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Leucine Signals to mTORC1 via Its Metabolite Acetyl-Coenzyme A

机译:通过其代谢物乙酰辅酶A亮氨酸向MTORC1发出信号

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The mechanistic target of rapamycin (mTOR) complex 1 (mTORC1) is a master regulator of cell growth and metabolism. Leucine (Leu) activates mTORC1 and many have tried to identify the mechanisms whereby cells sense Leu in this context. Here we describe that the Leu metabolite acetyl-coenzyme A (AcCoA) positively regulates mTORC1 activity by EP300-mediated acetylation of the mTORC1 regulator, Raptor, at K1097. Leu metabolism and consequent mTORC1 activity are regulated by intermediary enzymes. As AcCoA is a Leu metabolite, this process directly correlates with Leu abundance, and does not require Leu sensing via intermediary proteins, as has been described previously. Importantly, we describe that this pathway regulates mTORC1 in a cell-type-specific manner. Finally, we observed decreased acetylated Raptor, and inhibited mTORC1 and EP300 activity in fasted mice tissues. These results provide a direct mechanism for mTORC1 regulation by Leu metabolism.
机译:雷帕霉素(MTOR)复合物1(MTORC1)的机械靶标是细胞生长和代谢的主调节因子。 亮氨酸(leu)激活MTORC1,许多人试图识别在这种情况下细胞感测Leu的机制。 在这里,我们描述了Leu代谢物乙酰辅酶A(AccoA)通过EP300介导的MTORC1调节剂,Raptor,在K1097的乙酰乙酰乙酰乙酰乙酰基乙酰乙酰末端来呈正调节MTORC1活性。 Leu新陈代谢和随后的MTORC1活性由中间酶进行调节。 由于AccoA是Leu代谢物,该过程与Leu丰度直接相关,并且不需要通过中间蛋白质感测,如前所述。 重要的是,我们描述了该途径以细胞类型特异性方式调节MTORC1。 最后,我们观察到降低乙酰化猛龙龙,并在禁区组织中抑制MTORC1和EP300活性。 这些结果提供了Leu新陈代谢的MTORC1调节的直接机制。

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