Tight cooperation between Mot1p and NC2β in regulating genome-wide transcription, repression of transcription following heat shock induction and genetic interaction with SAGA

• Published in: Nucleic acids research 2012-02, Vol.40 (3), p.996-1008
• Main Authors: Spedale, Gianpiero, Meddens, Claartje A., Koster, Maria J. E., Ko, Cheuk W., van Hooff, Sander R., Holstege, Frank C. P., Timmers, H. Th. Marc, Pijnappel, W. W. M. Pim
• Format: Article
• Language: English
• Subjects: Adenosine Triphosphatases - genetics; Adenosine Triphosphatases - metabolism; Cell Nucleus - metabolism; Cooperation; DNA-directed RNA polymerase; Gene Expression Regulation, Fungal; Gene Regulation, Chromatin and Epigenetics; Genome, Fungal; Heat shock; Heat-Shock Proteins - metabolism; Heat-Shock Response; Lethality; Promoter Regions, Genetic; Promoters; Recruitment; Repressor Proteins - genetics; Repressor Proteins - metabolism; RNA; RNA Polymerase II - metabolism; Saccharomyces cerevisiae Proteins - genetics; Saccharomyces cerevisiae Proteins - metabolism; Stress; TATA-binding protein; TATA-Binding Protein Associated Factors - genetics; TATA-Binding Protein Associated Factors - metabolism; TFIID protein; Trans-Activators - genetics; Transcription; Transcription factors; Transcription initiation; Transcription, Genetic
• ISSN: 0305-1048; 1362-4962
• DOI: 10.1093/nar/gkr784

TATA-binding protein (TBP) is central to the regulation of eukaryotic transcription initiation. Recruitment of TBP to target genes can be positively regulated by one of two basal transcription factor complexes: SAGA or TFIID. Negative regulation of TBP promoter association can be performed by Mot1p or the NC2 complex. Recent evidence suggests that Mot1p, NC2 and TBP form a DNA-dependent protein complex. Here, we compare the functions of Mot1p and NC2βduring basal and activated transcription using the anchor-away technique for conditional nuclear depletion. Genome-wide expression analysis indicates that both proteins regulate a highly similar set of genes. Upregulated genes were enriched for SAGA occupancy, while downregulated genes preferred TFIID binding. Mot1p and NC2β depletion during heat shock resulted in failure to downregulate gene expression after initial activation, which was accompanied by increased TBP and RNA pol II promoter occupancies. Depletion of Mot1p or NC2β displayed preferential synthetic lethality with the TBP-interaction module of SAGA. Our results support the model that Mot1p and NC2β directly cooperate in vivo to regulate TBP function, and that they are involved in maintaining basal expression levels as well as in resetting gene expression after induction by stress.