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. 1996 Mar;70(3):1810–1817. doi: 10.1128/jvi.70.3.1810-1817.1996

Phenotypic properties of herpes simplex virus 1 containing a derepressed open reading frame P gene.

M Lagunoff 1, G Randall 1, B Roizman 1
PMCID: PMC190008  PMID: 8627705

Abstract

Open reading frame P (ORF P) maps in the viral DNA sequences transcribed during latency and is located antisense to the gamma 1 34.5 gene. Earlier studies have shown that the expression of ORF P is repressed by an infected cell protein no. 4 binding site straddling the transcription initiation site. We have made monospecific polyclonal antibodies to the protein and constructed a virus, designated ORF P++, in which the infected cell protein no. 4 binding site has been mutagenized, thereby allowing full expression of an unmodified ORF P gene from its natural promoter. We report the following findings. (i) The native protein forms multiple bands on denaturing polyacrylamide gels suggestive of extensive processing and aggregation of the protein; (ii) the protein accumulates in the nucleus in rod-shaped structures perpendicular to the axis of attachment of the infected cell to the solid matrix; (iii) the virus was highly attenuated on inoculation into mice by the intracerebral or ocular route, and virus was not recovered upon explantation of trigeminal ganglia; (iv) although protein synthesis was not prematurely shut off in the human neuroblastoma cell line SK-N-SH, gamma 1 34.5 protein was not detected in immunoblasts. Analyses of electrophoretically separated denatured RNAs indicated that in cells infected with the ORF P++ virus, there was a large increase in the amount of ORF P RNA and a corresponding decrease in the amount of gamma 1 34.5 RNA. We conclude that either the overproduction of ORF P protein blocks the expression of some herpes simplex virus 1 genes or derepression of the transcription of ORF P has a negative effect on the transcription of the antisense gamma 1 34.5 RNA.

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Selected References

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