Acetylaminofluorene and aminofluorene adducts inhibit in vitro transcription of a Xenopus 5S RNA gene only when located on the coding strand
Journal
Proceedings of the National Academy of Sciences of the United States of America
Journal Volume
88
Journal Issue
21
Pages
9583-9587
Date Issued
1991
Author(s)
Abstract
Unique N-acetyl-2-aminofluorene (AAF) or 2-aminofluorene (AF) adducts were introduced into the Xenopus borealis somatic 5S RNA gene between the intragenic control region and the transcription termination site. The effects of these bulky adducts on transcription were studied in a cell-free extract derived from Xenopus laevis oocytes. AAF and AF adducts inhibit transcription only when they are on the template strand, whereas transcription passes through these adducts when they are placed on the nontemplate strand. In the presence of the AAF or AF adduct on the template strand, transcription usually terminates one nucleotide before the altered guanine residue. Premature termination at these bulky adducts does not block reinitiation of transcription, since several transcripts are produced per gene per hour on these damaged templates.
Type
journal article