title: A role for BAF57 in cell cycle-dependent transcriptional regulation by the SWI/SNF chromatin remodeling complex.
abstract: The SWI/SNF complex is an ATP-dependent chromatin remodeling complex that plays pivotal roles in gene regulation and cell cycle control. In the present study, we explored the molecular functions of the BAF57 subunit of SWI/SNF in cell cycle control via transcriptional regulation of cell cycle-related genes. We affinity purified SWI/SNF from HeLa cells stably expressing FLAG-tagged BAF47/Ini1 with or without stable short hairpin RNA-mediated knockdown of BAF57. The subunit composition of the holo-SWI/SNF and BAF57-depleted SWI/SNF complexes from these cells was determined using a quantitative SILAC (stable isotope labeling by amino acids in cell culture)-based proteomic approach. Depletion of BAF57 resulted in a significant codepletion of BAF180 from the SWI/SNF complex without decreasing total cellular BAF180 levels. In biochemical assays of SWI/SNF activity, the holo-SWI/SNF and BAF57/BAF180-depleted SWI/SNF complexes exhibited similar activities. However, in cell proliferation assays using HeLa cells, knockdown of BAF57 resulted in an accumulation of cells in the G(2)-M phase, inhibition of colony formation, and impaired growth in soft agar. Knockdown of BAF57 also caused transcriptional misregulation of various cell cycle-related genes, especially genes involved in late G(2). Collectively, our results have identified a new role for BAF57 within the SWI/SNF complex that is required for (a) maintaining the proper subunit composition of the complex and (b) cell cycle progression through the transcriptional regulation of a subset of cell cycle-related genes.
authors.affiliation: Department of Molecular Biology and Genetics and Graduate Field of Biochemistry, Molecular and Cell Biology, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Nasun
authors.initials: N
authors.lastname: Hah
authors.forename: Annemieke
authors.initials: A
authors.lastname: Kolkman
authors.forename: Donald D
authors.initials: DD
authors.lastname: Ruhl
authors.forename: W W M Pim
authors.initials: WW
authors.lastname: Pijnappel
authors.forename: Albert J R
authors.initials: AJ
authors.lastname: Heck
authors.forename: H Th Marc
authors.initials: HT
authors.lastname: Timmers
authors.forename: W Lee
authors.initials: WL
authors.lastname: Kraus
mesh_terms: D002453:Cell Cycle / Q000235:genetics*; D047369:Chromatin Immunoprecipitation; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D015972:Gene Expression Regulation, Neoplastic; D006367:HeLa Cells; D006801:Humans; D009687:Nuclear Proteins / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; C102195:PBRM1 protein, human; C504738:SMARCE1 protein, human; C445179:SWI-SNF-B chromatin-remodeling complex; D014157:Transcription Factors
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