title: A complex composed of tup1 and ssn6 represses transcription in vitro.
abstract: The Saccharomyces cerevisiae Tup1 protein is a member of a family of WD repeat containing proteins that are involved in repression of transcription. Tup1, along with the Ssn6 protein, represses a wide variety of genes in yeast including cell type-specific and glucose-repressed genes. Tup1 and Ssn6 are recruited to these specific gene sets by interaction with sequence-specific DNA binding proteins. In this work, a protein complex containing Ssn6 and Tup1 was purified to determine its composition. The size of the complex is estimated to be 440 kDa. Tup1 and Ssn6, which are both phosphoproteins, are the only proteins present in stoichiometric amounts in the complex. We also demonstrate that this purified complex represses transcription in an in vitro assay.
authors.affiliation: Department of Biochemistry and Biophysics, University of California, San Francisco, California 94143-0414, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Redd
authors.forename: M B
authors.initials: MB
authors.lastname: Arnaud
authors.forename: A D
authors.initials: AD
authors.lastname: Johnson
mesh_terms: D002474:Cell-Free System; D004268:DNA-Binding Proteins; D005656:Fungal Proteins / Q000302:isolation & purification / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal; D008970:Molecular Weight; D009687:Nuclear Proteins; D010750:Phosphoproteins / Q000302:isolation & purification / Q000378:metabolism; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012097:Repressor Proteins / Q000302:isolation & purification / Q000378:metabolism*; D012441:Saccharomyces cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014158:Transcription, Genetic
chemical_list: C065455:CYC8 protein, S cerevisiae; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D009687:Nuclear Proteins; D010750:Phosphoproteins; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; C066502:TUP1 protein, S cerevisiae