Abstract:
:Here, we present a summary of our recent findings on the (patho-)physiological relevance of PINK1-phosphorylated ubiquitin (p-S65-Ub). Using novel polyclonal antibodies, we find that p-S65-Ub specifically accumulates on damaged mitochondria. Phosphorylation of ubiquitin on serine 65 depends on the activity of PINK1 and the signal is vastly amplified by the activity of the E3 ubiquitin ligase PARK2/Parkin in a feed-forward loop. The induction of p-S65-Ub in primary cells suggests a significant role of p-S65-Ub also in neurons. Consistent with a marker for damaged mitochondria that are undergoing mitophagy, we find anti-p-S65-Ub immunoreactive granules that partially colocalize with mitochondria, lysosomes and ubiquitin in human post-mortem brain. The number of p-S65-Ub positive granules increases with age and with PD, highlighting the relevance of p-S65-Ub as a potential biomarker and therapeutic target.
journal_name
Autophagyjournal_title
Autophagyauthors
Fiesel FC,Springer Wdoi
10.1080/15548627.2015.1091912subject
Has Abstractpub_date
2015-11-02 00:00:00pages
2125-2126issue
11eissn
1554-8627issn
1554-8635journal_volume
11pub_type
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