Reference: Sulahian R, et al. (2006) The proteasomal ATPase complex is required for stress-induced transcription in yeast. Nucleic Acids Res 34(5):1351-7

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Abstract


Sug1 and Sug2 are two of six ATPases in the 19S regulatory particle of the 26S proteasome. We have shown previously that these proteins play a non-proteolytic role in the transcription of the GAL genes in yeast. In this study, we probe the requirement for these factors in stress-induced transcription in yeast. It is known that proteasomal proteolysis is not required for these events. Indeed, proteasome inhibitors strongly stimulate expression of these stress response genes. However, shifting strains carrying temperature-sensitive alleles of SUG1 and SUG2 to the restrictive temperature strongly inhibited the expression of HSP26, HSP104 and GAD1 in response to heat shock or treatment with menadione bisulfate. Furthermore, chromatin immunoprecipitation analysis revealed the recruitment of Sug1, Sug2 and Cim5 (another of the ATPases), but not 20S proteasome core proteins, to the promoters of these genes. These data show that the non-proteolytic requirement for the proteasomal ATPases extends beyond the GAL genes in yeast and includes at least the heat and oxidative stress-responsive genes.

Reference Type
Journal Article | Research Support, N.I.H., Extramural
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Sulahian R, Sikder D, Johnston SA, Kodadek T
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