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Mutations in PINK1 and Parkin Impair Ubiquitination of Mitofusins in Human Fibroblasts
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Mutations in PINK1 and Parkin Impair Ubiquitination of Mitofusins in Human Fibroblasts
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Journal Article
Mutations in PINK1 and Parkin Impair Ubiquitination of Mitofusins in Human Fibroblasts
2011
Overview
PINK1 and Parkin mutations cause recessive Parkinson's disease (PD). In Drosophila and SH-SY5Y cells, Parkin is recruited by PINK1 to damaged mitochondria, where it ubiquitinates Mitofusins and consequently promotes mitochondrial fission and mitophagy.Here, we investigated the impact of mutations in endogenous PINK1 and Parkin on the ubiquitination of mitochondrial fusion and fission factors and the mitochondrial network structure. Treating control fibroblasts with mitochondrial membrane potential (Δψ) inhibitors or H(2)O(2) resulted in ubiquitination of Mfn1/2 but not of OPA1 or Fis1. Ubiquitination of Mitofusins through the PINK1/Parkin pathway was observed within 1 h of treatment. Upon combined inhibition of Δψ and the ubiquitin proteasome system (UPS), no ubiquitination of Mitofusins was detected. Regarding morphological changes, we observed a trend towards increased mitochondrial branching in PD patient cells upon mitochondrial stress.For the first time in PD patient-derived cells, we demonstrate that mutations in PINK1 and Parkin impair ubiquitination of Mitofusins. In the presence of UPS inhibitors, ubiquitinated Mitofusin is deubiquitinated by the UPS but not degraded, suggesting that the UPS is involved in Mitofusin degradation.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Biology
/ Carbonyl Cyanide m-Chlorophenyl Hydrazone - pharmacology
/ Disease
/ DNA
/ Fission
/ Genomes
/ GTP Phosphohydrolases - metabolism
/ Humans
/ Hydrogen Peroxide - pharmacology
/ Insects
/ Kinases
/ Medicine
/ Membrane Proteins - metabolism
/ Membrane Transport Proteins - metabolism
/ Mitochondrial Membrane Transport Proteins
/ Mitochondrial Proteins - metabolism
/ Mutation
/ Oligopeptides - pharmacology
/ Proteasome Endopeptidase Complex - metabolism
/ Protein Transport - drug effects
/ Proteins
/ PTEN-induced putative kinase
/ Rodents
/ Studies
/ Ubiquitin-Protein Ligases - genetics
