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Reconstitution of yeast RNA polymerase I transcription in vitro from purified components. TATA-binding protein is not required for basal transcription.

Five purified protein components, RNA polymerase I, Rrn3p, core factor, TBP (TATA-binding protein), and upstream activation factor, are sufficient for high level transcription in vitro from the Saccharomyces cerevisiae rDNA promoter. Rrn3p and pol I form a complex in solution that is active in specific initiation. Three protein components, pol I, Rrn3p, and core factor, and promoter sequence to -38, suffice for basal transcription. Unlike pol II and pol III, yeast pol I basal transcription does not require TBP. Instead, TBP, upstream activation factor, and the upstream element of the promoter together stimulate pol I basal transcription to a fully activated level. The role of TBP in pol I transcription is fundamentally different from its role in pol II or pol III transcription.

Pubmed ID: 9837969


  • Keener J
  • Josaitis CA
  • Dodd JA
  • Nomura M


The Journal of biological chemistry

Publication Data

December 11, 1998

Associated Grants

  • Agency: NIGMS NIH HHS, Id: GM35949

Mesh Terms

  • Amino Acid Sequence
  • DNA, Ribosomal
  • DNA-Binding Proteins
  • Fungal Proteins
  • Molecular Sequence Data
  • Pol1 Transcription Initiation Complex Proteins
  • Promoter Regions, Genetic
  • RNA Polymerase I
  • Saccharomyces cerevisiae
  • Saccharomyces cerevisiae Proteins
  • TATA Box
  • TATA-Box Binding Protein
  • Transcription Factors
  • Transcription, Genetic