Experimental Data Snapshot

  • Resolution: 2.59 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.176 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.0 of the entry. See complete history


Combined Peptide and Small-Molecule Approach toward Nonacidic THIQ Inhibitors of the KEAP1/NRF2 Interaction.

Ontoria, J.M.Biancofiore, I.Fezzardi, P.Ferrigno, F.Torrente, E.Colarusso, S.Bianchi, E.Andreini, M.Patsilinakos, A.Kempf, G.Augustin, M.Steinbacher, S.Summa, V.Pacifici, R.Munoz-Sanjuan, I.Park, L.Bresciani, A.Dominguez, C.Sherman, L.T.Harper, S.

(2020) ACS Med Chem Lett 11: 740-746

  • DOI: https://doi.org/10.1021/acsmedchemlett.9b00594
  • Primary Citation of Related Structures:  
    6SP1, 6SP4

  • PubMed Abstract: 

    The NRF2-ARE pathway is an intrinsic mechanism of defense against oxidative stress. Inhibition of the interaction between NRF2 and its main negative regulator KEAP1 is an attractive strategy toward neuroprotective agents. We report here the identification of nonacidic tetrahydroisoquinolines (THIQs) that inhibit the KEAP1/NRF2 protein-protein interaction. Peptide SAR at one residue is utilized as a tool to probe structural changes within a specific pocket of the KEAP1 binding site. We used structural information from peptide screening at the P2 pocket, noncovalent small-molecules inhibitors, and the outcome from an explorative SAR at position 5 of THIQs to identify a series of neutral THIQ analogs that bind to KEAP1 in the low micromolar range. These analogs establish new H-bond interactions at the P3 and P2 pockets allowing the replacement of the carboxylic acid functionality by a neutral primary carboxamide. X-ray crystallographic studies reveal the novel binding mode of these molecules to KEAP1.

  • Organizational Affiliation

    IRBM S.p.A., Via Pontina km 30.600, 00071 Pomezia, Rome, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kelch-like ECH-associated protein 1
A, B, C, D, E
A, B, C, D, E, F
293Homo sapiensMutation(s): 0 
Gene Names: KEAP1INRF2KIAA0132KLHL19
UniProt & NIH Common Fund Data Resources
Find proteins for Q14145 (Homo sapiens)
Explore Q14145 
Go to UniProtKB:  Q14145
PHAROS:  Q14145
GTEx:  ENSG00000079999 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14145
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.59 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.176 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.452α = 90
b = 91.875β = 119.89
c = 112.313γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History