Autophagic Degradation of the 26S Proteasome Is Mediated by the Dual ATG8/Ubiquitin Receptor RPN10 in Arabidopsis
Abstract
Autophagic turnover of intracellular constituents is critical for cellular housekeeping, nutrient recycling, and various aspects of growth and development in eukaryotes. In this paper, we show that autophagy impacts the other major degradative route involving the ubiquitin-proteasome system by eliminating 26S proteasomes, a process we termed proteaphagy. Using Arabidopsis proteasomes tagged with GFP, we observed their deposition into vacuoles via a route requiring components of the autophagy machinery. This transport can be initiated separately by nitrogen starvation and chemical or genetic inhibition of the proteasome, implying distinct induction mechanisms. Proteasome inhibition stimulates comprehensive ubiquitylation of the complex, with the ensuing proteaphagy requiring the proteasome subunit RPN10, which can simultaneously bind both ATG8 and ubiquitin. Finally and collectively, we propose that Arabidopsis RPN10 acts as a selective autophagy receptor that targets inactive 26S proteasomes by concurrent interactions with ubiquitylated proteasome subunits/targets and lipidated ATG8 lining the enveloping autophagic membranes.
- Authors:
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1259320
- Alternate Identifier(s):
- OSTI ID: 1250268; OSTI ID: 1344491
- Grant/Contract Number:
- FG02-88ER13968
- Resource Type:
- Published Article
- Journal Name:
- Molecular Cell
- Additional Journal Information:
- Journal Name: Molecular Cell Journal Volume: 58 Journal Issue: 6; Journal ID: ISSN 1097-2765
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Marshall, Richard S., Li, Faqiang, Gemperline, David C., Book, Adam J., and Vierstra, Richard D. Autophagic Degradation of the 26S Proteasome Is Mediated by the Dual ATG8/Ubiquitin Receptor RPN10 in Arabidopsis. United States: N. p., 2015.
Web. doi:10.1016/j.molcel.2015.04.023.
Marshall, Richard S., Li, Faqiang, Gemperline, David C., Book, Adam J., & Vierstra, Richard D. Autophagic Degradation of the 26S Proteasome Is Mediated by the Dual ATG8/Ubiquitin Receptor RPN10 in Arabidopsis. United States. https://doi.org/10.1016/j.molcel.2015.04.023
Marshall, Richard S., Li, Faqiang, Gemperline, David C., Book, Adam J., and Vierstra, Richard D. Mon .
"Autophagic Degradation of the 26S Proteasome Is Mediated by the Dual ATG8/Ubiquitin Receptor RPN10 in Arabidopsis". United States. https://doi.org/10.1016/j.molcel.2015.04.023.
@article{osti_1259320,
title = {Autophagic Degradation of the 26S Proteasome Is Mediated by the Dual ATG8/Ubiquitin Receptor RPN10 in Arabidopsis},
author = {Marshall, Richard S. and Li, Faqiang and Gemperline, David C. and Book, Adam J. and Vierstra, Richard D.},
abstractNote = {Autophagic turnover of intracellular constituents is critical for cellular housekeeping, nutrient recycling, and various aspects of growth and development in eukaryotes. In this paper, we show that autophagy impacts the other major degradative route involving the ubiquitin-proteasome system by eliminating 26S proteasomes, a process we termed proteaphagy. Using Arabidopsis proteasomes tagged with GFP, we observed their deposition into vacuoles via a route requiring components of the autophagy machinery. This transport can be initiated separately by nitrogen starvation and chemical or genetic inhibition of the proteasome, implying distinct induction mechanisms. Proteasome inhibition stimulates comprehensive ubiquitylation of the complex, with the ensuing proteaphagy requiring the proteasome subunit RPN10, which can simultaneously bind both ATG8 and ubiquitin. Finally and collectively, we propose that Arabidopsis RPN10 acts as a selective autophagy receptor that targets inactive 26S proteasomes by concurrent interactions with ubiquitylated proteasome subunits/targets and lipidated ATG8 lining the enveloping autophagic membranes.},
doi = {10.1016/j.molcel.2015.04.023},
journal = {Molecular Cell},
number = 6,
volume = 58,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 2015},
month = {Mon Jun 01 00:00:00 EDT 2015}
}
https://doi.org/10.1016/j.molcel.2015.04.023
Web of Science
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