title: Characterization of the fission yeast ribosomal DNA binding factor: components share homology with Upstream Activating Factor and with SWI/SNF subunits.
abstract: A ribosomal DNA (rDNA) binding activity was previously characterized in fission yeast that recognized the upstream ribosomal RNA (rRNA) gene promoter in a sequence specific manner and which stimulated rRNA synthesis. It was found to share characteristics with Saccharomyces cerevisiae's Upstream Activating Factor (UAF), an RNA polymerase I (pol I) specific transcription stimulatory factor. Putative fission yeast homologs of the S.cerevisiae UAF subunits, Rrn5p and Rrn10p, were identified. The Schizosaccharomyces pombe rDNA binding activity/transcriptional stimulatory activity was found to co-fractionate with both SpRrn5h and SpRrn10h. Analysis of polypeptides interacting with SpRrn10h uncovered a 27 kDa polypeptide (Spp27) homologous to a SWI/SNF component (now known to be homologous to Uaf30p). The contributions of the S.pombe and S.cerevisiae upstream rDNA promoter domains were assessed in cross-species transcriptional assays. Furthermore, comparative genomic analysis revealed putative Rrn5p, Rrn10p, Rrn9p and p27 homologs in multiple non-vertebrates. The S.pombe rDNA binding activity is proposed to be an RNA pol I specific SWI/SNF type factor.
authors.affiliation: Department of Chemistry, New York University, New York, NY 10003, USA.
authors.forename: Meilin
authors.initials: M
authors.lastname: Liu
authors.forename: Ailan
authors.initials: A
authors.lastname: Guo
authors.forename: Boris
authors.initials: B
authors.lastname: Boukhgalter
authors.forename: Kaitlin
authors.initials: K
authors.lastname: Van Den Heuvel
authors.forename: Matthew
authors.initials: M
authors.lastname: Tripp
authors.forename: Louise
authors.initials: L
authors.lastname: Pape
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D018797:Cell Cycle Proteins; D002458:Cell Fractionation; D002868:Chromosomal Proteins, Non-Histone; D004275:DNA, Ribosomal / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D024202:Electrophoretic Mobility Shift Assay; D008969:Molecular Sequence Data; D011485:Protein Binding; D012441:Saccharomyces cerevisiae / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D012568:Schizosaccharomyces / Q000235:genetics*; D029702:Schizosaccharomyces pombe Proteins; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic; D020798:Two-Hybrid System Techniques
chemical_list: D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; D004275:DNA, Ribosomal; D004268:DNA-Binding Proteins; C098779:RRN10 protein, S cerevisiae; C098777:RRN5 protein, S cerevisiae; C078562:SWI1 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; D014157:Transcription Factors; C513096:swi1 protein, S pombe; C402483:upstream activation factor, S cerevisiae