Definition:

Functions as antiviral protein and contributes to the defense against retroviral infections. Acts as a capsid-specific restriction factor with the help of TRIM5 and prevents infection from non-host-adapted retroviruses. During influenza A virus infection, promotes programmed cell death by targeting ZBP1 for 'Lys-63'-linked polyubiquitination. In turn, promotes ZBP1 recruitment of RIPK3 to mediate virus-induced programmed necrosis. Negatively regulates the function of mitochondria by enhancing mitochondrial depolarization leading to cytochrome c release and mitochondria-dependent apoptosis. Promotes also the formation of multinucleated giant cells by means of cell fusion and phagocytosis in epithelial cells.