1OSH

A Chemical, Genetic, and Structural Analysis of the nuclear bile acid receptor FXR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A chemical, genetic, and structural analysis of the nuclear bile acid receptor FXR

Downes, M.Verdecia, M.A.Roecker, A.J.Hughes, R.Hogenesch, J.B.Kast-Woelbern, H.R.Bowman, M.E.Ferrer, J.-L.Anisfeld, A.M.Edwards, P.A.Rosenfeld, J.M.Alvarez, J.G.Noel, J.P.Nicolaou, K.C.Evans, R.M.

(2003) Mol.Cell 11: 1079-1092


  • PubMed Abstract: 
  • The farnesoid X receptor (FXR) functions as a bile acid (BA) sensor coordinating cholesterol metabolism, lipid homeostasis, and absorption of dietary fats and vitamins. However, BAs are poor reagents for characterizing FXR functions due to multiple r ...

    The farnesoid X receptor (FXR) functions as a bile acid (BA) sensor coordinating cholesterol metabolism, lipid homeostasis, and absorption of dietary fats and vitamins. However, BAs are poor reagents for characterizing FXR functions due to multiple receptor independent properties. Accordingly, using combinatorial chemistry we evolved a small molecule agonist termed fexaramine with 100-fold increased affinity relative to natural compounds. Gene-profiling experiments conducted in hepatocytes with FXR-specific fexaramine versus the primary BA chenodeoxycholic acid (CDCA) produced remarkably distinct genomic targets. Highly diffracting cocrystals (1.78 A) of fexaramine bound to the ligand binding domain of FXR revealed the agonist sequestered in a 726 A(3) hydrophobic cavity and suggest a mechanistic basis for the initial step in the BA signaling pathway. The discovery of fexaramine will allow us to unravel the FXR genetic network from the BA network and selectively manipulate components of the cholesterol pathway that may be useful in treating cholesterol-related human diseases.


    Organizational Affiliation

    Howard Hughes Medical Institute, Gene Expression Laboratory, 10010 North Torrey Pines Road, La Jolla, California 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bile acid receptor
A
232Homo sapiensGene Names: NR1H4 (BAR, FXR, HRR1, RIP14)
Find proteins for Q96RI1 (Homo sapiens)
Go to Gene View: NR1H4
Go to UniProtKB:  Q96RI1
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FEX
Query on FEX

Download SDF File 
Download CCD File 
A
METHYL 3-{3-[(CYCLOHEXYLCARBONYL){[4'-(DIMETHYLAMINO)BIPHENYL-4-YL]METHYL}AMINO]PHENYL}ACRYLATE
FEXARAMINE
C32 H38 N2 O3
GXGGBYHHVMOCJL-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.215 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 36.656α = 90.00
b = 56.776β = 90.00
c = 117.646γ = 90.00
Software Package:
Software NamePurpose
RESOLVEphasing
HKL-2000data reduction
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2003-09-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance