May play a role in innate immunity by inhibiting the antiviral RIG-I signaling pathway. In this pathway, functions as a negative regulator of DDX58/RIG-I, the cytoplasmic sensor of viral nucleic acids. Prevents the interaction of DDX58 with MAVS/IPS1, an important step in signal propagation. May also regulate the SLC18A3 and SLC5A7 cholinergic transporters. Interacts with DDX58 (via tandem CARD domain); the interaction is direct. Interacts (via GOLD domain) with SLC18A3; the interaction is direct. Interacts with SLC5A7 (via GOLD domain); the interaction is direct.