Metabolism. Differential regulation of mTORC1 by leucine and glutamine.

Metabolism. Differential regulation of mTORC1 by leucine and glutamine.
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DOI:
10.1126/science.1259472
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发表时间:
2015-01-09
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Guan KL
Guan KL
中科院分区:
其他
文献类型:
--
作者:
Jewell JL;Kim YC;Russell RC;Yu FX;Park HW;Plouffe SW;Tagliabracci VS;Guan KL

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雷帕霉素(mTOR)复合物1 (mTORC1)的机制靶点整合环境和细胞内信号来调节细胞生长。氨基酸刺激溶酶体的mTORC1活化的方式被认为依赖于Rag小鸟苷三磷酸酶(GTPases)、调节复合物和液泡H+-腺苷三磷酸酶(v-ATPase)。我们报道了亮氨酸和谷氨酰胺分别通过Rag gtpase依赖性和非依赖性机制刺激mTORC1。在RagA和RagB敲除细胞中,谷氨酰胺促进mTORC1转运到溶酶体,并且需要v-ATPase而不需要调节因子。此外,我们发现腺苷二磷酸核糖基化因子-1 GTPase是谷氨酰胺激活mTORC1和溶酶体定位所必需的。我们的研究结果揭示了独立于Rag GTPases的mTORC1激活的信号级联,并表明mTORC1受特定氨基酸的差异调节。
The mechanistic target of rapamycin (mTOR) complex 1 (mTORC1) integrates environmental and intracellular signals to regulate cell growth. Amino acids stimulate mTORC1 activation at the lysosome in a manner thought to be dependent on the Rag small guanosine triphosphatases (GTPases), the Ragulator complex, and the vacuolar H+-adenosine triphosphatase (v-ATPase). We report that leucine and glutamine stimulate mTORC1 by Rag GTPase-dependent and -independent mechanisms, respectively. Glutamine promoted mTORC1 translocation to the lysosome in RagA and RagB knockout cells and required the v-ATPase but not the Ragulator. Furthermore, we identified the adenosine diphosphate ribosylation factor-1 GTPase to be required for mTORC1 activation and lysosomal localization by glutamine. Our results uncover a signaling cascade to mTORC1 activation independent of the Rag GTPases and suggest that mTORC1 is differentially regulated by specific amino acids.
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