1XVP

crystal structure of CAR/RXR heterodimer bound with SRC1 peptide, fatty acid and CITCO


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

A Structural Basis for Constitutive Activity in the Human CAR/RXRalpha Heterodimer.

Xu, R.X.Lambert, M.H.Wisely, B.B.Warren, E.N.Weinert, E.E.Waitt, G.M.Williams, J.D.Collins, J.L.Moore, L.B.Willson, T.M.Moore, J.T.

(2004) Mol.Cell 16: 919-928

  • DOI: 10.1016/j.molcel.2004.11.042
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The X-ray crystal structure of the human constitutive androstane receptor (CAR, NR1I3)/retinoid X receptor alpha (RXRalpha, NR2B1) heterodimer sheds light on the mechanism of ligand-independent activation of transcription by nuclear receptors. CAR co ...

    The X-ray crystal structure of the human constitutive androstane receptor (CAR, NR1I3)/retinoid X receptor alpha (RXRalpha, NR2B1) heterodimer sheds light on the mechanism of ligand-independent activation of transcription by nuclear receptors. CAR contains a single-turn Helix X that restricts the conformational freedom of the C-terminal AF2 helix, favoring the active state of the receptor. Helix X and AF2 sit atop four amino acids that shield the CAR ligand binding pocket. A fatty acid ligand was identified in the RXRalpha binding pocket. The endogenous RXRalpha ligand, combined with stabilizing interactions from the heterodimer interface, served to hold RXRalpha in an active conformation. The structure suggests that upon translocation, CAR/RXRalpha heterodimers are preorganized in an active conformation in cells such that they can regulate transcription of target genes. Insights into the molecular basis of CAR constitutive activity can be exploited in the design of inverse agonists as drugs for treatment of obesity.


    Organizational Affiliation

    Discovery Research, GlaxoSmithKline, Research Triangle Park, NC 27709, USA. robert.x.xu@gsk.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Retinoic acid receptor RXR-alpha
A, C
236Homo sapiensMutation(s): 0 
Gene Names: RXRA (NR2B1)
Find proteins for P19793 (Homo sapiens)
Go to Gene View: RXRA
Go to UniProtKB:  P19793
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Orphan nuclear receptor NR1I3
B, D
246Homo sapiensMutation(s): 0 
Gene Names: NR1I3 (CAR)
Find proteins for Q14994 (Homo sapiens)
Go to Gene View: NR1I3
Go to UniProtKB:  Q14994
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
nuclear receptor coactivator 1 isoform 1
E, F, G, H
13Homo sapiensMutation(s): 0 
Gene Names: NCOA1 (BHLHE74, SRC1)
EC: 2.3.1.48
Find proteins for Q15788 (Homo sapiens)
Go to Gene View: NCOA1
Go to UniProtKB:  Q15788
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CID
Query on CID

Download SDF File 
Download CCD File 
D
6-(4-CHLOROPHENYL)IMIDAZO[2,1-B][1,3]THIAZOLE-5-CARBALDEHYDE O-(3,4-DICHLOROBENZYL)OXIME
C19 H12 Cl3 N3 O S
ZQWBOKJVVYNKTL-AUEPDCJTSA-N
 Ligand Interaction
F15
Query on F15

Download SDF File 
Download CCD File 
A, C
PENTADECANOIC ACID
C15 H30 O2
WQEPLUUGTLDZJY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CIDEC50: 20 - 510 nM (98) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.180 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 128.020α = 90.00
b = 128.020β = 90.00
c = 212.175γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data collection
CNSphasing
SCALEPACKdata scaling
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-12-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2016-11-30
    Type: Other, Source and taxonomy