Lysosomal cholesterol activates mTORC1 via an SLC38A9-Niemann-Pick C1 signaling complex.

Lysosomal cholesterol activates mTORC1 via an SLC38A9-Niemann-Pick C1 signaling complex.
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DOI:
10.1126/science.aag1417
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发表时间:
2017-03-24
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Zoncu R
Zoncu R
中科院分区:
其他
文献类型:
--
作者:
Castellano BM;Thelen AM;Moldavski O;Feltes M;van der Welle RE;Mydock-McGrane L;Jiang X;van Eijkeren RJ;Davis OB;Louie SM;Perera RM;Covey DF;Nomura DK;Ory DS;Zoncu R

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雷帕霉素复合物1(mTORC 1)蛋白激酶的机制靶标是一种主要的生长调节剂,其在溶酶体处响应于营养提示而被激活。在这里,我们确定胆固醇,细胞生长的基本组成部分,作为一种营养输入,驱动mTORC 1的招聘和激活在溶酶体表面。溶酶体跨膜蛋白SLC 38 A9是胆固醇通过保守的胆固醇反应基序激活mTORC 1所必需的。此外,SLC 38 A9能够独立于其精氨酸传感功能通过胆固醇激活mTORC 1。相反,调节胆固醇从溶酶体输出的尼曼-匹克C1(NPC 1)蛋白与SLC 38 A9结合,并通过其固醇转运功能抑制mTORC 1信号传导。因此,溶酶体胆固醇通过SLC 38 A9-NPC 1复合物驱动mTORC 1活化和生长信号传导。
The mechanistic target of rapamycin complex 1 (mTORC1) protein kinase is a master growth regulator that becomes activated at the lysosome in response to nutrient cues. Here we identify cholesterol, an essential building block for cellular growth, as a nutrient input that drives mTORC1 recruitment and activation at the lysosomal surface. The lysosomal transmembrane protein, SLC38A9, is required for mTORC1 activation by cholesterol through conserved cholesterol-responsive motifs. Moreover, SLC38A9 enables mTORC1 activation by cholesterol independently from its arginine sensing function. Conversely, the Niemann-Pick C1 (NPC1) protein, which regulates cholesterol export from the lysosome, binds to SLC38A9 and inhibits mTORC1 signaling through its sterol transport function. Thus, lysosomal cholesterol drives mTORC1 activation and growth signaling through the SLC38A9-NPC1 complex.
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