CD22 binds B-cell receptor

Stable Identifier
Reaction [binding]
Homo sapiens
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Physical association of CD22 with the BCR seems to have direct involvement in the regulation of BCR signalling, as antibody-mediated clustering of CD22 with the BCR leads to dampened signaling (Smith et al. 1998), and evidence of their association has been obtained by confocal microscopy, coimmunoprecipitation and chemical crossing (Zhang et al. 2004, Phee et al. 2001, Peaker et al. 1993, Law et al. 1994, Leprince et al. 1993, Collins et al. 2006). Forced ligation of CD22 to the BCR dramatically increases CD22 phosphorylation and suppression of BCR signalling (Macauley, 2013). This is relevant to suppression of BCR signalling to membrane antigens on B cells that contain self sialic acids (Lanoue, 2002; Macauley 2013). CD22 ligand binding modulates its activity as a negative regulator of B cell signalling.

Literature References
PubMed ID Title Journal Year
7561031 Ig domains 1 and 2 of murine CD22 constitute the ligand-binding domain and bind multiple sialylated ligands expressed on B and T cells

Chandran, KA, Doty, RT, Clark, EA, Aruffo, A, Law, CL

J. Immunol. 1995
8475064 CD22 associates with the human surface IgM-B-cell antigen receptor complex

Draves, KE, Clark, EA, Ledbetter, JA, Geahlen, RL, Leprince, C

Proc. Natl. Acad. Sci. U.S.A. 1993
11994425 Sialic acid binding domains of CD22 are required for negative regulation of B cell receptor signaling

McLean, PA, Neel, BG, Wortis, HH, Jin, L

J. Exp. Med. 2002
7706301 Binding of human plasma sialoglycoproteins by the B cell-specific lectin CD22. Selective recognition of immunoglobulin M and haptoglobin

Varki, A, Hanasaki, K, Powell, LD

J. Biol. Chem. 1995
Orthologous Events
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