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. 1985 Aug;5(8):1997–2008. doi: 10.1128/mcb.5.8.1997

Activation of immediate-early, early, and late promoters by temperature-sensitive and wild-type forms of herpes simplex virus type 1 protein ICP4.

N A DeLuca, P A Schaffer
PMCID: PMC366918  PMID: 3018543

Abstract

To better define the activities on herpes simplex virus type 1 gene expression of temperature-sensitive and wild-type forms of the transcriptional regulatory protein ICP4, regulatory sequences from immediate-early, early, and late herpes simplex virus genes were fused to the gene for chloramphenicol acetyltransferase (CAT). These constructs were used in trans induction and cotransfection experiments with wild-type and temperature-sensitive mutant alleles of ICP4. The ICP4 genes used in this study were cloned from the KOS strain (wild type) and two phenotypically distinct temperature-sensitive ICP4 mutants, tsB32 and tsL14 (DeLuca et al., J. Virol. 52:767-776, 1984), both alone and in conjunction with three other immediate-early genes. The latter series of plasmids was used to assess the influence of additional immediate-early gene products on gene expression in the presence of a given ICP4 allele. The results of this study demonstrate that the phenotypes of these ICP4 mutants observed in cell culture at the nonpermissive temperature were determined in part by activities associated with the mutant ICP4 polypeptides and that these activities differed from those of wild-type ICP4. Low levels of wild-type ICP4 had a marginal but reproducible stimulatory effect on immediate-early CAT gene expression, especially the pIE4/5CAT chimera. This effect was diminished with increasing quantities of ICP4, suggesting an inhibitory role for the wild-type form of the protein. The ICP4 mutants had a strong stimulatory effect on immediate-early CAT expression, consistent with their phenotypes at 39 degrees C. The mutant forms of the ICP4 polypeptide differed in their ability to induce CAT activity from an early chimeric gene. Thus, the tsL14 form of ICP4 was effective in early gene induction (i.e., ptkCAT was induced), whereas the ICP4 derived from tsB32 was slightly inhibitory. Cotransfection of tsB32 ICP4 simultaneously with other immediate-early genes resulted in a marginal increase in ptkCAT induction. This induction was enhanced when the gene for ICP4 was inactivated by restriction enzyme cleavage, substantiating the inhibitory effect of the tsB32 form of ICP4. The two mutant ICP4 genes (tsB32 and tsL14) were unable to trans-activate either of the late CAT constructs (p5CAT and pL42CAT) tested. Cotransfecting tsL14 ICP4 with the other immediate-early genes resulted in activation of p5CAT but not pL42CAT. Taken together, these studies demonstrate that (i) low levels of wild-type ICP4 have stimulatory effect on immediate-early promoters and that higher concentrations of wild-type ICP4 have an inhibitory effect on these promoters, (ii) isolated mutant form of ICP4 exhibit activities that reflect the phenotypes of the mutants from which they were isolated, and (iii) immediate-early gene products other than ICP4 are involved in determining the distinct phenotypes of the two mutants at 39 degrees Celsius.

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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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