PXR in complex with P2X4 inhibitor compound 25

Experimental Data Snapshot

  • Resolution: 2.22 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 

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Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


Discovery and Characterization of the Potent and Selective P2X4 InhibitorN-[4-(3-Chlorophenoxy)-3-sulfamoylphenyl]-2-phenylacetamide (BAY-1797) and Structure-Guided Amelioration of Its CYP3A4 Induction Profile.

Werner, S.Mesch, S.Hillig, R.C.Ter Laak, A.Klint, J.Neagoe, I.Laux-Biehlmann, A.Dahllof, H.Brauer, N.Puetter, V.Nubbemeyer, R.Schulz, S.Bairlein, M.Zollner, T.M.Steinmeyer, A.

(2019) J Med Chem 62: 11194-11217

  • DOI: https://doi.org/10.1021/acs.jmedchem.9b01304
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The P2X4 receptor is a ligand-gated ion channel that is expressed on a variety of cell types, especially those involved in inflammatory and immune processes. High-throughput screening led to a new class of P2X4 inhibitors with substantial CYP 3A4 induction in human hepatocytes. A structure-guided optimization with respect to decreased pregnane X receptor (PXR) binding was started. It was found that the introduction of larger and more polar substituents on the ether linker led to less PXR binding while maintaining the P2X4 inhibitory potency. This translated into significantly reduced CYP 3A4 induction for compounds 71 and 73 . Unfortunately, the in vivo pharmacokinetic (PK) profiles of these compounds were insufficient for the desired profile in humans. However, BAY-1797 ( 10 ) was identified and characterized as a potent and selective P2X4 antagonist. This compound is suitable for in vivo studies in rodents, and the anti-inflammatory and anti-nociceptive effects of BAY-1797 were demonstrated in a mouse complete Freund's adjuvant (CFA) inflammatory pain model.

  • Organizational Affiliation

    Bayer AG, Research & Development, Pharmaceuticals , 13353 Berlin , Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear receptor subfamily 1 group I member 2,Nuclear receptor coactivator 1
A, B
344Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q15788 (Homo sapiens)
Explore Q15788 
Go to UniProtKB:  Q15788
GTEx:  ENSG00000084676 
Find proteins for O75469 (Homo sapiens)
Explore O75469 
Go to UniProtKB:  O75469
GTEx:  ENSG00000144852 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ15788O75469
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
GRH Binding MOAD:  6HTY IC50: 1242 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.22 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.417α = 90
b = 88.616β = 90
c = 104.929γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-04
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description