Journal
JOURNAL OF NEUROCHEMISTRY
Volume 118, Issue 4, Pages 636-645Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1471-4159.2011.07318.x
Keywords
Mfn1; mitochondria; mitophagy; parkin; Parkinson's disease; ubiquitination
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Funding
- Swiss National Science Foundation [310030_127478]
- Ecole Polytechnique Federale de Lausanne (EPFL)
- Swiss National Science Foundation (SNF) [310030_127478] Funding Source: Swiss National Science Foundation (SNF)
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Mutations in the parkin gene cause early-onset, autosomal recessive Parkinson's disease. Parkin functions as an E3 ubiquitin ligase to mediate the covalent attachment of ubiquitin monomers or linked chains to protein substrates. Substrate ubiquitination can target proteins for proteasomal degradation or can mediate a number of non-degradative functions. Parkin has been shown to preserve mitochondrial integrity in a number of experimental systems through the regulation of mitochondrial fission. Upon mitochondrial damage, parkin translocates to mitochondria to mediate their selective elimination by autophagic degradation. The mechanism underlying this process remains unclear. Here, we demonstrate that parkin interacts with and selectively mediates the atypical poly-ubiquitination of the mitochondrial fusion factor, mitofusin 1, leading to its enhanced turnover by proteasomal degradation. Our data supports a model whereby the translocation of parkin to damaged mitochondria induces the degradation of mitofusins leading to impaired mitochondrial fusion. This process may serve to selectively isolate damaged mitochondria for their removal by autophagy.
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