FCGR2B

Low affinity immunoglobulin gamma Fc region receptor II-b is a protein that, in humans, is encoded by the FCGR2B gene. FCGR2B (CD32B) is a "low affinity" receptor for Immunoglobulin G (IgG). Mutation in the gene in humans leads to a lupus phenotype. The cytoplasmic part of this receptor contains an immunoreceptor tyrosine-based inhibitory motif, in contrast to the activating isoform, FCGR2A (CD32A).

Function

The inhibitory CD32B is expressed on B cells and myeloid dendritic cells. Ligation of CD32B on B cells downregulates antibody production and may, in some circumstances, promote apoptosis. Co-ligation of CD32B on dendritic cells inhibits maturation and blocks cell activation. CD32B may also be a target for monoclonal antibody therapy for malignancies.

See also

• CD32

External links

• FCGR2B protein, human at the US National Library of Medicine Medical Subject Headings (MeSH)

This article incorporates text from the United States National Library of Medicine, which is in the public domain.