CD81
Synonyms
Historical Background
CD81 was originally identified as a Target of an Anti-Proliferative Antibody (TAPA-1) in a study that also defined a new family of transmembrane proteins, later named tetraspanins (Oren et al. 1990). CD81 is expressed on most human cell types; however, Oren et al. have shown that the sensitivity of diverse cell lineages to the anti-proliferative effect of the anti-CD81 antibody differed (Oren et al. 1990). Therefore, subsequent immune-co-precipitation studies were performed to reveal that CD81 associates with different partner proteins in the various cells types. For example, in B cells CD81 associates with CD19, a B cell specific signaling molecule. Similar studies on additional family members confirmed that tetraspanins tend to associate in the membrane with each other and with additional partner proteins. These tetraspanin-enriched microdomains (TEMs) are dynamic membrane entities, which act as signaling platforms (reviewed in (Levy...
References
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