Reference: Oku M, et al. (2013) Hyper-activation of the target of rapamycin (Tor) kinase 1 decreases intracellular glutathione content in Saccharomyces cerevisiae as revealed by LC-MS/MS analysis. Biosci Biotechnol Biochem 77(7):1608-11

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Abstract


The targets of rapamycin (Tor) kinases play central roles in the integrated regulation of cellular activities. Although the molecular mechanisms of Tor-mediated signaling pathways have been studied extensively in yeast, the relationship between kinase activity and the redox maintenance system remains obscure. In this study, we established a quantitative extraction and determination method for glutathione-related compounds in Saccharomyces cerevisiae utilizing liquid chromatography-tandem mass spectrometry (LC-MS/MS). We found decreases in the levels of glutathione and its precursors resulting from the introduction of a Tor1 hyper-active mutation. In line with this finding, the mutant was more sensitive to several heavy metal ions, indicating a physiological defect arising from a failure to regulate the kinase activity.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Oku M, Ichiki Y, Shiraishi A, Takahara T, Maeda T, Sakai Y
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