Viroporin that forms a ion channel probably displaying low ion selectivity. Plays a role in counteracting host innate immunity by inhibiting TLR7/MyD88/TRAF6 signaling and STAT1 phosphorylation, leading to down-regulation of type-I IFN. Homooligomer (By similarity). Interacts with glycoprotein G (By similarity). Tyrosine phosphorylated. Belongs to the metapneumovirus small hydrophobic protein family.