Plays several roles during the time course of infection, including egress of virus particles from the perinuclear space and secondary envelopment of cytoplasmic capsids that bud into specific trans-Golgi network (TGN)-derived membranes (PubMed:15890934). Plays also an essential role in the maintenance of host cytoplasmic viral assembly center (cVAC) morphology in primary host neuronal cells (PubMed:32699089). Oligomerizes. Interacts with UL7; this interaction mediates UL7 incorporation to virions. Interacts with UL14 (PubMed:27440890). Localizes to cytoplasmic viral assembly center (cVAC) where capsid envelopment occurs. Phosphorylated. Palmitoylation is necessary for Golgi localization. Belongs to the herpesviridae UL51 family.