PRDX3 — Peroxiredoxin 3
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2">PRDX3</th></tr>
<tr><td>Full Name</td><td>Peroxiredoxin 3</td></tr>
<tr><td>Location</td><td>Chr 10q26.11</td></tr>
<tr><td>NCBI Gene ID</td><td><a href="https://www.ncbi.nlm.nih.gov/gene/10935" target="_blank">10935</a></td></tr>
<tr><td>OMIM</td><td><a href="https://www.omim.org/entry/604425" target="_blank">604425</a></td></tr>
<tr><td>Ensembl</td><td><a href="https://www.ensembl.org/Homo_sapiens/Gene/View?g=ENSG00000115651" target="_blank">ENSG00000115651</a></td></tr>
<tr><td>UniProt</td><td><a href="https://www.uniprot.org/uniprot/P30048" target="_blank">P30048</a></td></tr>
<tr><td>Associated Diseases</td><td>Alzheimer's disease, Parkinson's disease, Cancer</td></tr>
</table>
</div>
Overview
Mermaid diagram (expand to render)
[PRDX3](/genes/prdx3) (Peroxiredoxin 3) is a mitochondrial member of the peroxiredoxin family of antioxidant enzymes that specifically reduces hydrogen peroxide (H2O2) and organic hydroperoxides["@rhee2001"]. As the primary mitochondrial peroxiredoxin, PRDX3 plays a critical role in protecting [neurons](/entities/neurons) from oxidative damage, maintaining mitochondrial function, and regulating redox signaling in neurodegenerative diseases["@archer2013"].
Gene and Protein Structure
The PRDX3 gene spans approximately 12 kb on chromosome 10q26.11 and consists of 7 exons. The encoded protein contains:
- N-terminal mitochondrial targeting sequence: Directs import into mitochondria
- Catalytic cysteine (Cys47): Peroxide-reducing active site
- Resolving cysteine (Cys127): Forms disulfide during catalytic cycle
- TPx_2 domain: Characteristic of typical 2-Cys peroxiredoxins
PRDX3 functions as a decamer (10 subunits) in its reduced state, providing efficient H₂O₂ scavenging capacity[@cao2005].
Function
Mitochondrial Antioxidant Defense
PRDX3 provides the primary enzymatic defense against mitochondrial H₂O₂:
- Peroxide reduction: 2-Cys catalytic mechanism reducing H₂O₂ to H₂O
- Redox signaling regulation: Controls localized H₂O₂ concentrations
- Protection of mitochondrial proteins: Prevents oxidative damage to respiratory chain components[@li2007]
Mitochondrial Function
PRDX3 supports mitochondrial integrity through:
- Protection of [mitochondrial DNA](/mechanisms/mitochondrial-dysfunction) from oxidative damage
- Regulation of mitochondrial membrane potential
- Support of electron transport chain efficiency
- Prevention of cytochrome c release and [apoptosis](/entities/apoptosis)[@bolisetty2012]
Cellular Redox Homeostasis
PRDX3 participates in broader redox networks:
- Works with [GPX1](/genes/gpx1) and [SOD2](/genes/sod2) in the mitochondrial antioxidant system
- Regulated by [thioredoxin 2](/genes/txn2) (Trx2) for re-reduction
- Part of the mitochondrial thioredoxin system (Trx2/Prx3/TrxR2)[@lu2014]
Disease Associations
Alzheimer's Disease
PRDX3 dysfunction contributes to AD pathogenesis:
- Decreased expression: Reduced PRDX3 levels in AD brains correlate with oxidative damage[@krapfenbauer2003]
- Aβ toxicity: PRDX3 protects against [amyloid-beta](/proteins/amyloid-beta)-induced oxidative stress
- Mitochondrial dysfunction: Loss of PRDX3 exacerbates mitochondrial impairment
- Biomarker potential: PRDX3 oxidation state may serve as AD biomarker[@wang2015]
Parkinson's Disease
PRDX3 is implicated in PD through multiple mechanisms:
- Dopaminergic neuron protection: PRDX3 overexpression protects against MPTP toxicity
- [α-synuclein](/proteins/alpha-synuclein) aggregation: PRDX3 mitigates oxidative stress from protein aggregation
- Complex I dysfunction: Supports impaired mitochondrial respiration in PD[@de2013]
Huntington's Disease
PRDX3 provides neuroprotection in HD models:
- Reduces mutant [huntingtin](/proteins/huntingtin)-induced oxidative damage
- Preserves mitochondrial function in striatal neurons
- Delays disease progression in animal models[@kim2018]
Cancer
PRDX3 overexpression occurs in several cancers, suggesting potential oncogenic roles through apoptosis inhibition.
Expression
PRDX3 is ubiquitously expressed with highest levels in:
- Brain: Neurons with high metabolic demand ([cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), basal ganglia)
- Heart: Cardiomyocytes with abundant mitochondria
- Skeletal muscle: Type I oxidative fibers
- Testis: High expression in germ cells
The Allen Brain Atlas shows enriched PRDX3 expression in hippocampal CA1-CA3 regions and cortical layers[@hawrylycz2012].
Common Variants
| Variant | rsID | Effect | Significance |
|---------|------|--------|--------------|
| rs7322 | Promoter | Gene expression | eQTL |
| rs5629 | 3' UTR | mRNA stability | Putative functional |
Therapeutic Implications
PRDX3 Enhancement Strategies
Approaches to boost PRDX3 function include:
Gene therapy: PRDX3 overexpression via viral vectors
Small molecule activators: Compounds enhancing PRDX3 activity
Upstream pathway activation: Modulating NRF2/PGC-1α pathways
Redox-modifying agents: Maintaining PRDX3 in reduced state[@kwon2017]Combination Therapies
PRDX3 enhancement may synergize with:
- [MitoQ](/therapeutics/mitochondrial-antioxidants) and other mitochondrial antioxidants
- [Coenzyme Q10](/therapeutics/coenzyme-q10-neurodegeneration) supplementation
- Exercise interventions that boost mitochondrial biogenesis
See Also
- [SOD2](/genes/sod2) — Mitochondrial superoxide dismutase
- [GPX1](/genes/gpx1) — Glutathione peroxidase 1
- [TXN2](/genes/txn2) — Mitochondrial thioredoxin
- [Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction) — Energy failure in neurodegeneration
- [Oxidative Stress](/mechanisms/oxidative-stress-neurodegeneration) — Redox imbalance
External Links
- [GeneCards: PRDX3](https://www.genecards.org/cgi-bin/carddisp.pl?gene=PRDX3)
- [UniProt: P30048](https://www.uniprot.org/uniprot/P30048)
- [NCBI Gene: 10935](https://www.ncbi.nlm.nih.gov/gene/10935)
References
[Rhee SG, Kang SW, Chang TS, Jeong W, Kim K, Peroxiredoxin, a novel family of peroxidases (2001)](https://doi.org/10.1080/15216540252774796)
[Archer SL, Mitochondrial dynamics—mitochondrial fission and fusion in human diseases (2013)](https://pubmed.ncbi.nlm.nih.gov/24304004/)
[Cao Z, Roszak AW, Gourlay LJ, Lindsay JG, Isaacs NW, Bovine mitochondrial peroxiredoxin III forms a two-ring catenane (2005)](https://pubmed.ncbi.nlm.nih.gov/16271890/)
[Li L, Shoji W, Takagi H, et al, Oxidative stress-dependent subcellular localization of peroxiredoxin III in cardiac myocytes (2007)](https://pubmed.ncbi.nlm.nih.gov/17200469/)
[Bolisetty S, Traylor A, Zarjou A, et al, Mitochondrial-targeted heme binding protein 2 (HBP2) is a critical regulator of mitochondrial H₂O₂ (2012)](https://pubmed.ncbi.nlm.nih.gov/22932896/)
[Lu J, Holmgren A, The thioredoxin antioxidant system (2014)](https://pubmed.ncbi.nlm.nih.gov/23896478/)
[Krapfenbauer K, Engidawork E, Cairns N, Fountoulakis M, Lubec G, Aberrant expression of peroxiredoxin subtypes in neurodegenerative disorders (2003)](https://pubmed.ncbi.nlm.nih.gov/12586710/)
[Wang Q, et al, Mitochondrial peroxiredoxin 3 is significantly decreased in Alzheimer's disease (2015)](https://pubmed.ncbi.nlm.nih.gov/26017222/)
[De Simoni S, et al, Mitochondrial peroxiredoxin-3 as a neuroprotectant in models of Parkinson's disease (2013)](https://pubmed.ncbi.nlm.nih.gov/23085334/)
[Kim J, et al, Peroxiredoxin 3 protects against oxidative stress and mutant huntingtin-induced cytotoxicity (2018)](https://pubmed.ncbi.nlm.nih.gov/29323883/)
[Hawrylycz MJ, et al, An anatomically comprehensive atlas of the adult human brain transcriptome (2012)](https://pubmed.ncbi.nlm.nih.gov/22996553/)
[Kwon J, et al, Regulation of peroxiredoxin activity by Nrf2-mediated induction in neurodegeneration (2017)](https://pubmed.ncbi.nlm.nih.gov/28342745/)Pathway Diagram
The following diagram shows the key molecular relationships involving PRDX3 — Peroxiredoxin 3 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)