WIPI2 Protein - Autophagy Protein

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

<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">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/ataxia" style="color:#ef9a9a">Ataxia</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">296 edges</a></td>
</tr>
</table>

Pathway Diagram

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

• 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

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

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

See Also

• [WIPI2 Gene](/proteins/wipi2-protein)
• [WIPI1 Protein](/proteins/wipi1-protein)
• [ATG16L1 Protein](/proteins/atg16l1-protein)
• [ATG14 Protein](/proteins/atg14-protein)
• [LC3 Protein](/proteins/lc3-protein)
• [Autophagy-Lysosomal Pathway](/mechanisms/autophagy-lysosomal-pathway)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

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