4BJX

N-TERMINAL BROMODOMAIN OF HUMAN BRD4 WITH GSK1324726A (I-BET726)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.59 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Bet Inhibition Silences Expression of Mycn and Bcl2 and Induces Cytotoxicity in Neuroblastoma Tumor Models.

Wyce, A.Ganji, G.Smitheman, K.N.Chung, C.Korenchuk, S.Bai, Y.Barbash, O.Le, B.Craggs, P.D.Mccabe, M.T.Kennedy-Wilson, K.M.Sanchez, L.V.Gosmini, R.L.Parr, N.Mchugh, C.F.Dhanak, D.Prinjha, R.K.Auger, K.R.Tummino, P.J.

(2013) Plos One 8: 72967

  • DOI: 10.1371/journal.pone.0072967

  • PubMed Abstract: 
  • BET family proteins are epigenetic regulators known to control expression of genes involved in cell growth and oncogenesis. Selective inhibitors of BET proteins exhibit potent anti-proliferative activity in a number of hematologic cancer models, in p ...

    BET family proteins are epigenetic regulators known to control expression of genes involved in cell growth and oncogenesis. Selective inhibitors of BET proteins exhibit potent anti-proliferative activity in a number of hematologic cancer models, in part through suppression of the MYC oncogene and downstream Myc-driven pathways. However, little is currently known about the activity of BET inhibitors in solid tumor models, and whether down-regulation of MYC family genes contributes to sensitivity. Here we provide evidence for potent BET inhibitor activity in neuroblastoma, a pediatric solid tumor associated with a high frequency of MYCN amplifications. We treated a panel of neuroblastoma cell lines with a novel small molecule inhibitor of BET proteins, GSK1324726A (I-BET726), and observed potent growth inhibition and cytotoxicity in most cell lines irrespective of MYCN copy number or expression level. Gene expression analyses in neuroblastoma cell lines suggest a role of BET inhibition in apoptosis, signaling, and N-Myc-driven pathways, including the direct suppression of BCL2 and MYCN. Reversal of MYCN or BCL2 suppression reduces the potency of I-BET726-induced cytotoxicity in a cell line-specific manner; however, neither factor fully accounts for I-BET726 sensitivity. Oral administration of I-BET726 to mouse xenograft models of human neuroblastoma results in tumor growth inhibition and down-regulation MYCN and BCL2 expression, suggesting a potential role for these genes in tumor growth. Taken together, our data highlight the potential of BET inhibitors as novel therapeutics for neuroblastoma, and suggest that sensitivity is driven by pleiotropic effects on cell growth and apoptotic pathways in a context-specific manner.


    Organizational Affiliation

    Cancer Epigenetics Discovery Performance Unit, GlaxoSmithKline, Collegeville, Pennsylvania, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BROMODOMAIN-CONTAINING PROTEIN 4
A
153Homo 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
73B
Query on 73B

Download SDF File 
Download CCD File 
A
4-[(2S,4R)-1-acetyl-4-[(4-chlorophenyl)amino]-2-methyl-1,2,3,4-tetrahydroquinolin-6-yl]benzoic acid
C25 H23 Cl N2 O3
FAWSUKOIROHXAP-NPMXOYFQSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
73BKd: 4.4 - 23 nM (89) BINDINGDB
73BIC50: 0.4 - 501 nM (89) BINDINGDB
73BIC50: 22 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.59 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.157 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 44.780α = 90.00
b = 47.906β = 90.00
c = 58.757γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
REFMACrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-04-20 
  • Released Date: 2013-10-02 
  • Deposition Author(s): Chung, C.

Revision History 

  • Version 1.0: 2013-10-02
    Type: Initial release
  • Version 1.1: 2014-04-23
    Type: Database references, Source and taxonomy