Identification of the gene (SSU71/TFG1) encoding the largest subunit of transcription factor TFIIF as a suppressor of a TFIIB mutation in Saccharomyces cerevisiae

Zu Wen Sun, Michael Hampsey

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

Mutations in the Saccharomyces cerevisiae SSU71 gene were isolated as suppressors of a transcription factor TFIIB defect that confers both a cold-sensitive growth defect and a downstream shift in transcription start-site selection at the cyc1 locus. The ssu71-1 suppressor not only suppresses the conditional phenotype but also restores the normal pattern of transcription initiation at cyc1. In addition, the ssu71-1 suppressor confers a heat-sensitive phenotype that is dependent upon the presence of the defective form of TFIIB. Molecular and genetic analysis of the cloned SSU71 gene demonstrated that SSU71 is a single-copy essential gene encoding a highly charged protein with a molecular mass of 82,194 daltons. Comparison of the deduced Ssu71 amino acid sequence with the protein data banks revealed significant similarity to RAP74, the larger subunit of the human general transcription factor TFIIF. Moreover, Ssu71 is identical to p105, a component of yeast TFIIF. Taken together, these data demonstrate a functional interaction between TFIIB and the large subunit of TFIIF and that this interaction can affect start-site selection in vivo.

Original languageEnglish (US)
Pages (from-to)3127-3131
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume92
Issue number8
DOIs
StatePublished - Apr 11 1995

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • SSU71
  • Transcription start-site selection

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