PXD031469-1

PXD031469 is an original dataset announced via ProteomeXchange.

Title	Selective microautophagy of proteasomes is initiated by ESCRT-0 and is promoted by proteasome ubiquitylation
Description	The proteasome is central to proteolysis by the ubiquitin-proteasome system under normal growth conditions but is itself degraded through macroautophagy under nutrient stress. A recently described AMPactivated protein kinase (AMPK)-regulated endosomal sorting complex required for transport (ESCRT)-dependent microautophagy pathway also regulates proteasome trafficking and degradation in low-glucose conditions in yeast. Aberrant proteasomes are more prone to microautophagy, suggesting the ESCRT system fine-tunes proteasome quality control under low-glucose stress. Here, we uncover additional features of the selective microautophagy of proteasomes in budding yeast. Genetic or pharmacological induction of aberrant proteasomes is associated with increased mono- or oligo-ubiquitylation of proteasome components, which appears to be recognized by ESCRT-0. AMPK controls this pathway in part by regulating the trafficking of ESCRT-0 to the vacuole surface, which also leads to degradation of the Vps27 subunit of ESCRT-0. The Rsp5 ubiquitin ligase contributes to proteasome subunit ubiquitylation, and multiple ubiquitin-binding elements in Vps27 are involved in their recognition.We propose that ESCRT-0 at the vacuole surface recognizes ubiquitylated proteasomes and initiates their microautophagic elimination during glucose depletion.
HostingRepository	iProX
AnnounceDate	2022-02-06
AnnouncementXML	Submission_2022-02-06_00:49:00.752.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Jianhui Li
SpeciesList	scientific name: Saccharomyces cerevisiae; NCBI TaxID: 4932;
ModificationList	No PTMs are included in the dataset
Instrument	Q Exactive Plus

Revision	Datetime	Status	ChangeLog Entry
0	2022-02-06 00:48:28	ID requested
⏵ 1	2022-02-06 00:49:01	announced
2	2023-03-01 23:00:35	announced	2023-03-02: Update publication information.

Dataset with its publication pending

submitter keyword: Proteasome, Protein quality control, Microautophagy, Ubiquitin, ESCRT-0, Rsp5, AMPK

Mark Hochstrasser
contact affiliation	Yale University
contact email	mark.hochstrasser@yale.edu
lab head
Jianhui Li
contact affiliation	Yale University
contact email	jianhui.li@yale.edu
dataset submitter

iProX dataset URI