ABF1 binding sites in yeast RNA polymerase genes.
We have used gel retardation and DNase protection assays to investigate the trans-acting factors involved in the regulation of yeast RNA polymerase genes RPC160 and RPC40. The same binding component was found to interact with the promoter of the two genes, at a short distance (100-150 base pairs) from the transcription start sites. From its size, its DNA-binding specificity and its immunological properties, this factor appears to correspond to the autonomous replication sequences and silencer-binding factor ABF1/SBF-B. The interaction of ABF1 with the polymerase upstream box sequence was characterized using gel DNA-binding assay. The factor binds with high affinity to the polymerase upstream box sequence (Kapp = 5.10(-10) M). A mutational analysis showed that nine base pairs belonging to two separated attachment sites are involved in factor binding. The consensus sequence RTCRYB(N)4ACG was derived from the present binding studies. These data provide an experimental basis for evaluating the efficiency of known or potential ABF1 sites and for comparing several factors with ABF1-like binding properties.
Département de Biologie, Centre d'Etudes Nucléaires de Saclay, Gif-sur-Yvette, France.
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Della Seta
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Treich
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JM
Buhler
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Sentenac
D000595:Amino Acid Sequence; D001483:Base Sequence; D004271:DNA, Fungal / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D012321:DNA-Directed RNA Polymerases / Q000235:genetics*; D005656:Fungal Proteins / Q000378:metabolism*; D005800:Genes, Fungal; D007700:Kinetics; D008969:Molecular Sequence Data; D009154:Mutation; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors
C061886:ABF1 protein, S cerevisiae; D004271:DNA, Fungal; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D012321:DNA-Directed RNA Polymerases