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. 1987 Jan;61(1):190–199. doi: 10.1128/jvi.61.1.190-199.1987

Comparison of upstream sequence requirements for positive and negative regulation of a herpes simplex virus immediate-early gene by three virus-encoded trans-acting factors.

P O'Hare, G S Hayward
PMCID: PMC255235  PMID: 3023697

Abstract

Using a short-term cotransfection system with recombinant chloramphenicol acetyltransferase (CAT) target genes and intact genes for regulatory proteins, we previously demonstrated that expression from the promoter-regulatory region of the gene for the immediate-early 175,000-molecular-weight (IE175K) protein of herpes simplex virus type 1 was subject to trans-acting effects by three different virus-encoded components. In the present work we have attempted to delineate the upstream cis-acting requirements within the IE175K promoter-regulatory region for stimulation by the late structural protein Vmw65, stimulation by the IE110K protein, and repression by its own gene product, the IE175K protein. Our results augment previous reports of others by demonstrating that a construct containing only the single TAATGARAT consensus sequence, TAATGGAAT, between -115 and -106 was efficiently induced by Vmw65. Deletion to -108 effectively abolished the response to Vmw65. However, this latter construct remained responsive to IE110K stimulation and was induced as efficiently as the parental construct which contained sequences to -1900. Furthermore, not only basal levels of expression, but also Vmw65 activation of the parental construct and deletion mutants delta 380, delta 330, delta 300, and delta 160 and IE110K-activated expression of the delta 108 construct were all subject to dominant repression by the IE175K protein. Finally, we show that expression from each of the deletions was open to stimulation by linkage to the simian virus 40 enhancer region. Enhancer-stimulated expression from each construct, including the -108 deletion, was efficiently repressed by the IE175K protein. In contrast, expression from the simian virus 40 enhancer when linked to its own promoter was unaffected by IE175K. These results place sequence requirements for both IE110K stimulation and IE175K autoregulation within the minimal promoter region -108 to +30, separate from the major requirements for Vmw65 activation located further upstream.

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