4PKY

ARNT/HIF transcription factor/coactivator complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.233 

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
  • Primary Citation of Related Structures:  
    4PKY

  • 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 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) ...

    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 the Structural Biology Initiative, CUNY Advanced Science Research Center, and Department of Chemistry, City College of New York, New York, New York 10031 Kevin.Gardner@asrc.cuny.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aryl hydrocarbon receptor nuclear translocatorA, D121Homo sapiensMutation(s): 1 
Gene Names: ARNTBHLHE2
Find proteins for P27540 (Homo sapiens)
Explore P27540 
Go to UniProtKB:  P27540
NIH Common Fund Data Resources
PHAROS:  P27540
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Transforming acidic coiled-coil-containing protein 3B, C, E, F50Mus musculusMutation(s): 0 
Gene Names: Tacc3Aint
Find proteins for Q9JJ11 (Mus musculus)
Explore Q9JJ11 
Go to UniProtKB:  Q9JJ11
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Endothelial PAS domain-containing protein 1G117Homo sapiensMutation(s): 1 
Gene Names: EPAS1BHLHE73HIF2AMOP2PASD2
Find proteins for Q99814 (Homo sapiens)
Explore Q99814 
Go to UniProtKB:  Q99814
NIH Common Fund Data Resources
PHAROS:  Q99814
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
H [auth B], I [auth B]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.233 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.136α = 90
b = 96.136β = 90
c = 182.841γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
PDB_EXTRACTdata extraction
PHASERphasing
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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