1OT7

Structural Basis for 3-deoxy-CDCA Binding and Activation of FXR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis for Bile Acid Binding and Activation of the Nuclear Receptor FXR

Mi, L.Z.Devarakonda, S.Harp, J.M.Han, Q.Pellicciari, R.Willson, T.M.Khorasanizadeh, S.Rastinejad, F.

(2003) Mol.Cell 11: 1093-1100

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The nuclear receptor FXR is the sensor of physiological levels of enterohepatic bile acids, the end products of cholesterol catabolism. Here we report crystal structures of the FXR ligand binding domain in complex with coactivator peptide and two dif ...

    The nuclear receptor FXR is the sensor of physiological levels of enterohepatic bile acids, the end products of cholesterol catabolism. Here we report crystal structures of the FXR ligand binding domain in complex with coactivator peptide and two different bile acids. An unusual A/B ring juncture, a feature associated with bile acids and no other steroids, provides ligand discrimination and triggers a pi-cation switch that activates FXR. Helix 12, the activation function 2 of the receptor, adopts the agonist conformation and stabilizes coactivator peptide binding. FXR is able to interact simultaneously with two coactivator motifs, providing a mechanism for enhanced binding of coactivators through intermolecular contacts between their LXXLL sequences. These FXR complexes provide direct insights into the design of therapeutic bile acids for treatment of hyperlipidemia and cholestasis.


    Organizational Affiliation

    Department of Pharmacology, University of Virginia Health System, Charlottesville 22908, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bile Acid Receptor
A, B
229Rattus norvegicusMutation(s): 0 
Gene Names: Nr1h4 (Bar, Fxr, Rip14)
Find proteins for Q62735 (Rattus norvegicus)
Go to UniProtKB:  Q62735
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
dodecamer peptide fragment of RPGR-interacting protein 1
C, D, E
12N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CHC
Query on CHC

Download SDF File 
Download CCD File 
A
6-ETHYL-CHENODEOXYCHOLIC ACID
C26 H44 O4
ZXERDUOLZKYMJM-ZWECCWDJSA-N
 Ligand Interaction
IU5
Query on IU5

Download SDF File 
Download CCD File 
B
ISO-URSODEOXYCHOLIC ACID
C24 H40 O4
RUDATBOHQWOJDD-DNMBCGTGSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CHCEC50: 85 - 99000 nM (94) BINDINGDB
IU5EC50: >50000 nM (94) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.233 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 99.536α = 90.00
b = 107.129β = 90.00
c = 69.203γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
HKL-2000data reduction
HKL-2000data collection
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-03-23
    Type: Initial release
  • Version 1.1: 2008-04-02
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance