Abstract
The effect of DNA supercoiling on in vitro transcription from the early region 4 (E4) promoter of adenovirus type 5 (Ad5) has been investigated by using a cell-free transcription system that maintains supercoiled DNA templates. The supercoiled DNAs yield several-fold higher levels of E4 transcripts and more faithfully reflect the regulation of in vivo transcription than the linear DNAs.
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