Molecular cloning and analysis of Schizosaccharomyces pombe Reb1p: sequence-specific recognition of two sites in the far upstream rDNA intergenic spacer.
The coding sequences for a Schizosaccharomyces pombe sequence-specific DNA binding protein, Reb1p, have been cloned. The predicted S. pombe Reb1p is 24-29% identical to mouse TTF-1 (transcription termination factor-1) and Saccharomyces cerevisiae REB1 protein, both of which direct termination of RNA polymerase I catalyzed transcripts. The S.pombe Reb1 cDNA encodes a predicted polypeptide of 504 amino acids with a predicted molecular weight of 58.4 kDa. The S. pombe Reb1p is unusual in that the bipartite DNA binding motif identified originally in S.cerevisiae and Klyveromyces lactis REB1 proteins is uninterrupted and thus S.pombe Reb1p may contain the smallest natural REB1 homologous DNA binding domain. Its genomic coding sequences were shown to be interrupted by two introns. A recombinant histidine-tagged Reb1 protein bearing the rDNA binding domain has two homologous, sequence-specific binding sites in the S. pomber DNA intergenic spacer, located between 289 and 480 nt downstream of the end of the approximately 25S rRNA coding sequences. Each binding site is 13-14 bp downstream of two of the three proposed in vivo termination sites. The core of this 17 bp site, AGGTAAGGGTAATGCAC, is specifically protected by Reb1p in footprinting analysis.
Zhao
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Department of Chemistry, New York University 10003, USA.
Guo
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Liu
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Pape
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D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence / Q000187:drug effects; D003001:Cloning, Molecular; D017124:Conserved Sequence; D004275:DNA, Ribosomal / Q000235:genetics* / Q000494:pharmacology; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D003850:Deoxyribonuclease I / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D005656:Fungal Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D051379:Mice; D008969:Molecular Sequence Data; D010454:Peptide Termination Factors / Q000235:genetics; D011485:Protein Binding / Q000235:genetics; D012318:RNA Polymerase I / Q000037:antagonists & inhibitors / Q000235:genetics; D012568:Schizosaccharomyces / Q000737:chemistry / Q000235:genetics*; D029702:Schizosaccharomyces pombe Proteins; D013045:Species Specificity; D014157:Transcription Factors; D014158:Transcription, Genetic / Q000187:drug effects
D004275:DNA, Ribosomal; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D010454:Peptide Termination Factors; D029702:Schizosaccharomyces pombe Proteins; D014157:Transcription Factors; C504004:Ttf1 protein, mouse; C512907:reb1 protein, S pombe; D012318:RNA Polymerase I; D003850:Deoxyribonuclease I