The Fas associated via death domain encoded by FADD is an adaptor molecule that interacts with various cell surface receptors and mediates cell apoptotic signals. Through its C-terminal death domain , this protein can be recruited by TNFRSF6/Fas-receptor , tumor necrosis factor receptor , TNFRSF25 , and TNFSF10/TRAIL-receptor , and thus it participates in the death signaling initiated by these receptors. Interaction of this protein with the receptors unmasks the N-terminal effector domain of this protein , which allows it to recruit caspase-8 , and thereby activate the cysteine protease cascade. Knockout studies in mice also suggest the importance of this protein in early T cell development.
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