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Phosphorylation of Parkin at Serine65 is essential for its activation in vivo

McWilliams, Thomas, Barini, Erica, Pohjolan-Pirhonen, Risto, Brooks, Simon, Singh, Francois, Burel, Sophie, Balk, Kristin, Kumar, Atul, Montava-Garriga, Lambert, Prescott, Alan, Hassoun, Sidi, Mouton-Liger, Francois, Ball, Graeme, Hills, Rachel, Knebel, Axel, Ulusoy, Ayse, Di Monte, Donato, Tamjar, Jevgenia, Antico, Odetta, Fears, Kyle, Smith, Laura, Brambilla, Riccardo, Palin, Eino, Valori, Miko, Eerola-Rautio, Johanna, Tienari, Pentti, Corti, Olga, Dunnett, Stephen, Ganley, Ian, Suomalainen, Anu and Muqit, Miratul 2018. Phosphorylation of Parkin at Serine65 is essential for its activation in vivo. Open Biology 8 , 180108. 10.1098/rsob.180108

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Abstract

Mutations in PINK1 and Parkin result in autosomal recessive Parkinson's disease (PD). Cell culture and in vitro studies have elaborated the PINK1-dependent regulation of Parkin and defined how this dyad orchestrates the elimination of damaged mitochondria via mitophagy. PINK1 phosphorylates ubiquitin at serine 65 (Ser65) and Parkin at an equivalent Ser65 residue located within its N-terminal ubiquitin-like domain, resulting in activation; however, the physiological significance of Parkin Ser65 phosphorylation in vivo in mammals remains unknown. To address this, we generated a Parkin Ser65Ala (S65A) knock-in mouse model. We observe endogenous Parkin Ser65 phosphorylation and activation in mature primary neurons following mitochondrial depolarization and reveal this is disrupted in ParkinS65A/S65A neurons. Phenotypically, ParkinS65A/S65A mice exhibit selective motor dysfunction in the absence of any overt neurodegeneration or alterations in nigrostriatal mitophagy. The clinical relevance of our findings is substantiated by the discovery of homozygous PARKIN (PARK2) p.S65N mutations in two unrelated patients with PD. Moreover, biochemical and structural analysis demonstrates that the ParkinS65N/S65N mutant is pathogenic and cannot be activated by PINK1. Our findings highlight the central role of Parkin Ser65 phosphorylation in health and disease.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Medicine
Publisher: The Royal Society
ISSN: 2046-2441
Date of First Compliant Deposit: 18 October 2018
Date of Acceptance: 9 October 2018
Last Modified: 28 Jun 2019 02:13
URI: http://orca.cf.ac.uk/id/eprint/115975

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