Suppressor of RNA-mediated gene silencing, also known as post-transcriptional gene silencing (PTGS), a mechanism of plant viral defense that limits the accumulation of viral RNAs. Promotes viral cell-to-cell long distance movement. Homooligomer. The domains BM and C2 are involved in zinc-binding. Zinc-binding of each of the motifs is critical for the biological activity. The coiled coil domain is probably involved in homooligomerization. Phosphorylated at Ser-79 by a host PKA-like kinase; the phosphorylation at this site seems to suppress host cell death. Belongs to the virgaviridae suppressor of RNA silencing family. The publication has been retracted because some figures presented signs of inappropriate manipulation.