title: Nucleosome disruption by transcription factor binding in yeast.
abstract: Studies in vivo and in vitro have shown that the packaging of DNA into chromatin can affect gene expression. Here, binding of the yeast transcriptional activator GAL4 to DNA in chromatin has been investigated in vivo with a yeast episome. A positioned nucleosome that is present in cells grown in glucose and contains a single GAL4 binding site is disrupted by GAL4 binding in galactose. GAL4 can also bind to DNA in chromatin when the carboxyl-terminal activation domain of GAL4 is either masked by GAL80 or is absent. These results show that a transcription factor can bind to its site in vivo in what would appear to be a repressive chromatin structure.
authors.affiliation: Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892.
authors.forename: R H
authors.initials: RH
authors.lastname: Morse
mesh_terms: D001483:Base Sequence; D001665:Binding Sites; D004268:DNA-Binding Proteins / Q000378:metabolism*; D005656:Fungal Proteins / Q000378:metabolism*; D005690:Galactose / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D008969:Molecular Sequence Data; D009707:Nucleosomes / Q000378:metabolism*; D010957:Plasmids; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C052130:GAL4 protein, S cerevisiae; D009707:Nucleosomes; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D005947:Glucose; D005690:Galactose