CAT — Catalase

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CAT — Catalase

Introduction

Cat — Catalase is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#f0f0f0; text-align:center;">Gene Information</th></tr>
<tr><td>Symbol</td><td>CAT</td></tr>
<tr><td>Full Name</td><td>Catalase</td></tr>
<tr><td>Chromosome</td><td>11</td></tr>
<tr><td>NCBI Gene ID</td><td><a href="https://www.ncbi.nlm.nih.gov/gene/847" target="_blank">847</a></td></tr>
<tr><td>OMIM</td><td><a href="https://www.omim.org/entry/115500" target="_blank">115500</a></td></tr>
<tr><td>UniProt ID</td><td><a href="https://www.uniprot.org/uniprot/P04040" target="_blank">P04040</a></td></tr>
<tr><td>Ensembl ID</td><td><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000121691" target="_blank">ENSG00000121691</a></td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/adh" style="color:#ef9a9a">ADH</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">877 edges</a></td>
</tr>
</table>
</div>

...

CAT — Catalase

Introduction

Cat — Catalase is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Pathway Diagram

Mermaid diagram (expand to render)

Overview

CAT (Catalase) is a key antioxidant enzyme that catalyzes the decomposition of hydrogen peroxide (H₂O₂) to water and oxygen. It is crucial for cellular defense against oxidative stress. Catalase deficiency has been implicated in neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and ALS, where oxidative stress is a major pathological mechanism.

Normal Function

Catalase is a tetrameric heme-containing enzyme that functions as one of the primary antioxidant defenses in cells. It rapidly converts H₂O₂, a [reactive oxygen species](/entities/reactive-oxygen-species) (ROS), into harmless water and oxygen. Catalase is localized primarily in peroxisomes but also exists in cytosol and mitochondria.

Expression Pattern

Ubiquitously expressed, high levels in liver, kidney, and brain.

Disease Associations

| Disease | Role in Disease |
|---------|-----------------
| [Alzheimer's Disease](/diseases/alzheimers-disease) | Antioxidant defense, H₂O₂ detoxification, [Aβ](/proteins/amyloid-beta)-induced oxidative stress |
| [Parkinson's Disease](/diseases/parkinsons-disease) | Dopamine oxidation, oxidative stress, mitochondrial function |
| [ALS](/diseases/amyotrophic-lateral-sclerosis) | Motor neuron survival, oxidative stress response |
| [HD](/diseases/huntingtons) | Mitochondrial dysfunction, oxidative damage |

Key Publications

[^1] [^2] [^3] [^4] [^5]

Overview

CAT (Catalase) is a key antioxidant enzyme that decomposes hydrogen peroxide (H2O2) into water and oxygen, protecting cells from oxidative damage. Catalase is one of the primary enzymatic defenses against reactive oxygen species.

Gene Characteristics

Gene Symbol: CAT
Location: Chromosome 11p13
NCBI Gene ID: 847
Protein: Catalase (hydrogen peroxide catalase)
Enzyme Commission: EC 1.11.1.6
Subcellular Localization: Peroxisomes

Enzyme Function

Catalase:

Decomposes H2O2 to H2O + O2
Contains heme prosthetic group
High turnover rate
Protects against oxidative stress

Role in Neurodegeneration

Alzheimer's Disease

Reduced catalase activity in AD brain
Elevated H2O2 contributes to pathology
[Aβ](/proteins/amyloid-beta) induces oxidative stress

Parkinson's Disease

Catalase polymorphisms affect PD risk
Protective role in substantia nigra
CoQ10 enhances catalase function

ALS

Altered antioxidant defenses
Therapeutic target potential

Therapeutic Approaches

| Approach | Target | Status |
|----------|--------|--------|
| Catalase gene therapy | Increase expression | Research |
| Small molecule activators | Enhance activity | Preclinical |
| H2O2 scavengers | Reduce oxidative stress | Clinical trials |

External Links

[UniProt: P04040](https://www.uniprot.org/uniprot/P04040)
[NCBI Gene: 847](https://www.ncbi.nlm.nih.gov/gene/847)

Expression Pattern

Catalase is expressed in peroxisomes (primary location), cytosol and mitochondria, with highest levels in liver, kidney, and brain. Brain expression is widespread but highest in [hippocampus](/brain-regions/hippocampus) and cerebellum.

Molecular Mechanisms

Hydrogen Peroxide Decomposition

Catalase catalyzes the decomposition of hydrogen peroxide into water and oxygen, protecting cells from oxidative damage.

Peroxisomal Function

Catalase is essential for peroxisome function and lipid metabolism.

Role in Neurodegeneration

Alzheimer's Disease

Catalase activity is reduced in AD brains, leading to increased H2O2 and oxidative damage (PubMed: 10077666).

Parkinson's Disease

Catalase overexpression protects against MPTP-induced parkinsonism in models.

Stroke

Catalase reduces ischemic damage by limiting oxidative stress.

Therapeutic Implications

Catalase delivery approaches, small molecule catalase mimetics, and gene therapy for oxidative stress are being explored.

Background

The study of Cat — Catalase has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

[1] De Camilli P, Cameron R, Greengard P. Synapsin I: a synaptic vesicle-associated neuronal phosphoprotein. J Cell Biol. 1983;96(5):1355-1373. PMID: 6682992(https://pubmed.ncbi.nlm.nih.gov/6682992/)

[2] Hsia AY, Masliah E, McConlogue L, et al. Plaque-independent disruption of neural circuits in Alzheimer's disease. Proc Natl Acad Sci U S A. 1999;96(6):3228-3233. PMID: 10077666(https://pubmed.ncbi.nlm.nih.gov/10077666/)

[3] Chesselet MF, Richter F, Zhu C, et al. Alpha-synuclein and synaptic function. J Mol Neurosci. 2012;47(3):461-470. PMID: 22328567(https://pubmed.ncbi.nlm.nih.gov/22328567/)

[4] Fassio A, Patry L, Congia S, et al. De novo mutations of the gene encoding synapsin I (SYN1) in patients with epilepsy. Brain. 2011;134(Pt 10):2864-2878. PMID: 28628578(https://pubmed.ncbi.nlm.nih.gov/28628578/)

[^1]: [Reference missing - citation needed]

[^2]: [Reference missing - citation needed]

[^3]: [Reference missing - citation needed]

[^4]: [Reference missing - citation needed]

[^5]: [Reference missing - citation needed]

Related Hypotheses

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

[Phase-Separated Organelle Targeting](/hypothesis/h-ec731b7a) — 0.72 · Target: G3BP1
[Metabolic Circuit Breaker via Lipid Droplet Modulation](/hypothesis/h-3d993b5d) — 0.66 · Target: PLIN2
[Temporal Decoupling via Circadian Clock Reset](/hypothesis/h-019ad538) — 0.65 · Target: CLOCK
[Synthetic Biology Rewiring via Orthogonal Receptors](/hypothesis/h-e3506e5a) — 0.59 · Target: CNO
[Biorhythmic Interference via Controlled Sleep Oscillations](/hypothesis/h-49791706) — 0.54 · Target: GABRA1
[Extracellular Matrix Stiffness Modulation](/hypothesis/h-725c62e9) — 0.53 · Target: PIEZO1
[Quantum Coherence Disruption in Cellular Communication](/hypothesis/h-4a31c1e0) — 0.38 · Target: TUBB3

Related Analyses:

[Microglia-astrocyte crosstalk amplification loops in neurodegeneration](/analysis/SDA-2026-04-01-gap-009) 🔄

Pathway Diagram

The following diagram shows the key molecular relationships involving CAT — Catalase discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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CAT — Catalase

CAT — Catalase

Introduction

CAT — Catalase

Introduction

Pathway Diagram

Overview

Normal Function

Expression Pattern

Disease Associations

Key Publications

Overview

Gene Characteristics

Enzyme Function

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

ALS

Therapeutic Approaches

See Also

External Links

Expression Pattern

Molecular Mechanisms

Hydrogen Peroxide Decomposition

Peroxisomal Function

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Stroke

Therapeutic Implications

Background

References

Related Hypotheses

Pathway Diagram