Protects the virus against cell antiviral state by blocking host interferon signaling. Mechanistically, targets host phosphorylated STAT1 (phospho-STAT1) for degradation, thereby inhibiting the interferon alpha signaling pathway (PubMed:12885886, PubMed:26859759). Plays a role in the inhibition of host apoptosis (PubMed:30290847). Interacts with and down-regulates the expression of host TXNL1. In turn, inhibits TXNL1-induced apoptosis through the BCL2-BAX-caspase 3 pathway (PubMed:30290847). Inhibits host apoptosis also by negatively regulating host CacyBP/SIP (PubMed:30234028). Promotes viral replication by activating the extracellular signal-regulated kinase (ERK) pathway (PubMed:30213106). Interacts with host STAT1. Interacts with host TXNL1 (PubMed:30290847). Interacts (via C-terminus) with host CacyBP; this interaction inhibits host cell apoptosis (PubMed:30234028). Partially edited. RNA editing at this position consists of an insertion of one or two guanine nucleotides. The sequence displayed here is the V protein, derived from the +1G edited RNA. The unedited RNA gives rise to the P protein (AC Q9DLD6), the +2G edited RNA gives rise to the W protein (AC P0C766) (By similarity). The protein V from strain B1 contains one putative zinc-binding domain on its C-terminal region whereas protein V from wild-type avulavirus strains possess two. Belongs to the paramyxoviruses V protein family.