Abstract
A 100-base-pair fragment of adenovirus 2 (Ad2) DNA encompassing the major late transcriptional promoter was inserted into the simian virus 40 (SV40) late promoter region at SV40 nucleotide 294 to study the effects of a strong TATA box-containing promoter on SV40 late transcription. pSVAdE contains the insert in an orientation such that it would promote transcription towards the origin and early region of SV40, while the insert is in the opposite orientation in pSVAdL. Nuclease S1 analysis with 5'-end-labeled probes showed that in cells transfected with pSVAdE, the late mRNA initiation sites are essentially the same as in wild type, demonstrating that an insert of 100 base pairs can have no effect on utilization of the SV40 late start sites. In pSVAdL-transfected cells, however, the major late viral initiation site is now in the insert at +1 with respect to the Ad2 major late cap site. However, all of the SV40 initiation sites are still utilized and with the same efficiency relative to each other as in wild type. Thus, it appears that the Ad2 late promoter and the SV40 late promoter can function independently on the same DNA molecule, even when one promoter is embedded within the other. By using cytosine arabinoside to block DNA replication and thereby inhibit the onset of late expression, it has been shown that both the Ad2 late promoter and the SV40 late promoter have similar requirement for DNA replication in this context. In addition, pSVAdL showed dramatically diminished virus viability and VPI expression compared with both wildtype and pSVAdE. Possible explanations for this unexpected finding are discussed.
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