Balancing transcriptional interference and initiation on the GAL7 promoter of Saccharomyces cerevisiae.
Transcriptional termination of the GAL10 gene in Saccharomyces cerevisiae depends on the efficiency of polyadenylation. Either cis mutations in the poly(A) signal or trans mutations of mRNA 3' end cleavage factors result in GAL10 read-through transcripts into the adjacent GAL7 gene and inactivation (occlusion) of the GAL7 promoter. Herein, we present a molecular explanation of this transcriptional interference phenomenon. In vivo footprinting data reveal that GAL7 promoter occlusion is associated with the displacement of Gal4p transcription factors from the promoter. Interestingly, overexpression of Gal4p restores promoter occupancy, activates GAL7 expression, and rescues growth on the otherwise toxic galactose substrate. Our data therefore demonstrate a precise balance between transcriptional interference and initiation.
Greger
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IH
Sir William Dunn School of Pathology, South Parks Road, University of Oxford, Oxford OX1 3RE, United Kingdom.
Aranda
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A
Proudfoot
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N
D003470:Culture Media; D004268:DNA-Binding Proteins; D005656:Fungal Proteins / Q000235:genetics; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D016296:Mutagenesis; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000254:growth & development; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors / Q000235:genetics; D014158:Transcription, Genetic
D003470:Culture Media; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C052130:GAL4 protein, S cerevisiae; D012333:RNA, Messenger; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors