Parkin Mono-ubiquitinates Bcl-2 and Regulates Autophagy

Chen, Dong; Gao, Feng; Li, Bin; Wang, Hongfeng; Xu, Yan; Zhu, Changhong; Wang, Guanghui

doi:10.1074/jbc.m110.101469

Cited by 151 publications

(121 citation statements)

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“…In another study, it was found that while Parkin overexpression stimulates CCCP-induced mitophagy, it appears to inhibit bulk autophagy under basal conditions. 65 This observation suggests that Parkin may differentially regulate distinct types of autophagy.…”

Section: The Pink1/parkin Pathway Of Mitophagymentioning

confidence: 93%

The pathways of mitophagy for quality control and clearance of mitochondria

2012

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Selective autophagy of mitochondria, known as mitophagy, is an important mitochondrial quality control mechanism that eliminates damaged mitochondria. Mitophagy also mediates removal of mitochondria from developing erythrocytes, and contributes to maternal inheritance of mitochondrial DNA through the elimination of sperm-derived mitochondria. Recent studies have identified specific regulators of mitophagy that ensure selective sequestration of mitochondria as cargo. In yeast, the mitochondrial outer membrane protein autophagy-related gene 32 (ATG32) recruits the autophagic machinery to mitochondria, while mammalian Nix is required for degradation of erythrocyte mitochondria. The elimination of damaged mitochondria in mammals is mediated by a pathway comprised of PTEN-induced putative protein kinase 1 (PINK1) and the E3 ubiquitin ligase Parkin. PINK1 and Parkin accumulate on damaged mitochondria, promote their segregation from the mitochondrial network, and target these organelles for autophagic degradation in a process that requires Parkin-dependent ubiquitination of mitochondrial proteins. Here we will review recent advances in our understanding of the different pathways of mitophagy. In addition, we will discuss the relevance of these pathways in neurons where defects in mitophagy have been implicated in neurodegeneration. Facts Mitophagy mediates clearance of damaged mitochondria, and is also involved in the removal of mitochondria from maturing erythrocytes and eliminating sperm-derived mitochondria after fertilization. In yeast, the mitochondrial outer membrane protein autophagy-related gene 32 (ATG32) recruits the core autophagic machinery to mitochondria for their selective removal. A pathway containing PTEN-induced putative protein kinase 1 (PINK1) and Parkin responds to loss of mitochondrial membrane potential by targeting damaged mitochondria for clearance. The PINK1/Parkin pathway is triggered when PINK1 is stabilized on the outer membrane of damaged mitochondria, where it facilitates recruitment of cytosolic Parkin. Damaged mitochondria are prevented from moving and fusing with the mitochondrial reticulum in preparation for their mitophagic clearance. Open QuestionsHow distinct are the mitophagy pathways triggered by different stimuli or conditions?To what extent does Parkin activate mitophagy by causing the degradation of mitochondrial surface proteins or hyperubiquitinating the mitochondrial surface? How do PINK1 and Parkin interact with one another and with substrates on the mitochondrial surface in causing mitophagy? In contrast to the remarkable conservation of the core autophagic machinery, why are mitophagy-specific genes so little conserved between yeast and mammals? How best should mitophagy be triggered by researchers probing physiologically relevant pathways?The mitochondrion is an important actor in the life of a eukaryotic cell, but, like all good actors, a mitochondrion needs to exit the stage at the right time. Mitophagy removes mitochondria once they have played their part. This artic...

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Section: The Pink1/parkin Pathway Of Mitophagymentioning

confidence: 93%

The pathways of mitophagy for quality control and clearance of mitochondria

2012

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“…The EGFP, EGFP-parkin, EGFP-parkin K161N, EGFP-parkin T240R, Flag, Flag-parkin, and EGFP-p62 constructs have been previously described [26,27] .…”

Section: Plasmidsmentioning

confidence: 99%

Parkin represses 6-hydroxydopamine-induced apoptosis via stabilizing scaffold protein p62 in PC12 cells

Hou

Ren

et al. 2015

Acta Pharmacol Sin

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Aim: Parkin has been shown to exert protective effects against 6-hydroxydopamine (6-OHDA)-induced neurotoxicity in different models of Parkinson disease. In the present study we investigated the molecular mechanisms underlying the neuroprotective action of parkin in vitro. Methods: HEK293, HeLa and PC12 cells were transfected with parkin, parkin mutants, p62 or si-p62. Protein expression and ubiquitination were assessed using immunoblot analysis. Immunoprecipitation assay was performed to identify the interaction between parkin and scaffold protein p62. PC12 and SH-SY5Y cells were treated with 6-OHDA (200 μmol/L), and cell apoptosis was detected using PI and Hoechst staining. Results: In HEK293 cells co-transfected with parkin and p62, parkin was co-immunoprecipitated with p62, and parkin overexpression increased p62 protein levels. In parkin-deficient HeLa cells, transfection with wild-type pakin, but not with ligase activity-deficient pakin mutants, significantly increased p62 levels, suggesting that parkin stabilized p62 through its E3 ligase activity. Transfection with parkin or p62 significantly repressed ERK1/2 phosphorylation in HeLa cells, but transfection with parkin did not repress ERK1/2 phosphorylation in p62-knockdown HeLa cells, suggesting that p62 was involved in parkin-induced inhibition on ERK1/2 phosphorylation. Overexpression of parkin or p62 significantly repressed 6-OHDA-induced ERK1/2 phosphorylation in PC12 cells, and parkin overexpression inhibited 6-OHDA-induced apoptosis in PC12 and SH-SY5Y cells. Conclusion: Parkin protects PC12 cells against 6-OHDA-induced apoptosis via ubiquitinating and stabilizing scaffold protein p62, and repressing ERK1/2 activation.

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“…However, the precise role of Parkin in the induction of mitophagy has not been fully elucidated. To date, several mitochondrial proteins, voltage-dependent anion channel 1 (VDAC1) (8), mitofusin (a mitochondrial pro-fusion factor) (11,14,15), Bcl-2 (16), and Drp1 (17), have been shown to be ubiquitinated by Parkin. Ubiquitination of VDAC1 may recruit the autophagy adaptor p62, which interacts with microtubule-associated protein light chain 3 (LC3) on the autophagosomal membrane (8); however, the requirement of p62 remains controversial (18 -21).…”

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confidence: 99%

Parkin Mediates Proteasome-dependent Protein Degradation and Rupture of the Outer Mitochondrial Membrane

Yoshii

Kishi

Ishihara

et al. 2011

Journal of Biological Chemistry

551

463

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Upon mitochondrial depolarization, Parkin, a Parkinson disease-related E3 ubiquitin ligase, translocates from the cytosol to mitochondria and promotes their degradation by mitophagy, a selective type of autophagy. Here, we report that in addition to mitophagy, Parkin mediates proteasome-dependent degradation of outer membrane proteins such as Tom20, Tom40, Tom70, and Omp25 of depolarized mitochondria. By contrast, degradation of the inner membrane and matrix proteins largely depends on mitophagy. Furthermore, Parkin induces rupture of the outer membrane of depolarized mitochondria, which also depends on proteasomal activity. Upon induction of mitochondrial depolarization, proteasomes are recruited to mitochondria in the perinuclear region. Neither proteasome-dependent degradation of outer membrane proteins nor outer membrane rupture is required for mitophagy. These results suggest that Parkin regulates degradation of outer and inner mitochondrial membrane proteins differently through proteasome-and mitophagydependent pathways.Parkinson disease is a progressive neurodegenerative disease that is characterized by postural changes, resting tremor, muscle rigidity, and weakness (1, 2). These symptoms are mainly caused by loss of dopaminergic neurons in the substantia nigra, and mitochondrial dysfunction appears to be the primary pathogenic event. Indeed, many of the products of Parkinson disease-related genes such as ␣-synuclein/PARK1/4, PARKIN/ PARK2, PINK1/PARK6, DJ-I/PARK7, and OMI/HTRA2 are physically and functionally linked to mitochondria (3,4).Parkin is a RING domain-containing E3 ubiquitin ligase, and its mutation causes autosomal recessive juvenile Parkinson disease (5). Recent studies have revealed that Parkin is important for mitochondrial quality control through degradation of damaged mitochondria. Narendra et al. (6) first demonstrated that Parkin translocates from the cytosol to depolarized mitochondria and triggers elimination of these mitochondria by autophagy, which is known as mitophagy. Targeting of Parkin to mitochondria requires PTEN-induced putative kinase 1 (Pink1), 3 another Parkinson disease-associated gene product (7-14). Pink1 is an extremely unstable mitochondrial protein, but it is stabilized upon mitochondrial depolarization and subsequently recruits Parkin.Autophagy is a membrane-mediated intracellular degradation process. A portion of cytoplasm is first enclosed by the double-membraned autophagosome, and the autophagosome then fuses with a lysosome to degrade the enclosed materials. Although autophagy has been thought to be mainly non-selective, recent studies have revealed that the autophagosomal membrane can recognize some specific proteins and organelles. Parkin-mediated autophagy of damaged mitochondria is one of the best examples of selective autophagy. However, the precise role of Parkin in the induction of mitophagy has not been fully elucidated. To date, several mitochondrial proteins, voltage-dependent anion channel 1 (VDAC1) (8), mitofusin (a mitochondrial pro-fusion factor)...

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Parkin Mono-ubiquitinates Bcl-2 and Regulates Autophagy

Cited by 151 publications

References 51 publications

The pathways of mitophagy for quality control and clearance of mitochondria

The pathways of mitophagy for quality control and clearance of mitochondria

Parkin represses 6-hydroxydopamine-induced apoptosis via stabilizing scaffold protein p62 in PC12 cells

Parkin Mediates Proteasome-dependent Protein Degradation and Rupture of the Outer Mitochondrial Membrane

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