Envelope glycoprotein gp64 is classified as a class III viral fusion protein. As an envelope phosphate glycoprotein, it promotes the fusion of virus and host endosomal membranes, thereby promoting virus entry into host cells. Following receptor-mediated viral internalization, gp64 undergoes a conformational change at low pH into a fusion-competent state, thereby releasing the nucleocapsid into the host cell cytoplasm upon cell fusion. envelope glycoprotein gp64 Protein, AcmNPV (HEK293, His) is the recombinant Virus-derived envelope glycoprotein gp64 protein, expressed by HEK293 , with C-His labeled tag.