4YH3

Crystal structure of human BRD4(1) in complex with 4-[(2E)-3-(4-methoxyphenyl)-2-phenylprop-2-enoyl]-3,4-dihydroquinoxalin-2(1H)-one (compound 19a)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Discovery of a new chemical series of BRD4(1) inhibitors using protein-ligand docking and structure-guided design.

Duffy, B.C.Liu, S.Martin, G.S.Wang, R.Hsia, M.M.Zhao, H.Guo, C.Ellis, M.Quinn, J.F.Kharenko, O.A.Norek, K.Gesner, E.M.Young, P.R.McLure, K.G.Wagner, G.S.Lakshminarasimhan, D.White, A.Suto, R.K.Hansen, H.C.Kitchen, D.B.

(2015) Bioorg.Med.Chem.Lett. 25: 2818-2823

  • DOI: 10.1016/j.bmcl.2015.04.107
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bromodomains are key transcriptional regulators that are thought to be druggable epigenetic targets for cancer, inflammation, diabetes and cardiovascular therapeutics. Of particular importance is the first of two bromodomains in bromodomain containin ...

    Bromodomains are key transcriptional regulators that are thought to be druggable epigenetic targets for cancer, inflammation, diabetes and cardiovascular therapeutics. Of particular importance is the first of two bromodomains in bromodomain containing 4 protein (BRD4(1)). Protein-ligand docking in BRD4(1) was used to purchase a small, focused screening set of compounds possessing a large variety of core structures. Within this set, a small number of weak hits each contained a dihydroquinoxalinone ring system. We purchased other analogs with this ring system and further validated the new hit series and obtained improvement in binding inhibition. Limited exploration by new analog synthesis showed that the binding inhibition in a FRET assay could be improved to the low μM level making this new core a potential hit-to-lead series. Additionally, the predicted geometries of the initial hit and an improved analog were confirmed by X-ray co-crystallography with BRD4(1).


    Organizational Affiliation

    Albany Molecular Research (AMRI), 26 Corporate Circle, PO Box 15098, Albany, NY 12212-5098, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bromodomain-containing protein 4
A
129Homo sapiensMutation(s): 0 
Gene Names: BRD4 (HUNK1)
Find proteins for O60885 (Homo sapiens)
Go to Gene View: BRD4
Go to UniProtKB:  O60885
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Y80
Query on Y80

Download SDF File 
Download CCD File 
A
4-[(2E)-3-(4-methoxyphenyl)-2-phenylprop-2-enoyl]-3,4-dihydroquinoxalin-2(1H)-one
C24 H20 N2 O3
WQITZMVRSQPEBE-HMMYKYKNSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
Y80IC50: 26000 nM (99) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.160 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 37.936α = 90.00
b = 44.072β = 90.00
c = 78.161γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
HKL-2000data reduction
PDB_EXTRACTdata extraction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-01-13
    Type: Initial release
  • Version 1.1: 2017-11-22
    Type: Database references, Derived calculations, Refinement description