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Fas is a cell surface death receptor that regulates peripheral tolerance and lymphoid homeostasis. In many pathologic conditions, ectopic Fas activation mediates tissue destruction. Several proteins that can bind to the cytoplasmic death domain of Fas have been implicated in Fas signal transduction. Here we show that FADD, which couples Fas to pro-caspase-8, and, Daxx, which couples Fas to the Jun N-terminal kinase pathway, bind independently to the Fas death domain. We have isolated a death domain mutant, termed FasDelta, that selectively binds Daxx but not FADD. In tranfected tissue culture cells, FasDelta activated Jun N-terminal kinase normally but was impaired in cell death induction. These results suggest that FADD and Daxx activate two independent pathways downstream of Fas and confirm the essential role of FADD binding in apoptosis induction.

proceedings of the national academy of sciences of the united states of america

Dissecting Fas signaling with an altered-specificity death-domain mutant: Requirement of FADD binding for apoptosis but not Jun N-terminal kinase activation