4KV4

Brd4 Bromodomain 2 in Complex with Acetylated Rel Peptide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

Brd4 maintains constitutively active NF-kappa B in cancer cells by binding to acetylated RelA.

Zou, Z., Huang, B., Wu, X., Zhang, H., Qi, J., Bradner, J., Nair, S., Chen, L.F.

(2014) Oncogene 33: 2395-2404

  • DOI: 10.1038/onc.2013.179
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Acetylation of the RelA subunit of NF-κB at lysine-310 regulates the transcriptional activation of NF-κB target genes and contributes to maintaining constitutively active NF-κB in tumors. Bromodomain-containing factor Brd4 has been shown to bind to a ...

    Acetylation of the RelA subunit of NF-κB at lysine-310 regulates the transcriptional activation of NF-κB target genes and contributes to maintaining constitutively active NF-κB in tumors. Bromodomain-containing factor Brd4 has been shown to bind to acetylated lysine-310 (AcLys310) and to regulate the transcriptional activity of NF-κB, but the role of this binding in maintaining constitutively active NF-κB in tumors remains elusive. In this study, we demonstrate the structural basis for the binding of bromodomains (BDs) of bromodomain-containing protein 4 (Brd4) to AcLys310 and identify the BD inhibitor JQ1 as an effective small molecule to block this interaction. JQ1 suppresses TNF-α-mediated NF-κB activation and NF-κB-dependent target gene expression. In addition, JQ1 inhibits the proliferation and transformation potential of A549 lung cancer cells and suppresses the tumorigenicity of A549 cells in severe combined immunodeficiency mice. Furthermore, we demonstrate that depletion of Brd4 or treatment of cells with JQ1 induces the ubiquitination and degradation of the constitutively active nuclear form of RelA. Our results identify a novel function of Brd4 in maintaining the persistently active form of NF-κB found in tumors, and they suggest that interference with the interaction between acetylated RelA and Brd4 could be a potential therapeutic approach for the treatment of NF-κB-driven cancer.

    Organizational Affiliation: 

    Department of Biochemistry, College of Medicine, University of Illinois at Urbana-Champaign, Urbana, IL, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bromodomain-containing protein 4
A
111Homo sapiensMutation(s): 0 
Gene Names: BRD4 (HUNK1)
Find proteins for O60885 (Homo sapiens)
Go to Gene View: BRD4
Go to UniProtKB:  O60885
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Rel Peptide
B
7Homo sapiensMutation(s): 0 
Gene Names: RELA (NFKB3)
Find proteins for Q04206 (Homo sapiens)
Go to Gene View: RELA
Go to UniProtKB:  Q04206
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DTT
Query on DTT
Download SDF File 
Download CCD File 
A
2,3-DIHYDROXY-1,4-DITHIOBUTANE
1,4-DITHIOTHREITOL
C4 H10 O2 S2
VHJLVAABSRFDPM-IMJSIDKUSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ALY
Query on ALY
B
L-PEPTIDE LINKINGC8 H16 N2 O3LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 57.026α = 90.00
b = 73.599β = 90.00
c = 33.626γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PHENIXrefinement
MAR345dtbdata collection
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2013-05-22 
  • Released Date: 2013-06-26 
  • Deposition Author(s): Zhang, H., Nair, S.K.

Revision History 

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2014-02-26
    Type: Database references
  • Version 1.2: 2014-05-14
    Type: Database references