A DNA binding factor (UBF) interacts with a positive regulatory element in the promoters of genes expressed during meiosis and vegetative growth in yeast.
We have studied the bipartite regulatory element UASH/URS1 in the promoter of HOP1, whose product is required for synapsis and correct pairing of homologous chromosomes during the first meiotic division. HOP1 is transcriptionally repressed by the URS1 motif during vegetative growth and induced during meiotic prophase by the UASH motif in cooperation with the bifunctional URS1 site, which is required for full induction of HOP1. While URS1 is bound in vitro by the Buf and Ume6 repressor proteins, we demonstrate for the first time by electrophoretic mobility shift assays and interference footprinting that the UASH site interacts in vitro with a novel factor called UBF (UASH binding factor) which is present in haploid and diploid cycling, as well as sporulating cells. Point mutations in the HOP1 UASH motif abolish UBF-dependent DNA binding activity in vitro and meiotic HOP1 gene expression in vivo. Furthermore, we show that UBF binds in vitro to UASH-like sequences in the promoter regions of several meiosis-specific and non-specific genes and propose that UBF mediates gene expression through its interaction with the UASH motif in both cycling and sporulating cells.
Prinz
S
S
Institut für Botanik, Abteilung für Cytologie und Cytogenetik, Vienna, Austria.
Klein
F
F
Auer
H
H
Schweizer
D
D
Primig
M
M
D001483:Base Sequence; D016384:Consensus Sequence; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism*; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D008540:Meiosis; D008938:Mitosis; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics; D009838:Oligodeoxyribonucleotides / Q000737:chemistry; D017354:Point Mutation; D035463:Pol1 Transcription Initiation Complex Proteins; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D013172:Spores, Fungal; D014157:Transcription Factors / Q000378:metabolism*
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C086672:HOP1 protein, S cerevisiae; C080326:IME1 protein, S cerevisiae; D009687:Nuclear Proteins; D009838:Oligodeoxyribonucleotides; D035463:Pol1 Transcription Initiation Complex Proteins; D012333:RNA, Messenger; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; C090118:Zip1 protein, S cerevisiae; C063844:transcription factor UBF