TAS-120 covalent complex with FGFR1

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.244 

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This is version 1.3 of the entry. See complete history


TAS-120 Cancer Target Binding: Defining Reactivity and Revealing the First Fibroblast Growth Factor Receptor 1 (FGFR1) Irreversible Structure.

Kalyukina, M.Yosaatmadja, Y.Middleditch, M.J.Patterson, A.V.Smaill, J.B.Squire, C.J.

(2019) ChemMedChem 14: 494-500

  • DOI: https://doi.org/10.1002/cmdc.201800719
  • Primary Citation of Related Structures:  
    6MZQ, 6MZW

  • PubMed Abstract: 

    1-[(3S)-3-[4-Amino-3-[2-(3,5-dimethoxyphenyl)ethynyl]-1H-pyrazolo[3,4-d]pyrimidin-1-yl]-1-pyrrolidinyl]-2-propen-1-one (TAS-120) is an irreversible inhibitor of the fibroblast growth factor receptor (FGFR) family, and is currently under phase I/II clinical trials in patients with confirmed advanced metastatic solid tumours harbouring FGFR aberrations. This inhibitor specifically targets the P-loop of the FGFR tyrosine kinase domain, forming a covalent adduct with a cysteine side chain of the protein. Our mass spectrometry experiments characterise an exceptionally fast chemical reaction in forming the covalent complex. The structural basis of this reactivity is revealed by a sequence of three X-ray crystal structures: a free ligand structure, a reversible FGFR1 structure, and the first reported irreversible FGFR1 adduct structure. We hypothesise that the most significant reactivity feature of TAS-120 is its inherent ability to undertake conformational sampling of the FGFR P-loop. In designing novel covalent FGFR inhibitors, such a phenomenon presents an attractive strategy requiring appropriate positioning of an acrylamide group similarly to that of TAS-120.

  • Organizational Affiliation

    School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fibroblast growth factor receptor 1
A, B
311Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P11362 (Homo sapiens)
Explore P11362 
Go to UniProtKB:  P11362
PHAROS:  P11362
GTEx:  ENSG00000077782 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11362
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on TZ0

Download Ideal Coordinates CCD File 
C [auth A],
E [auth B]
C22 H22 N6 O3
Query on SO4

Download Ideal Coordinates CCD File 
O4 S
Binding Affinity Annotations 
IDSourceBinding Affinity
TZ0 BindingDB:  6MZW IC50: min: 1.1, max: 190 (nM) from 5 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.244 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 208.919α = 90
b = 48.981β = 106.19
c = 65.119γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-16
    Type: Initial release
  • Version 1.1: 2019-01-30
    Changes: Data collection, Database references
  • Version 1.2: 2019-03-06
    Changes: Data collection, Database references
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description