phenol

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.191 

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Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


Discovery of a Novel Class of Exquisitely Selective Mesenchymal-Epithelial Transition Factor (C-met) Protein Kinase Inhibitors and Identification of the Clinical Candidate 2-(4-(1-(Quinolin-6-Ylmethyl)-1H-[1,2, 3]Triazolo[4,5-B]Pyrazin-6-Yl)-1H-Pyrazol-1-Yl)Ethanol (Pf-04217903) for the Treatment of Cancer.

Cui, J.J.Mctigue, M.Nambu, M.Tran-Dube, M.Pairish, M.Shen, H.Jia, L.Cheng, H.Hoffman, J.Le, P.Jalaie, M.Goetz, G.H.Ryan, K.Grodsky, N.Deng, Y.Parker, M.Timofeevski, S.Murray, B.W.Yamazaki, S.Aguirre, S.Li, Q.Zou, H.Christensen, J.

(2012) J Med Chem 55: 8091

  • DOI: https://doi.org/10.1021/jm300967g
  • Primary Citation of Related Structures:  
    3ZXZ, 3ZZE, 4AOI, 4AP7

  • PubMed Abstract: 

    The c-MET receptor tyrosine kinase is an attractive oncology target because of its critical role in human oncogenesis and tumor progression. An oxindole hydrazide hit 6 was identified during a c-MET HTS campaign and subsequently demonstrated to have an unusual degree of selectivity against a broad array of other kinases. The cocrystal structure of the related oxindole hydrazide c-MET inhibitor 10 with a nonphosphorylated c-MET kinase domain revealed a unique binding mode associated with the exquisite selectivity profile. The chemically labile oxindole hydrazide scaffold was replaced with a chemically and metabolically stable triazolopyrazine scaffold using structure based drug design. Medicinal chemistry lead optimization produced 2-(4-(1-(quinolin-6-ylmethyl)-1H-[1,2,3]triazolo[4,5-b]pyrazin-6-yl)-1H-pyrazol-1-yl)ethanol (2, PF-04217903), an extremely potent and exquisitely selective c-MET inhibitor. 2 demonstrated effective tumor growth inhibition in c-MET dependent tumor models with good oral PK properties and an acceptable safety profile in preclinical studies. 2 progressed to clinical evaluation in a Phase I oncology setting.

  • Organizational Affiliation

    La Jolla Laboratories, Pfizer Worldwide Research and Development, 10770 Science Center Drive, San Diego, California 92121, USA. jean.cui@pfizer.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UniProt & NIH Common Fund Data Resources
Find proteins for P08581 (Homo sapiens)
Explore P08581 
Go to UniProtKB:  P08581
PHAROS:  P08581
GTEx:  ENSG00000105976 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08581
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on F47

Download Ideal Coordinates CCD File 
B [auth A]4-[[6-(4-fluorophenyl)-[1,2,4]triazolo[4,3-b][1,2,4]triazin-3-yl]methyl]phenol
C17 H12 F N5 O
Binding Affinity Annotations 
IDSourceBinding Affinity
F47 PDBBind:  4AP7 Ki: 11 (nM) from 1 assay(s)
BindingDB:  4AP7 Ki: min: 11, max: 60 (nM) from 2 assay(s)
IC50: min: 7, max: 32 (nM) from 2 assay(s)
Binding MOAD:  4AP7 Ki: 11 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.191 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.708α = 90
b = 93.387β = 90
c = 46.37γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-09-26
    Type: Initial release
  • Version 1.1: 2012-10-10
    Changes: Database references
  • Version 1.2: 2019-05-08
    Changes: Data collection, Experimental preparation, Other
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other