4KV1

Crystal Structure of Brd4 Bromodomain 1 in Complex with Acetylated Rel Peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 

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:  
    4KV1, 4KV4

  • 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 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 ...

    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

    1] Department of Biochemistry, College of Medicine, University of Illinois at Urbana-Champaign, Urbana, IL, USA [2] College of Medicine, University of Illinois at Urbana-Champaign, Urbana, IL, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bromodomain-containing protein 4A, C [auth B]128Homo sapiensMutation(s): 0 
Gene Names: BRD4HUNK1
Find proteins for O60885 (Homo sapiens)
Explore O60885 
Go to UniProtKB:  O60885
NIH Common Fund Data Resources
PHAROS:  O60885
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Rel peptideB [auth C], D7Homo sapiensMutation(s): 0 
Gene Names: RELANFKB3
Find proteins for Q04206 (Homo sapiens)
Explore Q04206 
Go to UniProtKB:  Q04206
NIH Common Fund Data Resources
PHAROS:  Q04206
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ALY
Query on ALY
B [auth C], DL-PEPTIDE LINKINGC8 H16 N2 O3LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.011α = 90
b = 59.733β = 90
c = 118.889γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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