title: Transcriptional corepression in vitro: a Mot1p-associated form of TATA-binding protein is required for repression by Leu3p.
abstract: Signals from transcriptional activators to the general mRNA transcription apparatus are communicated by factors associated with RNA polymerase II or the TATA-binding protein (TBP). Currently, little is known about how gene-specific transcription repressors communicate with RNA polymerase II. We have analyzed the requirements for repression by the saccharomyces cerevisiae Leu3 protein (Leu3p) in a reconstituted transcription system. We have identified a complex form of TBP which is required for communication of the repressing signal. This TFIID-like complex contains a known TBP-associated protein, Mot1p, which has been implicated in the repression of a subset of yeast genes by genetic analysis. Leu3p-dependent repression can be reconstituted with purified Mot1p and recombinant TBP. In addition, a mutation in the Mot1 gene leads to partial derepression of the Leu3p-dependent LEU2 promoter. These in vivo and in vitro observations define a role for Mot1p as a transcriptional corepressor.
authors.affiliation: Department of Biochemistry, Biophysics and Genetics, University of Colorado Health Sciences Center, Denver, 80262, USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Wade
authors.forename: J A
authors.initials: JA
authors.lastname: Jaehning
mesh_terms: D000251:Adenosine Triphosphatases; D004265:DNA Helicases / Q000235:genetics* / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D009154:Mutation; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics* / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D016385:TATA Box; D035381:TATA-Binding Protein Associated Factors; D035181:TATA-Box Binding Protein; D015534:Trans-Activators / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C063667:LEU3 protein, S cerevisiae; D011994:Recombinant Proteins; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D035381:TATA-Binding Protein Associated Factors; D035181:TATA-Box Binding Protein; D015534:Trans-Activators; D014157:Transcription Factors; D000251:Adenosine Triphosphatases; C073676:MOT1 protein, S cerevisiae; D004265:DNA Helicases