Abstract
The synthesis of viral-specified glycoproteins, and their appearance on cell surfaces, were compared for cells infected either with syncytial mutants of HSV-1 or with the parental strains from which the mutants were derived. The mutants MP and tsB5, representatives of two different viral genes that affect fusion, were employed in these studies. Cells infected with either mutant gave rise to reduced surface labeling of major viral-specified glycoproteins throughout infection relative to the parental strains. Putative glycoprotein precursors were synthesized in similar amounts throughout infection in mutant and wild-type infected cells. However, during a chase period after a pulse of labeling, fully glycosylated species of glycoproteins accumulated more slowly in mutant than in parent infected cells. This effect was clearly visible early in MP-infected cells and by 9 hr after infection for tsB5-infected cells, and increased thereafter. Apparently the decrease in appearance of glycoproteins on the cell surface of mutant-infected cells is due to a decrease in their rate of processing.
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