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FBXO7/ntc and USP30 antagonistically set the ubiquitination threshold for basal mitophagy and provide a target for Pink1 phosphorylation in vivo

Published version
Peer-reviewed

Repository DOI


Type

Article

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Authors

Sanchez-Martinez, Alvaro  ORCID logo  https://orcid.org/0000-0002-2728-6251
Whitworth, Alexander J  ORCID logo  https://orcid.org/0000-0002-1154-6629

Abstract

Functional analyses of genes linked to heritable forms of Parkinson's disease have revealed fundamental insights into the biological processes underpinning pathogenic mechanisms. Mutations in PARK15/FBXO7 cause autosomal recessive PD and FBXO7 has been shown to regulate mitochondrial homeostasis. We investigated the extent to which FBXO7 and its Drosophila orthologue, ntc, share functional homology and explored its role in mitophagy in vivo. We show that ntc mutants partially phenocopy Pink1 and parkin mutants and ntc overexpression supresses parkin phenotypes. Furthermore, ntc can modulate basal mitophagy in a Pink1- and parkin- independent manner by promoting the ubiquitination of mitochondrial proteins, a mechanism that is opposed by the deubiquitinase USP30. This basal ubiquitination serves as the substrate for Pink1-mediated phosphorylation which triggers damage- induced mitophagy. We propose that FBXO7/ntc works in equilibrium with USP30 to provide a checkpoint for mitochondrial quality control in basal conditions in vivo and presents a new avenue for therapeutic approaches.

Description

Keywords

3101 Biochemistry and Cell Biology, 31 Biological Sciences, Parkinson's Disease, Brain Disorders, Neurosciences, Neurodegenerative, Neurological

Journal Title

PLoS Biology

Conference Name

Journal ISSN

1544-9173
1545-7885

Volume Title

Publisher

Public Library of Science (PLoS)
Sponsorship
MRC (MC_UU_00028/6)