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CD21

Function

Receptor for complement C3, for the Epstein-Barr virus on human B-cells and T-cells and for HNRNPU (PubMed:7753047). Participates in B lymphocytes activation (PubMed:7753047).

(Microbial infection) Acts as a receptor for Epstein-Barr virus.

Involvement in disease

Systemic lupus erythematosus 9

SLEB9

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.

Immunodeficiency, common variable, 7

CVID7

A primary immunodeficiency characterized by antibody deficiency, hypogammaglobulinemia, recurrent bacterial infections and an inability to mount an antibody response to antigen. The defect results from a failure of B-cell differentiation and impaired secretion of immunoglobulins; the numbers of circulating B-cells is usually in the normal range, but can be low.

None

The disease is caused by variants affecting the gene represented in this entry.

Sequence similarities

Belongs to the receptors of complement activation (RCA) family.

Tissue specificity

Mature B-lymphocytes, T-lymphocytes, pharyngeal epithelial cells, astrocytes and follicular dendritic cells of the spleen.

Cellular localization

  • Cell membrane
  • Single-pass type I membrane protein

Alternative names

  • Complement receptor type 2
  • Cr2
  • Complement C3d receptor
  • Epstein-Barr virus receptor
  • EBV receptor
  • C3DR
  • CR2

Target type

Proteins

Primary research area

Immunology & Infectious Disease

Other research areas

  • Immuno-oncology

Molecular weight

112916Da