PreprintCited by 3Genetic Neurodegenerative DiseasesAutophagy in Disease and TherapyLysosomal Storage Disorders Research

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Autophagy preferentially degrades non-fibrillar polyQ aggregates

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Preprint — published as 10.1016/j.molcel.2024.04.018

Abstract

Summary: Aggregation of proteins containing expanded polyglutamine (polyQ) repeats is the cytopathologic hallmark of a group of dominantly inherited neurodegenerative diseases, including Huntington’s disease (HD). Huntingtin (Htt), the disease protein of HD, forms amyloid-like fibrils by liquid-to-solid phase transition. Macroautophagy has been proposed to clear polyQ aggregates, but the efficiency of aggrephagy is limited. Here, we used cryo-electron tomography to visualize the interactions of autophagosomes with polyQ aggregates in cultured cells in situ . We found that an amorphous aggregate phase exists next to the radially organized polyQ fibrils. Autophagosomes preferentially engulfed this amorphous material, mediated by interactions between the autophagy receptor p62/SQSTM1 and the non-fibrillar aggregate surface. In contrast, amyloid fibrils excluded p62 and evaded clearance, resulting in trapping of autophagic structures. These results suggest that the limited efficiency of autophagy in clearing polyQ aggregates is due to the inability of autophagosomes to interact productively with the non-deformable, fibrillar disease aggregates.

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Metadata

Authors
Zhao, D. Y., Bäuerlein, F. J. B., Saha, I., Hartl, F. U., Baumeister, W., & Wilfling, F.
Affiliations
  • Max Planck Institute of Biochemistry (DE)
  • Universitätsmedizin Göttingen (DE)
  • Max Planck Institute of Biophysics (DE)
Corresponding author
  • Zhao, Dorothy Y.
  • Hartl, F. Ulrich
  • Baumeister, Wolfgang
  • Wilfling, Florian
Venue
bioRxiv (Cold Spring Harbor Laboratory)
Publisher
openRxiv
Published
2023-08-09
OpenAlex
W4385706842
Cited by
3
References
4
Citations by year
2024: 2 · 2023: 1
Type
posted content
Language
en
Open access
Licence
cc-by-nc-nd
Locations
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • UCL Discovery (University College London) (submittedVersion)
Funders
Michael J. Fox Foundation for Parkinson's Research (ASAP-000282)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Genetics (clinical) › Lysosomal Storage Disorders Research
Keywords
autophagy, polyglutamine aggregates, Huntington's disease, huntingtin, amyloid fibrils, aggrephagy, autophagosomes, p62, cryo-electron tomography, neurodegeneration, protein aggregation

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