7C6P

Bromodomain-containing 4 BD2 in complex with 3',4',7,8- Tetrahydroxyflavonoid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.73 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.192 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in: 7C2Z


Literature

Discovery of the natural product 3',4',7,8-tetrahydroxyflavone as a novel and potent selective BRD4 bromodomain 2 inhibitor.

Li, J.Zou, W.Yu, K.Liu, B.Liang, W.Wang, L.Lu, Y.Jiang, Z.Wang, A.Zhu, J.

(2021) J Enzyme Inhib Med Chem 36: 903-913

  • DOI: https://doi.org/10.1080/14756366.2021.1906663
  • Primary Citation of Related Structures:  
    7C2Z, 7C6P

  • PubMed Abstract: 

    Bromodomain-containing protein 4 (BRD4) binds acetylated lysine residues on the N-terminal tails of histones through two bromodomains (BD1 and BD2) to regulate gene transcription. Inhibiting one or both of bromodomains resulted in different phenotypes, suggesting BD1 and BD2 may have different functions. Here we report the characterisation of a natural product 3',4',7,8-tetrahydroxyflavone as a novel and potent selective BRD4 inhibitor. The compound is 100-fold more selective for BRD4-BD2 (IC50 = 204 nM) than BRD4-BD1 (IC 50 =17.9 µM). Co-crystal structures show 3',4',7,8-tetrahydroxyflavone binds to the acetylated lysine binding pocket of BRD4-BD1 or BRD4-BD2, but establishes more interactions with BRD4-BD2 than BRD4-BD1. Our data suggest 3',4',7,8-tetrahydroxyflavone as a potent selective inhibitor of BRD4-BD2 with a novel chemical scaffold. Given its distinct chemical structure from current BRD4 inhibitors, this compound may open the door for a novel class of anti-BRD4 inhibitors by serving as a lead compound.


  • Organizational Affiliation

    School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Bromodomain-containing protein 4109Homo sapiensMutation(s): 0 
Gene Names: BRD4HUNK1
UniProt & NIH Common Fund Data Resources
Find proteins for O60885 (Homo sapiens)
Explore O60885 
Go to UniProtKB:  O60885
PHAROS:  O60885
GTEx:  ENSG00000141867 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO60885
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SQH (Subject of Investigation/LOI)
Query on SQH

Download Ideal Coordinates CCD File 
B [auth A]2-[3,4-bis(oxidanyl)phenyl]-7,8-bis(oxidanyl)chromen-4-one
C15 H10 O6
ARYCMKPCDNHQCL-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.73 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.192 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.59α = 90
b = 63.01β = 90
c = 70.5γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
iMOSFLMdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-12
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Database references, Refinement description