Effects of Galactosylation in Immunoglobulin G from All-Atom Molecular Dynamics Simulations

被引:7
|
作者
Fortunato, Michael E. [1 ]
Colina, Coray M. [1 ]
机构
[1] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 2014年 / 118卷 / 33期
关键词
RHEUMATOID-ARTHRITIS; HUMAN-IGG; ANTIBODY; GLYCOSYLATION; BINDING; ASSOCIATION; COMPLEMENT; LENGTH; AMBER; SITE;
D O I
10.1021/jp504243e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Explicit water atomistic molecular dynamics simulations (200 ns, similar to 330 000 atoms) were performed to study the effects of galactosylation in the F-c domain of immunoglobulin G1. Two glycoforms were simulated to observe changes in protein-carbohydrate interactions and carbohydrate structure. A high degree of flexibility was observed in the small hinge region of the protein, while large domains remained stable. The hinge region flexibility allowed both translation and rotation of the domains relative to each other, resulting in a large number of possible conformations available. The distributions of rotational orientations between the F(ab)1 and F(ab)2 domains showed that while these domains are able to orient themselves rather freely pointing in space they rotated in unison to remain rotationally oriented at specific angles. Additionally, removing specific terminal galactose residues increased the mobility of the carbohydrate, resulting in different protein-carbohydrate interactions. Glycosylation has been suggested as a route to improve the aggregation resistance of monoclonal antibodies for therapeutic treatments to aid the immune system. The results presented here may provide insight into the search for IgG molecules with increased aggregation resistance to be used as monoclonal antibodies.
引用
收藏
页码:9844 / 9851
页数:8
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