Regulated Proteolysis Induces Aberrant Phase Transition of Biomolecular Condensates into Aggregates: A Protective Role for the Chaperone Clusterin.

Autor: Kamps J; Department Biochemistry of Neurodegenerative Diseases, Institute of Biochemistry and Pathobiochemistry, Ruhr University, Bochum, Germany., Yuste-Checa P; Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, Martinsried, Germany., Mamashli F; Department Biochemistry of Neurodegenerative Diseases, Institute of Biochemistry and Pathobiochemistry, Ruhr University, Bochum, Germany., Schmitz M; Department of Neurology, University Medical Center, Göttingen, Germany., Herrera MG; Department Molecular Cell Biology, Institute of Biochemistry and Pathobiochemistry, Ruhr University, Bochum, Germany., da Silva Correia SM; Department of Neurology, University Medical Center, Göttingen, Germany., Gogte K; Department Biochemistry of Neurodegenerative Diseases, Institute of Biochemistry and Pathobiochemistry, Ruhr University, Bochum, Germany., Bader V; Department Molecular Cell Biology, Institute of Biochemistry and Pathobiochemistry, Ruhr University, Bochum, Germany., Zerr I; Department of Neurology, University Medical Center, Göttingen, Germany., Hartl FU; Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, Martinsried, Germany; Munich Cluster for Systems Neurology (SyNergy), Munich, Germany., Bracher A; Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, Martinsried, Germany., Winklhofer KF; Department Molecular Cell Biology, Institute of Biochemistry and Pathobiochemistry, Ruhr University, Bochum, Germany; Cluster of Excellence RESOLV, Bochum, Germany., Tatzelt J; Department Biochemistry of Neurodegenerative Diseases, Institute of Biochemistry and Pathobiochemistry, Ruhr University, Bochum, Germany; Cluster of Excellence RESOLV, Bochum, Germany. Electronic address: Joerg.Tatzelt@rub.de.
Jazyk: angličtina
Zdroj: Journal of molecular biology [J Mol Biol] 2024 Dec 01; Vol. 436 (23), pp. 168839. Date of Electronic Publication: 2024 Oct 28.
DOI: 10.1016/j.jmb.2024.168839
Abstrakt: Several proteins associated with neurodegenerative diseases, such as the mammalian prion protein (PrP), undergo liquid-liquid phase separation (LLPS), which led to the hypothesis that condensates represent precursors in the formation of neurotoxic protein aggregates. However, the mechanisms that trigger aberrant phase separation are incompletely understood. In prion diseases, protease-resistant and infectious amyloid fibrils are composed of N-terminally truncated PrP, termed C2-PrP. C2-PrP is generated by regulated proteolysis (β-cleavage) of the cellular prion protein (PrP C ) specifically upon prion infection, suggesting that C2-PrP is a misfolding-prone substrate for the propagation of prions. Here we developed a novel assay to investigate the role of both LLPS and β-cleavage in the formation of C2-PrP aggregates. We show that β-cleavage induces the formation of C2-PrP aggregates, but only when full-length PrP had formed biomolecular condensates via LLPS before proteolysis. In contrast, C2-PrP remains soluble after β-cleavage of non-phase-separated PrP. To investigate whether extracellular molecular chaperones modulate LLPS of PrP and/or misfolding of C2-PrP, we focused on Clusterin. Clusterin does not inhibit LLPS of full-length PrP, however, it prevents aggregation of C2-PrP after β-cleavage of phase-separated PrP. Furthermore, Clusterin interferes with the in vitro amplification of infectious human prions isolated from Creutzfeldt-Jakob disease patients. Our study revealed that regulated proteolysis triggers aberrant phase transition of biomolecular condensates into aggregates and identified Clusterin as a component of the extracellular quality control pathway to prevent the formation and propagation of pathogenic PrP conformers.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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