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. 1986 Nov;6(11):3596–3605. doi: 10.1128/mcb.6.11.3596

Activation of the adenovirus and BK virus late promoters: effects of the BK virus enhancer and trans-acting viral early proteins.

B W Grinnell, D T Berg, J Walls
PMCID: PMC367119  PMID: 3025602

Abstract

We have examined the activation of the adenovirus major late promoter (MLP) by the cis-acting enhancer element of the human polyomavirus BK and by the trans-acting simian virus 40 (SV40) T antigen and adenovirus E1A proteins. By using chloramphenicol acetyltransferase expression vectors, we found that the MLP (pLP-CAT) was trans-activated in human and monkey kidney cells expressing the SV40 T antigen. In addition, the MLP could be cis-activated by the BK virus enhancer in both human and monkey kidney cells; approximately 20 times more chloramphenicol acetyltransferase was produced from expression vectors containing a hybrid promoter (BL), in which the BK enhancer was upstream of the MLP, than from expression vectors containing the MLP alone. This same level of enhancement of the MLP by the BK enhancer was observed in cells expressing the T antigen of SV40. However, in the 293 cell line, greater enhancement of MLP activity (70-fold) was observed with the BK enhancer sequence. In contrast, MLP activity in the 293 cell line was unchanged by the SV40 enhancer. In cotransfection experiments, MLP activity, augmented by the BK enhancer, could be further stimulated with a plasmid coding for the E1A gene products. By creating deletion mutants, we determined that the high-level activation of the hybrid BL transcriptional unit by the E1A proteins requires both MLP sequences and an intact BK virus enhancer. On the other hand, activation of the BL transcriptional unit by the T antigen did not require an intact enhancer sequence. Our results suggest that the SV40 T antigen and E1A proteins trans-activate the BL promoter by different mechanisms. We also demonstrate in cotransfection experiments that the BK late promoter is activated 45-fold by the SV40 T antigen.

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Selected References

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