PMID:17766438

Citation	Andres-Mateos, E, Perier, C, Zhang, L, Blanchard-Fillion, B, Greco, TM, Thomas, B, Ko, HS, Sasaki, M, Ischiropoulos, H, Przedborski, S, Dawson, TM and Dawson, VL (2007) DJ-1 gene deletion reveals that DJ-1 is an atypical peroxiredoxin-like peroxidase. Proc. Natl. Acad. Sci. U.S.A. 104:14807-12
Abstract	Parkinson's disease (PD) is a common neurodegenerative movement disorder. Whereas the majority of PD cases are sporadic, rare genetic defects have been linked to this prevalent movement disorder. Mutations in DJ-1 are associated with autosomal recessive early-onset PD. The exact biochemical function of DJ-1 has remained elusive. Here we report the generation of DJ-1 knockout (KO) mice by targeted deletion of exon 2 and exon 3. There is no observable degeneration of the central dopaminergic pathways, and the mice are anatomically and behaviorally similar to WT mice. Fluorescent Amplex red measurements of H(2)O(2) indicate that isolated mitochondria from young and old DJ-1 KO mice have a 2-fold increase in H(2)O(2). DJ-1 KO mice of 2-3 months of age have a 60% reduction in mitochondrial aconitase activity without compromising other mitochondrial processes. At an early age there are no differences in antioxidant enzymes, but in older mice there is an up-regulation of mitochondrial manganese superoxide dismutase and glutathione peroxidase and a 2-fold increase in mitochondrial glutathione peroxidase activity. Mutational analysis and mass spectrometry reveal that DJ-1 is an atypical peroxiredoxin-like peroxidase that scavenges H(2)O(2) through oxidation of Cys-106. In vivo there is an increase of DJ-1 oxidized at Cys-106 after 1-methyl-4-phenyl-1,2,3,6 tetrahydropyridine intoxication of WT mice. Taken together these data indicate that the DJ-1 KO mice have a deficit in scavenging mitochondrial H(2)O(2) due to the physiological function of DJ-1 as an atypical peroxiredoxin-like peroxidase.
Links	PubMed PMC1976193 Online version:10.1073/pnas.0703219104
Keywords	Aging/physiology; Animals; Cysteine/metabolism; DNA Mutational Analysis; Exons; Gene Deletion; Glutathione Peroxidase/analysis; Glutathione Peroxidase/metabolism; Humans; Hydrogen Peroxide/analysis; Hydrogen Peroxide/metabolism; Immunohistochemistry; Mass Spectrometry; Mice; Mice, Knockout; Mitochondria/enzymology; Oncogene Proteins/genetics; Oxidation-Reduction; Parkinson Disease/genetics; Parkinson Disease/pathology; Peroxidase/genetics; Peroxidases/genetics; Peroxiredoxins; Superoxide Dismutase/analysis; Superoxide Dismutase/metabolism
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