Degradation of α-Synuclein by Proteasome
Open accessAbstract
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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α-Synuclein is degraded by proteasomes, and phosphorylated α-synuclein is ubiquitinated in α-synucleinopathy lesions, indicating that the ubiquitin-proteasome system degrades phosphorylated synuclein.
“α-Synuclein is degraded by proteasomes [106,107], and phosphorylated α-synuclein is ubiquitinated in α-synucleinopathy lesions [108], indicating that the ubiquitin-proteasome system degrades phosphorylated synuclein.”
From Degradation of Tyrosine Hydroxylase by the Ubiquitin-Proteasome System in the Pathogenesis of Parkinson’s Disease and Dopa-Responsive Dystonia (2020) · cites this paper as [106]
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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
- hybrid
- doi.org
- Licence
- 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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