Skip to main content

FCGR2B

Domain

Contains 1 copy of a cytoplasmic motif that is referred to as the immunoreceptor tyrosine-based inhibitor motif (ITIM). This motif is involved in modulation of cellular responses. The phosphorylated ITIM motif can bind the SH2 domain of several SH2-containing phosphatases.

Function

Receptor for the Fc region of complexed or aggregated immunoglobulins gamma. Low affinity receptor. Involved in a variety of effector and regulatory functions such as phagocytosis of immune complexes and modulation of antibody production by B-cells. Binding to this receptor results in down-modulation of previous state of cell activation triggered via antigen receptors on B-cells (BCR), T-cells (TCR) or via another Fc receptor. Isoform IIB1 fails to mediate endocytosis or phagocytosis. Isoform IIB2 does not trigger phagocytosis.

Involvement in disease

Systemic lupus erythematosus

SLE

A chronic, relapsing, inflammatory, and often febrile multisystemic disorder of connective tissue, characterized principally by involvement of the skin, joints, kidneys and serosal membranes. It is of unknown etiology, but is thought to represent a failure of the regulatory mechanisms of the autoimmune system. The disease is marked by a wide range of system dysfunctions, an elevated erythrocyte sedimentation rate, and the formation of LE cells in the blood or bone marrow.

None

Disease susceptibility is associated with variants affecting the gene represented in this entry.

Post-translational modifications

Phosphorylated by the SRC-type Tyr-kinases LYN and BLK.

Tissue specificity

Is the most broadly distributed Fc-gamma-receptor. Expressed in monocyte, neutrophils, macrophages, basophils, eosinophils, Langerhans cells, B-cells, platelets cells and placenta (endothelial cells). Not detected in natural killer cells.

Cellular localization

  • Cell membrane
  • Single-pass type I membrane protein

Alternative names

  • Low affinity immunoglobulin gamma Fc region receptor II-b
  • IgG Fc receptor II-b
  • CDw32
  • Fc-gamma RII-b
  • Fc-gamma-RIIb
  • FcRII-b
  • IGFR2
  • FCG2
  • CD32
  • FCGR2B

Target type

Proteins

Primary research area

Immunology & Infectious Disease

Other research areas

  • Immuno-oncology

Molecular weight

34044Da