Abstract
For use in various applications in research on herpes simplex virus type 1, we attempted to generate recombinant HSV-1 expressing green fluorescent protein (GFP) without any loss of viral genes. Our results were as follows. (i) A recombinant HSV-1 (YK333), in which a GFP expression cassette driven by the Egr-1 promoter was inserted into the intergenic region between UL3 and UL4, was constructed. (ii) YK333 replicated as well as wild-type HSV-1 F strain in Vero cells. (iii) As one application of the recombinant YK333 for research on HSV-1, we developed a system to detect anti-herpetic activity, termed a fluorescence-based anti-viral assay. The 50% inhibitory concentration of ganciclovir for YK333 determined using our newly developed assay was comparable to that determined using a plaque reduction assay. YK333 will be a convenient tool for herpes simplex virus research, including such applications as monitoring of viral replication in vitro and in vivo, and rapid screening of potential anti-herpetic agents.
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