Regulation of TORC1 by Rag GTPases in nutrient response
| Autor: | Li Li, Pankuri Goraksha-Hicks, Kun-Liang Guan, Thomas P. Neufeld, Eunjung Kim |
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| Rok vydání: | 2008 |
| Předmět: |
GTPase
Biology Article Cell Line 03 medical and health sciences Phosphatidylinositol 3-Kinases 0302 clinical medicine Gene expression Autophagy Animals Drosophila Proteins Humans Amino Acids RNA Small Interfering 030304 developmental biology Cell Proliferation Cell Size Monomeric GTP-Binding Proteins chemistry.chemical_classification 0303 health sciences Schneider 2 cells Cell growth TOR Serine-Threonine Kinases Cell Biology biology.organism_classification Ragulator complex Cell biology Amino acid Drosophila melanogaster Biochemistry chemistry Food 030220 oncology & carcinogenesis Signal transduction Protein Kinases Signal Transduction |
| Zdroj: | Nature cell biology |
| ISSN: | 1476-4679 |
| Popis: | TORC1 (Target of rapamycin complex 1) has a critical role in the regulation of cell growth and cell size. A wide range of signals, including amino acids, is known to activate TORC1. Here, we report the identification of Rag GTPases as novel activators of TORC1 in response to amino acid signals. Knockdown of Rag gene expression suppressed the stimulatory effect of amino acids on TORC1 in Drosophila S2 cells. Expression of constitutively active (GTP-bound) Rag in mammalian cells enhances TORC1 in the absence of amino acids while expression of dominant negative Rag blocks the stimulatory effects of amino acids on TORC1. Drosophila genetic studies also show that the Rag GTPases regulate cell growth, autophagy, and animal viability under starvation. Together, our studies establish a novel function of Rag GTPases in TORC1 activation in response to amino acid signals. |
| Databáze: | OpenAIRE |
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