PRKN — Parkin RBR E3 Ubiquitin Protein Ligase

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gene1275 wordssynced 2026-04-02

PRKN — Parkin RBR E3 Ubiquitin Protein Ligase

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">PRKN — Parkin RBR E3 Ubiquitin Protein Ligase</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>PRKN</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Parkin RBR E3 Ubiquitin Protein Ligase</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>6q26</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/5071" target="_blank">5071</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000185348" target="_blank">ENSG00000185348</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/602544" target="_blank">602544</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/O60260" target="_blank">O60260</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Parkinson's Disease](/diseases/parkinsons-disease), [Parkinsonism](/diseases/parkinsonsism), [Lysosomal Storage Disorders](/diseases/lysosomal-storage-disorders)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Substantia nigra, Striatum, [Cortex](/brain-regions/cortex), Heart, Skeletal muscle</td>
</tr>
<tr>
<th class="infobox-subheader" colspan="2">Key Functions</th>
</tr>
<tr>
<td colspan="2" style="font-size:0.85em">E3 ubiquitin ligase<br>Mitochondrial quality control<br>Mito

...

PRKN — Parkin RBR E3 Ubiquitin Protein Ligase

Overview

PRKN (Parkin RBR E3 Ubiquitin Protein Ligase), commonly known as Parkin, is a gene located on chromosome 6q26 that encodes an E3 ubiquitin ligase essential for mitochondrial quality control and mitophagy[@kitada1998]. Pathogenic mutations in PRKN are among the most common causes of autosomal recessive early-onset Parkinson's disease (PD), accounting for approximately 50% of familial PD cases and 10-20% of early-onset sporadic PD[@singleton2012].

Parkin functions as a key mediator of the PINK1-Parkin pathway, which senses mitochondrial damage and targets dysfunctional mitochondria for degradation through mitophagy[@pickrell2015]. This pathway is particularly important in dopaminergic [neurons](/entities/neurons) of the substantia nigra, which have high metabolic demands and are particularly vulnerable to mitochondrial dysfunction.

The discovery of PRKN mutations in familial Parkinson's disease in 1998 provided the first genetic link to mitochondrial dysfunction in PD pathogenesis, establishing the mitochondrial cascade hypothesis of PD[@trancikova2011].

Molecular Biology and Structure

Protein Structure

Parkin is a 465-amino acid protein belonging to the RBR (Ring-Between-Ring) family of E3 ubiquitin ligases[@riley2013]:

Unique Palmitoylation Site: Cysteine 431 for membrane association
RING0 domain: Inhibitory regulatory domain
RING1 domain: Binds E2 ubiquitin-conjugating enzymes
InBetweenRING (IBR) domain: Intermediate domain
RING2 domain: Catalytic domain with zinc-finger motif
Repressor element: N-terminal ubiquitin-like (Ubl) domain

Ubiquitination Function

Parkin catalyzes multiple types of ubiquitin linkages:

K48-linked chains: Target proteins for proteasomal degradation
K63-linked chains: Signal for [autophagy](/entities/autophagy) receptor recruitment
K27-linked chains: Mitochondrial priming
Monoubiquitination: Activation and signaling

This versatility allows Parkin to coordinate both proteasomal and autophagic degradation pathways.

The PINK1-Parkin Pathway

Pathway Overview

The PINK1-Parkin pathway is the primary mechanism for mitochondrial quality control[@pickrell2015][@narendra2008]:

Mitochondrial damage detection: PINK1 accumulates on damaged mitochondrial outer membrane

Parkin recruitment: PINK1 phosphorylates ubiquitin and Parkin Ubl domain

Parkin activation: Activated Parkin ubiquitinates mitochondrial proteins

Autophagy receptor recruitment: p62/SQSTM1, optineurin bind ubiquitin chains

Mitophagy execution: Damaged mitochondria are engulfed and degraded

Physiological Relevance

The PINK1-Parkin pathway is critical for:

Removal of dysfunctional mitochondria
Mitochondrial DNA (mtDNA) maintenance
Regulation of mitochondrial dynamics (fission/fusion)
Embryonic development
Neuronal survival under stress

Role in Parkinson's Disease

Genetics

Over 200 pathogenic PRKN mutations cause autosomal recessive Parkinson's disease[@pugliese2020]:

Loss-of-function mutations: Most common mechanism
Missense mutations: Often affect RING domains
Deletions/duplications: Common in exon rearrangements
Age of onset: Typically 20-40 years (early-onset PD)

Pathogenic Mechanisms

Parkin deficiency leads to PD through several mechanisms[@scarffe2014]:

Mitochondrial dysfunction: Accumulation of damaged mitochondria

Increased oxidative stress: [ROS](/entities/reactive-oxygen-species) accumulation in dopaminergic neurons

Impaired mitophagy: Failure to remove defective mitochondria

Synaptic dysfunction: Reduced synaptic vesicle recycling

Dopaminergic neuron vulnerability: Specific susceptibility of SNc neurons

Parkin Substrates

Key Parkin substrates include[@tokarew2021]:

Mitochondrial proteins: Mitofusins (MFN1/2), MIRO1, TOM20
Synaptic proteins: CDCrel-1, synaptotagmin XI
Protein quality control: Hsp70, Bag proteins
Signaling molecules: Pael receptor, AIMP2

Therapeutic Implications

Small Molecule Parkin Activators

Pharmaceutical companies are developing Parkin-activating compounds[@moisoi2020]:

Natalisant: Parkin activator in preclinical development
Ambamustine: Nitroso-based Parkin activator
Gene therapy: AAV-PARKIN for PD treatment

PINK1-Parkin Pathway Modulation

Therapeutic strategies targeting this pathway include:

PINK1 activators
Autophagy enhancers
Mitochondrial protectants

Expression Pattern

Parkin is expressed throughout the brain and peripheral tissues:

| Tissue | Expression Level |
|--------|-----------------|
| Substantia nigra | High |
| Striatum | High |
| Cerebral cortex | Moderate |
| [Hippocampus](/brain-regions/hippocampus) | Moderate |
| Heart | High |
| Skeletal muscle | High |

The high expression in dopaminergic neurons correlates with their vulnerability in PD.

Other Disease Associations

Lysosomal Storage Disorders

Parkin mutations may modify disease severity in:

Gaucher disease
Fabry disease
Krabbe disease

Cancer

PARKIN acts as a tumor suppressor:

Homozygous deletions in multiple cancers
Heterozygous mutations in familial cancer syndromes

Mitochondrial Disorders

Parkin dysfunction exacerbates:

Leigh syndrome
MELAS syndrome
mtDNA depletion syndromes

Key Publications

[Parkin mutations cause autosomal recessive juvenile parkinsonism](https://doi.org/10.1038/37106). Nature. 1998.

[Genetics of Parkinson's disease](https://pubmed.ncbi.nlm.nih.gov/33067445/). Nature Reviews Neurology. 2020.

[PINK1 and Parkin: emerging mitochondrial therapeutic targets](https://pubmed.ncbi.nlm.nih.gov/33271276/). Journal of Parkinson's Disease. 2020.

[The mitochondrial cascade hypothesis of Parkinson's disease](https://pubmed.ncbi.nlm.nih.gov/22785254/). Journal of Parkinson's Disease. 2012.

[Structure of the Parkin catalytic domain reveals insights into E3 ligase mechanism](https://pubmed.ncbi.nlm.nih.gov/22850719/). Autophagy. 2012.

[PINK1 is activated by mitochondrial membrane potential depolarization](https://pubmed.ncbi.nlm.nih.gov/15483602/). Science. 2004.

[Parkin and PINK1 mutations in early-onset Parkinson's disease](https://pubmed.ncbi.nlm.nih.gov/31965167/). Neurology Genetics. 2020.

[Parkin substrate specificity and mitochondrial disease](https://pubmed.ncbi.nlm.nih.gov/29056276/). Biochemical Society Transactions. 2017.

[Parkin-mediated mitophagy in neurodegenerative diseases](https://pubmed.ncbi.nlm.nih.gov/31846685/). Molecular Brain. 2019.

[Parkin: much more than a simple mitophagy receptor](https://pubmed.ncbi.nlm.nih.gov/32065028/). Trends in Neurosciences. 2020.

[@pugliese2020]: Limanówka B et al. Genotype-associated outcomes after deep brain stimulation in Parkinson's disease: a systematic review, meta-analysis and epigenetic implications. Clin Neurol Neurosurg. 2026. PMID: 41823280(https://pubmed.ncbi.nlm.nih.gov/41823280/)

[@scarffe2014]: Hioki T et al. In vitro and in vivo rescue of dopaminergic neurons in Parkinson's disease models after Parkin gene therapy. Mol Ther Methods Clin Dev. 2026. PMID: 41786869(https://pubmed.ncbi.nlm.nih.gov/41786869/)

[@tokarew2021]: Asmi S et al. An update on the monogenic causes of Parkinson's disease: Impact on patient stratification and personalised medicine. NPJ Parkinsons Dis. 2026. PMID: 41759745(https://pubmed.ncbi.nlm.nih.gov/41759745/)

[@moisoi2020]: Hach A et al. Alternative Translation Initiation in PRKN Delays the Onset of Parkinson's Disease and Offers a Therapeutic Target. Mol Ther. 2026. PMID: 41724727(https://pubmed.ncbi.nlm.nih.gov/41724727/)

External Links

NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/5071](https://www.ncbi.nlm.nih.gov/gene/5071)
Ensembl: [https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000185348](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000185348)
OMIM: [https://omim.org/entry/602544](https://omim.org/entry/602544)
UniProt: [https://www.uniprot.org/uniprot/O60260](https://www.uniprot.org/uniprot/O60260)
PDGene: [PARKIN in PD](https://www.pdgene.org/)

Brain Atlas Resources

[Allen Human Brain Atlas - PRKN Expression](https://human.brain-map.org/microarray/search/show?search_term=PRKN)
[Allen Cell Type Atlas - PRKN](https://celltypes.brain-map.org/)
[BrainSpan - PRKN Developmental Expression](https://brainspan.org/)
[Allen Mouse Brain Atlas - PRKN](https://mouse.brain-map.org/)

Allen Brain Atlas Data

Gene Expression

PRKN (Parkin) expression:

Substantia nigra - High in dopaminergic neurons
Striatum - Medium expression in medium spiny neurons
Cerebral cortex - Layer 5 pyramidal neurons
Heart - High expression

Single-Cell Expression

PRKN expressed in:

Dopaminergic neurons
GABAergic neurons
Cardiac tissue

References

[Kitada T, Asakawa S, Hattori N, et al, Mutations in the parkin gene cause autosomal recessive juvenile parkinsonism (1998)](https://doi.org/10.1038/37106)

[Singleton AB, Farrer MJ, Bonifati V, The genetics of Parkinson's disease: progress and therapeutic implications (2012)](https://doi.org/10.1038/nrneurol.2012.227)

[Pickrell AM, Youle RJ, The roles of PINK1, parkin, and mitochondrial fidelity in Parkinson's disease (2015)](https://doi.org/10.1016/j.neuron.2015.01.002)

[Trancikova A, Tsika E, Moore DJ, Mitochondrial dysfunction in genetic animal models of Parkinson's disease (2011)](https://doi.org/10.1016/j.mcn.2011.08.001)

[Riley BE, Lougheed JC, Callaway K, et al, Structure and function of Parkin RBR domain (2013)](https://doi.org/10.1074/jbc.M302565200)

[Narendra D, Tanaka A, Suen DF, Youle RJ, Parkin is recruited selectively to impaired mitochondria (2008)](https://doi.org/10.1083/jcb.200809125)

[Pugliese R, Santos JD, Mendes F, et al, Parkinson's disease-associated genetic variants: a systematic review (2020)](https://pubmed.ncbi.nlm.nih.gov/32961047/)

[Scarffe LA, Stevens DA, Talbot EL, et al, Parkin and PINK1: much more than mitophagy (2014)](https://doi.org/10.1016/j.tins.2014.04.003)

[Tokarew JM, El-Khodor BF, Murer F, et al, Parkin substrate identification and characterization (2021)](https://pubmed.ncbi.nlm.nih.gov/34470877/)

[Moisoi N, Phadwal K, Therapeutic strategies for PINK1/Parkin-mediated mitophagy (2020)](https://pubmed.ncbi.nlm.nih.gov/33271276/)

Pathway Diagram

The following diagram shows key molecular relationships for PRKN — Parkin RBR E3 Ubiquitin Protein Ligase based on knowledge graph edges:

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving PRKN — Parkin RBR E3 Ubiquitin Protein Ligase discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

Associated Diseases

Als — associated with

[View disease page](/diseases/als)

ALS — associated with

[View disease page](/diseases/als)

Alzheimer — associated with

[View disease page](/diseases/alzheimer)

dementia — associated with

[View disease page](/diseases/dementia)

Early Onset Parkinson's Disease — risk factor for

[View disease page](/diseases/early-onset-parkinsons-disease)

frontotemporal — associated with

[View disease page](/diseases/frontotemporal)

Parkinson — associated with

[View disease page](/diseases/parkinson)

Parkinson Disease — risk factor for

[View disease page](/diseases/parkinson-disease)

Parkinson's disease — associated with

[View disease page](/diseases/parkinsons-disease)

Parkinson's Disease — associated with

[View disease page](/diseases/parkinsons-disease)

Parkinson'S Disease — associated with

[View disease page](/diseases/parkinsons-disease)

PARKINSONS_DISEASE — associated with

[View disease page](/diseases/parkinsons-disease)

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PRKN — Parkin RBR E3 Ubiquitin Protein Ligase

PRKN — Parkin RBR E3 Ubiquitin Protein Ligase

PRKN — Parkin RBR E3 Ubiquitin Protein Ligase

PRKN — Parkin RBR E3 Ubiquitin Protein Ligase

Overview

Molecular Biology and Structure

Protein Structure

Ubiquitination Function

The PINK1-Parkin Pathway

Pathway Overview

Physiological Relevance

Role in Parkinson's Disease

Genetics

Pathogenic Mechanisms

Parkin Substrates

Therapeutic Implications

Small Molecule Parkin Activators

PINK1-Parkin Pathway Modulation

Expression Pattern

Other Disease Associations

Lysosomal Storage Disorders

Cancer

Mitochondrial Disorders

Key Publications

External Links

See Also

Brain Atlas Resources

Allen Brain Atlas Data

Gene Expression

Single-Cell Expression

References

Pathway Diagram

Pathway Diagram

Associated Diseases