Patent ID: 11634495

Abstract:
The present invention relates to polypeptides comprising a mutant human IgG4, which mutant human IgG4 is capable of increasing the binding to and activation of immunoreceptor tyrosine-based inhibitory motif (ITIM)-containing FcγRIIb/c (CD32b), but not FcγRIIa (CD32a). More specifically, the invention relates to polypeptides comprising at least one human IgG4 with a lysine at position 409 (409K), using the EU index according to Kabat et al., which IgG4 is capable of binding to human CD32b/c with a statistically significant (p=0.05) higher binding affinity than a wild-type human IgG1 and than a wild-type human IgG4, for use in the prevention and/or treatment of an autoimmune disease or allergy, as further defined in the claims.