ORGANELLE MARKERS - Plasma membrane

CD95

Fas/APO-1/CD95 is a 36 kDa cell surface type I-membrane glycoprotein with an apparent molecular weight of 44 kDa on SDSPAGE. Fas is a member of the tumor necrosis factor receptor (TNFR) family, which includes TNFR1, TNFR2, CD27, CD30 and CD40. Binding of Fas-ligand (FasL) to Fas or crosslinking of Fas by anti-Fas monoclonal antibodies leads to apoptosis of Fas expressing cells. Both Fas and TNFR contain a 70 amino acids cytoplasmic .death domain. that is responsible for transmitting signal for apoptosis. Apoptosis induced by Fas-Fas ligand interaction is inhibited by a number of cytosolic factors such as the ICE/CED3 family inhibitor CrmA, and the short and long form of FLIP. Insertion of an early transposable element in intron 2 of Fas structural gene, as in the mouse lpr mutations, causes lymphoproliferation and autoimmunity in mutant mice, suggesting that Fas is involved in clonal deletion of autoreactive T cells.

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