[No authors listed]
Hsf1 and Msn2/Msn4 transcription factors in Saccharomyces cerevisiae play important roles in cellular homeostasis by activating gene expression in response to multiple stresses including heat shock, oxidative stress and nutrient starvation. Although it has been known that nuclear import of Msn2 is inhibited by phosphorylation, the mechanism for duanyu1529-dependent regulation of Hsf1 is not well understood. Here we demonstrate that Yak1 kinase, which is under the negative control of activates both Hsf1 and Msn2 by phosphorylation when activity is lowered by glucose depletion or by overexpressing Pde2 that hydrolyses cAMP. We show that Yak1 directly phosphorylates Hsf1 in vitro, leading to the increase in DNA binding activity of Hsf1. We also demonstrate that Yak1 phosphorylates Msn2 in vitro, but does not affect DNA binding activity of Msn2 or nuclear localization of Msn2 upon glucose depletion. These results suggest a central role for Yak1 in mediating duanyu1529-dependent inhibition of Hsf1 and Msn2/Msn4.
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