Disease relevance of phosphorylated ubiquitin (p-S65-Ub).

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

Autophagy

journal_title

Autophagy

authors

Fiesel FC,Springer W

doi

10.1080/15548627.2015.1091912

subject

Has Abstract

pub_date

2015-11-02 00:00:00

pages

2125-2126

issue

11

eissn

1554-8627

issn

1554-8635

journal_volume

11

pub_type

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