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Brain-enriched RagB isoforms regulate the dynamics of mTORC1 activity through GATOR1 inhibition

Mechanistic target of rapamycin complex 1 (mTORC1) senses nutrient availability to appropriately regulate cellular anabolism and catabolism. During nutrient restriction, different organs in an animal do not respond equally, with vital organs being relatively spared. This raises the possibility that...

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Main Authors: Figlia, Gianluca (Author) , Müller, Sandra (Author) , Hertle, Anna M. (Author) , Kleber, Susanne (Author) , Roiuk, Mykola (Author) , Quast, Jan-Philipp (Author) , ten Bosch, Nora (Author) , Carvajal Ibáñez, Damián (Author) , Mauceri, Daniela (Author) , Martín-Villalba, Ana (Author) , Teleman, Aurelio A. (Author)
Format: Article (Journal)
Language:English
Published: 12 September 2022
In: Nature cell biology
Year: 2022, Volume: 24, Issue: 9, Pages: 1407-1421
ISSN:1476-4679
DOI:10.1038/s41556-022-00977-x
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1038/s41556-022-00977-x
Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/s41556-022-00977-x
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Author Notes:Gianluca Figlia, Sandra Müller, Anna M. Hagenston, Susanne Kleber, Mykola Roiuk, Jan-Philipp Quast, Nora ten Bosch, Damian Carvajal Ibañez, Daniela Mauceri, Ana Martin-Villalba and Aurelio A. Teleman
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Summary:Mechanistic target of rapamycin complex 1 (mTORC1) senses nutrient availability to appropriately regulate cellular anabolism and catabolism. During nutrient restriction, different organs in an animal do not respond equally, with vital organs being relatively spared. This raises the possibility that mTORC1 is differentially regulated in different cell types, yet little is known about this mechanistically. The Rag GTPases, RagA or RagB bound to RagC or RagD, tether mTORC1 in a nutrient-dependent manner to lysosomes where mTORC1 becomes activated. Although the RagA and B paralogues were assumed to be functionally equivalent, we find here that the RagB isoforms, which are highly expressed in neurons, impart mTORC1 with resistance to nutrient starvation by inhibiting the RagA/B GTPase-activating protein GATOR1. We further show that high expression of RagB isoforms is observed in some tumours, revealing an alternative strategy by which cancer cells can retain elevated mTORC1 upon low nutrient availability.
Item Description:PDF Datei enthält noch zusätzlich 23 ungezählte Seiten
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Physical Description:Online Resource
ISSN:1476-4679
DOI:10.1038/s41556-022-00977-x

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