Reversible 26S proteasome disassembly upon mitochondrial stress.
Identifieur interne : 003544 ( Main/Curation ); précédent : 003543; suivant : 003545Reversible 26S proteasome disassembly upon mitochondrial stress.
Auteurs : Nurit Livnat-Levanon [Israël] ; Éva Kevei [Allemagne] ; Oded Kleifeld [Australie] ; Daria Krutauz [Israël] ; Alexandra Segref [Allemagne] ; Teresa Rinaldi [Italie] ; Zoi Erpapazoglou [France] ; Mickael Cohen [France] ; Noa Reis [Israël] ; Thorsten Hoppe [Allemagne] ; Michael H. Glickman [Israël]Source :
- Cell reports [ 2211-1247 ] ; 2014.
Descripteurs français
- KwdFr :
- Animaux, Antioxydants (pharmacologie), Caenorhabditis elegans (métabolisme), Cricetinae, Cystéine (métabolisme), Espèces réactives de l'oxygène (métabolisme), Lignée cellulaire, Mitochondries (), Mitochondries (métabolisme), Multimérisation de protéines, Proteasome endopeptidase complex (métabolisme), Saccharomyces cerevisiae (métabolisme), Stress oxydatif, Ubiquitine (métabolisme).
- MESH :
English descriptors
- KwdEn :
- Animals, Antioxidants (pharmacology), Caenorhabditis elegans (metabolism), Cell Line, Cricetinae, Cysteine (metabolism), Mitochondria (drug effects), Mitochondria (metabolism), Oxidative Stress, Proteasome Endopeptidase Complex (metabolism), Protein Multimerization, Reactive Oxygen Species (metabolism), Saccharomyces cerevisiae (metabolism), Ubiquitin (metabolism).
- MESH :
- chemical , metabolism : Cysteine, Proteasome Endopeptidase Complex, Reactive Oxygen Species, Ubiquitin.
- chemical , pharmacology : Antioxidants.
- drug effects : Mitochondria.
- metabolism : Caenorhabditis elegans, Mitochondria, Saccharomyces cerevisiae.
- Animals, Cell Line, Cricetinae, Oxidative Stress, Protein Multimerization.
Abstract
In eukaryotic cells, proteasomes exist primarily as 26S holoenzymes, the most efficient configuration for ubiquitinated protein degradation. Here, we show that acute oxidative stress caused by environmental insults or mitochondrial defects results in rapid disassembly of 26S proteasomes into intact 20S core and 19S regulatory particles. Consequently, polyubiquitinated substrates accumulate, mitochondrial networks fragment, and cellular reactive oxygen species (ROS) levels increase. Oxidation of cysteine residues is sufficient to induce proteasome disassembly, and spontaneous reassembly from existing components is observed both in vivo and in vitro upon reduction. Ubiquitin-dependent substrate turnover also resumes after treatment with antioxidants. Reversible attenuation of 26S proteasome activity induced by acute mitochondrial or oxidative stress may be a short-term response distinct from adaptation to long-term ROS exposure or changes during aging.
DOI: 10.1016/j.celrep.2014.04.030
PubMed: 24857655
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pubmed:24857655Le document en format XML
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<term>Mitochondria (drug effects)</term>
<term>Mitochondria (metabolism)</term>
<term>Oxidative Stress</term>
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<term>Espèces réactives de l'oxygène</term>
<term>Mitochondries</term>
<term>Proteasome endopeptidase complex</term>
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<front><div type="abstract" xml:lang="en">In eukaryotic cells, proteasomes exist primarily as 26S holoenzymes, the most efficient configuration for ubiquitinated protein degradation. Here, we show that acute oxidative stress caused by environmental insults or mitochondrial defects results in rapid disassembly of 26S proteasomes into intact 20S core and 19S regulatory particles. Consequently, polyubiquitinated substrates accumulate, mitochondrial networks fragment, and cellular reactive oxygen species (ROS) levels increase. Oxidation of cysteine residues is sufficient to induce proteasome disassembly, and spontaneous reassembly from existing components is observed both in vivo and in vitro upon reduction. Ubiquitin-dependent substrate turnover also resumes after treatment with antioxidants. Reversible attenuation of 26S proteasome activity induced by acute mitochondrial or oxidative stress may be a short-term response distinct from adaptation to long-term ROS exposure or changes during aging.</div>
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