Experimental Data Snapshot

  • Resolution: 2.13 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

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Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


Discovery of Roblitinib (FGF401) as a Reversible-Covalent Inhibitor of the Kinase Activity of Fibroblast Growth Factor Receptor 4.

Fairhurst, R.A.Knoepfel, T.Buschmann, N.Leblanc, C.Mah, R.Todorov, M.Nimsgern, P.Ripoche, S.Niklaus, M.Warin, N.Luu, V.H.Madoerin, M.Wirth, J.Graus-Porta, D.Weiss, A.Kiffe, M.Wartmann, M.Kinyamu-Akunda, J.Sterker, D.Stamm, C.Adler, F.Buhles, A.Schadt, H.Couttet, P.Blank, J.Galuba, I.Trappe, J.Voshol, J.Ostermann, N.Zou, C.Berghausen, J.Del Rio Espinola, A.Jahnke, W.Furet, P.

(2020) J Med Chem 63: 12542-12573

  • DOI: https://doi.org/10.1021/acs.jmedchem.0c01019
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    FGF19 signaling through the FGFR4/β-klotho receptor complex has been shown to be a key driver of growth and survival in a subset of hepatocellular carcinomas, making selective FGFR4 inhibition an attractive treatment opportunity. A kinome-wide sequence alignment highlighted a poorly conserved cysteine residue within the FGFR4 ATP-binding site at position 552, two positions beyond the gate-keeper residue. Several strategies for targeting this cysteine to identify FGFR4 selective inhibitor starting points are summarized which made use of both rational and unbiased screening approaches. The optimization of a 2-formylquinoline amide hit series is described in which the aldehyde makes a hemithioacetal reversible-covalent interaction with cysteine 552. Key challenges addressed during the optimization are improving the FGFR4 potency, metabolic stability, and solubility leading ultimately to the highly selective first-in-class clinical candidate roblitinib.

  • Organizational Affiliation

    Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fibroblast growth factor receptor 4
A, B
307Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P22455 (Homo sapiens)
Explore P22455 
Go to UniProtKB:  P22455
PHAROS:  P22455
GTEx:  ENSG00000160867 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22455
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.13 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 183.707α = 90
b = 67.198β = 90
c = 53.114γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-30
    Type: Initial release
  • Version 1.1: 2020-11-25
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description, Structure summary