PXD038157

PXD038157 is an original dataset announced via ProteomeXchange.

Title	Shuffled ATG8 interacting motifs form an ancestral bridge between UFMylation and C53-mediated autophagy
Description	UFMylation mediates the covalent modification of substrate proteins with UFM1 (Ubiquitin- fold modifier 1) and regulates the selective degradation of endoplasmic reticulum (ER) via autophagy (ER-phagy) to maintain ER homeostasis. Specifically, collisions of the ER-bound ribosomes trigger ribosome UFMylation, which in turn activates C53-mediated autophagy that clears the toxic incomplete polypeptides. C53 has evolved non-canonical shuffled ATG8 interacting motifs (sAIMs) that are essential for ATG8 interaction and autophagy initiation. Why these non-canonical motifs were selected during evolution, instead of canonical ATG8 interacting motifs remains unknown. Here, using a phylogenomics approach, we show that UFMylation is conserved across the eukaryotes and secondarily lost in fungi and some other species. Further biochemical assays have confirmed those results and showed that the unicellular algae, Chlamydomonas reinhardtii has a functional UFMylation machinery, overturning the assumption that this process is linked to multicellularity. Our conservation analysis also revealed that UFM1 co-evolves with the sAIMs in C53, reflecting a functional link between UFM1 and the sAIMs. Using biochemical and structural approaches, we confirmed the interaction of UFM1 with the C53 sAIMs and found that UFM1 and ATG8 bound to the sAIMs in a different mode. Conversion of sAIMs into canonical AIMs prevented binding of UFM1 to C53, while strengthening ATG8 interaction. This led to the autoactivation of the C53 pathway and sensitized Arabidopsis thaliana to ER stress. Altogether, our findings reveal an ancestral toggle switch embodied in the sAIMs that regulates C53- mediated autophagy to maintain ER homeostasis.
HostingRepository	PRIDE
AnnounceDate	2023-11-14
AnnouncementXML	Submission_2023-11-14_08:58:35.769.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Richard Imre
SpeciesList	scientific name: Chlamydomonas reinhardtii; NCBI TaxID: NCBITaxon:3055;
ModificationList	phosphorylated residue; monohydroxylated residue; deamidated residue; iodoacetamide derivatized residue
Instrument	Orbitrap Eclipse; Q Exactive

Revision	Datetime	Status	ChangeLog Entry
0	2022-11-15 07:37:59	ID requested
1	2022-11-22 10:37:18	announced
⏵ 2	2023-11-14 08:58:36	announced	2023-11-14: Updated project metadata.

Dataset with its publication pending

submitter keyword: Chlamydomonas reinhardtii, RPL26,ER-Phagy, UFMylation

Yasin Dagdas
contact affiliation	Gregor Mendel Institute of Molecular Plant Biology GmbH Dr. Bohr-Gasse 3, 1030 Vienna, Austria Phone: +43 1 79044 9850 http://www.gmi.oeaw.ac.at
contact email	yasin.dagdas@gmi.oeaw.ac.at
lab head
Richard Imre
contact affiliation	IMBA Vienna
contact email	richard.imre@imba.oeaw.ac.at
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD038157
     1. Label: PRIDE project
     2. Name: Shuffled ATG8 interacting motifs form an ancestral bridge between UFMylation and C53-mediated autophagy