Journal of Bioenergetics and Biomembranes

, Volume 41, Issue 6, pp 499–503

The PINK1/Parkin pathway: a mitochondrial quality control system?

Article

DOI: 10.1007/s10863-009-9253-3

Cite this article as:
Whitworth, A.J. & Pallanck, L.J. J Bioenerg Biomembr (2009) 41: 499. doi:10.1007/s10863-009-9253-3

Abstract

Significant insight into the mechanisms that contribute to dopaminergic neurodegeneration in Parkinson disease has been gained from the analysis of genes linked to rare heritable forms of parkinsonism such as PINK1 and parkin, loss-of-function mutations of which cause autosomal recessive parkinsonism. PINK1 encodes a mitochondrially targeted Ser/Thr kinase and parkin encodes a ubiquitin-protein ligase. Functional studies of PINK1 and Parkin in animal and cellular model systems have shown that both proteins play important roles in maintaining mitochondrial integrity. Genetic studies of PINK1 and Parkin orthologs in flies have shown that PINK1 acts upstream from Parkin in a common pathway that appears to regulate mitochondrial morphology. Mitochondrial morphology is regulated by mitochondrial fission and fusion-promoting proteins, and is important in a variety of contexts, including mitochondrial trafficking and mitochondrial quality control. In particular, mitochondrial fission appears to promote the segregation of terminally dysfunctional mitochondria for degradation in the lysosome through a process termed mitophagy. Recent work has shown that Parkin promotes the degradation of dysfunctional mitochondria in vertebrate cell culture. Here we postulate a model whereby the PINK1/Parkin pathway regulates mitochondrial dynamics in an effort to promote the turnover of damaged mitochondria.

Keywords

Mitophagy Autophagy Turnover 

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.MRC Centre for Developmental and Biomedical GeneticsUniversity of SheffieldSheffieldUK
  2. 2.Department of Biomedical SciencesUniversity of SheffieldSheffieldUK
  3. 3.Department of Genome SciencesUniversity of WashingtonSeattleUSA