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• W2105144789 endingPage "4918" @default.
• W2105144789 startingPage "4910" @default.
• W2105144789 abstract "It has previously been shown that the human immunodeficiency virus type 1 (HIV-1) trans-activation-responsive region (TAR) is contained in a stem-loop RNA structure. Moreover, the interaction of the RNA secondary structure with Tat, the trans-activator protein, seems to play a role in activation of transcription initiation and in preventing transcription attenuation. In this work, we have studied the ability of the HIV-1 TAR stem-loop to act as a specific attenuation signal for highly purified RNA polymerase II. We developed an in vitro system using dC-tailed DNA fragments of HIV-1 to study transcriptional control in the HIV-1 LTR. We have found that transcription in this system yields an attenuator RNA whose 3' end maps to the end of the TAR stem-loop, approximately 60 to 65 nucleotides downstream of the in vivo initiation site. Furthermore, transcription attenuation occurs only under conditions which cause displacement of the nascent transcript from the template DNA strand, thus allowing the RNA to fold into secondary structure. Evidence is provided that the purified polymerase II indeed recognizes stable RNA secondary structure as an intrinsic attenuation signal. The existence of this signal in the TAR stem-loop suggests that in vivo an antiattenuation factor, probably Tat, alone or in combination with other factors, acts to relieve the elongation block at the HIV-1 attenuation site." @default.
• W2105144789 created "2016-06-24" @default.
• W2105144789 creator A5016279757 @default.
• W2105144789 creator A5075946063 @default.
• W2105144789 date "1991-09-01" @default.
• W2105144789 modified "2023-09-24" @default.
• W2105144789 title "Transcriptional elongation by purified RNA polymerase II is blocked at the trans-activation-responsive region of human immunodeficiency virus type 1 in vitro" @default.
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• W2105144789 doi "https://doi.org/10.1128/jvi.65.9.4910-4918.1991" @default.
• W2105144789 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/248952" @default.
• W2105144789 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1870206" @default.
• W2105144789 hasPublicationYear "1991" @default.
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