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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Oshiro, Noriko Avruch, Joseph Rapley, Joseph |
| Description | Author Affiliation: Oshiro N ( From the Department of Molecular Biology and Diabetes Unit, Medical Services, Massachusetts General Hospital, Boston, Massachusetts 02114 and the Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115.) |
| Abstract | Activation of mammalian target of rapamycin complex 1 (mTORC1) by amino acids is mediated in part by the Rag GTPases, which bind the raptor subunit of mTORC1 in an amino acid-stimulated manner and promote mTORC1 interaction with Rheb-GTP, the immediate activator. Here we examine whether the ability of amino acids to regulate mTORC1 binding to Rag and mTORC1 activation is due to the regulation of Rag guanyl nucleotide charging. Rag heterodimers in vitro exhibit a very rapid, spontaneous exchange of guanyl nucleotides and an inability to hydrolyze GTP. Mutation of the Rag P-loop corresponding to $Ras^{Ser-17}$ abolishes guanyl nucleotide binding. Such a mutation in RagA or RagB inhibits, whereas in RagC or RagD it enhances, Rag heterodimer binding to mTORC1. The binding of wild-type and mutant Rag heterodimers to mTORC1 in vitro parallels that seen with transient expression, but binding to mTORC1 in vitro is entirely independent of Rag guanyl nucleotide charging. HeLa cells stably overexpressing wild-type or P-loop mutant RagC exhibit unaltered amino acid regulation of mTORC1. Despite amino acid-independent raptor binding to Rag, mTORC1 is inhibited by amino acid withdrawal as in parental cells. Rag heterodimers extracted from $^{32}P-labeled$ whole cells, or just from the pool associated with the lysosomal membrane, exhibit constitutive $[^{32}P]GTP$ charging that is unaltered by amino acid withdrawal. Thus, amino acids promote mTORC1 activation without altering Rag GTP charging. Raptor binding to Rag, although necessary, is not sufficient for mTORC1 activation. Additional amino acid-dependent steps couple Rag-mTORC1 to Rheb-GTP. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 5 |
| Volume Number | 289 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2014-01-31 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amino Acids Metabolism GTP Phosphohydrolases Monomeric GTP-Binding Proteins Multiprotein Complexes TOR Serine-Threonine Kinases Adaptor Proteins, Signal Transducing Dimerization Enzyme Activation Physiology Chemistry Genetics HEK293 Cells HeLa Cells Protein Binding Signal Transduction Tritium Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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