Highly Potent and Selective 3-N-methylquinazoline-4(3H)-one Based Inhibitors of B-RafV600E Kinase

Experimental Data Snapshot

  • Resolution: 3.40 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 

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Highly potent and selective 3-N-methylquinazoline-4(3H)-one based inhibitors of B-Raf(V600E) kinase.

Wenglowsky, S.Ren, L.Grina, J.Hansen, J.D.Laird, E.R.Moreno, D.Dinkel, V.Gloor, S.L.Hastings, G.Rana, S.Rasor, K.Sturgis, H.L.Voegtli, W.C.Vigers, G.Willis, B.Mathieu, S.Rudolph, J.

(2014) Bioorg Med Chem Lett 24: 1923-1927

  • DOI: https://doi.org/10.1016/j.bmcl.2014.03.007
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Herein we describe the design of a novel series of ATP competitive B-Raf inhibitors via structure-based methods. These 3-N-methylquinazoline-4(3H)-one based inhibitors exhibit both excellent cellular potency and striking B-Raf selectivity. Optimization led to the identification of compound 16, a potent, selective and orally available agent with excellent pharmacokinetic properties and robust tumor growth inhibition in xenograft studies. Our work also demonstrates that by replacing an aryl amide with an aryl sulfonamide, a multikinase inhibitor such as AZ-628, can be converted to a selective B-Raf inhibitor, a finding that should have broad application in kinase drug discovery.

  • Organizational Affiliation

    Array BioPharma, Inc., 3200 Walnut Street, Boulder, CO 80301, United States. Electronic address: li.ren@arraybiopharma.com.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase B-raf
A, B
307Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P15056 (Homo sapiens)
Explore P15056 
Go to UniProtKB:  P15056
PHAROS:  P15056
GTEx:  ENSG00000157764 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15056
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 2VX

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C19 H20 F2 N4 O3 S
Binding Affinity Annotations 
IDSourceBinding Affinity
2VX BindingDB:  4PP7 IC50: min: 11, max: 62 (nM) from 2 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 3.40 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.971α = 90
b = 107.971β = 90
c = 151.669γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-09
    Type: Initial release
  • Version 1.1: 2014-05-07
    Changes: Database references