VPS4 Protein

VPS4 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">VPS4 Protein</th>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">VPS4 activators</td>
<td>Research</td>
</tr>
<tr>
<td class="label">ESCRT modulators</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Research</td>
</tr>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
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</table>

Vps4 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

VPS4 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">VPS4 Protein</th>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">VPS4 activators</td>
<td>Research</td>
</tr>
<tr>
<td class="label">ESCRT modulators</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Research</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Vps4 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

VPS4 (Vacuolar Protein Sorting 4 Homolog) is an AAA+ ATPase that functions in the final stages of multivesicular body (MVB) sorting and autophagy. It is essential for the disassembly of the ESCRT-III complex and the recycling of ESCRT components from endosomal membranes. VPS4 dysfunction contributes to neurodegenerative diseases including Alzheimer's and ALS. [@urwin2018]

Structure

VPS4 is a ~437 amino acid AAA+ ATPase: [@lindhout2021]

• N-terminal MIT (Microtubule Interacting and Trafficking) domain: Binds to ESCRT-III proteins
• AAA+ ATPase domain: Hexameric ring that hydrolyzes ATP for disassembly
• C-terminal region: Contains autoinhibitory domain

Isoforms

• VPS4A: Ubiquitously expressed isoform
• VPS4B: Predominantly expressed in neuronal tissues

Normal Function

VPS4 is the final executor of membrane remodeling:

• ESCRT-III disassembly: Uses ATP hydrolysis to disassemble ESCRT-III polymers
• MVB sorting: Essential for sorting ubiquitinated cargo into intralumenal vesicles
• Autophagosome closure: Involved in autophagosome closure and lysosomal fusion
• Cytokinetic abscission: Required for membrane fission during cytokinesis
• Viral budding: Facilitates budding of enveloped viruses

ATPase Cycle

Role in Disease

Alzheimer's Disease

• VPS4 dysfunction impairs MVB sorting of [amyloid precursor protein](/entities/app-protein) (APP)
• Contributes to amyloid-β generation and secretion
• Reduced VPS4 in AD brains

ALS/FTD

• VPS4A mutations identified in ALS cases
• Impaired endolysosomal trafficking
• Contributes to [TDP-43](/proteins/tdp-43) proteinopathy

Parkinson's Disease

• VPS4 involved in mitophagy
• Impaired autophagic clearance of damaged mitochondria
• Lysosomal dysfunction in PD models

Huntington's Disease

• VPS4 activity impaired in HD
• Contributes to mutant [huntingtin](/proteins/huntingtin-protein) accumulation
• [Autophagy](/entities/autophagy) defects in HD [neurons](/entities/neurons)

Therapeutic Targeting

Key Publications

See Also

• [Autophagy-Lysosomal Pathway](/mechanisms/autophagy-lysosomal-pathway)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [ALS](/diseases/amyotrophic-lateral-sclerosis)
• [Protein Quality Control Network](/mechanisms/protein-quality-control-network)

External Links

• [UniProt: VPS4A](https://www.uniprot.org/uniprot/Q9UN37)
• [PDB: VPS4 Hexamer](https://www.ebi.ac.uk/pdbe/entry/pdb/2j0l)
• [NCBI Gene: VPS4A](https://www.ncbi.nlm.nih.gov/gene/27072)
• [AAA+ ATPase Database](https://mcl1.neb.com/)

VPS4 and Neurodegeneration

Molecular Mechanisms

• Impaired ESCRT-III disassembly leading to endosomal trafficking defects
• Accumulation of aberrant multivesicular bodies
• Dysregulated autophagosome-lysosome fusion
• Defective cargo sorting in the endolysosomal pathway

Alzheimer's Disease

• VPS4A expression reduced in AD prefrontal [cortex](/brain-regions/cortex)
• Contributes to APP processing abnormalities
• Impaired clearance of amyloid-β through endosomal pathways
• Correlates with [tau](/proteins/tau) pathology severity

ALS/FTD

• VPS4A mutations identified in familial ALS cases
• Dysregulated endolysosomal trafficking contributes to [TDP-43](/mechanisms/tdp-43-proteinopathy) mislocalization
• Impaired autophagic clearance of ubiquitinated proteins

Therapeutic Implications

• VPS4 activity modulators in development
• Gene therapy approaches to restore VPS4 function
• Combination therapies targeting ESCRT pathway

Research Directions

Current research focuses on:

• Developing VPS4-specific activators
• Understanding isoform-specific functions in neurons
• Identifying biomarkers for VPS4 dysfunction
• Gene therapy vectors for neuronal VPS4 expression

Background

The study of Vps4 Protein 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.

Brain Atlas Resources

• Allen Human Brain Atlas: [VPS4 expression search](https://human.brain-map.org/microarray/search/show?search_term=VPS4)
• Allen Cell Type Atlas: [Transcriptomic cell type reference](https://portal.brain-map.org/atlases-and-data/rnaseq)
• Allen Mouse Brain Atlas: [VPS4 search](https://mouse.brain-map.org/search/index.html?query=VPS4)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving VPS4 Protein discovered through SciDEX knowledge graph analysis: