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  • Title: Reconstitution of yeast RNA polymerase I transcription in vitro from purified components. TATA-binding protein is not required for basal transcription.
    Author: Keener J, Josaitis CA, Dodd JA, Nomura M.
    Journal: J Biol Chem; 1998 Dec 11; 273(50):33795-802. PubMed ID: 9837969.
    Abstract:
    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.
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