The Rag GTPase-Ragulator complex attenuates TOR complex 1 signaling in fission yeast.

Abstract:

:Target of rapamycin complex 1 (TORC1) is an evolutionarily conserved protein kinase complex, whose activation in response to nutrients suppresses autophagy. In mammalian cells, amino-acid stimuli induce lysosomal translocation and activation of MTORC1 through the RRAG GTPase heterodimer, which is tethered to the surface of lysosomes by the Ragulator complex. Our recent study demonstrated that the fission yeast Schizosaccharomyces pombe also has a Ragulator complex that anchors the Gtr1-Gtr2 Rag GTPase heterodimer to the vacuole, a lysosome-like organelle. Unexpectedly, however, neither vacuolar localization nor activation of TORC1 is dependent on the Rag-Ragulator complex, which instead plays a critical role in attenuating TORC1 signaling. Our findings suggest dual functionality of the Rag GTPase in both activation and inactivation of TORC1.

journal_name

Autophagy

journal_title

Autophagy

authors

Fukuda T,Shiozaki K

doi

10.1080/15548627.2018.1444313

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

1105-1106

issue

6

eissn

1554-8627

issn

1554-8635

journal_volume

14

pub_type

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