Receptor for TNFSF2/TNF-alpha and homotrimeric TNFSF1/lymphotoxin-alpha. The adapter molecule FADD recruits caspase-8 to the activated receptor. The resulting death-inducing signaling complex (DISC) performs caspase-8 proteolytic activation which initiates the subsequent cascade of caspases (aspartate-specific cysteine proteases) mediating apoptosis (By similarity). Binding of TNF to the extracellular domain leads to homotrimerization. The aggregated death domains provide a novel molecular interface that interacts specifically with the death domain of TRADD. Various TRADD-interacting proteins such as TRAFS, RIPK1 and possibly FADD, are recruited to the complex by their association with TRADD. This complex activates at least two distinct signaling cascades, apoptosis and NF-kappa-B signaling. Interacts with BAG4, BABAM2, FEM1B, GRB2, SQSTM1 and TRPC4AP. Interacts with DAB2IP. Interacts directly with NOL3 (via CARD domain); inhibits TNF-signaling pathway. Interacts with SH3RF2, TRADD and RIPK1. SH3RF2 facilitates the recruitment of RIPK1 and TRADD to TNFRSF1A in a TNF-alpha-dependent process. Interacts with PGLYRP1; this interaction is important for cell death induction. Interacts (via death domain) with MADD (via death domain) (By similarity). Both the cytoplasmic membrane-proximal region and the C-terminal region containing the death domain are involved in the interaction with TRPC4AP.