title: Five SWI/SNF gene products are components of a large multisubunit complex required for transcriptional enhancement.
abstract: The Saccharomyces cerevisiae SWI1, SWI2 (SNF2), SWI3, SNF5, and SNF6 gene products play a crucial role in the regulation of transcription. We provide here direct biochemical evidence that all five SWI/SNF polypeptides are components of a large multisubunit complex. These five polypeptides coelute from a gel-filtration column with an apparent molecular mass of approximately 2 MDa. The five SWI/SNF polypeptides do not copurify when extracts are prepared from swi- or snf- mutants. We show that SWI/SNF polypeptides also remain associated during an affinity-chromatography step followed by gel filtration. Assembly of the SWI/SNF complex is not disrupted by a mutation in the putative APT-binding site of SWI2, although this mutation eliminates SWI2 function.
authors.affiliation: Program in Molecular Medicine, University of Massachussetts Medical Center, Worcester 01605.
authors.forename: C L
authors.initials: CL
authors.lastname: Peterson
authors.forename: A
authors.initials: A
authors.lastname: Dingwall
authors.forename: M P
authors.initials: MP
authors.lastname: Scott
mesh_terms: D000251:Adenosine Triphosphatases; D000255:Adenosine Triphosphate / Q000378:metabolism; D002846:Chromatography, Affinity; D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins / Q000502:physiology; D003852:Deoxyribonucleoproteins / Q000737:chemistry*; D005656:Fungal Proteins / Q000502:physiology; D046911:Macromolecular Substances; D009687:Nuclear Proteins / Q000502:physiology; D011485:Protein Binding; D000071796:SMARCB1 Protein; D012441:Saccharomyces cerevisiae / Q000737:chemistry / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors / Q000502:physiology; D014158:Transcription, Genetic
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D003852:Deoxyribonucleoproteins; D005656:Fungal Proteins; D046911:Macromolecular Substances; D009687:Nuclear Proteins; D000071796:SMARCB1 Protein; C513266:SMARCB1 protein, human; C066190:SNF5 protein, S cerevisiae; C078562:SWI1 protein, S cerevisiae; C072981:SWI3 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; C499333:SNF2 protein, S cerevisiae