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. 1989 Jan;63(1):196–204. doi: 10.1128/jvi.63.1.196-204.1989

Herpes simplex virus type 1 gene products required for DNA replication: identification and overexpression.

P D Olivo 1, N J Nelson 1, M D Challberg 1
PMCID: PMC247673  PMID: 2535726

Abstract

Seven herpes simplex virus (HSV) genes have been shown recently to be necessary and sufficient to support the replication of origin-containing plasmids. Two of these genes (pol and dbp) encode well-known DNA replication proteins (the DNA polymerase and the major single-stranded DNA binding protein), and a third gene (UL42) encodes a previously identified infected-cell protein which binds tightly to double-stranded DNA. The products of the four remaining genes have not previously been identified. Using the predicted amino acid sequence data (D.J. McGeoch, M.A. Dalrymple, A. Dolan, D. McNab, L.J. Perry, P. Taylor, and M.D. Challberg, J. Virol. 62:444-453; D.J. McGeoch and J.P. Quinn, Nucleic Acids Res. 13:8143-8163), we have raised rabbit antisera against the products of all seven genes. We report here the use of these reagents to identify these proteins in infected cells. All seven proteins localized to the nucleus and were expressed in a manner consistent with the idea that they are the products of early genes. Various immunological assays suggest that four of these proteins (UL5, UL8, UL9, and UL52) are made in infected cells in very low abundance relative to the other three. To improve our ability to study these proteins, we have expressed UL5, UL8, UL9, and UL52 in insect cells by using the baculovirus expression system. The HSV protein made in insect cells were immunoprecipitable with the appropriate antisera, and the size of each protein was indistinguishable from the size of the corresponding protein made in HSV-infected Vero cells. Our data offer strong support for the accuracy of open reading frames proposed by McGeoch et al. In addition, the antisera and the overproduced HSV replication proteins should be useful reagents with which to analyze the biochemistry of HSV DNA replication.

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Selected References

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