Low pH Exposure During Immunoglobulin G Purification Methods Results in Aggregates That Avidly Bind Fcg Receptors: Implications for Measuring Fc Dependent Antibody Functions
Ester Lopez, Nichollas E Scott, Bruce D Wines, P Mark Hogarth, Adam K Wheatley, Stephen J Kent, Amy W Chung
FRONTIERS IN IMMUNOLOGY | FRONTIERS MEDIA SA | Published : 2019
Evaluating the biophysical and functional nature of IgG is key to defining correlates of protection in infectious disease, and autoimmunity research cohorts, as well as vaccine efficacy trials. These studies often require small quantities of IgG to be purified from plasma for downstream analysis with high throughput immunoaffinity formats which elute IgG at low-pH, such as Protein G and Protein A. Herein we sought to compare Protein G purification of IgG with an immunoaffinity method which elutes at physiological pH (Melon Gel). Critical factors impacting Fc functionality with the potential to significantly influence FcγR binding, such as IgG subclass distribution, N-glycosylation, aggregati..View full abstract
Awarded by Australian NHMRC
Awarded by American Foundation for AIDS (amfAR) Mathilde Krim Fellowship
This work was supported by an Australian NHMRC project grant (APP1125164) and American Foundation for AIDS (amfAR) Mathilde Krim Fellowship (#109882).