Global Landscape and Dynamics of Parkin and USP30-dependent ubiquitylomes in iNeurons during mitophagic signaling
- Author(s)
- Ordureau, A; Paulo, JA; Zhang, J; An, H; Swatek, KN; Cannon, JR; Wan, Q; Komander, D; Harper, JW;
- Details
- Publication Year 2020-03-05,Volume 77,Issue #5,Page 1124-1142 e10
- Journal Title
- Molecular Cell
- Publication Type
- Journal Article
- Abstract
- The ubiquitin ligase Parkin, protein kinase PINK1, USP30 deubiquitylase, and p97 segregase function together to regulate turnover of damaged mitochondria via mitophagy, but our mechanistic understanding in neurons is limited. Here, we combine induced neurons (iNeurons) derived from embryonic stem cells with quantitative proteomics to reveal the dynamics and specificity of Parkin-dependent ubiquitylation under endogenous expression conditions. Targets showing elevated ubiquitylation in USP30(-/-) iNeurons are concentrated in components of the mitochondrial translocon, and the ubiquitylation kinetics of the vast majority of Parkin targets are unaffected, correlating with a modest kinetic acceleration in accumulation of pS65-Ub and mitophagic flux upon mitochondrial depolarization without USP30. Basally, ubiquitylated translocon import substrates accumulate, suggesting a quality control function for USP30. p97 was dispensable for Parkin ligase activity in iNeurons. This work provides an unprecedented quantitative landscape of the Parkin-modified ubiquitylome in iNeurons and reveals the underlying specificity of central regulatory elements in the pathway.
- Publisher
- Cell Press
- Research Division(s)
- Ubiquitin Signalling
- PubMed ID
- 32142685
- Publisher's Version
- https://doi.org/10.1016/j.molcel.2019.11.013
- Terms of Use/Rights Notice
- Refer to copyright notice on published article.
Creation Date: 2020-03-24 01:39:42
Last Modified: 2020-03-24 02:23:38