BST2 inhibits type I IFN (interferon) signaling by accelerating MAVS degradation through CALCOCO2-directed autophagy

Macroautophagy/autophagy is a conserved lysosomal degradation system that breaks down intracellular material through the formation of double-membrane autophagosomes in eukaryotic cells. Cargo receptors have been shown to play essential roles in capturing and delivering specific substrates into phagophores, the precursors to autophagosomes, for degradation. However, the detailed mechanism underlying selective recognition of the substrates for autophagic degradation remains poorly understood. Recently, we have revealed that IFN (interferon)-induced BST2 recruits the E3 ubiquitin ligase MARCH8 to catalyze the K27-linked ubiquitination of MAVS for CALCOCO2-directed autophagic degradation, hence inhibiting DDX58-mediated type I interferon signaling through a negative feedback loop.