1HG4

Ultraspiracle ligand binding domain from Drosophila melanogaster


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.248 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

The Structure of the Ultraspiracle Ligand-Binding Domain Reveals a Nuclear Receptor Locked in an Inactive Conformation

Clayton, G.M.Peak-Chew, S.Y.Evans, R.M.Schwabe, J.W.R.

(2001) Proc Natl Acad Sci U S A 98: 1549

  • DOI: https://doi.org/10.1073/pnas.98.4.1549
  • Primary Citation of Related Structures:  
    1HG4

  • PubMed Abstract: 

    Ultraspiracle (USP) is the invertebrate homologue of the mammalian retinoid X receptor (RXR). RXR plays a uniquely important role in differentiation, development, and homeostasis through its ability to serve as a heterodimeric partner to many other nuclear receptors. RXR is able to influence the activity of its partner receptors through the action of the ligand 9-cis retinoic acid. In contrast to RXR, USP has no known high-affinity ligand and is thought to be a silent component in the heterodimeric complex with partner receptors such as the ecdysone receptor. Here we report the 2.4-A crystal structure of the USP ligand-binding domain. The structure shows that a conserved sequence motif found in dipteran and lepidopteran USPs, but not in mammalian RXRs, serves to lock USP in an inactive conformation. It also shows that USP has a large hydrophobic cavity, implying that there is almost certainly a natural ligand for USP. This cavity is larger than that seen previously for most other nuclear receptors. Intriguingly, this cavity has partial occupancy by a bound lipid, which is likely to resemble the natural ligand for USP.


  • Organizational Affiliation

    Medical Research Council, Laboratory of Molecular Biology, Cambridge CB2 2QH, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ULTRASPIRACLE
A, B, C, D, E
A, B, C, D, E, F
279Drosophila melanogasterMutation(s): 0 
UniProt
Find proteins for P20153 (Drosophila melanogaster)
Explore P20153 
Go to UniProtKB:  P20153
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20153
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.248 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.98α = 85.57
b = 86.19β = 85.94
c = 137γ = 83.09
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-02-23
    Type: Initial release
  • Version 1.1: 2015-02-11
    Changes: Database references, Derived calculations, Non-polymer description, Other, Refinement description, Source and taxonomy, Structure summary, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Refinement description