| Literature DB >> 4350713 |
B S Zain, R Dhar, S M Weissman, P Lebowitz, A M Lewis.
Abstract
The DNA of simian virus 40 (SV40) was transcribed into RNA by Escherichia coli RNA polymerase at 18 to 24 C after synchronization of the initiation of RNA synthesis. After a brief synthetic period the RNA product contained relatively large amounts of sequences derived from a limited segment of SV40 DNA. The source for this pulse-labeled RNA was found to be a portion of the segment of SV40 DNA included within the nondefective adenovirus (Ad)-SV40 hybrid viruses, Ad2(+)ND(1) and Ad2(+)ND(3). After synthesis with [gamma-(32)P] ATP, Ad2(+)ND(1) and Ad2(+)ND(3) DNA transcripts contained an initial sequence missing from Ad2 transcripts. This sequence was identified as an initiation sequence for polymerase transcription of the SV40 DNA. Thus, there is a preferred site for initiation of in vitro transcription on the segment of SV40 DNA common to the nondefective Ad2(+)ND(1) and Ad2(+)ND(3) hybrid viruses.Entities:
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Year: 1973 PMID: 4350713 PMCID: PMC355164
Source DB: PubMed Journal: J Virol ISSN: 0022-538X Impact factor: 5.103