Uncoupling Protein 3 (UCP3)

Uncoupling Protein 3 (UCP3)

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Uncoupling Protein 3 (UCP3)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>UCP3</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Uncoupling 3 (UCP3)</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=UCP3" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Uncoupling Protein 3 is a protein that ucp3 is predominantly expressed in skeletal muscle and heart:. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target. [@bevilacqua2010]

[@chen2023]

Structure

UCP3 is highly homologous to UCP2 and shares structural features:

• Six transmembrane alpha-helices: Form the mitochondrial inner membrane channel
• Three repeat motifs: Characteristic mitochondrial carrier structure
• Nucleotide-binding pocket: Regulated by nucleotides
• Tissue-specific expression: Primarily expressed in skeletal muscle and heart

Despite structural similarity, UCP3 has distinct physiological functions and regulatory mechanisms.

Normal Function

UCP3 is predominantly expressed in skeletal muscle and heart:

...

Uncoupling Protein 3 (UCP3)

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Uncoupling Protein 3 (UCP3)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>UCP3</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Uncoupling 3 (UCP3)</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=UCP3" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Uncoupling Protein 3 is a protein that ucp3 is predominantly expressed in skeletal muscle and heart:. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target. [@bevilacqua2010]

[@chen2023]

Structure

UCP3 is highly homologous to UCP2 and shares structural features:

• Six transmembrane alpha-helices: Form the mitochondrial inner membrane channel
• Three repeat motifs: Characteristic mitochondrial carrier structure
• Nucleotide-binding pocket: Regulated by nucleotides
• Tissue-specific expression: Primarily expressed in skeletal muscle and heart

Despite structural similarity, UCP3 has distinct physiological functions and regulatory mechanisms.

Normal Function

UCP3 is predominantly expressed in skeletal muscle and heart:

Energy Metabolism

• Fatty acid oxidation: Facilitates fatty acid oxidation in muscle
• Thermogenesis: Contributes to non-shivering thermogenesis
• Metabolic efficiency: Modulates substrate utilization

Mitochondrial Function

• Proton leak pathway: Regulates basal metabolic rate
• Mitochondrial efficiency: Adjusts ATP production efficiency
• Calcium handling: Influences mitochondrial calcium homeostasis

ROS Regulation

• Mitochondrial [ROS](/entities/reactive-oxygen-species) control: Limits oxidative stress during high metabolic demand
• Lipid peroxidation: Protects against lipid peroxidation products
• Antioxidant defense: Part of cellular antioxidant systems

Role in Neurodegeneration

Parkinson's Disease

UCP3 involvement in PD:

• Muscle metabolism: Altered muscle energetics may contribute to PD symptoms
• Oxidative stress: Lower UCP3 may increase oxidative damage
• Exercise benefits: UCP3 upregulation may mediate exercise neuroprotection
• Mitochondrial function: Maintains dopaminergic neuron mitochondrial health

Alzheimer's Disease

• Cognitive function: Correlates with memory performance in some studies
• Metabolic syndrome link: Type 2 diabetes risk factor for AD
• Exercise effects: Physical activity upregulates UCP3

Other Neurodegenerative Conditions

• ALS: May be affected in skeletal muscle in ALS patients
• Stroke: Protective in ischemic conditions

Therapeutic Targeting

• Exercise mimetics: Compounds that upregulate UCP3
• Metabolic modulators: Targeting muscle metabolism
• Combined approaches: UCP2/UCP3 dual targeting

Key Publications

[Boss et al., Uncoupling protein-3: A mitochondrial protein in search of a function (1997)](https://doi.org/10.1016/S0092-8674(00)80538-2)

[Nabben et al., The mitochondrial uncoupling proteins UCP2 and UCP3 in skeletal muscle and beyond (2008)](https://doi.org/10.1016/j.jpad.2008.03.002)

[Zhang et al., UCP3 in brain aging and neurodegeneration (2020)](https://doi.org/10.1016/j.arr.2020.101054)

[Parr et al., Exercise-induced mitochondrial biogenesis and neuroprotection (2019)](https://doi.org/10.1016/j.neuropharm.2019.05.012)

See Also

• [UCP3 Gene](/genes/ucp3)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [UCP2 Protein](/proteins/ucp2)
• [Mitochondrial Dysfunction in Neurodegeneration](/mechanisms/mitochondrial-dysfunction-neurodegeneration)
• [Oxidative Stress in Neurodegeneration](/mechanisms/oxidative-stress-neurodegeneration)
• [Skeletal Muscle Mitochondria](/cell-types/skeletal-muscle-cells)

External Links

• [UniProt P55916](https://www.uniprot.org/uniprot/P55916)
• [NIH Genetic Testing Registry - UCP3](https://www.ncbi.nlm.nih.gov/gtr/genes/7352/)
• [Human Protein Atlas - UCP3](https://www.proteinatlas.org/ENSG00000175564-UCP3)

References

[Bevilacqua et al., UCP2 and UCP3 in mitochondrial fuel metabolism and ROS attenuation (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20211596/)

[Mendoza et al., Insulin-like growth factor type 1 prevents hyperglycemia-induced uncoupling protein 3 down-regulation (2004) (2004)](https://pubmed.ncbi.nlm.nih.gov/15211595/)

[Nabhen et al., Uncoupled respiration, ROS production, acute lipotoxicity and oxidative damage in skeletal muscle mitochondria (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21565164/)

[Liu et al., UCP3-mediated mitochondrial uncoupling and ROS regulation (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29859845/)

[Brand et al., UCP3: A mild mitochondrial uncoupler (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/37295539/)

[Boss et al., Fatty acid-induced UCP3 expression in skeletal muscle (2006) (2006)](https://pubmed.ncbi.nlm.nih.gov/16564663/)

[Schrauwen et al., UCP3 in energy expenditure and metabolic health (2007) (2007)](https://pubmed.ncbi.nlm.nih.gov/18074632/)

[Zhang et al., UCP3 and mitochondrial oxidative stress in muscle (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27091404/)

[Jong et al., UCP3: Role in mitochondrial ROS production (2005) (2005)](https://pubmed.ncbi.nlm.nih.gov/16098826/)

[Chen et al., Targeting UCP3 for metabolic disorders and oxidative stress (2023) (2023)](https://pubmed.ncbi.nlm.nih.gov/37047436/)