TOR complex 2-Ypk1 signaling maintains sphingolipid homeostasis by sensing and regulating ROS accumulation.
TOR complex 2-Ypk1 signaling maintains sphingolipid homeostasis by sensing and regulating ROS accumulation.
复制标题
TOR复合物2-ippK1信号传导通过传感和调节ROS积累来保持鞘脂稳态。
DOI:
10.1016/j.celrep.2013.12.040
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发表时间:
2014-02-13
期刊:
影响因子:
8.8
通讯作者:
Powers T
中科院分区:
文献类型:
--
作者:
Niles BJ;Joslin AC;Fresques T;Powers T
Reactive oxygen species (ROS) are produced during normal metabolism and can function as signaling molecules. ROS at elevated levels, however, can damage cells. Here we identify the conserved TORC2/Ypk1 signaling module as an important regulator of ROS in the model eukaryotic organism, S. cerevisiae. We show that TORC2/Ypk1 suppresses ROS produced both by mitochondria as well as by non-mitochondrial sources, including changes in acidification of the vacuole. Furthermore, we link vacuole-related ROS to sphingolipids, essential components of cellular membranes, whose synthesis is also controlled by TORC2/Ypk1 signaling. In total, our data reveal that TORC2/Ypk1 act within a homeostatic feedback loop to maintain sphingolipid levels and that ROS are a critical regulatory signal within this system. Thus ROS sensing and signaling by TORC2/Ypk1 play a central physiological role in sphingolipid biosynthesis and in the maintenance of cell growth and viability.
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