Ufmylation bridges autophagy and ER homeostasis in plants

Baiying Li*, Liwen Jiang*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

1 Citation (Scopus)

Abstract

The autophagic machinery is highly conserved in eukaryotes. Plants, as sessile organisms, are more susceptible to environmental stresses than animals. Autophagy plays a pivotal role in plant stress responses, but the regulation of autophagic flux in plants remains enigmatic with few autophagic receptors identified. We recently characterized an E3 ligase, the ubiquitin-fold modifier 1 (Ufm1) ligase 1 (Ufl1), as well as its small modifier protein Ufm1, as interactors of the core autophagy-related (ATG) proteins. Mutants of these ufmylation system components are hypersensitive to salt stress and trigger the upregulation of endoplasmic reticulum (ER) stress-responsive genes, as well as the accumulation of ER sheets caused by a defect in reticulophagy. Increased expression of Ufl1, Ufm1 and Ufm1-conjugating enzyme 1 (Ufc1) are also triggered by salt stress in plants. This study identified and demonstrated the participation of ufmylation components in maintaining ER homeostasis by regulating reticulophagy under salt stress in plants. Abbreviations: ATG, autophagy-related; ER, endoplasmic reticulum; LIR, LC3-interacting region; ROS, reactive oxygen species; CDK5RAP3/C53, CDK5 regulatory subunit-associated protein 3; Uba5, Ufm1-activating enzyme 5; Ufc1, Ufm1-conjugating enzyme 1; Ufl1, Ufm1 ligase 1; Ufm1, ubiquitin-fold modifier 1; UPR, unfolded protein response.

Original languageEnglish
Pages (from-to)2830-2831
Number of pages2
JournalAutophagy
Volume19
Issue number10
Early online date1 May 2023
DOIs
Publication statusPublished - Oct 2023

Scopus Subject Areas

  • Molecular Biology
  • Cell Biology

User-Defined Keywords

  • Arabidopsis
  • autophagy
  • ER homeostasis
  • ER stress
  • reticulophagy
  • salt stress

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