Part of a gH-gL-gO complex. Expressed on the host cell surface as a part of the gH-gL-gO complex. A shorter mature protein, gO-80K, is produced probably by proteolytic cleavage. Modified with high mannose-oligosaccharides. N-glycosylated with complex glycans. Belongs to the herpesviridae U47 family. It is uncertain whether Met-1 or Met-34 is the initiator.