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Arabinosyladenine, an established antiherpetic drug, was used to block herpes simplex virus type 1 DNA synthesis quantitatively in infected xeroderma pigmentosum cells. Kinetic analyses of viral polypeptides synthesized in the presence and absence of this drug revealed that there were at least six distinct kinetic classes of polypeptides. These differed in time of appearance after infection, time of maximum rate of synthesis, kinetics of turnoff, and sensitivity to arabinosyladenine. This study showed that arabinosyladenine had the following three main effects on herpes simplex virus type 1 gene expression. (i) The turnon of immediate early and delayed early polypeptides (kinetic classes 1 and 2) was retarded. (ii) The turnoff of early (immediate early and delayed early) polypeptides (classes 1 through 3) was delayed. (iii) The synthesis of late polypeptides (class 4 through 6) was inhibited by arabinosyladenine, with class 6 severely (80 to 90%) inhibited. The kinetic data presented here, along with the findings of other workers on the effects of inhibition of viral DNA synthesis, suggest that viral DNA replication is required for optimum synthesis of late viral polypeptides.

Gene expression of herpes simplex virus. III. Effect of arabinosyladenine on viral polypeptide synthesis