Death Domain Superfamily of protein-protein interaction domains
The Death Domain (DD) superfamily includes the DD, Pyrin, CARD (Caspase activation and recruitment domain) and DED (Death Effector Domain) families. DDs are protein-protein interaction domains found in a variety of domain architectures. Their common feature is that they form homodimers by self-association or heterodimers by associating with other members of the DD superfamily. They serve as adaptors in signaling pathways and can recruit other proteins into signaling complexes. They are prominent components of the programmed cell death (apoptosis) pathway and are found in a number of other signaling pathways including those that impact innate immunity, inflammation, differentiation, and cancer.