Crystal Structure of Human KEAP1 BTB Domain in Complex with Small Molecule TX64063

Experimental Data Snapshot

  • Resolution: 2.37 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 

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Characterization of novel small-molecule NRF2 activators: Structural and biochemical validation of stereospecific KEAP1 binding.

Huerta, C.Jiang, X.Trevino, I.Bender, C.F.Ferguson, D.A.Probst, B.Swinger, K.K.Stoll, V.S.Thomas, P.J.Dulubova, I.Visnick, M.Wigley, W.C.

(2016) Biochim Biophys Acta 1860: 2537-2552

  • DOI: https://doi.org/10.1016/j.bbagen.2016.07.026
  • Primary Citation of Related Structures:  
    5DAD, 5DAF

  • PubMed Abstract: 

    Semi-synthetic oleanane triterpenoid antioxidant inflammation modulators (tpAIMs) are small molecules that interact with KEAP1 cysteine residue 151 (C151) and activate NRF2. Exploration of the structure-activity relationship between the tpAIMs and KEAP1 is limited by the predominantly hydrocarbon nature of the oleanane triterpenoid pentacyclic ring structure. Therefore, we used novel, chemically-tractable, synthetic antioxidant inflammation modulators (sAIMs) to probe the stereoselectivity of the ligand-protein interaction.

  • Organizational Affiliation

    Department of Research, Reata Pharmaceuticals, Inc., Irving, TX 75063, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kelch-like ECH-associated protein 1140Homo sapiensMutation(s): 0 
Gene Names: KEAP1INRF2KIAA0132KLHL19
UniProt & NIH Common Fund Data Resources
Find proteins for Q14145 (Homo sapiens)
Explore Q14145 
Go to UniProtKB:  Q14145
GTEx:  ENSG00000079999 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14145
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 58E

Download Ideal Coordinates CCD File 
B [auth A](5aS,6S,9aS)-7-hydroxy-2,6,9a-trimethyl-3-(pyridin-3-yl)-4,5,5a,6,9,9a-hexahydro-2H-benzo[g]indazole-8-carbonitrile
C20 H22 N4 O
Experimental Data & Validation

Experimental Data

  • Resolution: 2.37 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 
  • Space Group: P 31 1 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.449α = 90
b = 42.449β = 90
c = 134.044γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
XDSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-10
    Type: Initial release
  • Version 1.1: 2016-09-14
    Changes: Database references
  • Version 1.2: 2017-11-22
    Changes: Database references, Derived calculations, Refinement description