Abstract
We examined the expression and localization of herpesvirus proteins in monkey cells transfected with recombinant plasmids containing herpes simplex virus (HSV) DNA sequences. Low levels of expression of the major HSV DNA-binding protein ICP8 were observed when ICP8-encoding plasmids were introduced into cells alone. ICP8 expression was greatly increased when a recombinant plasmid encoding the HSV alpha (immediate-early) ICP4 and ICP0 genes was transfected with the ICP8 gene. Deletion and subcloning analysis indicated that two separate functions capable of stimulating ICP8 expression were encoded on the alpha gene plasmid. One mapped in or near the ICP4 gene, and one mapped in or near the ICP0 gene. Their stimulatory effects were synergistic when introduced on two separate plasmids. Thus, two separate viral functions can activate herpesvirus early gene expression in transfected cells.
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