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Nucleic Acids Research, Vol 25, Issue 8 1633-1640, Copyright © 1997 by Oxford University Press

ARTICLES

An immunoaffinity purified Schizosaccharomyces pombe TBP-containing complex directs correct initiation of the S.pombe rRNA gene promoter

L Chen, A Guo and L Pape
Department of Chemistry, New York University, New York, NY 10003, USA.

The multi-protein complex SL1, containing TBP, which is essential for RNA polymerase I catalyzed transcription, has been analyzed in fission yeast. It was immunopurified based on association of component subunits with epitope-tagged TBP. To enable this analysis, a strain of Schizosaccharomyces pombe was created where the only functional TBP coding sequences were those of FLAG-TBP. RNA polymerase I transcription components were fractionated from this strain and the TBP-associated polypeptides were subsequently immunopurified together with the epitope- tagged TBP. An assessment of the activity of this candidate SL1 complex was undertaken cross-species. This fission yeast TBP-containing complex displays two activities in redirecting transcriptional initiation of an S. pombe rDNA gene promoter cross-species in Saccharomyces cerevisiae transcription reactions: it both blocks an incorrect transcriptional start site at +7 and directs initiation at the correct site for S. pombe rRNA synthesis. This complex is essential for accurate initiation of the S.pombe rRNA gene: rRNA synthesis is reconstituted when this S.pombe TBP-containing complex is combined with a S.pombe fraction immunodepleted of TBP.
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