Cited by 417Parkinson's Disease Mechanisms and TreatmentsUbiquitin and proteasome pathwaysAlzheimer's disease research and treatments

Degradation of α-Synuclein by Proteasome

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Bennett, M. Catherine, Bishop, John F., Leng, Yan, Chock, P. Boon, Chase, Thomas N., Mouradian, M. Maral·1999·Journal of Biological Chemistry

Abstract

Mutations in alpha-synuclein are known to be associated with Parkinson's disease (PD). The coexistence of this neuronal protein with ubiquitin and proteasome subunits in Lewy bodies in sporadic disease suggests that alterations of alpha-synuclein catabolism may contribute to the pathogenesis of PD. The degradation pathway of alpha-synuclein has not been identified nor has the kinetics of this process been described. We investigated the degradation kinetics of both wild-type and A53T mutant 6XHis-tagged alpha-synuclein in transiently transfected SH-SY5Y cells. Degradation of both isoforms followed first-order kinetics over 24 h as monitored by the pulse-chase method. However, the t((1)/(2)) of mutant alpha-synuclein was 50% longer than that of the wild-type protein (p < 0.01). The degradation of both recombinant proteins and endogenous alpha-synuclein in these cells was blocked by the selective proteasome inhibitor beta-lactone (40 microM), indicating that both wild-type and A53T mutant alpha-synuclein are degraded by the ubiquitin-proteasome pathway. The slower degradation of mutant alpha-synuclein provides a kinetic basis for its intracellular accumulation, thus favoring its aggregation.

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  1. Spillantini, M. G., Crowther, R. A., Jakes, R., Hasegawa, M., and Goedert, M. (1998) Proc. Natl. Acad. Sci. U. S. A. 95, 6469 -6473
  2. Ueda, K., Fukushima, H., Masliah, E., Xia, Y., Iwai, A., Yoshimoto, M., Otero, D. A., Kondo, J., Ihara, Y., and Saitoh, T. (1993) Proc. Natl. Acad. Sci.

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Authors
Bennett, M. C., Bishop, J. F., Leng, Y., Chock, P. B., Chase, T. N., & Mouradian, M. M.
Affiliations
  • National Institutes of Health (US)
  • National Institute of Neurological Disorders and Stroke (US)
Corresponding author
Mouradian, M. Maral
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1999-11
Volume
274
Issue
48
Pages
33855-33858
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2027649342
Cited by
417
References
21
Citations by year
2026: 3 · 2025: 7 · 2024: 12 · 2023: 10 · 2022: 13 · 2021: 14 · 2020: 16 · 2019: 9 · 2018: 12 · 2017: 11 · 2016: 12 · 2015: 10 · 2014: 13 · 2013: 17 · 2012: 19
FWCI
18.35
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
alpha-synuclein, proteasome, protein degradation kinetics, Parkinson's disease, A53T mutation, ubiquitin-proteasome system, Lewy bodies, protein aggregation, SH-SY5Y cells, pulse-chase
MeSH terms
Cysteine Endopeptidases, Humans, Kinetics, Lactones, Multienzyme Complexes, Mutation, Nerve Tissue Proteins, Recombinant Fusion Proteins, Tumor Cells, Cultured, Proteasome Endopeptidase Complex, Synucleins, alpha-Synuclein

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