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• W4231230519 endingPage "237" @default.
• W4231230519 startingPage "226" @default.
• W4231230519 abstract "Mutations in the Saccharomyces cerevisiae sua8 gene were found to be suppressors of an aberrant ATG translation initiation codon in the leader region of the cyc1 gene. Analysis of cyc1 transcripts from sua8 mutants revealed that suppression is a consequence of diminished transcription initiation at the normal start sites in favor of initiation at downstream sites, including a site between the aberrant and normal ATG start codons. This effect is not cyc1 gene specific since initiation at other genes, including ADH1, CYC7, and HIS4, was similarly affected, although initiation at HIS3 and SPT15 was unaffected. The SUA8 gene was cloned and partially sequenced, revealing identity to RPB1, which encodes the largest subunit of RNA polymerase II. The sua8 suppressors are the result of single amino acid replacements of highly conserved residues. Three replacements were found either within or immediately preceding homology block D, and a fourth was found adjacent to homology block H, indicating that these regions play a role in defining start sites in vivo. Nearly identical effects on start site selection were observed for sua7 suppressors, which encode altered forms of TFIIB. Synthetic lethality was associated with double sua7 sua8 suppressor mutations, and recessive sua7 mutants failed to fully complement recessive sua8 mutants in heterozygous diploids (nonallelic noncomplementation). These data indicate that the largest subunit of RNA polymerase II and TFIIB are important determinants of transcription start site selection in S. cerevisiae and suggest that this function might be conferred by interaction between these two proteins." @default.
• W4231230519 created "2022-05-12" @default.
• W4231230519 creator A5053488552 @default.
• W4231230519 creator A5066517934 @default.
• W4231230519 creator A5071495460 @default.
• W4231230519 date "1994-01-01" @default.
• W4231230519 modified "2023-10-03" @default.
• W4231230519 title "The sua8 suppressors of Saccharomyces cerevisiae encode replacements of conserved residues within the largest subunit of RNA polymerase II and affect transcription start site selection similarly to sua7 (TFIIB) mutations" @default.
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• W4231230519 doi "https://doi.org/10.1128/mcb.14.1.226-237.1994" @default.
• W4231230519 hasPublicationYear "1994" @default.
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