Abstract
Among eukaryotic transcription trans-activators, the human immunodeficiency virus type 1 (HIV-1) Tat protein is exceptional in that its target site TAR is an RNA rather than a DNA sequence. Here, we confirm that fusion of Tat to the RNA-binding domain of the HIV-1 Rev protein permits the efficient activation of an HIV-1 long terminal repeat (LTR) promoter in which critical TAR sequences have been replaced by RNA sequences derived from the HIV-1 Rev response element (RRE). An RRE target sequence as small as 13 nucleotides is shown to form an effective in vivo target for Rev binding. More important, a fusion protein consisting of Rev attached to the VP16 transcription activation domain was also observed to efficiently activate the HIV-1 LTR from this nascent RNA target. These data demonstrate that trans-activation of transcription by acidic activation domains does not require a stable interaction with the promoter DNA and suggest that VP16, like Tat, can act on steps subsequent to the formation of the HIV-1 LTR preinitiation complex. The finding that the activation domains of VP16 and Tat are functionally interchangeable raises the possibility that these apparently disparate viral trans-activators may nevertheless act via similar mechanisms.
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Dates
Type | When |
---|---|
Created | 18 years, 2 months ago (June 5, 2007, 5:15 p.m.) |
Deposited | 3 years, 9 months ago (Nov. 13, 2021, 11:28 p.m.) |
Indexed | 1 week, 1 day ago (Aug. 27, 2025, 11:51 a.m.) |
Issued | 32 years, 10 months ago (Nov. 1, 1992) |
Published | 32 years, 10 months ago (Nov. 1, 1992) |
Published Online | 32 years, 10 months ago (Nov. 1, 1992) |
Published Print | 32 years, 10 months ago (Nov. 1, 1992) |
@article{Tiley_1992, title={The VP16 transcription activation domain is functional when targeted to a promoter-proximal RNA sequence.}, volume={6}, ISSN={1549-5477}, url={http://dx.doi.org/10.1101/gad.6.11.2077}, DOI={10.1101/gad.6.11.2077}, number={11}, journal={Genes & Development}, publisher={Cold Spring Harbor Laboratory}, author={Tiley, L S and Madore, S J and Malim, M H and Cullen, B R}, year={1992}, month=nov, pages={2077–2087} }