PXD040435

PXD040435 is an original dataset announced via ProteomeXchange.

Title	The Plant Unique ESCRT Component FREE1 Regulates Autophagosome Closure
Description	The energy sensor AMP-activated protein kinase (AMPK) can activate autophagy when cellular energy production becomes compromised. However, the degree to which nutrient sensing impinges on the autophagosome closure remains unknown. Here, we provide the mechanism underlying a plant unique protein FREE1, upon autophagy-induced SnRK1α1-mediated phosphorylation, functions as a linkage between ATG conjugation system and ESCRT machinery to regulate the autophagosome closure upon nutrient deprivation. Using high-resolution microscopy, 3D-electron tomography, and protease protection assay, we showed that unclosed autophagosomes accumulated in free1 mutants. Proteomic, cellular and biochemical analysis revealed the mechanistic connection between FREE1 and the ATG conjugation system/ESCRT-III complex in regulating autophagosome closure. Mass spectrometry analysis showed that the evolutionary conserved plant energy sensor SnRK1α1 phosphorylates FREE1 and recruits it to the autophagosomes to promote closure. Mutagenesis of the phosphorylation site on FREE1 caused the autophagosome closure failure. Our findings unveil how cellular energy sensing pathways regulate autophagosome closure to maintain cellular homeostasis.
HostingRepository	PRIDE
AnnounceDate	2023-11-14
AnnouncementXML	Submission_2023-11-14_09:00:22.421.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Lei Feng
SpeciesList	scientific name: Arabidopsis thaliana (Mouse-ear cress); NCBI TaxID: 3702;
ModificationList	No PTMs are included in the dataset
Instrument	Orbitrap Fusion Lumos

Revision	Datetime	Status	ChangeLog Entry
0	2023-02-27 06:00:39	ID requested
⏵ 1	2023-11-14 09:00:22	announced

Dataset with its publication pending

submitter keyword: AP-MS, Autophagosome, Arabidopsis thaliana,ESCRT, FREE1

Lei Feng
contact affiliation	The Chinese University of Hong Kong
contact email	lfeng@link.cuhk.edu.hk
lab head
Lei Feng
contact affiliation	The Chinese University of Hong Kong
contact email	lfeng@link.cuhk.edu.hk
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD040435
     1. Label: PRIDE project
     2. Name: The Plant Unique ESCRT Component FREE1 Regulates Autophagosome Closure