Plays an essential role in the inhibition of host immune response. Prevents the establishment of cellular antiviral state by blocking interferon-alpha/beta (IFN-alpha/beta) production and signaling pathway. Interacts with host IFIH1/MDA5 and DHX58/LGP2 to inhibit the transduction pathway involved in the activation of IFN-beta promoter, thus protecting the virus against cell antiviral state. Efficiently blocks type I IFN signaling following infection by behaving as a substrate receptor for CUL4-DDB1 E3 ligase complex and targeting host STAT1 for proteasomal degradation. Interacts with host DDB1, STAT2 and IFIH1/MDA5. Partially edited. RNA editing at this position consists of an insertion of two guanine nucleotides. The sequence displayed here is the V protein, derived from the unedited RNA. The edited RNA gives rise to the P protein (AC P11208). Belongs to the paramyxoviruses V protein family.