title: Trans-activation of human immunodeficiency virus occurs via a bimodal mechanism.
abstract: A novel, highly quantitative transient expression assay based on the human interleukin-2 (IL-2) gene was used to examine the trans-activation of the Human Immunodeficiency Virus (HIV/HTLV-III/LAV/ARV) long terminal repeat (LTR) in a range of eukaryotic cell lines. In the absence of the trans-activating viral gene product, tat-III, IL-2 transcripts specific for the HIV LTR were present in low abundance in transfected cells and showed a low translational efficiency, when compared with IL-2 mRNAs transcribed from other viral promoters. Coexpression of tat-III resulted in a marked increase in the steady state level of IL-2 mRNAs transcribed from the HIV LTR, and these mRNAs also demonstrated a specific enhancement of their translational efficiency. These results suggest a bimodal mechanism of action for tat-III in the trans-activation of HIV-specific gene expression.
mesh_terms: D000818:Animals; D002460:Cell Line; D004274:DNA, Recombinant; D005786:Gene Expression Regulation; D006678:HIV / Q000235:genetics*; D006801:Humans; D007328:Insulin / Q000235:genetics; D007376:Interleukin-2 / Q000235:genetics; D011401:Promoter Regions, Genetic; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics; D012367:RNA, Viral / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics*; D014779:Virus Replication
chemical_list: D004274:DNA, Recombinant; D007328:Insulin; D007376:Interleukin-2; D012333:RNA, Messenger; D012367:RNA, Viral; D014157:Transcription Factors