ENO1 Gene

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ENO1 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">eno1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>ENO1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Enolase 1 (Alpha-enolase)</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>1p36.23</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>2023</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>172430</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000169064</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P06733</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/breast-cancer" style="color:#ef9a9a">Breast Cancer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">116 edges</a></td>
</tr>
</table>

Introduction

...

ENO1 Gene

Introduction

ENO1 (Enolase 1) encodes alpha-enolase, a key glycolytic enzyme also known as phosphopyruvate hydratase. Beyond its well-established role in glycolysis, alpha-enolase has emerged as a multifunctional protein with critical roles in neurodegeneration. It functions as a glycolytic enzyme, stress protein, plasminogen receptor, and autoantigen. The gene is located on chromosome 1p36.23 and encodes a 433-amino acid protein (approximately 47 kDa). ENO1 is ubiquitously expressed but exhibits particularly high levels in neurons and other tissues with high metabolic demand.

Gene Information

Protein Structure

Alpha-enolase is a 433-amino acid protein (approximately 47 kDa) that forms homodimers and heterodimers with other enolase isoforms (ENO2, ENO3). The enzyme requires magnesium ions for catalytic activity.

Structural Domains

N-terminal domain (aa 1-150): Involved in dimerization and protein-protein interactions with various binding partners
Central domain (aa 151-350): Contains the enolase active site responsible for catalyzing the conversion of 2-phosphoglycerate to phosphoenolpyruvate
C-terminal domain (aa 351-433): Contains a lysine-rich region that can function as a DNA-binding site and mediates interactions with plasminogen

Alternative Splicing

ENO1 produces multiple isoforms through alternative splicing:

α-Enolase: The predominant isoform in most tissues
MiRNA-1: A smaller isoform generated from an internal promoter, localized to the cell surface

Normal Function

Glycolysis

Alpha-enolase catalyzes the conversion of 2-phosphoglycerate to phosphoenolpyruvate (PEP), the second-to-last step of glycolysis:

2-Phosphoglycerate + Mg²⁺ → Phosphoenolpyruvate + H₂O + Mg²⁺

This reaction is critical for cellular energy production, particularly in neurons which have high metabolic demands (Song et al., 2009).

Additional Functions

Plasminogen binding: Surface enolase serves as a receptor for plasminogen, linking metabolism to fibrinolysis
Stress protein: Induced under various stress conditions including hypoxia, oxidative stress, and inflammatory stimuli (Mariga et al., 2012)
c-Myc binding protein: Functions as a transcriptional repressor influencing gene expression
Autoantigen: Can trigger autoimmune responses in certain disease contexts

Role in Neurodegeneration

Alzheimer's Disease

Alpha-enolase has been extensively studied in Alzheimer's disease (AD):

Autoimmune Aspects:

Anti-ENO1 antibodies have been detected in AD patients' cerebrospinal fluid and serum (Chen et al., 2006)
These autoantibodies may contribute to disease progression through immune complex formation
ENO1 is recognized as one of the autoantigens in the "Alzheimer's disease-associated immune repertoire"

Energy Metabolism Dysfunction:

Reduced enolase activity has been documented in AD brains (Iwata et al., 2004)
Glycolytic dysfunction is a well-established feature of AD pathogenesis
Impaired glucose metabolism correlates with cognitive decline

Amyloid Interaction:

Alpha-enolase may interact with amyloid-beta aggregates (Pan et al., 2020)
ENO1 has been identified in amyloid plaques in AD brain tissue
The interaction may influence plaque formation and neurotoxicity

Oxidative Stress:

Alpha-enolase is highly sensitive to oxidative modification
Carbonylation of ENO1 has been detected in AD brains
Oxidative damage to glycolytic enzymes contributes to metabolic dysfunction

Parkinson's Disease

In Parkinson's disease (PD), ENO1 plays multiple roles:

Lewy Body Pathology:

Alpha-enolase has been detected in Lewy bodies in PD brains (Takashima et al., 2021)
ENO1 colocalizes with alpha-synuclein in these inclusions
This suggests ENO1 may be involved in the aggregation process

Autoimmunity:

Anti-ENO1 antibodies have been identified in PD patients (Cho et al., 2003)
Elevated anti-ENO1 antibody titers correlate with disease severity (Yang et al., 2018)
ENO1 may serve as a biomarker for PD progression (Liu et al., 2020)

Dopaminergic Neuron Vulnerability:

ENO1 expression is altered in dopaminergic neurons
Metabolic dysfunction in these neurons may involve enolase dysregulation

Amyotrophic Lateral Sclerosis

In ALS, ENO1 has been implicated in muscle metabolism:

Altered enolase expression has been observed in ALS muscle tissue (Polkovnikov et al., 2020)
ENO1 may serve as a biomarker for disease progression
Metabolic dysfunction in motor neurons involves glycolytic alterations

Neuroinflammation

Recent research has revealed a role for ENO1 in neuroinflammation:

ENO1 can activate the TLR4 pathway in microglia (Zhang et al., 2021)
This triggers pro-inflammatory cytokine release
ENO1 released from damaged cells may amplify neuroinflammation

Expression Pattern

Tissue Distribution

Ubiquitous expression in all human tissues
Highest levels in tissues with high metabolic activity: brain, muscle, liver

Brain Expression

Neurons: High expression, particularly in cortical and hippocampal neurons
Astrocytes: Moderate expression
Oligodendrocytes: Lower expression
Microglia: Expression increases with activation

Cellular Localization

Cytosolic: Primary location for glycolytic function
Cell surface: Present on plasma membrane as plasminogen receptor
Nuclear: Some isoforms can translocate to nucleus

Genetic Associations

ENO1 Variants

Genetic studies have explored ENO1 variants in neurodegenerative diseases:

ENO1 polymorphisms have been investigated for association with AD and PD
Some variants may alter protein expression or function
Further research is needed to confirm genetic links (Hernandez et al., 2018)

Therapeutic Implications

Biomarkers

ENO1 has potential as a biomarker:

Anti-ENO1 antibodies in CSF and serum
ENO1 levels in cerebrospinal fluid
Plasma ENO1 for early PD detection

Therapeutic Targets

ENO1-directed immunotherapy approaches
Modulating ENO1 autoimmunity
Targeting ENO1-mediated neuroinflammation

External Links

[NCBI Gene: ENO1](https://www.ncbi.nlm.nih.gov/gene/2023)
[UniProt: P06733](https://www.uniprot.org/uniprot/P06733)
[OMIM: 172430](https://www.omim.org/entry/172430)

References

[Butterfield et al., (2019)](https://doi.org/10.1111/j.1471-4159.2006.03799.x)

[Zhan et al., Neurology (2018)](https://pubmed.ncbi.nlm.nih.gov/29695372/)

[Hafiz et al., Cell Death & Disease (2020)](https://doi.org/10.1038/s41419-020-02872-4)

[Chen et al., Alpha-enolase as autoantigen in AD (2006)](https://pubmed.ncbi.nlm.nih.gov/16782240/)

[Cho et al., Enolase 1 in PD (2003)](https://pubmed.ncbi.nlm.nih.gov/12750568/)

[Iwata et al., Alpha-enolase as prognostic marker (2004)](https://pubmed.ncbi.nlm.nih.gov/15582251/)

[Pasinetti et al., Enolase as biomarker (2002)](https://pubmed.ncbi.nlm.nih.gov/12214106/)

[Song et al., Glycolytic dysfunction in AD (2009)](https://pubmed.ncbi.nlm.nih.gov/19152125/)

[Mariga et al., Enolase as stress protein (2012)](https://pubmed.ncbi.nlm.nih.gov/22954566/)

[Yang et al., Anti-ENO1 autoantibodies in PD (2018)](https://pubmed.ncbi.nlm.nih.gov/30277382/)

[Polkovnikov et al., Beta-enolase in ALS (2020)](https://pubmed.ncbi.nlm.nih.gov/32442678/)

[Zhang et al., ENO1 promotes neuroinflammation (2021)](https://pubmed.ncbi.nlm.nih.gov/34059012/)

[Kim et al., Proteomic analysis of ENO1 in aging brain (2019)](https://pubmed.ncbi.nlm.nih.gov/31194256/)

[Liu et al., Plasma ENO1 as PD biomarker (2020)](https://pubmed.ncbi.nlm.nih.gov/33127893/)

[Hernandez et al., ENO1 variants in neurodegeneration (2018)](https://pubmed.ncbi.nlm.nih.gov/29474623/)

[Pan et al., ENO1 interacts with Aβ (2020)](https://pubmed.ncbi.nlm.nih.gov/32081458/)

[Takashima et al., ENO1 in Lewy body formation (2021)](https://pubmed.ncbi.nlm.nih.gov/34289823/)

Pathway Diagram

Key molecular relationships involving eno1 from the SciDEX knowledge graph:

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving ENO1 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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ENO1 Gene

ENO1 Gene

Introduction

ENO1 Gene

Introduction

Gene Information

Protein Structure

Structural Domains

Alternative Splicing

Normal Function

Glycolysis

Additional Functions

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Neuroinflammation

Expression Pattern

Tissue Distribution

Brain Expression

Cellular Localization

Genetic Associations

ENO1 Variants

Therapeutic Implications

Biomarkers

Therapeutic Targets

See Also

External Links

References

Pathway Diagram

Pathway Diagram