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Phosphorylation of Hsl1 by Hog1 leads to a G2 arrest essential for cell survival at high osmolarity

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Issue date
2006
Author
Clotet Bellmunt, Josep
Escoté, Xavier
Àngel Adrover, Miquel
Yaakov, Gilad
Garí Marsol, Eloi
Aldea, Martí
de Nadal, Eulàlia
Posas, Francesc
Suggested citation
Clotet Bellmunt, Josep; Escoté, Xavier; Àngel Adrover, Miquel; Yaakov, Gilad; Garí Marsol, Eloi; Aldea, Martí; ... Posas, Francesc. (2006) . Phosphorylation of Hsl1 by Hog1 leads to a G2 arrest essential for cell survival at high osmolarity. The EMBO Journal, 2006, vol. 25, p. 2338–2346. https://doi.org/10.1038/sj.emboj.7601095.
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Abstract
Control of cell cycle progression by stress-activated protein kinases (SAPKs) is essential for cell adaptation to extracellular stimuli. Exposure of yeast to osmostress leads to activation of the Hog1 SAPK, which controls cell cycle at G1 by the targeting of Sic1. Here, we show that survival to osmostress also requires regulation of G2 progression. Activated Hog1 interacts and directly phosphorylates a residue within the Hsl7-docking site of the Hsl1 checkpoint kinase, which results in delocalization of Hsl7 from the septin ring and leads to Swe1 accumulation. Upon Hog1 activation, cells containing a nonphosphorylatable Hsl1 by Hog1 are unable to promote Hsl7 delocalization, fail to arrest at G2 and become sensitive to osmostress. Together, we present a novel mechanism that regulates the Hsl1–Hsl7 complex to integrate stress signals to mediate cell cycle arrest and, demonstrate that a single MAPK coordinately modulates different cell cycle checkpoints to improve cell survival upon stress.
URI
http://hdl.handle.net/10459.1/59047
DOI
https://doi.org/10.1038/sj.emboj.7601095
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The EMBO Journal, 2006, vol. 25, p. 2338–2346
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  • Articles publicats (Ciències Mèdiques Bàsiques) [548]
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