Abstract
Structural genes of phospholipid biosynthesis in the yeastSaccharomyces cerevisiaeare transcriptionally co‐regulated by ICRE (inositol/choline‐responsive element) promoter motifs. Gene activation by an ICRE is mediated by binding of the Ino2/Ino4 transcription factor, whereas repression in the presence of high concentrations of inositol and choline (IC) requires an intact Opi1 repressor. However, the mechanism of specific repression and the functional interplay among these regulators remained unclear from previous work. Usingin vivoas well asin vitrointeraction assays, we show binding of the pleiotropic repressor Sin3 to the pathway‐specific regulator Opi1. The paired amphipathic helix 1 (PAH1) within Sin3 and OSID (Opi1–Sin3 interaction domain) in the N‐terminus of Opi1 were mapped as contact sites. The regulatory significance of the Opi1–Sin3 interaction was shown by the obvious deregulation of an ICRE‐dependent reporter gene in asin3mutant. Opi1 also interacts with a newly identified functional domain of the transcriptional activator Ino2 (RID, repressor interaction domain). These results define the molecular composition of the transcription complex mediating control of ICRE‐dependent genes and allow a hypothesis on the flow of regulatory information in response to phospholipid precursors.
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Dates
Type | When |
---|---|
Created | 22 years, 5 months ago (March 12, 2003, 6:38 a.m.) |
Deposited | 1 year, 7 months ago (Jan. 9, 2024, 3:42 a.m.) |
Indexed | 1 month, 4 weeks ago (July 2, 2025, 3:07 p.m.) |
Issued | 24 years, 2 months ago (July 1, 2001) |
Published | 24 years, 2 months ago (July 1, 2001) |
Published Online | 23 years, 8 months ago (Dec. 21, 2001) |
Published Print | 24 years, 2 months ago (July 1, 2001) |
@article{Wagner_2001, title={The negative regulator Opi1 of phospholipid biosynthesis in yeast contacts the pleiotropic repressor Sin3 and the transcriptional activator Ino2}, volume={41}, ISSN={1365-2958}, url={http://dx.doi.org/10.1046/j.1365-2958.2001.02495.x}, DOI={10.1046/j.1365-2958.2001.02495.x}, number={1}, journal={Molecular Microbiology}, publisher={Wiley}, author={Wagner, Christian and Dietz, Martin and Wittmann, Jürgen and Albrecht, Antje and Schüller, Hans‐Joachim}, year={2001}, month=jul, pages={155–166} }