1G1U

THE 2.5 ANGSTROM RESOLUTION CRYSTAL STRUCTURE OF THE RXRALPHA LIGAND BINDING DOMAIN IN TETRAMER IN THE ABSENCE OF LIGAND


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for autorepression of retinoid X receptor by tetramer formation and the AF-2 helix.

Gampe Jr., R.T.Montana, V.G.Lambert, M.H.Wisely, G.B.Milburn, M.V.Xu, H.E.

(2000) Genes Dev. 14: 2229-2241

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The 9-cis-retinoic acid receptors (RXRalpha, RXRbeta, and RXRgamma) are nuclear receptors that play key roles in multiple hormone-signaling pathways. Biochemical data indicate that, in the absence of ligand, RXR can exist as an inactive tetramer and ...

    The 9-cis-retinoic acid receptors (RXRalpha, RXRbeta, and RXRgamma) are nuclear receptors that play key roles in multiple hormone-signaling pathways. Biochemical data indicate that, in the absence of ligand, RXR can exist as an inactive tetramer and that its dissociation, induced by ligand, is important for receptor activation. In this article we report the inactivated tetramer structures of the RXRalpha ligand-binding domain (LBD), either in the absence of or in the presence of a nonactivating ligand. These structures reveal that the RXR LBD tetramer forms a compact, disc-shaped complex, consisting of two symmetric dimers that are packed along helices 3 and 11. In each monomer, the AF-2 helix protrudes away from the core domain and spans into the coactivator binding site in the adjacent monomer of the symmetric dimer. In this configuration, the AF-2 helix physically excludes the binding of coactivators and suggests an autorepression mechanism that is mediated by the AF-2 helix within the tetramer. The RXR-tetramer interface is assembled from amino acids that are conserved across several closely related receptors, including the HNF4s and COUP transcription factors, and may therefore provide a model for understanding structure and regulation of this subfamily of nuclear receptors.


    Related Citations: 
    • Asymmetry in the PPARalpha/RXRalpha Crystal Structure Reveals the Molecular Basis of Heterodimerization among Nuclear Receptors
      Gampe Jr., R.T.,Montana, V.G.,Lambert, M.H.,Miller, A.B.,Bledsoe, R.K.,Milburn, M.V.,Kliewer, S.A.,Willson, T.M.,Xu, H.E.
      (2000) Mol.Cell 5: 545


    Organizational Affiliation

    GlaxoWellcome Research and Development, Research Triangle Park, North Carolina 27709, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RETINOIC ACID RECEPTOR RXR-ALPHA
A, B, C, D
238Homo sapiensMutation(s): 0 
Gene Names: RXRA (NR2B1)
Find proteins for P19793 (Homo sapiens)
Go to Gene View: RXRA
Go to UniProtKB:  P19793
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.220 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 51.057α = 90.00
b = 99.305β = 97.38
c = 94.980γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
HKL-2000data scaling
CNXrefinement
HKL-2000data reduction
MAR345data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-04-25
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description