2B50 image
Entry Detail
PDB ID:
2B50
Keywords:
Title:
Human Nuclear Receptor-Ligand Complex 2
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2005-09-27
Release Date:
2006-02-14
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Peroxisome proliferator activated receptor delta
Chain IDs:A, B
Chain Length:272
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Recombinant Human PPAR-beta/delta Ligand-binding Domain is Locked in an Activated Conformation by Endogenous Fatty Acids
J.Mol.Biol. 356 1005 1013 (2006)
PMID: 16405912 DOI: 10.1016/j.jmb.2005.12.047

Abstact

High-resolution crystallographic structures of recombinant human peroxisome proliferator-activated receptor ligand-binding domain (isotype beta/delta) reveal a fatty acid in the binding site. Mass spectrometry confirmed the presence of C16:0, C16:1, C18:0 and C18:1 in a ratio of approximately 3:2:1:4 with 11, Z-octadecenoic acid (cis-vaccenic acid) identified as the predominant species. These are endogenous fatty acids acquired from the bacterial expression system, and serve to lock the ligand-binding domain into the activated conformation. A requirement for crystal growth, the additive n-heptyl-beta-d-glucopyranoside, binds near the activation function helix where recognition of co-activator proteins occurs. Our observations suggest potential physiological ligands for human PPAR-beta/delta and highlight that reported binding studies must be treated with caution unless endogenous fatty acids have been removed from the sample prior to analysis.

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Primary Citation of related structures