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Regulation of in vitro and in vivo transcription of early-region IV of adenovirus type 5 by multiple cis-acting elements


, : Regulation of in vitro and in vivo transcription of early-region IV of adenovirus type 5 by multiple cis-acting elements. Molecular and Cellular Biology 7(7): 2578-2587

A series of deletion mutants spanning the promoter of the adenovirus early-region IV (EIV) gene were tested for transcriptional activity, using both in vitro and in vivo assays. Four distinct domains had additive effects on efficient transcription from the EIV promoter in HeLa whole-cell extracts. The first resided 20 to 27 bases upstream of the initiation site and included the TATA box. Deletion of the TATA box drastically reduced the transcriptional activity in vitro but had a lesser effect in vivo. The second region extended from -32 to -177 and contained two 17-base-pair inverted repeats, centered around -40 and -162. Sequences lying between -140 and -173 were important for efficient transcription since deletion of this region reduced the activity fourfold. Deletion of either one of the two inverted repeats or insertion of DNA fragments between them resulted in the synthesis of extra transcripts that initiated at sites upstream from the EIV site. The third region was located between -198 and -250 and contains three guanosine-plus-cytosine-rich sequences, present around -212 (GGGCGG), -233 (GGGCGG), and -251 (CGCGGG). The fourth, most upstream region was located between -260 and -307. Deletion of this region, which contains the NF-1 factor-binding site, slightly reduced transcriptional activity both in vivo and in vitro. The data indicate that multiple cis-acting elements are required for efficient transcription from the EIV promoter in both in vitro and in vivo systems.

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Accession: 041211211

PMID: 3614200

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