GLYCOPROTEIN GB (GII) OF PSEUDORABIES VIRUS CAN FUNCTIONALLY SUBSTITUTE FOR GLYCOPROTEIN GB IN HERPES-SIMPLEX VIRUS TYPE-1

Glycoproteins homologous to gB of herpes simplex virus (HSV) constitute the most highly conserved family of herpesvirus glycoproteins. All gB homologs analyzed so far have been shown to play essential roles in penetration and direct viral cell-to-cell spread. In studies aimed at assessing whether the high sequence homology is also indicative of functional homology, we analyzed the ability of the gB-homologous glycoprotein (former designation gII) of pseudorabies virus (PrV) to complement a gB(-) HSV type 1 (HSV-1) mutant and vice versa. The results show that a PrV gB-expressing cell line phenotypically complemented the lethal defect in gB(-) HSV-1 whereas reciprocal complementation of a gB(-) PrV mutant by HSV-1 gB was not observed.