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S. pombe TORC1 activates the ubiquitin-proteasomal degradation of the meiotic regulator Mei2 in cooperation with Pat1 kinase.

J. Cell. Sci.2014 Jun 15;127(Pt 12):2639-46. Epub 2014 Apr 16
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摘要


Target of rapamycin (TOR) kinase regulates cell metabolism and growth, acting as a subunit of two multi-protein complexes, TORC1 and TORC2. Known TORC substrates are either kinases or general factors involved in growth control. Here, we show that fission yeast TORC1, which promotes vegetative growth and suppresses sexual development, can phosphorylate Mei2 (a specific factor involved in switching the cell fate) in vitro. Alanine substitutions at the nine Mei2 phosphorylation sites stabilize the protein and promote mating and meiosis in vivo. We found that Mei2 is polyubiquitylated in vivo in a TORC1-dependent manner. Based on these data, we propose that TORC1 contributes to the suppression of sexual development by phosphorylating Mei2, in addition to controlling the cellular metabolic status.

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