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Mapping the principal interaction site of the Brf1 and Bdp1 subunits of Saccharomyces cerevisiae TFIIIB.

J Biol Chem. 2006 May 19;281(20):14321-9. Epub 2006 Mar 21
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摘要


The Brf1 subunit of the central RNA polymerase (pol) III transcription initiation factor TFIIIB is bipartite; its N-terminal TFIIB-related half is principally responsible for recruiting pol III to the promoter and for promoter opening near the transcriptional start site, whereas its pol III-specific C-terminal half contributes most of the affinities that hold the three subunits of TFIIIB together. Here, the principal attachment site of Brf1 for the Bdp1 subunit of TFIIIB has been mapped by a combination of structure-informed, site-directed mutagenesis and photochemical protein-DNA cross-linking. A 66-amino acid segment of Brf1 is shown to serve as a two-sided adhesive surface, with the side chains projecting away from its extended interface with TATA-binding protein anchoring Bdp1 binding. An extensive collection of N-terminal, C-terminal, and internal deletion proteins has been used to demarcate the interacting Bdp1 domain to a 66-amino acid segment that includes the SANT domain of this subunit and is phylogenetically the most conserved region of Bdp1.

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