3H82

Crystal structure of the high affinity heterodimer of HIF2 alpha and ARNT C-terminal PAS domains with the artificial ligand THS020


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.194 

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:  

  • 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 (HI ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aryl hydrocarbon receptor nuclear translocator
B
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
Endothelial PAS domain-containing protein 1
A
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
020
Query on 020

Download SDF File 
Download CCD File 
A
N-(furan-2-ylmethyl)-2-nitro-4-(trifluoromethyl)aniline
C12 H9 F3 N2 O3
RLLQMCBJNDRXGR-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
020Kd: 1500 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.194 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 40.889α = 90.00
b = 70.280β = 108.68
c = 42.348γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data collection
HKL-3000data reduction
REFMACrefinement
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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