cluster of differentiation-22, is a molecule belonging to the SIGLECfamily of lectins.cite journal | author = Crocker PR, Clark EA, Filbin M, Gordon S, Jones Y, Kehrl JH, Kelm S, Le Douarin N, Powell L, Roder J, Schnaar RL, Sgroi DC, Stamenkovic K, Schauer R, Schachner M, van den Berg TK, van der Merwe PA, Watt SM, Varki A | title = Siglecs: a family of sialic-acid binding lectins | journal = Glycobiology | volume = 8 | issue = 2 | pages = v | year = 1998 | pmid = 9498912 | doi = 10.1093/glycob/8.2.0 | issn = ] Generally speaking, CD22 is a regulatory molecule that prevents the overactivation of the immune system and the development of autoimmune diseases.
CD22 is a sugar binding
transmembrane protein, which specifically binds sialic acidwith an immunoglobulin (Ig) domain located at its N-terminus. The presence of Ig domains makes CD22 a member of the immunoglobulin superfamily. CD22 functions as an inhibitory receptor for B cell receptor(BCR) signalling.
Epstein-Barr virus) is known to bind to the B lymphocyte via the CD22 receptor.
BL22, that targets this receptor is being tested at the NIH.cite web | url = http://clinicaltrials.gov/ct/show/NCT00074048 | title = BL22 Immunotoxin in Treating Patients Previously Treated With Cladribine for Hairy Cell Leukemia | accessdate = 2008-02-19 | author = | authorlink = | coauthors = | date = | format = | work = | publisher = ClinicalTrials.gov - U.S. National Institutes of Health | pages = | language = | archiveurl = | archivedate = | quote = ]
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