Ragulator-Rag complex targets mTORC1 to the lysosomal surface and is necessary for its activation by amino acids.

Article Details

Citation

Sancak Y, Bar-Peled L, Zoncu R, Markhard AL, Nada S, Sabatini DM

Ragulator-Rag complex targets mTORC1 to the lysosomal surface and is necessary for its activation by amino acids.

Cell. 2010 Apr 16;141(2):290-303. doi: 10.1016/j.cell.2010.02.024. Epub 2010 Apr 8.

PubMed ID
20381137 [ View in PubMed
]
Abstract

The mTORC1 kinase promotes growth in response to growth factors, energy levels, and amino acids, and its activity is often deregulated in disease. The Rag GTPases interact with mTORC1 and are proposed to activate it in response to amino acids by promoting mTORC1 translocation to a membrane-bound compartment that contains the mTORC1 activator, Rheb. We show that amino acids induce the movement of mTORC1 to lysosomal membranes, where the Rag proteins reside. A complex encoded by the MAPKSP1, ROBLD3, and c11orf59 genes, which we term Ragulator, interacts with the Rag GTPases, recruits them to lysosomes, and is essential for mTORC1 activation. Constitutive targeting of mTORC1 to the lysosomal surface is sufficient to render the mTORC1 pathway amino acid insensitive and independent of Rag and Ragulator, but not Rheb, function. Thus, Rag-Ragulator-mediated translocation of mTORC1 to lysosomal membranes is the key event in amino acid signaling to mTORC1.

DrugBank Data that Cites this Article

Polypeptides
NameUniProt ID
Serine/threonine-protein kinase mTORP42345Details
GTP-binding protein RhebQ15382Details