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To identify the adenovirus-5 EIII promoter sequences that are involved in basal level of transcription, a series of promoter deletion mutants were analyzed in vivo by transfection into HeLa cells and in vitro using a HeLa whole cell extract system. Three regions within the EIII promoter were shown to be important for efficient transcription: the TATA sequence, an upstream element centered at -55/-57, and an additional element located between -111 and -233. In vivo transcriptional analysis of EIII promoter deletions in the presence of adenovirus EIa gene products have demonstrated that the same three regions are required for EIa-stimulated transcription. We conclude that there is no sequence element in the EIII promoter between -15 and -233 that is uniquely required for the stimulation of EIII transcription by EIa gene products.

Transcriptional analysis of the adenovirus-5 EIII promoter: absence of sequence specificity for stimulation by EIa gene products