3URF image
Deposition Date 2011-11-22
Release Date 2012-07-11
Last Version Date 2024-10-30
Entry Detail
PDB ID:
3URF
Keywords:
Title:
Human RANKL/OPG complex
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.70 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 41 3 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Tumor necrosis factor ligand superfamily member 11, soluble form
Gene (Uniprot):TNFSF11
Chain IDs:A
Chain Length:162
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Tumor necrosis factor receptor superfamily member 11B
Gene (Uniprot):TNFRSF11B
Chain IDs:B (auth: Z)
Chain Length:171
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN B ASN GLYCOSYLATION SITE
Ligand Molecules
Primary Citation
Crystal Structure of Human RANKL Complexed with Its Decoy Receptor Osteoprotegerin
J.Immunol. 189 245 252 (2012)
PMID: 22664871 DOI: 10.4049/jimmunol.1103387

Abstact

Receptor activator of NF-κB ligand (RANKL), its signaling receptor RANK, and its decoy receptor osteoprotegerin (OPG) constitute a molecular triad that is critical in regulating bone remodeling, and also plays multiple roles in the immune system. OPG binds RANKL directly to block its interaction with RANK. In this article, we report the 2.7-Å crystal structure of human RANKL trimer in complex with the N-terminal fragment of human OPG containing four cysteine-rich TNFR homologous domains (OPG-CRD). The structure shows that RANKL trimer uses three equivalent grooves between two neighboring monomers to interact with three OPG-CRD monomers symmetrically. A loop from the CRD3 domain of OPG-CRD inserts into the shallow groove of RANKL, providing the major binding determinant that is further confirmed by affinity measurement and osteoclast differentiation assay. These results, together with a previously reported mouse RANKL/RANK complex structure, reveal that OPG exerts its decoy receptor function by directly blocking the accessibilities of important interacting residues of RANKL for RANK recognition. Structural comparison with TRAIL/death receptor 5 complex also reveals structural basis for the cross-reactivity of OPG to TRAIL.

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Primary Citation of related structures