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Aggregated and Monomeric α-Synuclein Bind to the S6′ Proteasomal Protein and Inhibit Proteasomal Function
Open accessAbstract
The accumulation of aggregated alpha-synuclein is thought to contribute to the pathophysiology of Parkinson's disease, but the mechanism of toxicity is poorly understood. Recent studies suggest that aggregated proteins cause toxicity by inhibiting the ubiquitin-dependent proteasomal system. In the present study, we explore how alpha-synuclein interacts with the proteasome. The proteasome exists as a 26 S and a 20 S species. The 26 S proteasome is composed of the 19 S cap and the 20 S core. Aggregated alpha-synuclein strongly inhibited the function of the 26 S proteasome. The IC(50) of aggregated alpha-synuclein for ubiquitin-independent 26 S proteasomal activity was 1 nm. Aggregated alpha-synuclein also inhibited 26 S ubiquitin-dependent proteasomal activity at a dose of 500 nm. In contrast, the IC(50) of aggregated alpha-synuclein for 20 S proteasomal activity was > 1 microm. This suggests that aggregated alpha-synuclein selectively interacts with the 19 S cap. Monomeric alpha-synuclein also inhibited proteasomal activity but with lower affinity and less potency. Recombinant monomeric alpha-synuclein inhibited the activity of the 20 S proteasomal core with an IC(50) > 10 microm, exhibited no inhibition of 26 S ubiquitin-dependent proteasomal activity at doses up to 5 microm, and exhibited only partial inhibition (50%) of the 26 S ubiquitin-independent proteasomal activity at doses up to 10 mm. Binding studies demonstrate that both aggregated and monomeric alpha-synuclein selectively bind to the proteasomal protein S6', a subunit of the 19 S cap. These studies suggest that proteasomal inhibition by aggregated alpha-synuclein could be mediated by interaction with S6'.
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Cited by
Dauer, W., & Przedborski, S. (2003) · Neuron · doi:10.1016/s0896-6273(03)00568-3 · Cited by 5,469
Balestrino, R., & Schapira, A. H. V. (2020) · European Journal of Neurology · doi:10.1111/ene.14108 · Cited by 1,508
-Synuclein in Parkinson's Disease
Stefanis, L. (2012) · Cold Spring Harbor Perspectives in Medicine · doi:10.1101/cshperspect.a009399 · Cited by 1,446
Degradation of misfolded proteins in neurodegenerative diseases: Therapeutic targets and strategies
Ciechanover, A., & Kwon, Y. T. (2015) · Experimental & Molecular Medicine · doi:10.1038/emm.2014.117 · Cited by 898
α-Synuclein impairs macroautophagy: implications for Parkinson’s disease
Winslow, A. R., Chen, C.-W., Corrochano, S., Acevedo-Arozena, A., Gordon, D. E., Peden, A. A., Lichtenberg, M., Menzies, F. M., Ravikumar, B., Imarisio, S., et al. (2010) · Journal of Cell Biology · doi:10.1083/jcb.201003122 · Cited by 825
“…JCB 1023 Correspondence to David C. Rubinsztein: dcr1000@hermes.cam.ac.uk Abbreviations used in this paper: ANOVA, analysis of variance; CMA, chaperonemediated autophagy; HD, Huntington’s disease; PD, Parkinson’s disease; PI(3)P, phosphatidylinositol-3-phosphate.”
Influential
Metadata
- Authors
- Snyder, H., Mensah, K., Theisler, C., Lee, J., Matouschek, A., & Wolozin, B.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2003-04
- Volume
- 278
- Issue
- 14
- Pages
- 11753-11759
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2116598203
- Cited by
- 420
- References
- 54
- FWCI
- 18.85
- Type
- journal article
- Language
- en
- Open access
- hybrid
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