4PKY

ARNT/HIF transcription factor/coactivator complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Coiled-coil Coactivators Play a Structural Role Mediating Interactions in Hypoxia-inducible Factor Heterodimerization.

Guo, Y.Scheuermann, T.H.Partch, C.L.Tomchick, D.R.Gardner, K.H.

(2015) J.Biol.Chem. 290: 7707-7721

  • DOI: 10.1074/jbc.M114.632786

  • PubMed Abstract: 
  • The hypoxia-inducible factor complex (HIF-α·aryl hydrocarbon receptor nuclear translocator (ARNT)) requires association with several transcription coactivators for a successful cellular response to hypoxic stress. In addition to the conventional glob ...

    The hypoxia-inducible factor complex (HIF-α·aryl hydrocarbon receptor nuclear translocator (ARNT)) requires association with several transcription coactivators for a successful cellular response to hypoxic stress. In addition to the conventional global transcription coactivator CREB-binding protein/p300 (CBP/p300) that binds to the HIF-α transactivation domain, a new group of transcription coactivators called the coiled-coil coactivators (CCCs) interact directly with the second PER-ARNT-SIM (PAS) domain of ARNT (ARNT PAS-B). These less studied transcription coactivators play essential roles in the HIF-dependent hypoxia response, and CCC misregulation is associated with several forms of cancer. To better understand CCC protein recruitment by the heterodimeric HIF transcription factor, we used x-ray crystallography, NMR spectroscopy, and biochemical methods to investigate the structure of the ARNT PAS-B domain in complex with the C-terminal fragment of a coiled-coil coactivator protein, transforming acidic coiled-coil coactivator 3 (TACC3). We found that the HIF-2α PAS-B domain also directly interacts with TACC3, motivating an NMR data-derived model suggesting a means by which TACC3 could form a ternary complex with HIF-2α PAS-B and ARNT PAS-B via β-sheet/coiled-coil interactions. These findings suggest that TACC3 could be recruited as a bridge to cooperatively mediate between the HIF-2α PAS-B·ARNT PAS-B complex, thereby participating more directly in HIF-dependent gene transcription than previously anticipated.


    Organizational Affiliation

    From the Departments of Biophysics and Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390-8816 and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aryl hydrocarbon receptor nuclear translocator
A, D
121Homo sapiensMutation(s): 1 
Gene Names: ARNT (BHLHE2)
Find proteins for P27540 (Homo sapiens)
Go to Gene View: ARNT
Go to UniProtKB:  P27540
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Transforming acidic coiled-coil-containing protein 3
B, C, E, F
50Mus musculusMutation(s): 0 
Gene Names: Tacc3 (Aint)
Find proteins for Q9JJ11 (Mus musculus)
Go to UniProtKB:  Q9JJ11
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Endothelial PAS domain-containing protein 1
G
117Homo sapiensMutation(s): 1 
Gene Names: EPAS1 (BHLHE73, HIF2A, MOP2, PASD2)
Find proteins for Q99814 (Homo sapiens)
Go to Gene View: EPAS1
Go to UniProtKB:  Q99814
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.231 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 96.136α = 90.00
b = 96.136β = 90.00
c = 182.841γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
PHASERphasing
HKL-2000data reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-11
    Type: Initial release
  • Version 1.1: 2015-04-01
    Type: Database references
  • Version 1.2: 2017-11-22
    Type: Database references, Derived calculations, Other, Refinement description, Source and taxonomy