3VG0 image
Entry Detail
PDB ID:
3VG0
Keywords:
Title:
Antibody Fab fragment
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2012-01-10
Release Date:
2012-03-14
Method Details:
Experimental Method:
Resolution:
2.27 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Monoclonal antibody 9F8 Fab fragment H chain
Chain IDs:B (auth: H)
Chain Length:223
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Monoclonal antibody 9F8 Fab fragment L chain
Chain IDs:A (auth: L)
Chain Length:215
Number of Molecules:1
Biological Source:Mus musculus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
Structure of the human obesity receptor leptin-binding domain reveals the mechanism of leptin antagonism by a monoclonal antibody.
Structure 20 487 497 (2012)
PMID: 22405007 DOI: 10.1016/j.str.2012.01.019

Abstact

Leptin regulates energy homeostasis, fertility, and the immune system, making it an important drug target. However, due to a complete lack of structural data for the obesity receptor (ObR), leptin's mechanism of receptor activation remains poorly understood. We have crystallized the Fab fragment of a leptin-blocking monoclonal antibody (9F8), both in its uncomplexed state and bound to the leptin-binding domain (LBD) of human ObR. We describe the structure of the LBD-9F8 Fab complex and the conformational changes in 9F8 associated with LBD binding. A molecular model of the putative leptin-LBD complex reveals that 9F8 Fab blocks leptin binding through only a small (10%) overlap in their binding sites, and that leptin binding is likely to involve an induced fit mechanism. This crystal structure of the leptin-binding domain of the obesity receptor will facilitate the design of therapeutics to modulate leptin signaling.

Legend

Protein

Chemical

Disease

Primary Citation of related structures