Glycoprotein G2 and glycoprotein G1 interact with each other and are present at the surface of the virion. They are able to attach the virion to a cell receptor and to promote fusion of membranes after endocytosis of the virion (By similarity). G2 and G1 interact with each other. Specific enzymatic cleavages in vivo yield mature proteins including glycoprotein G1 and glycoprotein G2. Glycosylated. Glycosylation is essential for proper subcellular location.