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. 1991 Sep;11(9):4297–4305. doi: 10.1128/mcb.11.9.4297

E1A-mediated activation of the adenovirus E4 promoter can occur independently of the cellular transcription factor E4F.

C Jones 1, K A Lee 1
PMCID: PMC361290  PMID: 1831536

Abstract

The cellular factors E4F and ATF-2 (a member of the activating transcription factor [ATF] family) bind to common sites in the adenovirus E4 promoter and have both been suggested to mediate transcriptional activation by the viral E1A protein. To assess the role of E4F, we have introduced mutations into the E4F/ATF binding sites of the E4 promoter and monitored promoter activity in HeLa cells. We find that the core motif (TGACG) of the E4F/ATF binding site is important for E4 promoter activity. However, a point mutation adjacent to the core motif that reduces E4F binding (but has no effect on ATF binding) has no effect on E4 promoter activity. Together with previous results, these findings indicate that there are at least two cellular factors (a member of the ATF family and E4F) that can function with E1A to induce transcription of the E4 promoter. We also find that certain mutations strongly reduce E4 transcription in vivo but have no effect on ATF-2 binding in vitro. These results are therefore incompatible with the possibility that (with respect to members of the ATF family) ATF-2 alone can function with E1A to transactivate the E4 promoter in HeLa cells.

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