BECN1 Protein

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BECN1 Protein

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BECN1 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">BECN1 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>BECLIN1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>BECN1</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=BECLIN1" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <a href="/wiki/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">473 edges</a></td>
</tr>
</table>

Pathway Diagram

...

BECN1 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">BECN1 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>BECLIN1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>BECN1</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=BECLIN1" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <a href="/wiki/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">473 edges</a></td>
</tr>
</table>

Pathway Diagram

Mermaid diagram (expand to render)

BECLIN1 (Beclin-1) is a fundamental [autophagy](/entities/autophagy)-regulating protein encoded by the BECN1 gene, located on chromosome 17q21. As a key component of the class III phosphatidylinositol 3-kinase (PI3K-III) complex, beclin-1 serves as a master regulator of autophagosome formation and is critical for cellular homeostasis, particularly in post-mitotic [neurons](/entities/neurons) where protein quality control is essential for survival.

The protein was originally identified as a tumor suppressor, with monoallelic deletion frequently observed in human breast, ovarian, and prostate cancers. However, its role in neurodegeneration has become increasingly prominent, as autophagy dysfunction is now recognized as a central mechanism in Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS).[@kang2011]

Protein Name: BECN1 - Beclin-1
UniProt ID: Q14457
Gene: [BECN1](/genes/beclin1)
Molecular Weight: ~52 kDa (450 amino acids)
Protein Class: Autophagy protein, Tumor suppressor
Tissue Expression: Ubiquitous, high in brain, heart, liver
Subcellular Localization: Cytoplasm, Golgi apparatus, Endoplasmic reticulum

Molecular Structure

Beclin-1 contains several functional domains essential for its role in autophagy regulation:

BH3 domain: Interacts with anti-apoptotic Bcl-2 family proteins
Coiled-coil domain (CCD): Mediates homodimerization and interactions with PI3K complex members
Evolutionarily conserved domain (ECD): Critical for membrane targeting
LRR domain: Leucine-rich repeat region involved in protein-protein interactions

The protein forms a core complex with PI3K-C3/VPS34 (the catalytic subunit) and VPS15/p150, creating the functional PI3K-III complex that generates phosphatidylinositol 3-phosphate (PI3P) on isolation membranes.[@nishimura2014]

Function

Beclin-1 is a central regulator of autophagy, the process of cellular self-digestion for recycling and quality control. Key functions include:[@mizushima2011]

Autophagy initiation: Forms the PI3K complex that initiates autophagosome formation
Vesicle nucleation: Recruits membranes (from ER, Golgi, mitochondria) for autophagosome formation
Endocytosis: Regulates endocytic trafficking and receptor degradation
Phagophore expansion: Coordinates with ATG14L for omegasome formation
Tumor suppression: Acts as a tumor suppressor through autophagy-dependent mechanisms

Beclin-1 interacts with class III PI3K (PIK3C3/VPS34) to generate phosphatidylinositol 3-phosphate (PI3P), which is essential for autophagosome nucleation. The protein is subject to extensive post-translational modifications including phosphorylation, ubiquitination, and cleavage, which regulate its activity.[@choi2013]

Role in Neurodegeneration

Alzheimer Disease

Autophagy impairment: Significantly reduced beclin-1 expression observed in AD brains, particularly in vulnerable brain regions like the [hippocampus](/brain-regions/hippocampus) and [entorhinal cortex](/brain-regions/entorhinal-cortex)
Amyloid clearance: Beclin-1 modulates [APP](/entities/app-protein) processing through autophagy-dependent pathways; reduced beclin-1 leads to amyloid accumulation
Neuronal survival: Restoring beclin-1 improves autophagy and reduces amyloid pathology in mouse models
Endolysosomal dysfunction: Beclin-1 deficiency contributes to lysosomal membrane permeabilization

Parkinson Disease

Mitophagy: Beclin-1 is essential for PINK1/Parkin-dependent mitophagy; impaired mitophagy leads to mitochondrial dysfunction
[Alpha-synuclein](/proteins/alpha-synuclein) clearance: Autophagy-lysosomal pathway is critical for clearing α-synuclein aggregates; beclin-1 enhancement promotes clearance
Protein aggregation: Impaired autophagy contributes to Lewy body formation
Dopaminergic neuron vulnerability: The autophagy pathway is particularly important in dopaminergic neurons

Amyotrophic Lateral Sclerosis

Autophagy dysregulation: [TDP-43](/mechanisms/tdp-43-proteinopathy) and FUS mutations affect autophagy regulation
Protein aggregate clearance: Impaired autophagy leads to toxic protein accumulation
Motor neuron survival: Beclin-1 mediated autophagy is protective in motor neurons

Huntington Disease

[mTOR](/mechanisms/mtor-signaling-pathway)-independent beclin-1 activation: Beclin-1 activation can bypass mTOR inhibition
Mutant huntingtin clearance: Enhanced autophagy promotes clearance of mutant [huntingtin protein](/proteins/huntingtin)

Therapeutic Potential

Autophagy enhancers: Beclin-1 activating peptides (Tat-beclin 11) cross the [blood-brain barrier](/entities/blood-brain-barrier)
Small molecule inducers: Compounds that promote beclin-1 function and autophagy
Gene therapy: Viral vector-mediated increase of beclin-1 expression
Combination approaches: Beclin-1 activation with amyloid/tau-targeting therapies

Cross-Links

[BECN1 Gene](/genes/beclin1)
[Autophagy Pathway](/mechanisms/autophagy)
[Alzheimer Disease](/diseases/alzheimers-disease)
[Parkinson Disease](/diseases/parkinsons-disease)
[Amyloid Cascade Pathway](/mechanisms/amyloid-cascade)
[PINK1/Parkin Mitophagy Pathway](/mechanisms/pink1-parkin-mitophagy)

Key Publications

[Kang R et al., Beclin-1 in autophagy and disease (2011)](https://doi.org/10.1038/onc.2010.584)

[Mizushima N et al., Autophagy in health and disease (2008)](https://doi.org/10.1016/j.cell.2008.03.005)

[Levine B et al., Beclin-1 in neurodegeneration (2015)](https://doi.org/10.1038/nm.3891)

[Nixon RA et al., Autophagy failure in Alzheimer disease (2013)](https://doi.org/10.1038/nm.3232)

[Pickford F et al., Beclin-1 in early AD (2008)](https://doi.org/10.1016/j.neurobiolaging.2007.12.016)

External Links

[GeneCards: BECN1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=BECN1)

References

[Liang XH et al., Induction of autophagy and inhibition of tumorigenesis by beclin-1 (1999) (1999)](https://doi.org/10.1038/35065)

[Kang R et al., Beclin-1 in neurodegeneration (2011) (2011)](https://doi.org/10.1016/j.tcb.2011.06.007)

[Nishimura K et al., Structure and function of the PI3K-III complex (2014) (2014)](https://doi.org/10.1016/j.tcb.2014.04.005)

[Mizushima N et al., Autophagy: machinery and regulation (2011) (2011)](https://doi.org/10.1016/j.cell.2011.10.026)

[Choi AM et al., Autophagy in disease (2013) (2013)](https://doi.org/10.1056/NEJMra1205593)

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Related Entities

BECLIN1PROTEIN

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entity_type	protein
origin_type	v1_polymorphic_backfill
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wiki_page_id	wp-a9f969d8187b
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📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

100%

Debates

0

Incoming

181

Outgoing

184

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

BECN1 Protein

BECN1 Protein

Overview

Pathway Diagram

BECN1 Protein

Overview

Pathway Diagram

Molecular Structure

Function

Role in Neurodegeneration

Alzheimer Disease

Parkinson Disease

Amyotrophic Lateral Sclerosis

Huntington Disease

Therapeutic Potential

Cross-Links

Key Publications

See Also

External Links

References

💬 Discussion