An integrative model of ion regulation in yeast

PLoS Computational Biology
Ruian KeKen Haynes

Abstract

Yeast cells are able to tolerate and adapt to a variety of environmental stresses. An essential aspect of stress adaptation is the regulation of monovalent ion concentrations. Ion regulation determines many fundamental physiological parameters, such as cell volume, membrane potential, and intracellular pH. It is achieved through the concerted activities of multiple cellular components, including ion transporters and signaling molecules, on both short and long time scales. Although each component has been studied in detail previously, it remains unclear how the physiological parameters are maintained and regulated by the concerted action of all components under a diverse range of stress conditions. In this study, we have constructed an integrated mathematical model of ion regulation in Saccharomyces cerevisiae to understand this coordinated adaptation process. Using this model, we first predict that the interaction between phosphorylated Hog1p and Tok1p at the plasma membrane inhibits Tok1p activity and consequently reduces Na(+) influx under NaCl stress. We further characterize the impacts of NaCl, sorbitol, KCl and alkaline pH stresses on the cellular physiology and the differences between the cellular responses to these stres...Continue Reading

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Related Concepts

Saccharomyces cerevisiae Proteins
Cell Cycle Progression
Metabolic Process, Cellular
Biochemical Pathway
Transcriptional Regulation
Glycerin
Osmoregulation
Phosphoric Monoester Hydrolases
SLC9A1 gene
Extracellular

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