4XT2

Crystal structure of the high affinity heterodimer of HIF2 alpha and ARNT C-terminal PAS domains in complex with a tetrazole-containing antagonist

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 

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Literature

Isoform-Selective and Stereoselective Inhibition of Hypoxia Inducible Factor-2.

Scheuermann, T.H., Stroud, D., Sleet, C.E., Bayeh, L., Shokri, C., Wang, H., Caldwell, C.G., Longgood, J., MacMillan, J.B., Bruick, R.K., Gardner, K.H., Tambar, U.K.

(2015) J Med Chem 58: 5930-5941

  • DOI: 10.1021/acs.jmedchem.5b00529
  • Primary Citation of Related Structures:  
    4XT2

  • PubMed Abstract: 

    • Hypoxia inducible factor (HIF) transcription factors reside at the center of signaling pathways used by mammalian cells to sense and respond to low oxygen levels. While essential to maintain oxygen homeostasis, misregulation of HIF protein activity correlates with tumor development and metastasis ...

    Hypoxia inducible factor (HIF) transcription factors reside at the center of signaling pathways used by mammalian cells to sense and respond to low oxygen levels. While essential to maintain oxygen homeostasis, misregulation of HIF protein activity correlates with tumor development and metastasis. To provide artificial routes to target misregulated HIF activity, we identified small molecule antagonists of the HIF-2 transcription factor that bind an internal cavity within the C-terminal PAS domain of the HIF-2α subunit. Here we describe a new class of chiral small molecule ligands that provide the highest affinity binding, the most effective, isoform-selective inhibition of HIF-2 in cells, and trigger the largest protein conformation changes reported to date. The current results further illuminate the molecular mechanism of HIF-2 antagonism and suggest additional routes to develop higher affinity and potency HIF-2 antagonists.

    Organizational Affiliation: 

    ‡Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aryl hydrocarbon receptor nuclear translocatorA [auth B],
B [auth D]		121Homo sapiensMutation(s): 1 
Gene Names: ARNT, BHLHE2
UniProt & NIH Common Fund Data Resources
Find proteins for P27540 (Homo sapiens)
Explore P27540 
Go to UniProtKB:  P27540
PHAROS:  P27540
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27540
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Endothelial PAS domain-containing protein 1C [auth A],
D [auth C]		117Homo sapiensMutation(s): 1 
Gene Names: EPAS1, BHLHE73, HIF2A, MOP2, PASD2
UniProt & NIH Common Fund Data Resources
Find proteins for Q99814 (Homo sapiens)
Explore Q99814 
Go to UniProtKB:  Q99814
PHAROS:  Q99814
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99814
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
43L
Query on 43L
Download Ideal Coordinates CCD File 
E [auth A],
F [auth C]		(5S,7R)-5,7-bis(3-bromophenyl)-4,5,6,7-tetrahydrotetrazolo[1,5-a]pyrimidine
C16 H13 Br2 N5
JHRYBPMSBXHLJL-LSDHHAIUSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
43L BindingDB:  4XT2 Kd: min: 63, max: 70 (nM) from 2 assay(s)
IC50: min: 112, max: 3.00e+4 (nM) from 2 assay(s)
Binding MOAD:  4XT2 Kd: 63 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.253α = 90
b = 84.39β = 104.39
c = 82.784γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRP130513
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesP01 CA95471
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRP100846

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-09
    Type: Initial release
  • Version 1.1: 2015-12-23
    Changes: Refinement description
  • Version 1.2: 2017-09-06
    Changes: Advisory, Author supporting evidence, Derived calculations
  • Version 1.3: 2019-12-04
    Changes: Author supporting evidence