Hyperosmotic stress response involves the adaptative mechanisms needed for cell survival. Under these conditions many stress response genes are activated by several unrelated transcription factors that are controlled by the Hog1 kinase. Osmostress transcription factor Hot1 regulates the expression of several genes involved in glycerol biosinthesis, and the presence of this transcription factor at their promoters is essential for RNApol II recruitment. The physical association between Hog1 and Hot1 activates this transcription factor and directs the RNA polymerase II localization at these promoters. We herein demonstrate that physical and genetical interactions exist between Hot1 and several proteins involved in transcriptional and posttranscriptional processes: e.g. transcription co-activator Sub1 and elongation complex Spt4/5. The results presented in this work demonstrate that Hot1 enrichment is not detected through the coding regions of its target genes, and rule out a direct role in transcription elongation. Instead, other data presented herein indicate a key function of the Hot1 transcription factor in the recruitment of these proteins to the promoter or the 5'-coding region of the genes under its control.
- Tandem Affinity Purification
- Saccharomyces cerevisiae
- ©2016 The Author(s)
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