WIPI2 Protein - Autophagy Protein

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WIPI2 Protein - Autophagy Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">WIPI2 Protein - Autophagy Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>WD Repeat Domain, Phosphoinositide Interacting 2</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>WIPI2</td>
</tr>
<tr>
<td class="label">Gene ID</td>
<td>26100</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>7p11.2</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9Y5P9</td>
</tr>
<tr>
<td class="label">PDB ID</td>
<td>4CR2, 5YXI</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>54 kDa</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, omegasomes, autophagosomes</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>PROPPIN family (WIPI1-4)</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Agent</td>
</tr>
<tr>
<td class="label">Autophagy inducers</td>
<td>Rapamycin, Everolimus</td>
</tr>
<tr>
<td class="label">Autophagy enhancers</td>
<td>Trehalose</td>
</tr>
<tr>
<td class="label">VPS34 inhibitors</td>
<td>VPS34-IN1</td>
</tr>
<tr>
<td class="label">ATG proteins</td>
<td>Gene therapy</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a"

...

WIPI2 Protein - Autophagy Protein

Introduction

Pathway Diagram

Mermaid diagram (expand to render)

Wipi2 Protein [Autophagy](/entities/autophagy) 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

WIPI2 (WD Repeat Domain, Phosphoinositide Interacting 2) is a PtdIns3P-binding protein essential for autophagosome formation during macroautophagy. As a member of the PROPPIN (β-propeller that binds polyphosphoinositides) family, WIPI2 plays a critical role in recruiting the ATG16L1 complex to developing autophagosomes, facilitating LC3 lipidation and membrane expansion. WIPI2-mediated autophagy is crucial for cellular homeostasis, protein quality control, and clearance of aggregate-prone proteins. Dysregulated WIPI2 function has been implicated in Alzheimer's disease, Parkinson's disease, and various neurodegenerative conditions. [@autophagy]

Gene and Protein Information

Protein Structure

WIPI2 contains characteristic structural features:

WD40 repeat domains: Seven propeller blades forming a β-sheet platform
PtdIns3P-binding site: Conserved pocket for phosphatidylinositol 3-phosphate binding
FRRG motif: Phenylalanine-Arginine-Arginine-Glycine region for ATG16L1 interaction

Structural studies (PDB: 4CR2) reveal the seven-bladed β-propeller architecture with:

Membrane-binding surface for PtdIns3P
Protein-protein interaction interfaces
Conformational flexibility for autophagy regulation

Normal Function in Autophagy

WIPI2 functions at multiple stages of autophagosome biogenesis:

Early Stages

PI3P production: VPS34 complex generates PtdIns3P at phagophore assembly site (PAS)

WIPI2 recruitment: PtdIns3P recruits WIPI2 to nascent phagophores

Membrane expansion: WIPI2 promotes omegasome formation and curvature

LC3 Lipidation

ATG16L1 recruitment: WIPI2 directly recruits the ATG16L1-ATG5-ATG12 complex
LC3 conjugation: Facilitates ATG3-mediated LC3-II formation
Membrane closure: Essential for autophagosome completion

Selective Autophagy

Cargo recognition: Works with receptors for aggregate clearance
Organelle quality control: Mitochondrial and ER-phagy
Pathogen clearance: Xenophagy of intracellular pathogens

Role in Neurodegenerative Diseases

Alzheimer's Disease

WIPI2 dysfunction contributes to AD pathogenesis:

Autophagic-lysosomal impairment: WIPI2-dependent autophagy is compromised in AD brains
[Aβ](/proteins/amyloid-beta) accumulation: Reduced autophagic clearance leads to amyloid accumulation
Lysosomal dysfunction: WIPI2-ATG16L1 pathway disruption affects lysosomal trafficking
[Tau](/proteins/tau) pathology: Autophagy defects exacerbate [tau](/proteins/tau) aggregation

Research shows (PMID:20444417) WIPI2 is essential for autophagy and its dysfunction contributes to protein aggregate accumulation in AD.

Parkinson's Disease

[α-Synuclein](/proteins/alpha-synuclein) clearance: WIPI2-mediated autophagy clears synuclein aggregates
Mitophagy: PINK1/Parkin-independent mitophagy pathways require WIPI2
Dopaminergic vulnerability: Impaired autophagic flux in substantia nigra
LRRK2 interactions: Pathogenic LRK2 mutations affect autophagy regulation

Huntington's Disease

Mutant [huntingtin](/proteins/huntingtin-protein) clearance: WIPI2-dependent autophagy removes toxic protein species
Aggregate prevention: Enhanced autophagy reduces inclusions
Therapeutic potential: Autophagy inducers targeting WIPI2 pathway

Amyotrophic Lateral Sclerosis

Protein aggregate clearance: [TDP-43](/proteins/tdp-43) and SOD1 aggregates
Axonal transport: Autophagy in distal axons
Glial contribution: Microglial autophagy in neuroinflammation

Therapeutic Targeting

Small Molecule Modulators

Carbamazepine: Tetracyclic antidepressant, enhances autophagy
Lithium: Mood stabilizer, inositol monophosphatase inhibition
Metformin: Antidiabetic, AMPK activation

Challenges

CNS penetration
Specificity for neurodegenerative pathways
Balancing basal and induced autophagy

Key Publications

Polson HE, et al. WIPI2 is essential for autophagy and omegasome formation. Dev Cell. 2010;18(6):950-967. PMID: 20444417(https://pubmed.ncbi.nlm.nih.gov/20444417/)

PMID: 25997342(https://pubmed.ncbi.nlm.nih.gov/25997342/) - Autophagy in brain function

PMID: 26245252(https://pubmed.ncbi.nlm.nih.gov/26245252/) - Protein quality control in neurodegeneration

PMID: 26437361(https://pubmed.ncbi.nlm.nih.gov/26437361/) - Autophagy in neurodegeneration

External Links

[UniProt](https://www.uniprot.org/uniprot/Q9Y5P9)
[PDB](https://www.rcsb.org/structure/4CR2)
[NCBI Protein](https://www.ncbi.nlm.nih.gov/protein/?term=WIPI2)
[GeneCards](https://www.genecards.org/cgi-bin/carddisp.pl?gene=WIPI2)
[Gene Ontology](https://amigo.geneontology.org/amigo/search/annotation?q=WIPI2)

Background

The study of Wipi2 Protein Autophagy 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.

References

[Unknown, - WIPI2 is essential for autophagy and omegasome formation (n.d.)](https://pubmed.ncbi.nlm.nih.gov/20444417/)

[Unknown, - Autophagy in brain function and disease (n.d.)](https://pubmed.ncbi.nlm.nih.gov/25997342/)

[Unknown, - Protein quality control in neurodegeneration (n.d.)](https://pubmed.ncbi.nlm.nih.gov/26245252/)

[Unknown, - Sirtuins in neurodegeneration (n.d.)](https://pubmed.ncbi.nlm.nih.gov/26437361/)

[Unknown, - Cellular stress responses in AD (n.d.)](https://pubmed.ncbi.nlm.nih.gov/24668245/)

[Unknown, - Developmental pathways in neurodegeneration (n.d.)](https://pubmed.ncbi.nlm.nih.gov/25009184/)

[Unknown, - Autophagy in neuroinflammation (n.d.)](https://pubmed.ncbi.nlm.nih.gov/27288389/)

[Unknown, - Mitophagy in Parkinson's disease (n.d.)](https://pubmed.ncbi.nlm.nih.gov/28528871/)

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WIPI2 Protein - Autophagy Protein

WIPI2 Protein - Autophagy Protein

Introduction

WIPI2 Protein - Autophagy Protein

Introduction

Pathway Diagram

Overview

Gene and Protein Information

Protein Structure

Normal Function in Autophagy

Early Stages

LC3 Lipidation

Selective Autophagy

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Huntington's Disease

Amyotrophic Lateral Sclerosis

Therapeutic Targeting

Small Molecule Modulators

Challenges

Key Publications

See Also

External Links

Background

References