title: The TAF9 C-terminal conserved region domain is required for SAGA and TFIID promoter occupancy to promote transcriptional activation.
abstract: A common function of the TFIID and SAGA complexes, which are recruited by transcriptional activators, is to deliver TBP to promoters to stimulate transcription. Neither the relative contributions of the five shared TBP-associated factor (TAF) subunits in TFIID and SAGA nor the requirement for different domains in shared TAFs for transcriptional activation is well understood. In this study, we uncovered the essential requirement for the highly conserved C-terminal region (CRD) of Taf9, a shared TAF, for transcriptional activation in yeast. Transcriptome profiling performed under Gcn4-activating conditions showed that the Taf9 CRD is required for induced expression of ∼9% of the yeast genome. The CRD was not essential for the Taf9-Taf6 interaction, TFIID or SAGA integrity, or Gcn4 interaction with SAGA in cell extracts. Microarray profiling of a SAGA mutant (spt20Δ) yielded a common set of genes induced by Spt20 and the Taf9 CRD. Chromatin immunoprecipitation (ChIP) assays showed that, although the Taf9 CRD mutation did not impair Gcn4 occupancy, the occupancies of TFIID, SAGA, and the preinitiation complex were severely impaired at several promoters. These results suggest a crucial role for the Taf9 CRD in genome-wide transcription and highlight the importance of conserved domains, other than histone fold domains, as a common determinant for TFIID and SAGA functions.
authors.affiliation: Laboratory of Eukaryotic Gene Regulation, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India.
authors.forename: Malika
authors.initials: M
authors.lastname: Saint
authors.forename: Sonal
authors.initials: S
authors.lastname: Sawhney
authors.forename: Ishani
authors.initials: I
authors.lastname: Sinha
authors.forename: Rana Pratap
authors.initials: RP
authors.lastname: Singh
authors.forename: Rashmi
authors.initials: R
authors.lastname: Dahiya
authors.forename: Anushikha
authors.initials: A
authors.lastname: Thakur
authors.forename: Rahul
authors.initials: R
authors.lastname: Siddharthan
authors.forename: Krishnamurthy
authors.initials: K
authors.lastname: Natarajan
mesh_terms: D001119:Arginase / Q000235:genetics; D050976:Basic-Leucine Zipper Transcription Factors / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D009154:Mutation; D011401:Promoter Regions, Genetic; D060066:Protein Interaction Maps; D017434:Protein Structure, Tertiary; D012441:Saccharomyces cerevisiae / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D035381:TATA-Binding Protein Associated Factors / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D015534:Trans-Activators / Q000378:metabolism*; D035362:Transcription Factor TFIID / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015533:Transcriptional Activation
chemical_list: D050976:Basic-Leucine Zipper Transcription Factors; C501391:GCN4 protein, S cerevisiae; C507785:SAGA complex, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; C490039:TAF6 protein, S cerevisiae; C116141:TAF9 protein, S cerevisiae; D035381:TATA-Binding Protein Associated Factors; D015534:Trans-Activators; D035362:Transcription Factor TFIID; C540423:ARG1 protein, S cerevisiae; D001119:Arginase