title: Mot1 activates and represses transcription by direct, ATPase-dependent mechanisms.
abstract: Mot1 is an essential yeast Snf2/Swi2-related ATPase that exerts both positive and negative effects on gene expression. In vitro, Mot1 can disrupt TATA-binding protein-DNA complexes in an ATP-dependent reaction. This activity can explain Mot1-mediated transcriptional repression, but how Mot1 activates transcription is unknown. We demonstrate that, remarkably, Mot1 is localized in vivo to promoters for both Mot1-repressed and Mot1-activated genes. Moreover, Mot1 ATPase activity is required for both activation and repression of gene activity. These findings suggest a novel function for the Mot1 ATPase at activated genes, perhaps involving ATP-driven reorganization of the preinitiation complex. Mot1 regulates the expression of approximately 3% of yeast genes in cells grown in rich medium. Most of these genes are repressed by Mot1, consistent with Mot1's ATP-dependent TATA-binding protein-DNA dissociating activity. Additionally, approximately 77% of the Mot1-repressed genes are involved in the diauxic shift, stress response, mating, or sporulation. The gene sets controlled by NC2 and Srb10 are strongly correlated with the Mot1-controlled set, suggesting that these factors cooperate in transcriptional control on a global scale.
authors.affiliation: Department of Biochemistry and Molecular Genetics, University of Virginia Health System, 1300 Jefferson Park Avenue, Room 6213, Charlottesville, VA 22908-0733, USA.
authors.forename: Arindam
authors.initials: A
authors.lastname: Dasgupta
authors.forename: Russell P
authors.initials: RP
authors.lastname: Darst
authors.forename: Karla J
authors.initials: KJ
authors.lastname: Martin
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Afshari
authors.forename: David T
authors.initials: DT
authors.lastname: Auble
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D002843:Chromatin / Q000378:metabolism; D004265:DNA Helicases / Q000378:metabolism*; D005656:Fungal Proteins / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D020411:Oligonucleotide Array Sequence Analysis; D012097:Repressor Proteins / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D035381:TATA-Binding Protein Associated Factors; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D002843:Chromatin; D005656:Fungal Proteins; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D035381:TATA-Binding Protein Associated Factors; D015534:Trans-Activators; D014157:Transcription Factors; D000251:Adenosine Triphosphatases; C073676:MOT1 protein, S cerevisiae; D004265:DNA Helicases