6X7D

BRD4 Bromodomain 1 in complex with multi-action inhibitor SF2523P


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.202 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Design of thienopyranone-based BET inhibitors that bind multiple synthetic lethality targets.

Vann, K.R.Pal, D.Morales, G.A.Burgoyne, A.M.Durden, D.L.Kutateladze, T.G.

(2020) Sci Rep 10: 12027-12027

  • DOI: https://doi.org/10.1038/s41598-020-68964-6
  • Primary Citation of Related Structures:  
    6X7B, 6X7C, 6X7D

  • PubMed Abstract: 

    Development of small molecule compounds that target several cancer drivers has shown great therapeutic potential. Here, we developed a new generation of highly potent thienopyranone (TP)-based inhibitors for the BET bromodomains (BDs) of the transcriptional regulator BRD4 that have the ability to simultaneously bind to phosphatidylinositol-3 kinase (PI3K) and/or cyclin-dependent kinases 4/6 (CDK4/6). Analysis of the crystal structures of the complexes, NMR titration experiments and IC 50 measurements reveal the molecular basis underlying the inhibitory effects and selectivity of these compounds toward BDs of BRD4. The inhibitors show robust cytotoxic effects in multiple cancer cell lines and induce cell-cycle arrest and apoptosis. We further demonstrate that concurrent disruption of the acetyllysine binding function of BRD4 and the kinase activities of PI3K and CDK4/6 by the TP inhibitor improves efficacy in several cancer models. Together, these findings provide further compelling evidence that these multi-action inhibitors are efficacious and more potent than single inhibitory chemotypes.


  • Organizational Affiliation

    Department of Pharmacology, University of Colorado School of Medicine, Aurora, CO, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Bromodomain-containing protein 4
A, B
133Homo 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
UT4 (Subject of Investigation/LOI)
Query on UT4

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
3-(2,3-dihydro-1,4-benzodioxin-6-yl)-5-(piperazin-1-yl)-7H-thieno[3,2-b]pyran-7-one
C19 H18 N2 O4 S
QRWUATIRJXRWLX-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
UT4 Binding MOAD:  6X7D IC50: 388 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.147α = 90
b = 39.832β = 106.45
c = 62.035γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-3000data reduction
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-05
    Type: Initial release
  • Version 1.1: 2023-10-18
    Changes: Data collection, Database references, Refinement description