Roles of phosphatidylserine and phospholipase C in the activation of TOR complex 2 signaling in <i>Saccharomyces cerevisiae</i>

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  • Wataru Nomura
    Laboratory of Molecular Microbiology 1 , Division of Applied Life Sciences , , Uji, Kyoto 611-0011 , Japan
  • Su-Ping Ng
    Laboratory of Molecular Functions of Food 2 , Division of Food Science and Biotechnology , , Uji, Kyoto 611-0011 , Japan
  • Terunao Takahara
    Graduate School of Bioagricultural Sciences, Nagoya University 3 Department of Applied Biosciences , , Chikusa-ku, Nagoya 464-8601 , Japan
  • Tatsuya Maeda
    Hamamatsu University School of Medicine 4 Department of Biology , , Shizuoka 431-3192 , Japan
  • Teruo Kawada
    Laboratory of Molecular Functions of Food 2 , Division of Food Science and Biotechnology , , Uji, Kyoto 611-0011 , Japan
  • Tsuyoshi Goto
    Laboratory of Molecular Functions of Food 2 , Division of Food Science and Biotechnology , , Uji, Kyoto 611-0011 , Japan
  • Yoshiharu Inoue
    Laboratory of Molecular Microbiology 1 , Division of Applied Life Sciences , , Uji, Kyoto 611-0011 , Japan

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<jats:title>ABSTRACT</jats:title> <jats:p>Target of rapamycin (TOR) forms two distinct complexes, TORC1 and TORC2, to exert its essential functions in cellular growth and homeostasis. TORC1 signaling is regulated in response to nutrients such as amino acids and glucose; however, the mechanisms underlying the activation of TORC2 signaling are still poorly understood compared to those for TORC1 signaling. In the budding yeast Saccharomyces cerevisiae, TORC2 targets the protein kinases Ypk1 and Ypk2 (hereafter Ypk1/2), and Pkc1 for phosphorylation. Plasma membrane stress is known to activate TORC2–Ypk1/2 signaling. We have previously reported that methylglyoxal (MG), a metabolite derived from glycolysis, activates TORC2–Pkc1 signaling. In this study, we found that MG activates the TORC2–Ypk1/2 and TORC2–Pkc1 signaling, and that phosphatidylserine is involved in the activation of both signaling pathways. We also demonstrated that the Rho family GTPase Cdc42 contributes to the plasma membrane stress-induced activation of TORC2–Ypk1/2 signaling. Furthermore, we revealed that phosphatidylinositol-specific phospholipase C, Plc1, contributes to the activation of both TORC2–Ypk1/2 and TORC2–Pkc1 signaling.</jats:p>

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