NFE2L3 Protein

NFE2L3 Protein — Nuclear Factor Erythroid 2-Like 3 Protein

Overview

NFE2L3 Protein — Nuclear Factor Erythroid 2-Like 3 Protein

Overview

NFE2L3 (Nuclear Factor Erythroid 2-Like 3), also known as Nrf3, is a transcription factor belonging to the Cap'n'collar (CNC) family of basic leucine zipper proteins. While historically less studied than its well-known paralog [NFE2L2](/genes/nfe2l2) (Nrf2), emerging research suggests NFE2L3 plays important roles in cellular stress responses, oxidative stress defense, and may have relevance to neurodegenerative disease pathogenesis. The NFE2L3 gene encodes a protein that heterodimerizes with small Maf proteins to regulate antioxidant response element (ARE)-driven gene expression["@zhang2023"].

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">Nuclear Factor Erythroid 2-Like 3 Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>Nuclear Factor Erythroid 2-Like 3 Protein</td></tr>
<tr><td><strong>Gene Symbol</strong></td><td>[NFE2L3](/genes/nfe2l3)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9Y5U8](https://www.uniprot.org/uniprot/Q9Y5U8)</td></tr>
<tr><td><strong>Alternative Names</strong></td><td>Nrf3, NFE2L3</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~65-90 kDa</td></tr>
<tr><td><strong>Subcellular Location</strong></td><td>Nucleus (ER-anchored precursor)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>CNC (Cap'n'collar) bZIP family</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Introduction

The CNC family of transcription factors, which includes [NFE2L1](/genes/nfe2l1), [NFE2L2](/genes/nfe2l2), and NFE2L3, regulates cellular defense mechanisms against oxidative and electrophilic stress. NFE2L3 was initially characterized as a placental-specific factor but subsequent studies revealed broader expression patterns, including in the brain[@kobayashi2019]. Unlike [NFE2L2](/genes/nfe2l2), which is the master regulator of the antioxidant response and has extensively studied roles in [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease), NFE2L3's functions in neurodegeneration remain an emerging area of research.

Structure

Domain Architecture

NFE2L3 protein contains several conserved domains characteristic of the CNC family:

• N-terminal Neh2-like domain: Contains regulatory elements that control protein stability and subcellular localization
• Basic leucine zipper (bZIP) domain: Mediates DNA binding and heterodimerization with small Maf proteins ([MAFF](/proteins/maff-protein), [MAFG](/proteins/mafg-protein), [MAFK](/proteins/mafk-protein))
• Neh6-like domain: Involved in protein-protein interactions and transcriptional activation
• C-terminal transcriptional activation domain: Facilitates recruitment of transcriptional co-activators

Post-Translational Modifications

NFE2L3 undergoes several post-translational modifications that regulate its activity:

• Proteolytic processing: The N-terminal transmembrane domain is cleaved to release the active transcription factor
• Ubiquitination: Regulates protein stability and turnover
• Phosphorylation: Affects nuclear localization and transcriptional activity

Function

Transcriptional Regulation

NFE2L3 functions as a transcriptional activator by forming heterodimers with small Maf proteins. These complexes bind to Antioxidant Response Elements (ARE sequences, 5'-TGACnnnGC-3') in the promoter regions of target genes[@sykiotis2010]. Key target genes include:

• Antioxidant enzymes: [NQO1](/proteins/nqo1-protein), [HO-1](/genes/hmox1) (heme oxygenase-1), [GCLC](/genes/gclc)
• Phase II detoxification enzymes: [GSTA1](/genes/gsta1), [GSTM1](/genes/gstm1)
• Stress response proteins: [DNAJA1](/genes/dnaja1), [HSP70](/genes/hspa1a) family members

Cellular Roles

Expression Pattern

Brain Expression

NFE2L3 is expressed in various brain regions, including:

• Cerebral [cortex](/brain-regions/cortex)
• [Hippocampus](/brain-regions/hippocampus) (particularly CA1 and dentate gyrus)
• Cerebellum
• Substantia nigra

Regulation of Expression

NFE2L3 expression is regulated by:

• Transcriptional control: Via ARE sequences in its own promoter (auto-regulation)
• Cellular stress: Oxidative stress, proteasome inhibition, and ER stress can upregulate expression
• Developmental cues: Higher expression during embryonic development

Interactions

Protein-Protein Interactions

| Partner Protein | Interaction Type | Functional Significance |
|-----------------|-----------------|----------------------|
| MAFF | Heterodimer | DNA binding to ARE sequences |
| MAFG | Heterodimer | DNA binding, transcriptional activation |
| MAFK | Heterodimer | Transcriptional repression/dimerization |
| KEAP1 | Potential interaction | Potential redox regulation (similar to Nrf2) |
| CBP/p300 | Co-activator recruitment | Transcriptional activation |

Pathway Participation

NFE2L3 participates in several cellular signaling pathways:

• Nrf2-ARE pathway: Functions in parallel with [NFE2L2](/genes/nfe2l2) to regulate antioxidant genes
• Proteasome-ATF4 axis: Regulated by proteasome activity
• ER stress response: Connected to [unfolded protein response](/entities/unfolded-protein-response) pathways

Disease Relevance

Neurodegenerative Diseases

While research on NFE2L3 in neurodegeneration is less extensive than for [NFE2L2](/genes/nfe2l2), several connections have been identified:

Alzheimer's Disease

• Oxidative stress is a hallmark feature of [Alzheimer's disease](/diseases/alzheimers-disease) pathogenesis
• NFE2L3 may contribute to antioxidant defense in [tau](/proteins/tau)-exposed neurons
• [Amyloid-beta](/proteins/amyloid-beta) peptide exposure can induce NFE2L3 expression in cellular models
• Potential protective role against amyloid-beta-induced neurotoxicity[@jadeja2019]

Parkinson's Disease

• [Parkinson's disease](/diseases/parkinsons-disease) involves mitochondrial dysfunction and oxidative stress
• NFE2L3 expression is detected in the substantia nigra
• May provide neuroprotection against dopaminergic neuron loss
• Interaction with [PINK1](/genes/pink1)/[PARKIN](/genes/park2) mitophagy pathway is under investigation

Amyotrophic Lateral Sclerosis (ALS)

• Oxidative stress and protein aggregation are key features of [ALS](/diseases/als)
• NFE2L3 may be involved in regulating antioxidant responses in motor neurons
• Altered expression patterns observed in some ALS models

Other Neurodegenerative Conditions

• Huntington's disease: Potential role in regulating oxidative stress responses
• Frontotemporal dementia: Emerging research on CNC family factors
• Multiple sclerosis: Possible functions in glial cell responses

Cancer Relevance

NFE2L3 has been more extensively studied in cancer biology, where it can function as both tumor suppressor and oncogenic factor depending on context. This dual role highlights the complexity of NFE2L3 signaling.

Therapeutic Implications

Targeting NFE2L3 in Neurodegeneration

While no NFE2L3-specific therapeutics exist yet, several strategies are being explored:

Challenges

• Specific pharmacological activators for NFE2L3 are limited
• Tissue-specific delivery to the brain remains challenging
• Need for better understanding of NFE2L3-specific versus NFE2L2-overlapping functions

Research Tools

Model Systems

• Knockout mice: Nfe2l3-deficient mice are viable but show altered stress responses
• Cell lines: Various neuronal and glial cell lines for in vitro studies
• iPSC-derived neurons: Human neurons for disease modeling

Experimental Techniques

• Chromatin immunoprecipitation (ChIP) for target gene identification
• Reporter assays for ARE-driven transcription
• Proteomics to identify protein interaction networks

Summary

NFE2L3 (Nrf3) is an emerging player in cellular stress responses with growing relevance to neurodegenerative diseases. While less characterized than [NFE2L2](/genes/nfe2l2), NFE2L3 contributes to antioxidant defense, protein homeostasis, and cellular protection mechanisms in the brain. Future research will clarify its specific roles in [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease), and other neurodegenerative conditions, potentially revealing new therapeutic targets for enhancing neuroprotection.

See Also

• [NFE2L2 Gene](/genes/nfe2l2)
• [Alzheimer's disease](/diseases/alzheimers-disease)
• [Parkinson's disease](/diseases/parkinsons-disease)
• [ALS](/diseases/als)

External Links

• [GeneCards: NFE2L2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=NFE2L2)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving NFE2L3 Protein discovered through SciDEX knowledge graph analysis: