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Reactive oxygen species-mediated DJ-1 monomerization modulates intracellular trafficking involving karyopherin beta 2
The Norwegian Center for Movement Disorders, Stavanger University Hospital, Stavanger, Norway ; Center for Organelle Research, University of Stavanger, Stavanger, Norway.
The Norwegian Center for Movement Disorders, Stavanger University Hospital, Stavanger, Norway ; Center for Organelle Research, University of Stavanger, Stavanger, Norway.
Department of Molecular and Applied Biosciences, University of Westminster, London, United Kingdom.
Department of Molecular and Applied Biosciences, University of Westminster, London, United Kingdom.
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2014 (English)In: Molecular and Cellular Biology, ISSN 0270-7306, E-ISSN 1098-5549, Vol. 34, no 16, 3024-3040 p.Article in journal (Refereed) Published
Abstract [en]

Mutations in DJ-1 are a cause of recessive, early-onset Parkinson's disease (PD). Although oxidative stress and mitochondrial integrity have been implicated in PD, it is largely unknown why neurons degenerate. DJ-1 is involved in oxidative stress-mediated responses and in mitochondrial maintenance; however, its specific function remains vague. Here we show that DJ-1 exhibits neuronal dynamic intracellular trafficking, with dimeric/monomeric cycling modulated by the oxidative environment. We demonstrate that oxidative stress enhances monomerization of wild-type cytosolic DJ-1, leading to nuclear recruitment. The pathogenic DJ-1/E163K variant is unable to homodimerize but is retained in the cytosol upon wild-type DJ-1 heterodimerization. We found that this wild-type/pathogenic heterodimer is disrupted by oxidative stress, leading to DJ-1/E163K mitochondrial translocation. We further demonstrated that endogenously expressed wild-type DJ-1 is imported into neuronal nuclei as a monomer and that nucleo-cytoplasmic transport is oxidative stress mediated. We identified a novel proline-tyrosine nuclear localization signal (PY-NLS) in DJ-1, and we found that nuclear monomeric DJ-1 import is mediated by an oxidative stress-dependent interaction with karyopherin beta 2. Our study provides evidence that oxidative stress-mediated intracellular trafficking of DJ-1, mediated by dynamic DJ-1 dimeric/monomeric cycling, is implicated in PD pathogenesis.

Place, publisher, year, edition, pages
2014. Vol. 34, no 16, 3024-3040 p.
National Category
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
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URN: urn:nbn:se:umu:diva-91827DOI: 10.1128/MCB.00286-14ISI: 000339381000006OAI: oai:DiVA.org:umu-91827DiVA: diva2:742354
Available from: 2014-09-01 Created: 2014-08-18 Last updated: 2017-12-05Bibliographically approved

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Björkblom, Benny
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