Parkin is ubiquitinated by Nrdp1 and abrogates Nrdp1-induced oxidative stress

Neurosci Lett. 2008 Jul 25;440(1):4-8. doi: 10.1016/j.neulet.2008.05.052. Epub 2008 May 18.

Abstract

Parkin plays an important role in the pathogenesis of Parkinson's disease. We previously described that Nrdp1, a RING-finger ubiquitin E3 ligase, interacted with Parkin by the yeast two-hybrid assay and by co-immunoprecipitation. Here we further demonstrated that overexpression of Nrdp1 significantly reduced the endogenous Parkin level in an Nrdp1 dosage-dependent and proteasome-dependent manner. More importantly, Nrdp1 ubiquitinated Parkin and catalyzed the poly-ubiquitin chains on Parkin in vitro as well as in cells, indicating Parkin is an Nrdp1 substrate. In addition, we demonstrated that overexpression of Nrdp1 increased the production of reactive oxygen species (ROS), which was abrogated by co-expression of Parkin. Conversely, suppression of Nrdp1 by shRNA conferred SH-SY5Y cells a lower ROS level. Together, we provided evidence that interactions between Nrdp1 and Parkin negatively regulated Parkin level and affected ROS production, suggesting that Nrdp1 may play a role in Parkinson's disease.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line
  • Dose-Response Relationship, Drug
  • Gene Expression Regulation / drug effects
  • Humans
  • Immunoprecipitation / methods
  • Mutation / physiology
  • Oxidative Stress / drug effects*
  • Oxidative Stress / physiology
  • RNA, Small Interfering / pharmacology
  • Reactive Oxygen Species / metabolism
  • Transfection / methods
  • Ubiquitin-Protein Ligases / genetics
  • Ubiquitin-Protein Ligases / metabolism*
  • Ubiquitin-Protein Ligases / pharmacology
  • Ubiquitin-Protein Ligases / physiology*
  • Ubiquitination / physiology*

Substances

  • RNA, Small Interfering
  • Reactive Oxygen Species
  • RNF41 protein, human
  • Ubiquitin-Protein Ligases
  • parkin protein