4PLE

Human Nuclear Receptor Liver Receptor Homologue-1, LRH-1, Bound to an E. Coli Phospholipid and a Fragment of TIF-2

  • Classification: TRANSCRIPTION
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2014-05-16 Released: 2015-12-16 
  • Deposition Author(s): Ortlund, E.A., Musille, P.M.
  • Funding Organization(s): National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK), National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS), American Heart Association

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Unexpected Allosteric Network Contributes to LRH-1 Co-regulator Selectivity.

Musille, P.M.Kossmann, B.R.Kohn, J.A.Ivanov, I.Ortlund, E.A.

(2016) J Biol Chem 291: 1411-1426

  • DOI: 10.1074/jbc.M115.662874
  • Primary Citation of Related Structures:  
    4PLD, 4PLE

  • PubMed Abstract: 
  • Phospholipids (PLs) are unusual signaling hormones sensed by the nuclear receptor liver receptor homolog-1 (LRH-1), which has evolved a novel allosteric pathway to support appropriate interaction with co-regulators depending on ligand status. LRH-1 plays an important role in controlling lipid and cholesterol homeostasis and is a potential target for the treatment of metabolic and neoplastic diseases ...

    Phospholipids (PLs) are unusual signaling hormones sensed by the nuclear receptor liver receptor homolog-1 (LRH-1), which has evolved a novel allosteric pathway to support appropriate interaction with co-regulators depending on ligand status. LRH-1 plays an important role in controlling lipid and cholesterol homeostasis and is a potential target for the treatment of metabolic and neoplastic diseases. Although the prospect of modulating LRH-1 via small molecules is exciting, the molecular mechanism linking PL structure to transcriptional co-regulator preference is unknown. Previous studies showed that binding to an activating PL ligand, such as dilauroylphosphatidylcholine, favors LRH-1's interaction with transcriptional co-activators to up-regulate gene expression. Both crystallographic and solution-based structural studies showed that dilauroylphosphatidylcholine binding drives unanticipated structural fluctuations outside of the canonical activation surface in an alternate activation function (AF) region, encompassing the β-sheet-H6 region of the protein. However, the mechanism by which dynamics in the alternate AF influences co-regulator selectivity remains elusive. Here, we pair x-ray crystallography with molecular modeling to identify an unexpected allosteric network that traverses the protein ligand binding pocket and links these two elements to dictate selectivity. We show that communication between the alternate AF region and classical AF2 is correlated with the strength of the co-regulator interaction. This work offers the first glimpse into the conformational dynamics that drive this unusual PL-mediated nuclear hormone receptor activation.


    Organizational Affiliation

    From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322 and eortlun@emory.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Nuclear receptor subfamily 5 group A member 2 ACEG245Homo sapiensMutation(s): 0 
Gene Names: NR5A2B1FCPFFTF
Find proteins for O00482 (Homo sapiens)
Explore O00482 
Go to UniProtKB:  O00482
NIH Common Fund Data Resources
PHAROS:  O00482
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Nuclear receptor coactivator 2 BDFH14Homo sapiensMutation(s): 0 
Gene Names: NCOA2BHLHE75SRC2TIF2
Find proteins for Q15596 (Homo sapiens)
Explore Q15596 
Go to UniProtKB:  Q15596
NIH Common Fund Data Resources
PHAROS:  Q15596
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.947α = 90
b = 76.885β = 95.46
c = 108.482γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United StatesRO1DK095750
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesT32ES012870
American Heart AssociationUnited States12PRE12060583

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-16
    Type: Initial release
  • Version 1.1: 2016-01-27
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Author supporting evidence, Database references, Derived calculations, Refinement description
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence