The hinge-engineered IgG1-IgG3 hybrid subclass IgGh₄₇ potently enhances Fc-mediated function of anti-streptococcal and SARS-CoV-2 antibodies.

ABSTRACT: Streptococcus pyogenes can cause invasive disease with high mortality despite adequate antibiotic treatments. To address this unmet need, we have previously generated an opsonic IgG1 monoclonal antibody, Ab25, targeting the bacterial M protein. Here, we engineer the IgG2-4 subclasses of Ab25. Despite having reduced binding, the IgG3 version promotes stronger phagocytosis of bacteria. Using atomic simulations, we show that IgG3's Fc tail has extensive movement in 3D space due to its extended hinge region, possibly facilitating interactions with immune cells. We replaced the hinge of IgG1 with four different IgG3-hinge segment subclasses, IgGh_xx. Hinge-engineering does not diminish binding as with IgG3 but enhances opsonic function, where a 47 amino acid hinge is comparable to IgG

SUBMITTER: Izadi A 

PROVIDER: S-EPMC11055898 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature