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 (By similarity). 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 and type II IFN signaling following infection, probably by targeting host STAT1 for proteasomal degradation. 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 Q86606). Belongs to the paramyxoviruses V protein family.