Lysosomal cholesterol activates mTORC1 via an SLC38A9-Niemann-Pick C1 signaling complex.
Science
; 355(6331): 1306-1311, 2017 03 24.
Article
em En
| MEDLINE
| ID: mdl-28336668
ABSTRACT
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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Base de dados:
MEDLINE
Assunto principal:
Proteínas Nucleares
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Proteínas de Transporte
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Colesterol
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Sistemas de Transporte de Aminoácidos
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Complexos Multiproteicos
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Serina-Treonina Quinases TOR
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Lisossomos
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article