3H7W

Crystal structure of the high affinity heterodimer of HIF2 alpha and ARNT C-terminal PAS domains with the artificial ligand THS017

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Principles of ligand binding within a completely buried cavity in HIF2alpha PAS-B

Key, J., Scheuermann, T.H., Anderson, P.C., Daggett, V., Gardner, K.H.

(2009) J Am Chem Soc 131: 17647-17654

  • DOI: 10.1021/ja9073062
  • Primary Citation of Related Structures:  
    3H7W, 3H82

  • PubMed Abstract: 

    • Hypoxia-inducible factors (HIFs) are heterodimeric transcription factors responsible for the metazoan hypoxia response and promote tumor growth, metastasis, and resistance to cancer treatment. The C-terminal Per-ARNT-Sim (PAS) domain of HIF2alpha (HIF2alpha PAS-B) contains a preformed solvent-inaccessible cavity that binds artificial ligands that allosterically perturb the formation of the HIF heterodimer ...

    Hypoxia-inducible factors (HIFs) are heterodimeric transcription factors responsible for the metazoan hypoxia response and promote tumor growth, metastasis, and resistance to cancer treatment. The C-terminal Per-ARNT-Sim (PAS) domain of HIF2alpha (HIF2alpha PAS-B) contains a preformed solvent-inaccessible cavity that binds artificial ligands that allosterically perturb the formation of the HIF heterodimer. To better understand how small molecules bind within this domain, we examined the structures and equilibrium and transition-state thermodynamics of HIF2alpha PAS-B with several artificial ligands using isothermal titration calorimetry, NMR exchange spectroscopy, and X-ray crystallography. Rapid association rates reveal that ligand binding is not dependent upon a slow conformational change in the protein to permit ligand access, despite the closed conformation observed in the NMR and crystal structures. Compensating enthalpic and entropic contributions to the thermodynamic barrier for ligand binding suggest a binding-competent transition state characterized by increased structural disorder. Finally, molecular dynamics simulations reveal conversion between open and closed conformations of the protein and pathways of ligand entry into the binding pocket.

    Organizational Affiliation: 

    Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8816, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Endothelial PAS domain-containing protein 1 A117Homo sapiensMutation(s): 1 
Gene Names: EPAS1, HIF2A, Hypoxia Inducible Factor 2 alpha, MOP2, BHLHE73, PASD2
Find proteins for Q99814 (Homo sapiens)
Explore Q99814 
Go to UniProtKB:  Q99814
NIH Common Fund Data Resources
PHAROS:  Q99814
GTEx:  ENSG00000116016
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Aryl hydrocarbon receptor nuclear translocator B121Homo sapiensMutation(s): 1 
Gene Names: ARNT, Aryl Hydrocarbon Receptor Nuclear Translocator, BHLHE2
Find proteins for P27540 (Homo sapiens)
Explore P27540 
Go to UniProtKB:  P27540
NIH Common Fund Data Resources
PHAROS:  P27540
GTEx:  ENSG00000143437
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
018
Query on 018
Download Ideal Coordinates CCD File 
A
2-nitro-N-(thiophen-3-ylmethyl)-4-(trifluoromethyl)aniline
C12 H9 F3 N2 O2 S
NGKHDSWSPXFWOE-UHFFFAOYSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
018Kd:  590   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.89α = 90
b = 82.727β = 106.48
c = 41.158γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
REFMACrefinement
HKL-3000data reduction
HKL-2000data scaling
REFMACphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-01-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance