DAI/ZBP1 contains two RHIM domains that mediate the recruitment of RIP1 and RIP3. (A) Sequence alignment of the RHIM domains of human and murine RIP1, RIP3, TRIF and DAI. The four amino-acid motif crucial for RHIM function is boxed. The black and grey shading indicate more than 60% amino-acid-sequence identity and similarity, respectively. (B,C,E,F,H,I) HEK293T cells were transfected with the indicated VSV or Flag constructs. Immunoprecipitates and cell extracts were analysed by immunoblot. In (F), white and black arrowheads indicate modified and unmodified RIP3, respectively (see text and Fig 3C–E) (D) Domain architecture of RIP1 and RIP3, and schematic views of deletion constructs used in (C), (E) and (F). RHIM* denotes the construct with alanine substitutions of the four amino acids highlighted in (A). (G) Domain architecture of human DAI and schematic views of the constructs used in this study. RHIM* denotes the construct with alanine substitutions of the four amino acids highlighted in (A) in the indicated RHIM domains. DAI, DNA-dependent activator of IRFs; DD, death domain; HEK, human embryonic kidney; Hs, human; IB, immunoblot; ID, intermediate domain; IP, immunoprecipitates; KD, kinase domain; Mm, murine; RHIM, RIP homotypic interaction motif; RIP, receptor-interacting protein; VSV, vesicular stomatitis virus; WT, wild type; XT, cell extracts; ZBP1, Z-DNA binding protein 1.