SAGA Is a General Cofactor for RNA Polymerase II Transcription.
Prior studies suggested that SAGA and TFIID are alternative factors that promote RNA polymerase II transcription, with about 10% of genes in S. cerevisiae dependent on SAGA. We reassessed the role of SAGA by mapping its genome-wide location and role in global transcription in budding yeast. We find that SAGA maps ... to the UAS elements of most genes, overlapping with Mediator binding and irrespective of previous designations of SAGA- or TFIID-dominated genes. Disruption of SAGA through mutation or rapid subunit depletion reduces transcription from nearly all genes, measured by newly synthesized RNA. We also find that the acetyltransferase Gcn5 synergizes with Spt3 to promote global transcription and that Spt3 functions to stimulate TBP recruitment at all tested genes. Our data demonstrate that SAGA acts as a general cofactor required for essentially all RNA polymerase II transcription and is not consistent with the previous classification of SAGA- and TFIID-dominated genes.
Mesh Terms:
Gene Deletion, Gene Expression Regulation, Fungal, Histone Acetyltransferases, Promoter Regions, Genetic, Protein Subunits, RNA Polymerase II, RNA, Fungal, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, TATA-Binding Protein Associated Factors, TATA-Box Binding Protein, Trans-Activators, Transcription Factors, Transcription, Genetic
Gene Deletion, Gene Expression Regulation, Fungal, Histone Acetyltransferases, Promoter Regions, Genetic, Protein Subunits, RNA Polymerase II, RNA, Fungal, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, TATA-Binding Protein Associated Factors, TATA-Box Binding Protein, Trans-Activators, Transcription Factors, Transcription, Genetic
Mol. Cell
Date: Oct. 05, 2017
PubMed ID: 28918903
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