1PK5

Crystal structure of the orphan nuclear receptor LRH-1

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

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This is version 1.2 of the entry. See complete history. 


Literature

Structural basis for ligand-independent activation of the orphan nuclear receptor LRH-1

Sablin, E.P., Krylova, I.N., Fletterick, R.J., Ingraham, H.A.

(2003) Mol Cell 11: 1575-1585

  • DOI: 10.1016/s1097-2765(03)00236-3
  • Primary Citation of Related Structures:  
    1PK5

  • PubMed Abstract: 

    • The orphan nuclear receptors SF-1 and LRH-1 are constitutively active, but it remains uncertain whether their activation is hormone dependent. We report the crystal structure of the LRH-1 ligand binding domain to 2.4 A resolution and find the receptor to be a monomer that adopts an active conformation with a large but empty hydrophobic pocket ...

    The orphan nuclear receptors SF-1 and LRH-1 are constitutively active, but it remains uncertain whether their activation is hormone dependent. We report the crystal structure of the LRH-1 ligand binding domain to 2.4 A resolution and find the receptor to be a monomer that adopts an active conformation with a large but empty hydrophobic pocket. Adding bulky side chains into this pocket resulted in full or greater activity suggesting that, while LRH-1 could accommodate potential ligands, these are dispensable for basal activity. Constitutive LRH-1 activity appears to be conferred by a distinct structural element consisting of an extended helix 2 that provides an additional layer to the canonical LBD fold. Mutating the conserved arginine in helix 2 reduced LRH-1 receptor activity and coregulator recruitment, consistent with the partial loss-of-function phenotype exhibited by an analogous SF-1 human mutant. These findings illustrate an alternative structural strategy for nuclear receptor stabilization in the absence of ligand binding.

    Organizational Affiliation: 

    Department of Biochemistry and Biophysics, University of California-San Francisco, San Francisco, CA 94143, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Orphan nuclear receptor NR5A2A, B248Mus musculusMutation(s): 0 
Gene Names: NR5A2 OR LRH1, Nr5a2, Lrh1
UniProt
Find proteins for P45448 (Mus musculus)
Explore P45448 
Go to UniProtKB:  P45448
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.775α = 90
b = 127.542β = 91.72
c = 53.213γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-07-01
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance