Ion channel protein that acts as a viroporin and plays an essential role in the assembly, envelopment and secretion of viral particles. Regulates the host cell secretory pathway, which induces the intracellular retention of viral glycoproteins and favors assembly of viral particles. Creates a pore in acidic organelles and releases Ca(2+) and H(+) in the cytoplasm of infected cells, leading to a productive viral infection. High levels of cytoplasmic Ca(2+) may trigger membrane trafficking and transport of viral ER-associated proteins to viroplasms, sites of viral genome replication (Probable). This ionic imbalance induces the assembly of the inflammasome complex, which triggers the maturation of pro-IL-1beta into IL-1beta through the action of caspase-1. Targets also host mitochondria and induces mitochondrial depolarization. In addition of its role as a viroporin, acts as a lipid raft adhesion factor 