1XV9

crystal structure of CAR/RXR heterodimer bound with SRC1 peptide, fatty acid, and 5b-pregnane-3,20-dione.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.181 

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:  
    1XV9, 1XVP

  • 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
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Orphan nuclear receptor NR1I3BD246Homo sapiensMutation(s): 0 
Gene Names: NR1I3CAR
Find proteins for Q14994 (Homo sapiens)
Explore Q14994 
Go to UniProtKB:  Q14994
NIH Common Fund Data Resources
PHAROS  Q14994
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
nuclear receptor coactivator 1 isoform 1EFGH13Homo sapiensMutation(s): 0 
Gene Names: NCOA1BHLHE74SRC1
EC: 2.3.1.48
Find proteins for Q15788 (Homo sapiens)
Explore Q15788 
Go to UniProtKB:  Q15788
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PHAROS  Q15788
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Retinoic acid receptor RXR-alphaAC236Homo sapiensMutation(s): 0 
Gene Names: RXRANR2B1
Find proteins for P19793 (Homo sapiens)
Explore P19793 
Go to UniProtKB:  P19793
NIH Common Fund Data Resources
PHAROS  P19793
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CI2
Query on CI2

Download CCD File 
D
(5BETA)-PREGNANE-3,20-DIONE
C21 H32 O2
XMRPGKVKISIQBV-XWOJZHJZSA-N
 Ligand Interaction
F15
Query on F15

Download CCD File 
A, C
PENTADECANOIC ACID
C15 H30 O2
WQEPLUUGTLDZJY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.181 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.442α = 90
b = 128.442β = 90
c = 214.53γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-12-28
    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: 2016-11-30
    Changes: Other, Source and taxonomy