4LPZ

ARNT transcription factor/coactivator complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.247 

Starting Model: experimental
View more details

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: https://doi.org/10.1074/jbc.M114.632786
  • Primary Citation of Related Structures:  
    4LPZ, 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). 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aryl hydrocarbon receptor nuclear translocator
A, B
119Homo sapiensMutation(s): 0 
Gene Names: ARNTBHLHE2
UniProt & NIH Common Fund Data Resources
Find proteins for P27540 (Homo sapiens)
Explore P27540 
Go to UniProtKB:  P27540
PHAROS:  P27540
GTEx:  ENSG00000143437 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27540
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Transforming acidic coiled-coil-containing protein 3
C, D
44Mus musculusMutation(s): 0 
UniProt
Find proteins for Q9JJ11 (Mus musculus)
Explore Q9JJ11 
Go to UniProtKB:  Q9JJ11
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9JJ11
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.247 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.846α = 90
b = 59.816β = 97.85
c = 73.51γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
PHASERphasing
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-16
    Type: Initial release
  • Version 1.1: 2021-09-22
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Refinement description