Aglycosylated immunoglobulin mutants

摘要

The present invention is based, in part, on our discovery of immunoglobulins (e.g., immunoglobulin G (IgG)) polypeptides (e.g., murine or human IgG, such as human IgG1) that are aglycosylated yet retain the ability to bind to an Fc receptor, such as an activating Fc receptor (e.g., FcγRIIA and/or FcγRIIIA).

主权项

1. An IgG antibody comprising a first mutation in the C′/E loop of the CH2 domain of the Fc region that eliminates antibody glycosylation in the CH2 domain and a second mutation in the F/G loop of the CH2 domain, wherein the antibody exhibits at least 50% binding activity to activating receptor FcγRIIA or FcγRIIIA, relative to the corresponding wild type antibody, wherein the mutation in the F/G loop of the CH2 domain comprises K326I.