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Pubmed ID :28270554
Publication Date : //

Identifying protein kinase-specific effectors of the osmostress response in yeast.


The budding yeast reacts to increased external osmolarity by modifying many cellular processes. Adaptive signaling relies primarily on the high-osmolarity glycerol (HOG) pathway, which is closely related to the mammalian p38 mitogen-activated protein kinase (MAPK) pathway in core architecture. To identify target proteins of the MAPK Hog1, we designed a mass spectrometry-based high-throughput experiment to measure the impact of Hog1 activation or inhibition on the phosphoproteome. In addition, we analyzed how deletion of , which encodes a known effector protein kinase target of Hog1, modulated osmotic stress-induced phosphorylation. Our results not only provide an overview of the diversity of cellular functions that are directly and indirectly affected by the activity of the HOG pathway but also enabled an assessment of the Hog1-independent events that occur under osmotic stress conditions. We extended the number of putative Hog1 direct targets by analyzing the modulation of motifs consisting of serine or threonine followed by a proline (S/T-P motif) and subsequently validated these with an in vivo interaction assay. Rck2 appears to act as a central hub for many Hog1-mediated secondary phosphorylation events. This study clarifies many of the direct and indirect effects of HOG signaling and its stress-adaptive functions.

Authors : Romanov Natalie , Hollenstein David Maria , Janschitz Marion , Ammerer Gustav , Anrather Dorothea , Reiter Wolfgang ,

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