1FNL image
Entry Detail
PDB ID:
1FNL
Title:
CRYSTAL STRUCTURE OF THE EXTRACELLULAR DOMAIN OF A HUMAN FCGRIII
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2000-08-22
Release Date:
2000-11-22
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.21
R-Value Work:
0.18
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:LOW AFFINITY IMMUNOGLOBULIN GAMMA FC REGION RECEPTOR III-B
Chain IDs:A
Chain Length:175
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Crystal structure of the extracellular domain of a human Fc gamma RIII.
Immunity 13 387 395 (2000)
PMID: 11021536 DOI: 10.1016/S1074-7613(00)00038-8

Abstact

Fc receptors play a major role in immune defenses against pathogens and in inflammatory processes. The crystal structure of a human immunoglobulin receptor, FcgammaRIIIb, has been determined to 1.8 A resolution. The overall fold consists of two immunoglobulin-like domains with an acute interdomain hinge angle of approximately 50 degrees. Trp-113, wedged between the N-terminal D1 and the C-terminal D2 domains, appears to further restrict the hinge angle. The putative Fc binding region of the receptor carries a net positive charge complementary to the negative-charged receptor binding regions on Fc. A 1:1 binding stoichiometry between the receptor and Fc was measured by both the equilibrium and nonequilibrium size-exclusion chromatography. Two separate parallel dimers are observed in the crystal lattice, offering intriguing models for receptor aggregation.

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