title: Transcriptional activity of the human immunodeficiency virus-1 LTR promoter in fission yeast Schizosaccharomyces pombe.
abstract: We have analyzed the transcriptional activity of the human immunodeficiency virus type I (HIV-1) LTR promoter in the fission yeast Schizosaccharomyces pombe (S.pombe). The ability of a series of 5'-deleted forms of the HIV-1 LTR promoter to direct transcription of the chloramphenicol acetyltransferase reporter gene was studied. We found that the HIV-1 promoter is functional in S.pombe and that deletion of sequences upstream of the NF-kB binding site previously identified to contain the negative regulatory element (NRE) in mammalian cells, resulted in about thirty-fold increase in transcriptional activity. Sequences in the HIV-1 promoter that bind NF-kB were found to be essential for transcriptional activation in S.pombe. In mammalian cells, transactivation of the HIV-1 LTR requires TAR sequences and the viral Tat protein. In fission yeast, Tat failed to transactivate the HIV-1 LTR, suggesting that S.pombe may lack a cellular factor(s) required for the Tat transactivation process.
authors.affiliation: Laboratory of Molecular Virology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.
authors.forename: R
authors.initials: R
authors.lastname: Toyama
authors.forename: S M
authors.initials: SM
authors.lastname: Bende
authors.forename: R
authors.initials: R
authors.lastname: Dhar
mesh_terms: D001483:Base Sequence; D015152:Blotting, Northern; D015696:Gene Products, tat / Q000378:metabolism; D016325:HIV Long Terminal Repeat / Q000235:genetics*; D015497:HIV-1 / Q000235:genetics*; D008969:Molecular Sequence Data; D016328:NF-kappa B / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012568:Schizosaccharomyces / Q000235:genetics*; D014158:Transcription, Genetic / Q000235:genetics*; D015533:Transcriptional Activation / Q000235:genetics; D014170:Transformation, Genetic / Q000235:genetics; D054322:tat Gene Products, Human Immunodeficiency Virus
chemical_list: D015696:Gene Products, tat; D016328:NF-kappa B; D011993:Recombinant Fusion Proteins; D054322:tat Gene Products, Human Immunodeficiency Virus