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. 1976 Apr;18(1):58–64. doi: 10.1128/jvi.18.1.58-64.1976

Deoxyribonucleoside triphosphate pools in synchronized human cells infected with herpes simplex virus types 1 and 2.

B Roller, G H Cohen
PMCID: PMC515521  PMID: 176471

Abstract

Deoxyribonucleoside triphosphate pools in uninfected and herpes simplex virus type 1 (HSV-1)- and HSV-2-infected KB cells were analyzed to determine whether ribonucleotide reductase functions in vivo in the presence and absence of thymidine (TdR). Previously we showed that HSV-2 replication was inhibited in KB cells blocked in their capacity to synthesize DNA by TdR. HSV-1 replication was not inhibited under these conditions. Both HSV-1 and HSV-2 induced an altered ribonucleotide reductase resistant to dTTP inhibition. Thus, the block to HSV-2 replication apparently was not at the level of reductase. However, the in vitro activity of the enzyme does not necessarily correspond to intracellular conditions. In TdR-blocked HSV-2-infected cells, we found that, while dTTP levels remained high, dCTP concentrations increased. In contrast, KB cells blocked by TdR showed increased dTTP but decreased dCTP levels. We conclude that the HSV-2 enzyme is functional in vivo and that TdR inhibits viral replication by a mechanism other than depletion of dCTP. Infection of KB cells with HSV-1 or HSV-2 altered both dATP and dGTP levels in the presence or absence of TdR. Inhibition of viral replication was not explained by changes in these pools. We suggest that, during infection, HSV-1 induces a virus function(s) not related to reductase which is resistant to TdR, whereas the corresponding HSV-2 function is sensitive. Our evidence shows that the TdR-sensitive function is not in the pathways leading to deoxyribonucleoside triphosphate and may occur at the level of DNA replication.

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Selected References

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