ABCD3 Protein

ABCD3 Protein (ATP-Binding Cassette Transporter D3)

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4ea;">ABCD3</th></tr> [@ito2014]
<tr><td><b>Gene</b></td><td>[ABCD3](/genes/abcd3)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[O75323](https://www.uniprot.org/uniprot/O75323)</td></tr>
<tr><td><b>PDB Structure</b></td><td>7B7D</td></tr>
<tr><td><b>Molecular Weight</b></td><td>79.7 kDa</td></tr>
<tr><td><b>Subcellular Localization</b></td><td>Peroxisomal membrane</td></tr>
<tr><td><b>Protein Family</b></td><td>ABC transporter subfamily D</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">306 edges</a></td>
</tr>
</table>
</div>

Pathway Diagram

ABCD3 Protein (ATP-Binding Cassette Transporter D3)

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4ea;">ABCD3</th></tr> [@ito2014]
<tr><td><b>Gene</b></td><td>[ABCD3](/genes/abcd3)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[O75323](https://www.uniprot.org/uniprot/O75323)</td></tr>
<tr><td><b>PDB Structure</b></td><td>7B7D</td></tr>
<tr><td><b>Molecular Weight</b></td><td>79.7 kDa</td></tr>
<tr><td><b>Subcellular Localization</b></td><td>Peroxisomal membrane</td></tr>
<tr><td><b>Protein Family</b></td><td>ABC transporter subfamily D</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">306 edges</a></td>
</tr>
</table>
</div>

Pathway Diagram

Overview

ABCD3 Protein is a peroxisomal ATP-binding cassette (ABC) transporter involved in the import of very long-chain fatty acids (VLCFAs) and other metabolites into peroxisomes. The protein is encoded by the [ABCD3](/genes/abcd3) gene located on chromosome 1p22.1 and is expressed in multiple tissues, with highest levels in liver, kidney, and brain.

Structure

ABCD3 is a peroxisomal membrane protein with characteristic ABC transporter architecture:

• Nucleotide-binding domain (NBD): Two NBDs containing Walker A (P-loop) and Walker B motifs
• ABC signature (C-loop): Consensus sequence specific to ABC transporters
• Transmembrane domains: Six alpha-helical transmembrane segments
• N-terminal membrane-anchored domain: Contains multiple transmembrane segments

Biological Function

Peroxisomal Import

ABCD3 transports various substrates into peroxisomes:

| Substrate | Metabolic Pathway | Importance |
|-----------|-------------------|------------|
| Very long-chain fatty acids (VLCFAs, C22+) | β-oxidation | Energy production |
| Branched-chain fatty acids | Metabolism | Brain lipid homeostasis |
| Dicarboxylic acids | ω-oxidation | Detoxification |
| Bile acid intermediates | Synthesis | Liver function |
| Polyunsaturated fatty acids | Membrane composition | Neuronal health |

Tissue-Specific Roles

• Liver: Primary site of VLCFA β-oxidation
• Kidney: Fatty acid metabolism
• Brain: Very long-chain fatty acid homeostasis critical for neuronal membranes

Role in Neurodegeneration

Peroxisome-Neuron Connection

Peroxisomes are essential for neuronal health:

• VLCFA oxidation prevents toxic accumulation
• Plasmalogen synthesis for myelin
• [ROS](/entities/reactive-oxygen-species) detoxification via catalase
• Docosahexaenoic acid (DHA) metabolism

Implications for Alzheimer's Disease

ABCD3 dysfunction may contribute to AD pathogenesis:

Implications for Parkinson's Disease

Peroxisomal dysfunction also affects PD:

• Mitochondrial-peroxisomal cross-talk
• Lipid metabolism in dopaminergic [neurons](/entities/neurons)
• [α-Synuclein](/proteins/alpha-synuclein) interaction with peroxisomes

Genetic Considerations

While ABCD3 mutations are not common causes of neurodegeneration:

• Polymorphisms may modify disease risk
• Expression changes observed in AD/PD brains
• Potential modifier gene role

Therapeutic Implications

Drug Targets

Peroxisomal ABC transporters are potential drug targets:

• Modulators: Compounds enhancing transporter function
• Substrate reduction: Decreasing VLCFA burden
• Gene therapy: Restoring ABCD3 expression

Biomarkers

ABCD3 expression may serve as:

• Peroxisomal function indicator
• Disease progression marker
• Therapeutic response biomarker

See Also

• [ABCD3 Gene](/genes/abcd3)

External Links

• [GeneCards: ABCD3](https://www.genecards.org/cgi-bin/carddisp.pl?gene=ABCD3)

Peroxisomal Biogenesis

ABCD3 is essential for peroxisome function:

• Import of membrane proteins
• Peroxisome proliferation
• Matrix protein import coordination
• Organelle quality control

Metabolic Diseases

Peroxisomal dysfunction causes:

• Zellweger spectrum disorders
• X-linked adrenoleukodystrophy
• Refsum disease
• Modified risk in metabolic syndrome

Therapeutic Approaches

Strategies for treating peroxisomal disorders:

• Loren gene therapy: Restoring ABCD function
• Substrate reduction therapy: Lowering VLCFA burden
• Anti-oxidant treatment: Reducing oxidative stress
• Lifestyle interventions: Diet modification

Biomarkers

ABCD3 as a disease biomarker:

• Expression levels in blood
• Fibroblast function assays
• VLCFA measurements
• Imaging biomarkers

Brain Atlas Resources

• [Allen Human Brain Atlas](https://human.brain-map.org/) — protein expression data
• [Allen Cell Type Atlas](https://celltypes.brain-map.org/) — cell type specific expression
• [BrainSpan Atlas](https://brainspan.org/) — developmental transcriptome
• [Allen Mouse Brain Atlas](https://mouse.brain-map.org/) — mouse brain expression

References

Pathway Diagram

The following diagram shows the key molecular relationships involving ABCD3 Protein discovered through SciDEX knowledge graph analysis: