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- W2154689716 abstract "SAGA is a 1.8-MDa yeast protein complex that is composed of several distinct classes of transcription-related factors, including the adaptor/acetyltransferase Gcn5, Spt proteins, and a subset of TBP-associated factors. Our results indicate that mutations that completely disrupt SAGA (deletions of SPT7 orSPT20) strongly reduce transcriptional activation at theHIS3 and TRP3 genes and that Gcn5 is required for normal HIS3 transcriptional start site selection. Surprisingly, mutations in Spt proteins involved in the SAGA-TBP interaction (Spt3 and Spt8) cause derepression of HIS3 andTRP3 transcription in the uninduced state. Consistent with this finding, wild-type SAGA inhibits TBP binding to theHIS3 promoter in vitro, while SAGA lacking Spt3 or Spt8 is not inhibitory. We detected two distinct forms of SAGA in cell extracts and, strikingly, one lacks Spt8. Conditions that induceHIS3 and TRP3 transcription result in an altered balance between these complexes strongly in favor of the form without Spt8. These results suggest that the composition of SAGA may be dynamic in vivo and may be regulated through dissociable inhibitory subunits." @default.
- W2154689716 created "2016-06-24" @default.
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- W2154689716 date "2000-01-15" @default.
- W2154689716 modified "2023-10-12" @default.
- W2154689716 title "Inhibition of TATA-Binding Protein Function by SAGA Subunits Spt3 and Spt8 at Gcn4-Activated Promoters" @default.
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- W2154689716 doi "https://doi.org/10.1128/mcb.20.2.634-647.2000" @default.
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