1XNX

Crystal structure of constitutive androstane receptor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 

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This is version 1.3 of the entry. See complete history


Literature

Structure of the murine constitutive androstane receptor complexed to androstenol; a molecular basis for inverse agonism

Shan, L.Vincent, J.Brunzelle, J.S.Dussault, I.Lin, M.Ianculescu, I.Sherman, M.A.Forman, B.M.Fernandez, E.

(2004) Mol Cell 16: 907-917

  • DOI: 10.1016/j.molcel.2004.11.037
  • Primary Citation of Related Structures:  
    1XNX

  • PubMed Abstract: 
  • The nuclear receptor CAR is a xenobiotic responsive transcription factor that plays a central role in the clearance of drugs and bilirubin while promoting cocaine and acetaminophen toxicity. In addition, CAR has established a "reverse" paradigm of nuclear receptor action where the receptor is active in the absence of ligand and inactive when bound to inverse agonists ...

    The nuclear receptor CAR is a xenobiotic responsive transcription factor that plays a central role in the clearance of drugs and bilirubin while promoting cocaine and acetaminophen toxicity. In addition, CAR has established a "reverse" paradigm of nuclear receptor action where the receptor is active in the absence of ligand and inactive when bound to inverse agonists. We now report the crystal structure of murine CAR bound to the inverse agonist androstenol. Androstenol binds within the ligand binding pocket, but unlike many nuclear receptor ligands, it makes no contacts with helix H12/AF2. The transition from constitutive to basal activity (androstenol bound) appears to be associated with a ligand-induced kink between helices H10 and H11. This disrupts the previously predicted salt bridge that locks H12 in the transcriptionally active conformation. This mechanism of inverse agonism is distinct from traditional nuclear receptor antagonists thereby offering a new approach to receptor modulation.


    Organizational Affiliation

    Biochemistry, Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
constitutive androstane receptorA, B256Mus musculusMutation(s): 0 
Gene Names: Nr1i3Car
UniProt
Find proteins for O35627 (Mus musculus)
Explore O35627 
Go to UniProtKB:  O35627
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATE (Subject of Investigation/LOI)
Query on ATE

Download Ideal Coordinates CCD File 
C [auth A], D [auth B]16,17-ANDROSTENE-3-OL
C19 H30 O
KRVXMNNRSSQZJP-PHFHYRSDSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
ATE PDBBind:  1XNX Ki: 416 (nM) from 1 assay(s)
BindingDB:  1XNX IC50: 250 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.353α = 90
b = 155.042β = 90
c = 134.607γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
AMoREphasing
CNSrefinement

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

  • Deposited Date: 2004-10-05 
  • Released Date: 2005-01-04 
  • Deposition Author(s): Fernandez, E.

Revision History  (Full details and data files)

  • Version 1.0: 2005-01-04
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description