3JVK

Crystal structure of bromodomain 1 of mouse Brd4 in complex with histone H3-K(ac)14

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.200 

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Literature

Structures of the Dual Bromodomains of the P-TEFb-activating Protein Brd4 at Atomic Resolution

Vollmuth, F., Blankenfeldt, W., Geyer, M.

(2009) J Biol Chem 284: 36547-36556

  • DOI: 10.1074/jbc.M109.033712
  • Primary Citation of Related Structures:  
    3JVJ, 3JVK, 3JVL, 3JVM

  • PubMed Abstract: 

    • Brd4 is a member of the bromodomains and extra terminal domain (BET) family of proteins that recognize acetylated chromatin structures through their bromodomains and act as transcriptional activators. Brd4 functions as an associated factor and positive regulator of P-TEFb, a Cdk9-cyclin T heterodimer that stimulates transcriptional elongation by RNA polymerase II ...

    Brd4 is a member of the bromodomains and extra terminal domain (BET) family of proteins that recognize acetylated chromatin structures through their bromodomains and act as transcriptional activators. Brd4 functions as an associated factor and positive regulator of P-TEFb, a Cdk9-cyclin T heterodimer that stimulates transcriptional elongation by RNA polymerase II. Here, the crystal structures of the two bromodomains of Brd4 (BD1 and BD2) were determined at 1.5 and 1.2 A resolution, respectively. Complex formation of BD1 with a histone H3 tail polypeptide encompassing residues 12-19 showed binding of the Nzeta-acetylated lysine 14 to the conserved asparagine 140 of Brd4. In contrast, in BD2 the N-terminal linker sequence was found to interact with the binding site for acetylated lysines of the adjacent molecule to form continuous strings in the crystal lattice. This assembly shows for the first time a different binding ligand than acetylated lysine indicating that also other sequence compositions may be able to form similar interaction networks. Isothermal titration calorimetry revealed best binding of BD1 to H3 and of BD2 to H4 acetylated lysine sequences, suggesting alternating histone recognition specificities. Intriguingly, an acetylated lysine motif from cyclin T1 bound similarly well to BD2. Whereas the structure of Brd2 BD1 suggested its dimer formation, both Brd4 bromodomains appeared monomeric in solution as shown by size exclusion chromatography and mutational analyses.

    Organizational Affiliation: 

    Abteilung Physikalische Biochemie, Max-Planck-Institut für Molekulare Physiologie, Otto-Hahn-Strasse 11, D-44227 Dortmund, Germany.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bromodomain-containing protein 4A131Mus musculusMutation(s): 0 
Gene Names: Brd4, Mcap
Find proteins for Q9ESU6 (Mus musculus)
Explore Q9ESU6 
Go to UniProtKB:  Q9ESU6
NIH Common Fund Data Resources
IMPC  MGI:1888520
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
histone H3.3 peptideC8N/AMutation(s): 0 
Find proteins for P84243 (Homo sapiens)
Explore P84243 
Go to UniProtKB:  P84243
NIH Common Fund Data Resources
PHAROS  P84243
GTEx  ENSG00000163041
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO
Download Ideal Coordinates CCD File 
A
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ALY
Query on ALY		CL-PEPTIDE LINKINGC8 H16 N2 O3LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.131α = 90
b = 47.03β = 90
c = 77.25γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
XDSdata reduction
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-10-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance