Mapping of adenovirus late promoters with nascent mercurated RNA.
Nascent RNA molecules were labeled in vivo and elongated in vitro by incubation of the isolated nuclei in the presence of mercurated nucleotides. The RNA molecules initiated and labeled in vivo and elongated in vitro were then selectively purified on a thiopropyl 6-B Sepharose affinity column. The procedure was shown to be free of artifacts since the addition of mercurated nucleotides and the retention on the affinity column is mediated by the endogenous RNA polymerase II (nucleoside triphosphate:RNA nucleotidyltransferase; EC 2.7.7.6), is sensitive to actinomycin D, and is dependent on the presence of all four ribonucleotide triphosphates. This general procedure was applied to the mapping of viral promoters late after adenovirus 2 infection of HeLa cells. RNA purified as described above was hybridized to restriction enzyme fragments attached to nitrocellulose filters. The 5' ends of the nascent RNA chains are located in coordinates 9.5-17 for a rightward transcript, 0-25 for a leftward transcript, and possibly 60-70 for a second rightward transcript. These locations clearly differ from locations of the early promoters and therefore suggest that the transition from early to late functions is controlled at the transcriptional level.
D000260:Adenoviruses, Human / Q000235:genetics*; D002846:Chromatography, Affinity / Q000379:methods; D002874:Chromosome Mapping; D005809:Genes, Regulator; D009693:Nucleic Acid Hybridization; D009941:Organomercury Compounds; D012367:RNA, Viral / Q000096:biosynthesis; D013997:Time Factors; D014158:Transcription, Genetic
D009941:Organomercury Compounds; D012367:RNA, Viral
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