8F5Y

Crystal structure of pregnane X receptor ligand binding domain complexed with JQ1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.207 

Starting Model: experimental
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Literature

A bromodomain-independent mechanism of gene regulation by the BET inhibitor JQ1: direct activation of nuclear receptor PXR.

Huber, A.D.Poudel, S.Wu, J.Miller, D.J.Lin, W.Yang, L.Bwayi, M.N.Rimmer, M.A.Gee, R.R.F.Seetharaman, J.Chai, S.C.Chen, T.

(2024) Nucleic Acids Res 52: 1661-1676

  • DOI: https://doi.org/10.1093/nar/gkad1175
  • Primary Citation of Related Structures:  
    8F5Y

  • PubMed Abstract: 

    Bromodomain and extraterminal (BET) proteins are extensively studied in multiple pathologies, including cancer. BET proteins modulate transcription of various genes, including those synonymous with cancer, such as MYC. Thus, BET inhibitors are a major area of drug development efforts. (+)-JQ1 (JQ1) is the prototype inhibitor and is a common tool to probe BET functions. While showing therapeutic promise, JQ1 is not clinically usable, partly due to metabolic instability. Here, we show that JQ1 and the BET-inactive (-)-JQ1 are agonists of pregnane X receptor (PXR), a nuclear receptor that transcriptionally regulates genes encoding drug-metabolizing enzymes such as CYP3A4, which was previously shown to oxidize JQ1. A PXR-JQ1 co-crystal structure identified JQ1's tert-butyl moiety as a PXR anchor and explains binding by (-)-JQ1. Analogs differing at the tert-butyl lost PXR binding, validating our structural findings. Evaluation in liver cell models revealed both PXR-dependent and PXR-independent modulation of CYP3A4 expression by BET inhibitors. We have characterized a non-BET JQ1 target, a mechanism of physiological JQ1 instability, a biological function of (-)-JQ1, and BET-dependent transcriptional regulation of drug metabolism genes.


  • Organizational Affiliation

    Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear receptor subfamily 1 group I member 2
A, B
316Homo sapiensMutation(s): 0 
Gene Names: NR1I2PXR
UniProt & NIH Common Fund Data Resources
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 GroupO75469
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear receptor coactivator 1
C, D
25Homo sapiensMutation(s): 0 
EC: 2.3.1.48
UniProt & NIH Common Fund Data Resources
Find proteins for Q15788 (Homo sapiens)
Explore Q15788 
Go to UniProtKB:  Q15788
GTEx:  ENSG00000084676 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15788
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
JQ1 (Subject of Investigation/LOI)
Query on JQ1

Download Ideal Coordinates CCD File 
E [auth A],
F [auth B]
(6S)-6-(2-tert-butoxy-2-oxoethyl)-4-(4-chlorophenyl)-2,3,9-trimethyl-6,7-dihydrothieno[3,2-f][1,2,4]triazolo[4,3-a][1,4]diazepin-10-ium
C23 H26 Cl N4 O2 S
DNVXATUJJDPFDM-KRWDZBQOSA-O
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.207 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.547α = 90
b = 82.562β = 90
c = 103.669γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM118041

Revision History  (Full details and data files)

  • Version 1.0: 2024-02-21
    Type: Initial release
  • Version 1.1: 2024-03-06
    Changes: Database references