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. 1988 Jan;62(1):297–304. doi: 10.1128/jvi.62.1.297-304.1988

Molecular dissection of cis-acting regulatory elements from 5'-proximal regions of a vaccinia virus late gene cluster.

J N Miner 1, S L Weinrich 1, D E Hruby 1
PMCID: PMC250530  PMID: 3334746

Abstract

Promoter elements responsible for directing the transcription of six tightly clustered vaccinia virus (VV) late genes (open reading frames [ORFs] D11, D12, D13, A1, A2, and A3) from the HindIII D/A region of the viral genome were identified within the upstream sequences proximal to each individual locus. These regions were identified as promoters by excising them from the VV genome, abutting them to the bacterial chloramphenicol acetyl transferase gene, and demonstrating their ability to drive expression of the reporter gene in transient-expression assays in an orientation-specific manner. To delineate the 5' boundary of the upstream elements, two of the VV late gene (A1 and D13) promoter: CAT constructs were subjected to deletion mutagenesis procedures. A series of 5' deletions of the ORF A1 promoter from -114 to -24 showed no reduction in promoter activity, whereas additional deletion of the sequences from -24 to +2 resulted in the complete loss of activity. Deletion of the ORF A1 fragment from -114 to -104 resulted in a 24% increase in activity, suggesting the presence of a negative regulatory region. In marked contrast to previous 5' deletion analyses which have identified VV late promoters as 20- to 30-base-pair cap-proximal sequences, 5' deletions to define the upstream boundary of the ORF D13 promoter identified two positive regulatory regions, the first between -235 and -170 and the second between -123 and -106. Background levels of chloramphenicol acetyltransferase expression were obtained with deletions past -88. Significantly, this places the ORF D13 regulatory regions within the upstream coding sequences of the ORF A1. A high-stringency computer search for homologies between VV late promoters that have been thus far characterized was carried out. Several potential consensus sequences were found just upstream from RNA start sites of temporally related promoter elements. Three major conclusions are drawn from these experiments. (i) The presence of promoters preceding each late ORF supports the hypothesis that each is expressed as an individual transcriptional unit. (ii) Promoter elements can be located within the coding portion of the upstream gene. (iii) Sequence homologies between temporally related promoter elements support the notion of kinetic subclasses of late genes.

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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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