Attaches the virus to host cellular receptor, inducing clathrin-dependent endocytosis of the virion. In the endosome, the acidic pH induces conformational changes in the glycoprotein trimer, which trigger fusion between virus and endosomal membrane (By similarity). Homotrimer. Glycosylated by host. Palmitoylated by host (By similarity). Belongs to the vesiculovirus glycoprotein family.