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E-5-(2-Bromovinyl)-2'-deoxyuridine (BrvdUrd) produced a dose-dependent shift in the density of herpes simplex virus type 1 (HSV-1) DNA at concentrations which yielded potent inhibition of virus replication in cultured Vero cells. Although the density of cellular DNA was not altered by these concentrations of BrvdUrd, incorporation of this analogue into cellular DNA of HSV-1-infected cells has been previously observed in this laboratory. The degree of inhibition correlated with the amount of BrvdUrd substituted for thymidine in HSV-1 DNA. BrvdUrd-substituted DNA was more labile as determined by a dose-dependent increase in single strand breaks when examined by centrifugation in alkaline sucrose gradients. Thus, the potent antiviral action of BrvdUrd observed in cell culture correlates not only with its incorporation into HSV-1 DNA but also with an altered stability of this DNA.
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