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Mitochondrial regulation of the 26S proteasome.

Cell Rep. 32:108059 (2020)
Verlagsversion Forschungsdaten DOI
Open Access Gold
Creative Commons Lizenzvertrag
The proteasome is the main proteolytic system for targeted protein degradation in the cell and is fine-tuned according to cellular needs. Here, we demonstrate that mitochondrial dysfunction and concomitant metabolic reprogramming of the tricarboxylic acid (TCA) cycle reduce the assembly and activity of the 26S proteasome. Both mitochondrial mutations in respiratory complex I and treatment with the anti-diabetic drug metformin impair 26S proteasome activity. Defective 26S assembly is reversible and can be overcome by supplementation of aspartate or pyruvate. This metabolic regulation of 26S activity involves specific regulation of proteasome assembly factors via the mTORC1 pathway. Of note, reducing 26S activity by metformin confers increased resistance toward the proteasome inhibitor bortezomib, which is reversible upon pyruvate supplementation. Our study uncovers unexpected consequences of defective mitochondrial metabolism for proteasomal protein degradation in the cell, which has important pathophysiological and therapeutic implications.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter 26s Proteasome ; Aspartate ; Metabolic Reprogramming ; Metformin ; Mitochondria ; Proteasome Assembly Factors ; Proteasome Inhibitor Resistance ; Pyruvate ; Respiratory Complex I ; Rpn6 ; Tca; Complex I Deficiency; Protein-synthesis; Mutations Cause; Cultured-cells; Degradation; Phosphorylation; Diseases; Subunits; Pathway; System
ISSN (print) / ISBN 2211-1247
e-ISSN 2211-1247
Zeitschrift Cell Reports
Quellenangaben Band: 32, Heft: 8, Seiten: , Artikelnummer: 108059 Supplement: ,
Verlag Cell Press
Verlagsort 50 Hampshire St, Floor 5, Cambridge, Ma 02139 Usa
Begutachtungsstatus Peer reviewed