1G2N

CRYSTAL STRUCTURE OF THE LIGAND BINDING DOMAIN OF THE ULTRASPIRACLE PROTEIN USP, THE ORTHOLOG OF RXRS IN INSECTS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the ligand-binding domain of the ultraspiracle protein USP, the ortholog of retinoid X receptors in insects.

Billas, I.M.Moulinier, L.Rochel, N.Moras, D.

(2001) J.Biol.Chem. 276: 7465-7474

  • DOI: 10.1074/jbc.M008926200

  • PubMed Abstract: 
  • The major postembryonic developmental events happening in insect life, including molting and metamorphosis, are regulated and coordinated temporally by pulses of ecdysone. The biological activity of this steroid hormone is mediated by two nuclear rec ...

    The major postembryonic developmental events happening in insect life, including molting and metamorphosis, are regulated and coordinated temporally by pulses of ecdysone. The biological activity of this steroid hormone is mediated by two nuclear receptors: the ecdysone receptor (EcR) and the Ultraspiracle protein (USP). The crystal structure of the ligand-binding domain from the lepidopteran Heliothis virescens USP reported here shows that the loop connecting helices H1 and H3 precludes the canonical agonist conformation. The key residues that stabilize this unique loop conformation are strictly conserved within the lepidopteran USP family. The presence of an unexpected bound ligand that drives an unusual antagonist conformation confirms the induced-fit mechanism accompanying the ligand binding. The ligand-binding pocket exhibits a retinoid X receptor-like anchoring part near a conserved arginine, which could interact with a USP ligand functional group. The structure of this receptor provides the template for designing inhibitors, which could be utilized as a novel type of environmentally safe insecticides.


    Organizational Affiliation

    Genomics and Structural Biology Laboratory, UPR 9004, Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université Louis Pasteur, 1 rue Laurent Fries, 67404 Illkirch Cedex, Cité Universitaire de Strasbourg, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ULTRASPIRACLE PROTEIN
A
264Heliothis virescensN/A
Find proteins for Q7SIF6 (Heliothis virescens)
Go to UniProtKB:  Q7SIF6
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EPH
Query on EPH

Download SDF File 
Download CCD File 
A
L-ALPHA-PHOSPHATIDYL-BETA-OLEOYL-GAMMA-PALMITOYL-PHOSPHATIDYLETHANOLAMINE
C39 H68 N O8 P
MABRTXOVHMDVAT-AAEGOEIASA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.210 
  • Space Group: P 43 2 2
Unit Cell:
Length (Å)Angle (°)
a = 58.211α = 90.00
b = 58.211β = 90.00
c = 144.687γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
CNSphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-04-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance