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Research Papers
Fred Hutchinson Cancer Research Center, Seattle, Washington 98104-2092.
Abstract
A suppressor gene was identified, which in high copy number rescues a temperature-sensitive mutation in yeast TATA-binding protein (TBP). Suppression was allele specific because the suppressor did not rescue the temperature-sensitive phenotype of another TBP mutant. This suppressor gene encodes a 596-amino-acid protein of which the amino-terminal half is homologous to the Pol II-specific factor TFIIB. Disruption of this gene, termed BRF1, showed it to be essential for growth of yeast. Deletion of sequences at either the amino or carboxyl terminus of BRF1 gave both temperature- and cold-sensitive phenotypes. These temperature- and cold-sensitive strains were used to prepare extracts deficient in BRF1 activity and were tested for transcriptional activity by RNA polymerases I, II, and III in vitro. BRF1-deficient extracts are defective in Pol III transcription and can be reconstituted for Pol III transcription by the addition of recombinant BRF1. Western analysis shows that BRF1 is present in TFIIIB but not the TFIIIC fraction, suggesting that it is a component of TFIIIB. We propose that BRF1 plays a role in Pol III initiation analogous to the role played by TFIIB for Pol II in its interaction with TBP and polymerase. The identification of a Pol III-specific TFIIB-like factor extends the previously noted similarity of transcriptional initiation by the three nuclear polymerases.
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