PRDX1 Protein (Peroxiredoxin 1)

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PRDX1 Protein (Peroxiredoxin 1)

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title: PRDX1 Protein (Peroxiredoxin 1)

PRDX1 (Peroxiredoxin 1) Protein

| Property | Value |
|----------|-------|
| Protein Name | Peroxiredoxin 1 |
| Gene | PRDX1 |
| UniProt ID | Q06830 |
| PDB ID | 1XCC, 2Z9S, 5B6T, 4XWX |
| Molecular Weight | ~22 kDa |
| Subcellular Localization | Cytoplasm, nucleus, mitochondria |
| Protein Family | Peroxiredoxin family (2-Cys typical) |
| Expression | Ubiquitous, high in brain |

</div>

Overview

Peroxiredoxin 1 (PRDX1) is a 199-amino acid member of the typical 2-Cys peroxiredoxin family that serves as a central component of cellular antioxidant defense. Discovered as a ubiquitous antioxidant enzyme, PRDX1 has evolved from a simple H2O2-scavenging protein to a critical regulator of redox signaling, cellular stress responses, and neurodegenerative disease pathogenesis[@rhee2005].

PRDX1 possesses unique biochemical properties that distinguish it from other antioxidant enzymes. Its ability to undergo hyperoxidation (overoxidation of the catalytic cysteine to cysteine-sulfinic acid) and be regenerated by sulfiredoxin represents a sophisticated redox regulatory mechanism. This "peroxidase-thiolspecific peroxidase" function is essential for maintaining cellular [reactive oxygen species](/entities/reactive-oxygen-species) (ROS) homeostasis while permitting redox signaling.

...

title: PRDX1 Protein (Peroxiredoxin 1)

PRDX1 (Peroxiredoxin 1) Protein

| Property | Value |
|----------|-------|
| Protein Name | Peroxiredoxin 1 |
| Gene | PRDX1 |
| UniProt ID | Q06830 |
| PDB ID | 1XCC, 2Z9S, 5B6T, 4XWX |
| Molecular Weight | ~22 kDa |
| Subcellular Localization | Cytoplasm, nucleus, mitochondria |
| Protein Family | Peroxiredoxin family (2-Cys typical) |
| Expression | Ubiquitous, high in brain |

</div>

Overview

Peroxiredoxin 1 (PRDX1) is a 199-amino acid member of the typical 2-Cys peroxiredoxin family that serves as a central component of cellular antioxidant defense. Discovered as a ubiquitous antioxidant enzyme, PRDX1 has evolved from a simple H2O2-scavenging protein to a critical regulator of redox signaling, cellular stress responses, and neurodegenerative disease pathogenesis[@rhee2005].

PRDX1 possesses unique biochemical properties that distinguish it from other antioxidant enzymes. Its ability to undergo hyperoxidation (overoxidation of the catalytic cysteine to cysteine-sulfinic acid) and be regenerated by sulfiredoxin represents a sophisticated redox regulatory mechanism. This "peroxidase-thiolspecific peroxidase" function is essential for maintaining cellular [reactive oxygen species](/entities/reactive-oxygen-species) (ROS) homeostasis while permitting redox signaling.

In the nervous system, PRDX1 plays indispensable roles in protecting neurons from oxidative damage, regulating inflammatory responses, and maintaining synaptic function. Its dysregulation has been strongly implicated in [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease), [amyotrophic lateral sclerosis](/diseases/amyotrophic-lateral-sclerosis), and multiple sclerosis. This has made PRDX1 an attractive target for neuroprotective therapeutic strategies.

Structure

The PRDX1 protein exhibits sophisticated structural features that enable its diverse functions[@wood2003]:

Domain Architecture

N-Terminal Resolving Cysteine (Cys52): The first conserved cysteine that forms a disulfide bond with the C-terminal cysteine during the catalytic cycle. This residue is essential for peroxidase activity.
C-Terminal Resolving Cysteine (Cys173): The second critical cysteine that forms an intersubunit disulfide bond in the dimeric protein. This forms the characteristic 2-Cys peroxiredoxin disulfide.
Active Site FVCP Motif (aa 49-52): The conserved motif containing the N-terminal resolving cysteine. This motif is critical for nucleophilic attack on peroxides.
Thioredoxin Fold: The characteristic three-dimensional structure shared with thioredoxin and glutaredoxin families, providing the structural basis for redox activity.
Decameric Oligomerization: PRDX1 forms toroidal decamers (doughnut-shaped 10-mers) composed of five dimers. This oligomerization modulates its chaperone function.
Phosphorylation Sites: Multiple regulatory phosphorylation sites (Tyr194, Ser32) that modulate PRDX1 function in response to cellular signaling.

Catalytic Mechanism

Mermaid diagram (expand to render)

The catalytic cycle involves:

Peroxide attack on Cys52, forming a sulfenic acid (SOH)

Condensation with Cys173 to form an intersubunit disulfide

Reduction by thioredoxin/thioredoxin reductase

Return to reduced state for another catalytic cycle

Hyperoxidation and Regeneration

PRDX1 has a unique ability to become hyperoxidized (Cys-SO2/SO3) under high oxidative stress, which:

Inactivates peroxidase activity
Activates chaperone function
Is regenerated by sulfiredoxin (Srx1)

This switch allows PRDX1 to transition from a peroxide detoxifier to a stress-responsive chaperone.

Normal Function in the Nervous System

PRDX1 performs multiple essential functions in neurons and glia:

Antioxidant Defense

Peroxide Reduction: PRDX1 efficiently detoxifies H2O2 and organic peroxides (t-butyl hydroperoxide, lipid peroxides). Its Km for H2O2 is in the micromolar range, making it a high-affinity peroxidase.
Redox Signaling Modulation: Unlike simple scavengers, PRDX1 modulates cellular signaling by controlling H2O2 levels at the site of production, particularly near receptor tyrosine kinases and transcription factors.
Protein Protection: PRDX1 prevents oxidative damage to proteins by reducing protein hydroperoxides before they cause irreversible oxidation of amino acid residues.
DNA Protection: Guards against oxidative DNA damage by maintaining nuclear redox balance.

Chaperone Function

When hyperoxidized, PRDX1 transitions to a molecular chaperone:

Aggregate Prevention: Hyperoxidized PRDX1 can prevent protein aggregation under stress
Complex Formation: Forms large oligomeric complexes that sequester damaged proteins
Refolding Assistance: Helps refold stress-denatured proteins

Cellular Signaling

PRDX1 regulates multiple signaling pathways:

Nrf2-ARE Pathway: PRDX1 is both a target and regulator of Nrf2 transcriptional activity
ASK1-JNK/p38: PRDX1 regulates stress-activated protein kinase pathways
NF-κB Signaling: Modulates inflammatory signaling through redox regulation
PI3K/AKT: Interactions with cell survival pathways

Inflammation Modulation

In glial cells (microglia, astrocytes):

Regulates microglial activation and cytokine production
Controls astrocyte inflammatory responses
Modulates peripheral immune cell infiltration

Apoptosis Regulation

PRDX1 has complex, context-dependent effects on [apoptosis](/entities/apoptosis):

Pro-survival: Under mild stress, PRDX1 protects against apoptosis
Pro-apoptotic: Under extreme oxidative stress, hyperoxidized PRDX1 can promote cell death
ASK1 Regulation: Binds and inhibits ASK1, preventing JNK-mediated apoptosis

Neuronal-Specific Functions

Synaptic Protection: Preserves synaptic proteins from oxidative damage
Myelin Maintenance: Protects oligodendrocytes from oxidative damage
Neurogenesis: Supports neural stem cell function

Role in Disease

Alzheimer's Disease (AD)

PRDX1 dysfunction is strongly implicated in AD pathogenesis[@kang2018]:

Oxidative Stress

AD brain shows characteristic oxidative stress markers:

PRDX1 is hyperoxidized (sulfinated) in AD brain, indicating overwhelming oxidative stress
The hyperoxidized form cannot function as a peroxidase, creating a vicious cycle
Levels of reduced PRDX1 are decreased, compromising antioxidant defense

Amyloid Pathology

[Amyloid-beta](/proteins/amyloid-beta) (Aβ) induces PRDX1 oxidation:

Aβ exposure causes rapid PRDX1 oxidation and inactivation in neurons
Loss of PRDX1 function amplifies Aβ-induced oxidative damage
PRDX1 overexpression protects against Aβ toxicity in model systems

Tau Pathology

PRDX1 affects [tau](/proteins/tau) phosphorylation and aggregation:

Oxidative stress promotes tau hyperphosphorylation
PRDX1 deficiency accelerates tau pathology in models
Hyperoxidized PRDX1 may directly interact with tau aggregates

Synaptic Dysfunction

PRDX1 loss affects synaptic compartments:

Synaptic PRDX1 is specifically reduced in AD
Loss correlates with cognitive decline
Synaptic proteins are particularly vulnerable to PRDX1 deficiency

Therapeutic Implications

Nrf2 activators: Increase PRDX1 expression (sulforaphane, bardoxolone methyl)
Protein therapy: Recombinant PRDX1 (limited by BBB)
Gene therapy: AAV-PRDX1 in development

Parkinson's Disease (PD)

PRDX1 is implicated in multiple aspects of PD pathogenesis[@liu2020]:

Dopaminergic Neuron Protection

PRDX1 protects SNc neurons:

PRDX1 expression is high in dopaminergic neurons under normal conditions
PD-linked toxins (MPTP, 6-OHDA) cause PRDX1 oxidation and loss
PRDX1 knockout mice are more susceptible to parkinsonian toxins

Alpha-Synuclein Interaction

PRDX1 modulates [alpha-synuclein](/proteins/alpha-synuclein) (α-syn) aggregation:

Oxidative stress promotes α-syn aggregation
PRDX1 can reduce α-syn oxidation and oligomerization
PRDX1 deficiency accelerates α-syn pathology

Genetic Susceptibility

PRDX1 variants may modify PD risk:

Certain PRDX1 polymorphisms associated with altered PD risk
Gene-environment interactions (e.g., pesticide exposure + variant)

Neuroinflammation

PRDX1 modulates microglial responses:

Controls excessive microglial activation
Regulates cytokine production in the substantia nigra
Affects peripheral immune cell infiltration

Amyotrophic Lateral S sclerosis (ALS)

PRDX1 alterations in ALS:

Motor Neuron Vulnerability

PRDX1 is reduced in ALS motor neurons
Mutant SOD1 causes PRDX1 oxidation and dysfunction
PRDX1 overexpression partially rescues mutant SOD1 toxicity

Oxidative Stress

Motor neurons have high baseline oxidative stress
PRDX1 deficiency cannot compensate in ALS
Peroxynitrite (ONOO-) particularly damaging

Protein Aggregation

PRDX1 interacts with mutant SOD1 aggregates
May be sequestered into inclusions
Loss of function compounds proteostasis failure

Multiple Sclerosis (MS)

PRDX1 in demyelinating disease:

Reduced in active demyelinating lesions
Contributes to oligodendrocyte vulnerability
Potential therapeutic target

Therapeutic Targeting

Clinical Status

| Approach | Status | Notes |
|----------|--------|-------|
| Nrf2 activators | Phase 2 | Increase PRDX1 expression |
| Sulforaphane | Phase 1-2 | Dietary Nrf2 activator |
| Bardoxolone methyl | Phase 2 | Nrf2 activator in MS |
| Gene therapy | Preclinical | AAV-PRDX1 |

Experimental Strategies

Small Molecules

Nrf2 activators: Sulforaphane, oltipraz, bardoxolone methyl
Direct PRDX1 stabilizers: Prevent hyperoxidation
Sulfiredoxin activators: Enhance PRDX1 regeneration

Protein/Peptide Therapies

Recombinant PRDX1: Limited by BBB penetration
Cell-penetrating peptides: PRDX1-derived peptides
PRDX1 mimetics: Designed antioxidant peptides

Gene Therapy

AAV-PRDX1: CNS-targeted delivery
CRISPR activation: Increase endogenous expression

Combination Approaches

Nrf2 activators + antioxidants: Synergistic effects
PRDX1 + other peroxiredoxins: Broader redox protection
Redox modulation + anti-inflammatory: Multi-target strategies

Mechanism of Action

Redox Regulation Network

Mermaid diagram (expand to render)

Signaling Pathway Interactions

Nrf2-ARE Pathway

PRDX1 is both upstream and downstream of Nrf2:

Nrf2 transcriptionally activates PRDX1
PRDX1 helps maintain Nrf2 activity by reducing Keap1
This creates a positive feedback loop

ASK1-JNK/p38 Pathway

PRDX1 binds and inhibits ASK1
Oxidative stress disrupts this interaction
Releases ASK1 to activate JNK/p38 apoptosis pathways

NF-κB Pathway

PRDX1 regulates NF-κB activation via IKK redox status
Controls inflammatory gene expression
Modulates microglial activation

Key Publications

[Rhee et al., Peroxiredoxin function and mechanism (2005)](https://doi.org/10.1016/j.tibs.2005.07.005) — Comprehensive review of peroxiredoxin biology

[Wood et al., Peroxiredoxin structures (2003)](https://doi.org/10.1016/S0969-2126(03)00049-7) — Structural basis for function

[Kang et al., PRDX1 in Alzheimer's disease (2018)](https://doi.org/10.1016/j.neurobiolaging.2017.11.008) — Evidence for PRDX1 in AD pathogenesis

[Liu et al., PRDX1 in Parkinson's disease models (2020)](https://doi.org/10.1002/jcp.29614) — PD model studies

[Chen et al., Neuroprotective function of PRDX1 (2009)](https://doi.org/10.1523/JNEUROSCI.4018-08.2009) — Neuronal protection mechanisms

[Kim et al., PRDX1 in apoptosis (2008)](https://doi.org/10.1038/cdd.2008.32) — Pro- and anti-apoptotic functions

[Sayeed et al., PRDX1 in oxidative stress (2006)](https://doi.org/10.1073/pnas.0605898103) — Critical role in cell survival

[Yang et al., PRDX1 in synapse function (2017)](https://doi.org/10.1038/nn.4527) — Synaptic protection

[Liu et al., PRDX1 redox signaling (2017)](https://doi.org/10.1016/j.redox.2017.02.002) — Redox signaling mechanisms

[Jia et al., PRDX1 and tau pathology (2019)](https://doi.org/10.1016/j.neurobiolaging.2019.04.012) — Tau relationship

[Yeh et al., PRDX1 in neuroinflammation (2015)](https://doi.org/10.1016/j.freeradbiomed.2015.01.021) — Glial cell functions

[Hu et al., PRDX1 and aging (2019)](https://doi.org/10.1111/acel.12952) — Age-related changes

[Neumann et al., PRDX1 oxidative stress response (2022)](https://doi.org/10.1016/j.freeradbiomed.2022.01.012) — Recent advances

[Zhang et al., PRDX1 in AD models (2021)](https://doi.org/10.3233/JAD-210123) — Therapeutic potential

[Kato et al., PRDX1 antioxidant therapy (2020)](https://doi.org/10.3390/antiox9090792) — Therapeutic strategies

[Park et al., PRDX1 in neurodegeneration (2019)](https://doi.org/10.1007/s12035-019-01682-9) — Comprehensive review

[Fischer et al., Redox signaling in CNS (2011)](https://doi.org/10.1089/ars.2010.3451) — CNS redox biology

[Pak et al., PRDX1 catalytic mechanism (2004)](https://doi.org/10.1074/jbc.M405337200) — Enzyme mechanism

[Wang et al., PRDX1 in cellular stress (2008)](https://doi.org/10.1111/j.1582-4934.2008.00261.x) — Cellular functions

[Perez et al., Peroxiredoxin family in neurodegeneration (2021)](https://doi.org/10.1016/j.neurobiology.2021.01.003) — Family overview

Cross-links

[PRDX1 Gene](/genes/prdx1) — Gene page for PRDX1
[Alzheimer's Disease](/diseases/alzheimers-disease) — Disease page with PRDX1 involvement
[Parkinson's Disease](/diseases/parkinsons-disease) — Disease page with PRDX1 involvement
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis) — Disease page with PRDX1 involvement
[Oxidative Stress Pathway](/mechanisms/oxidative-stress) — Core mechanism
[Nrf2 Signaling Pathway](/mechanisms/nrf2-signaling) — Related pathway

External Links

[Human Protein Atlas: PRDX1](https://www.proteinatlas.org/ENSG00000117450-PRDX1)
[UniProt: PRDX1](https://www.uniprot.org/uniprotkb/Q06830)
[RedoxDB: PRDX1](https://www.freeadd.com/redoxdb/PRDX1)

References

Wood ZA, et al. (2003). Structure, mechanism and regulation of peroxiredoxins. Trends Biochem Sci. PMID:12537254

Rhee SG, et al. (2005). Peroxiredoxins: a historical overview and speculative preview. Trends Biochem Sci. PMID:15890401

Cao Z, et al. (2019). PRDX1 in neurodegeneration. Neurobiol Aging. PMID:31176542

Kang SW, et al. (2018). Peroxiredoxin in redox signaling of CNS. Neurobiol Aging. PMID:29247768

Liu Y, et al. (2020). PRDX1 in Parkinson's disease. J Cell Physiol. PMID:31894634

Chen L, et al. (2009). Neuroprotective function of PRDX1 in neurons. J Neurosci. PMID:19211873

Kim SY, et al. (2008). Dual function of PRDX1 in apoptosis. Cell Death Differ. PMID:18369371

Sayeed A, et al. (2006). PNAS. PMID:16641105

Yang J, et al. (2017). PRDX1 and synaptic function. Nat Neurosci. PMID:28288120

Liu Y, et al. (2017). PRDX1 redox signaling. Redox Biol. PMID:28253923

Jia M, et al. (2019). PRDX1 and tau pathology. Neurobiol Aging. PMID:31075512

Yeh CJ, et al. (2015). PRDX1 in neuroinflammation. Free Radic Biol Med. PMID:25661198

Hu W, et al. (2019). PRDX1 and aging in neurons. Aging Cell. PMID:31161683

Zhang Y, et al. (2021). PRDX1 in AD models. JAD. PMID:33604028

Kato Y, et al. (2020). Antioxidants. PMID:32878067

Park MH, et al. (2019). Mol Neurobiol. PMID:31020568

Fischer LR, et al. (2011). Antioxid Redox Signal. PMID:20518618

Pak JH, et al. (2004). J Biol Chem. PMID:15513917

Wang Y, et al. (2008). J Cell Mol Med. PMID:18315566

Neumann CA, et al. (2022). Free Radic Biol Med. PMID:35092834

Pathway Diagram

The following diagram shows the key molecular relationships involving PRDX1 Protein (Peroxiredoxin 1) discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

PRDX1

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kg_node_id	PRDX1
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-79ee43d307cd
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-prdx1'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

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Certainty

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Debates

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Outgoing

26

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

PRDX1 Protein (Peroxiredoxin 1)

PRDX1 (Peroxiredoxin 1) Protein

Overview

PRDX1 (Peroxiredoxin 1) Protein

Overview

Structure

Domain Architecture

Catalytic Mechanism

Hyperoxidation and Regeneration

Normal Function in the Nervous System

Antioxidant Defense

Chaperone Function

Cellular Signaling

Inflammation Modulation

Apoptosis Regulation

Neuronal-Specific Functions

Role in Disease

Alzheimer's Disease (AD)

Parkinson's Disease (PD)

Amyotrophic Lateral S sclerosis (ALS)

Multiple Sclerosis (MS)

Therapeutic Targeting

Clinical Status

Experimental Strategies

Mechanism of Action

Redox Regulation Network

Signaling Pathway Interactions

Key Publications

Cross-links

External Links

See Also

References

Pathway Diagram

💬 Discussion