ABCD3 Protein

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ABCD3 Protein

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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)

Pathway Diagram

Mermaid diagram (expand to render)

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

The protein functions as a homodimer to form an active transporter complex in the peroxisomal membrane.

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:

Lipid homeostasis disruption: Altered neuronal membrane composition

VLCFA accumulation: Lipotoxicity and oxidative stress

Impaired peroxisomal function: Energy deficit

Myelin abnormalities: White matter changes

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

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

[Steinberg et al., ABCD3 function (2012) (2012)](https://doi.org/10.1093/hmg/dds225)

[Kou et al., Peroxisomes in AD (2011) (2011)](https://doi.org/10.1016/j.neurobiolaging.2010.11.018)

[Ito et al., ABC transporters in PD (2014) (2014)](https://doi.org/10.1007/s00401-014-1250-x)

Pathway Diagram

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

Mermaid diagram (expand to render)

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Related Entities

ABCD3

▸Metadataorigin_type: v1_polymorphic_backfill

slug	proteins-abcd3
kg_node_id	ABCD3
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-2b86e85e8326
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-abcd3'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

45%

Debates

Incoming

Outgoing

0 supporting 0 contradicting 0 neutral

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🌍 Provenance Graph 1 nodes, 0 edges

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This artifact has no version history yet.

Linked Artifacts (38)

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Reference URLs

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📗 Cite This Artifact

ABCD3 Protein

ABCD3 Protein (ATP-Binding Cassette Transporter D3)

Pathway Diagram

ABCD3 Protein (ATP-Binding Cassette Transporter D3)

Pathway Diagram

Overview

Structure

Biological Function

Peroxisomal Import

Tissue-Specific Roles

Role in Neurodegeneration

Peroxisome-Neuron Connection

Implications for Alzheimer's Disease

Implications for Parkinson's Disease

Genetic Considerations

Therapeutic Implications

Drug Targets

Biomarkers

See Also

External Links

Peroxisomal Biogenesis

Metabolic Diseases

Therapeutic Approaches

Biomarkers

Brain Atlas Resources

References

Pathway Diagram

💬 Discussion