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Cited by 283

The DOI matches its Crossref record; 7 of the 7 references it cites were found in a registry or an index.

Parkin Facilitates the Elimination of Expanded Polyglutamine Proteins and Leads to Preservation of Proteasome Function

Open access
Tsai, Yien Che, Fishman, Paul S., Thakor, Nitish V., Oyler, George A.·2003·Journal of Biological Chemistry

Abstract

Parkin, the most commonly mutated gene in familial Parkinson's disease, encodes an E3 ubiquitin ligase. A number of candidate substrates have been identified for parkin ubiquitin ligase action including CDCrel-1, o-glycosylated alpha-synuclein, Pael-R, and synphilin-1. We now show that parkin promotes the ubiquitination and degradation of an expanded polyglutamine protein. Overexpression of parkin reduces aggregation and cytotoxicity of an expanded polyglutamine ataxin-3 fragment. Using a cellular proteasome indicator system based on a destabilized form of green fluorescent protein, we demonstrate that parkin reduces proteasome impairment and caspase-12 activation induced by an expanded polyglutamine protein. Parkin forms a complex with the expanded polyglutamine protein, heat shock protein 70 (Hsp70) and the proteasome, which may be important for the elimination of the expanded polyglutamine protein. Hsp70 enhances parkin binding and ubiquitination of expanded polyglutamine protein in vitro suggesting that Hsp70 may help to recruit misfolded proteins as substrates for parkin E3 ubiquitin ligase activity. We speculate that parkin may function to relieve endoplasmic reticulum stress by preserving proteasome activity in the presence of misfolded proteins. Loss of parkin function and the resulting proteasomal impairment may contribute to the accumulation of toxic aberrant proteins in neurodegenerative diseases including Parkinson's disease.

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Metadata

Authors
Tsai, Y. C., Fishman, P. S., Thakor, N. V., & Oyler, G. A.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2003-06
Volume
278
Issue
24
Pages
22044-22055
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2068806054
Cited by
283
References
7
FWCI
12.84
Type
journal article
Language
en
Open access
hybrid

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Tsai, Y. C., Fishman, P. S., Thakor, N. V., & Oyler, G. A. (2003). Parkin Facilitates the Elimination of Expanded Polyglutamine Proteins and Leads to Preservation of Proteasome Function. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.m212235200

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