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mTOR-dependent phosphorylation controls TFEB nuclear export
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Journal Article
mTOR-dependent phosphorylation controls TFEB nuclear export
2018
Overview
During starvation the transcriptional activation of catabolic processes is induced by the nuclear translocation and consequent activation of transcription factor EB (TFEB), a master modulator of autophagy and lysosomal biogenesis. However, how TFEB is inactivated upon nutrient refeeding is currently unknown. Here we show that TFEB subcellular localization is dynamically controlled by its continuous shuttling between the cytosol and the nucleus, with the nuclear export representing a limiting step. TFEB nuclear export is mediated by CRM1 and is modulated by nutrient availability via mTOR-dependent hierarchical multisite phosphorylation of serines S142 and S138, which are localized in proximity of a nuclear export signal (NES). Our data on TFEB nucleo-cytoplasmic shuttling suggest an unpredicted role of mTOR in nuclear export.
On amino acid deprivation TFEB translocates from the cytoplasm to the nucleus. Here the authors identify a nuclear export signal in TFEB that is recognized by the exportin CRM1, and show that dual phosphorylation at S142 and S138 by mTOR accelerates export of TFEB.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 13/89
/ 13/95
/ 14
/ 14/19
/ 96/35
/ Basic Helix-Loop-Helix Leucine Zipper Transcription Factors - chemistry
/ Basic Helix-Loop-Helix Leucine Zipper Transcription Factors - metabolism
/ Cytosol
/ Exports
/ Humanities and Social Sciences
/ Humans
/ Kinases
/ Kinetics
/ Receptors, Cytoplasmic and Nuclear
/ Science
/ TOR Serine-Threonine Kinases - metabolism
/ Yeast
