5YC5 image
Entry Detail
PDB ID:
5YC5
Keywords:
Title:
Crystal structure of human IgG-Fc in complex with aglycan and optimized Fc gamma receptor IIIa
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2017-09-06
Release Date:
2018-03-21
Method Details:
Experimental Method:
Resolution:
2.71 Å
R-Value Free:
0.27
R-Value Work:
0.20
R-Value Observed:
0.21
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Immunoglobulin gamma-1 heavy chain
Chain IDs:A, B
Chain Length:223
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Low affinity immunoglobulin gamma Fc region receptor III-A
Mutations:V27E, F29I, Y35N, Q48R, F75L, N92S, V117E, E121G, F171S
Chain IDs:C
Chain Length:182
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
FUC D FUC -L
GAL D GAL -D
MAN D MAN -D
NAG D NAG -D
Ligand Molecules
Primary Citation
Assessing the Heterogeneity of the Fc-Glycan of a Therapeutic Antibody Using an engineered Fc gamma Receptor IIIa-Immobilized Column.
Sci Rep 8 3955 3955 (2018)
PMID: 29500371 DOI: 10.1038/s41598-018-22199-8

Abstact

The N-glycan moiety of IgG-Fc has a significant impact on multifaceted properties of antibodies such as in their effector function, structure, and stability. Numerous studies have been devoted to understanding its biological effect since the exact composition of the Fc N-glycan modulates the magnitude of effector functions such as the antibody-dependent cell mediated cytotoxicity (ADCC), and the complement-dependent cytotoxicity (CDC). To date, systematic analyses of the properties and influence of glycan variants have been of great interest. Understanding the principles on how N-glycosylation modulates those properties is important for the molecular design, manufacturing, process optimization, and quality control of therapeutic antibodies. In this study, we have separated a model therapeutic antibody into three fractions according to the composition of the N-glycan by using a novel FcγRIIIa chromatography column. Notably, Fc galactosylation was a major factor influencing the affinity of IgG-Fc to the FcγRIIIa immobilized on the column. Each antibody fraction was employed for structural, biological, and physicochemical analysis, illustrating the mechanism by which galactose modulates the affinity to FcγRIIIa. In addition, we discuss the benefits of the FcγRIIIa chromatography column to assess the heterogeneity of the N-glycan.

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Primary Citation of related structures