Parkin Precipitates on Mitochondria via Aggregation and Autoubiquitination

4Citations
Citations of this article
8Readers
Mendeley users who have this article in their library.

Abstract

The loss of the E3 ligase Parkin, in a familial form of Parkinson’s disease, is thought to cause the failure of both the polyubiquitination of abnormal mitochondria and the consequent induction of mitophagy, resulting in abnormal mitochondrial accumulation. However, this has not been confirmed in patient autopsy cases or animal models. More recently, the function of Parkin as a redox molecule that directly scavenges hydrogen peroxide has attracted much attention. To determine the role of Parkin as a redox molecule in the mitochondria, we overexpressed various combinations of Parkin, along with its substrates FAF1, PINK1, and ubiquitin in cell culture systems. Here, we observed that the E3 Parkin monomer was surprisingly not recruited to abnormal mitochondria but self-aggregated with or without self-ubiquitination into the inner and outer membranes, becoming insoluble. Parkin overexpression alone generated aggregates without self-ubiquitination, but it activated autophagy. These results suggest that for damaged mitochondria, the polyubiquitination of Parkin substrates on the mitochondria is not indispensable for mitophagy.

Cite

CITATION STYLE

APA

Ardah, M. T., Radwan, N., Khan, E., Kitada, T., & Haque, M. E. (2023). Parkin Precipitates on Mitochondria via Aggregation and Autoubiquitination. International Journal of Molecular Sciences, 24(10). https://doi.org/10.3390/ijms24109027

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free