Adapter protein which constitutively binds TBK1 and IKBKE playing a role in antiviral innate immunity. Essential for the efficient induction of IRF-dependent transcription following infection with Sendai virus (By similarity). Homodimer (By similarity). May form a heterodimer with NAP1. Interacts with TKB1 and IKBKE (By similarity). Weakly interacts with DDX3X (By similarity).