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. 1980 Jun;34(3):604–614. doi: 10.1128/jvi.34.3.604-614.1980

Gene expression of herpes simplex virus. II. UV radiological analysis of viral transcription units.

R L Millette, R Klaiber
PMCID: PMC288748  PMID: 6247499

Abstract

The transcriptional organization of the genome of herpes simplex virus type 1 was analyzed by measuring the sensitivity of viral polypeptide synthesis to UV irradiation of the infecting virus. Herpes simplex virus type 1 was irradiated with various doses of UV light and used to infect xeroderma pigmentosum fibroblasts. Immediate early transcription units were analyzed by having cycloheximide present throughout the period of infection, removing the drug at 8 h postinfection, and pulse-labeling proteins with [35S]methionine. Delayed early transcription units were analyzed in similar studies by having 9-beta-D-arabinofuranosyladenine present during the experiment to block replication of the input irradiated genome. The viral polypeptides were separated by gel electrophoresis and quantitated by densitometry of the gel autoradiograms. The following results were obtained. (i) The UV target sizes for the viral transcription units analyzed ranged from 1.44 to 5.65 kilobase pairs. This implies that the corresponding primary transcripts have minimum molecular weights ranging from 0.46 x 10(6). (ii) The genes for the four viral proteins, 165, 145, 116, and 71 (molecular weight x 10(3), exhibited UV target sizes that agree with their calculated gene size or measured mRNA size or both and thus must reside in promoter-adjacent positions. (iii) The transcription units for the remaining genes analyzed showed target sizes that range from 0.42 to 2.59 kilobase pairs greater than needed to encode the respective proteins. This probably is a reflection of their distances from promoters or the presence of intervening sequences or both. It further suggests that these genes are transcribed as precursor RNA molecules that are larger than their mRNA's. (iv) The results indicate that none of the immediate early genes analyzed can be cotranscribed, whereas some of the delayed early genes might be cotranscribed. No evidence was found for the existance of large, multigene transcription units.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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