Multilayered regulation of TORC1-body formation in budding yeast.

Abstract:

:The target of rapamycin kinase complex 1 (TORC1) regulates cell growth and metabolism in eukaryotes. In Saccharomyces cerevisiae, TORC1 activity is known to be controlled by the conserved GTPases, Gtr1/2, and movement into and out of an inactive agglomerate/body. However, it is unclear whether/how these regulatory steps are coupled. Here we show that active Gtr1/2 is a potent inhibitor of TORC1-body formation, but cells missing Gtr1/2 still form TORC1-bodies in a glucose/nitrogen starvation-dependent manner. We also identify 13 new activators of TORC1-body formation and show that seven of these proteins regulate the Gtr1/2-dependent repression of TORC1-body formation, while the remaining proteins drive the subsequent steps in TORC1 agglomeration. Finally, we show that the conserved phosphatidylinositol-3-phosphate (PI(3)P) binding protein, Pib2, forms a complex with TORC1 and overrides the Gtr1/2-dependent repression of TORC1-body formation during starvation. These data provide a unified, systems-level model of TORC1 regulation in yeast.

journal_name

Mol Biol Cell

authors

Sullivan A,Wallace RL,Wellington R,Luo X,Capaldi AP

doi

10.1091/mbc.E18-05-0297

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

400-410

issue

3

eissn

1059-1524

issn

1939-4586

journal_volume

30

pub_type

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