ATG14 Protein

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ATG14 Protein

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ATG14 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">ATG14 Protein</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">BECN1 (Beclin 1)</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">PIK3C3 (Vps34)</td>
<td>Complex formation</td>
</tr>
<tr>
<td class="label">PIK3R4 (p150)</td>
<td>Complex formation</td>
</tr>
<tr>
<td class="label">ATG16L1</td>
<td>Downstream effector</td>
</tr>
<tr>
<td class="label">LC3/ATG8</td>
<td>Downstream effector</td>
</tr>
<tr>
<td class="label">p62/SQSTM1</td>
<td>Selective autophagy</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><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>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</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">245 edges</a></td>
</tr>
</table>

...

ATG14 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">ATG14 Protein</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">BECN1 (Beclin 1)</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">PIK3C3 (Vps34)</td>
<td>Complex formation</td>
</tr>
<tr>
<td class="label">PIK3R4 (p150)</td>
<td>Complex formation</td>
</tr>
<tr>
<td class="label">ATG16L1</td>
<td>Downstream effector</td>
</tr>
<tr>
<td class="label">LC3/ATG8</td>
<td>Downstream effector</td>
</tr>
<tr>
<td class="label">p62/SQSTM1</td>
<td>Selective autophagy</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><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>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</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">245 edges</a></td>
</tr>
</table>

ATG14 (also known as Barkor - Beclin 1-associated autophagy-related key regulator) is a crucial autophagy protein that plays a central role in the initiation of autophagosome formation. Originally identified in Drosophila melanogaster and subsequently characterized in mammalian systems, ATG14 is essential for the recruitment of the autophagy machinery to nascent autophagosomes [1].

The protein serves as a critical nexus between cellular stress signals and the autophagy degradation pathway, making it particularly relevant to neurodegenerative diseases where protein homeostasis is compromised. ATG14 contains multiple functional domains including a BARKOR binding domain that enables interaction with BECN1 (Beclin 1), a coiled-coil domain for protein-protein interactions, and a membrane-binding domain that targets the protein to autophagosome formation sites on various cellular membranes [10].

Pathway Diagram

Mermaid diagram (expand to render)

Structure and Function

Molecular Architecture

ATG14 is a 492-amino acid protein encoded by the ATG14 gene located on chromosome 14q32.3 in humans. The protein contains several key structural features:

BARKOR domain (residues 1-100): Enables binding to BECN1 (Beclin 1), the central regulator of autophagy initiation
Coiled-coil domain (residues 150-300): Mediates homodimerization and interactions with other autophagy proteins
Membrane-targeting domain (residues 400-450): Contains a lipid-binding motif that localizes ATG14 to the phagophore assembly site

The protein functions as part of the class III phosphatidylinositol 3-kinase (PI3K) complex, specifically the ATG14-PI3K complex (also known as PI3KC3-C1), which generates phosphatidylinositol 3-phosphate (PI3P) on isolation membranes [1]. This PI3P production is essential for the recruitment of downstream autophagy effectors including WIPI proteins and ATG16L1 complex.

Role in Autophagy Initiation

ATG14 plays a pivotal role in the early stages of autophagosome formation:

Phagophore nucleation: ATG14, in complex with BECN1 and PIK3C3 (Vps34), initiates the formation of the phagophore (the precursor to the autophagosome) by generating PI3P at specific membrane sites [2]

Membrane recruitment: ATG14 facilitates the recruitment of downstream ATG proteins including ATG5, ATG12, and LC3 to the expanding phagophore

Expansion coordination: The ATG14 complex coordinates the expansion of the phagophore through the lipidation of LC3 (LC3-I to LC3-II conversion)

The protein is particularly enriched at the phagophore assembly site (PAS) and on isolation membranes emanating from the endoplasmic reticulum (ER), the primary membrane source for autophagosome biogenesis [1][2].

ATG14 in Neurodegenerative Diseases

Parkinson's Disease

In Parkinson's disease (PD), ATG14 has emerged as a critical regulator of mitophagy - the selective autophagy of mitochondria. Mitochondrial dysfunction is a central pathological feature of PD, and impaired mitophagy contributes to the accumulation of damaged mitochondria in dopaminergic neurons.

Key mechanisms:

PINK1-Parkin-ATG14 pathway: Following mitochondrial damage, PINK1 accumulates on the outer mitochondrial membrane and phosphorylates both Parkin and ubiquitin. Activated Parkin then ubiquitinates mitochondrial proteins, creating a platform for the recruitment of autophagy receptors including p62/SQSTM1 and OPTN. ATG14 interacts with these receptors to direct damaged mitochondria to the autophagosome [9]
Alpha-synuclein clearance: ATG14-mediated autophagy is involved in the clearance of alpha-synuclein aggregates. Mutations in SNCA (the gene encoding alpha-synuclein) that cause familial PD can impair autophagic flux, and ATG14 upregulation has been shown to enhance alpha-synuclein degradation in cellular models [3]
Dopaminergic neuron vulnerability: The high metabolic demands and oxidative stress in dopaminergic neurons make them particularly dependent on ATG14-mediated mitophagy for mitochondrial quality control. Dysfunction of this pathway contributes to the selective vulnerability of substantia nigra pars compacta neurons in PD

Therapeutic implications:

Small molecules that enhance ATG14 expression or function are being investigated as potential PD therapeutics
Gene therapy approaches aiming to deliver ATG14 to the striatum and substantia nigra are in pre-clinical development

Alzheimer's Disease

In Alzheimer's disease (AD), ATG14 dysfunction contributes to the accumulation of amyloid-beta plaques and tau neurofibrillary tangles, two hallmark pathological features of the disease.

Key mechanisms:

Amyloid-beta clearance: ATG14-mediated autophagy participates in the clearance of extracellular amyloid-beta peptides generated from amyloid precursor protein (APP) processing. Impairment of autophagic flux leads to accumulation of amyloid-beta in autophagosomes and extracellular space [11]
Tau degradation: ATG14 is involved in the selective autophagy of hyperphosphorylated tau. The protein interacts with tau aggregates and targets them for autophagic degradation. ATG14 dysfunction contributes to tau accumulation and propagation [4]
Neuronal survival: ATG14 is essential for neuronal survival in the adult brain. Deletion of Atg14 in mouse neurons leads to accumulation of protein aggregates, mitochondrial dysfunction, and eventual neurodegeneration [5][6]

Therapeutic implications:

Enhancing ATG14 function represents a promising approach to restore amyloid-beta and tau clearance in AD
The protein's role in synaptic function and memory consolidation makes it an attractive target for maintaining cognitive function [11]

Amyotrophic Lateral Sclerosis (ALS)

In ALS, ATG14-mediated autophagy is crucial for the clearance of mutated proteins including SOD1, TDP-43, and FUS that aggregate in motor neurons.

SOD1 clearance: ATG14 participates in the autophagic degradation of mutant SOD1, and reduced ATG14 function correlates with faster disease progression in SOD1 mouse models
TDP-43 pathology: TDP-43 aggregates, a hallmark of ALS, are targeted by ATG14-mediated selective autophagy. Impairment of this pathway contributes to cytoplasmic TDP-43 accumulation
Motor neuron vulnerability: Motor neurons are particularly dependent on autophagy for protein homeostasis due to their large size and high metabolic demands

Huntington's Disease

In Huntington's disease (HD), ATG14 is involved in the clearance of mutant huntingtin protein (mHTT) containing expanded polyglutamine repeats.

mHTT degradation: ATG14-mediated selective autophagy targets mutant huntingtin for degradation. Up-regulation of ATG14 reduces mHTT aggregation and improves neuronal survival in cellular and animal models
Mitochondrial quality control: Similar to PD, ATG14-mediated mitophagy is essential for maintaining mitochondrial health in HD, where mitochondrial dysfunction is prominent

Interactions and Signaling Pathways

Protein-Protein Interactions

ATG14 interacts with several key proteins in the autophagy pathway:

Signaling Regulation

ATG14 activity is regulated by multiple signaling pathways:

mTORC1 inhibition: Nutrient deprivation and mTORC1 inhibition activate autophagy by relieving the inhibitory phosphorylation of ATG14, promoting its recruitment to the phagophore assembly site

AMPK activation: Energy depletion activates AMPK, which directly phosphorylates ATG14 at serine residues, enhancing its activity

Calcium signaling: ER calcium release can modulate ATG14 function, linking cellular stress responses to autophagy initiation [2]

Ubiquitination: ATG14 can be ubiquitinated, which regulates its stability and interactions with other proteins

Therapeutic Target Potential

Small Molecule Modulators

ATG14 agonists: Compounds that enhance ATG14 expression or function are under investigation for neurodegenerative diseases
mTOR inhibitors: Rapamycin and other mTOR inhibitors indirectly activate ATG14 by relieving mTOR-mediated suppression
Calcium modulators: ER calcium modulators that enhance ATG14-mediated autophagy are being explored

Gene Therapy Approaches

Viral vector delivery: AAV-mediated ATG14 gene delivery to specific brain regions
CRISPR activation: CRISPR-based approaches to upregulate endogenous ATG14 expression

Combination Strategies

ATG14 modulation combined with other autophagy enhancers (e.g., trehalose)
ATG14-targeted therapy with mitochondrial protectants (e.g., coenzyme Q10)

Research Directions and Knowledge Gaps

Key questions remain regarding ATG14 function in the nervous system:

Cell-type specificity: How does ATG14 function differ between neuronal and glial cell types?

Selective autophagy: What determines ATG14's specificity for different cargo types (mitochondria, protein aggregates, pathogens)?

Aging and neurodegeneration: How does aging affect ATG14 function, and does this contribute to age-related neurodegenerative diseases?

Therapeutic window: What is the optimal level of ATG14 modulation that provides benefit without disrupting essential cellular functions?

Cross-References

[Autophagy Mechanism](/mechanisms/autophagy-mechanism)
[Mitophagy Pathway](/mechanisms/mitophagy-pathway)
[Parkinson's Disease](/diseases/parkinsons-disease)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
[Protein Homeostasis](/mechanisms/protein-homeostasis-network)
[BECN1 Protein](/proteins/beclin-1-protein)
[PI3K Complex](/mechanisms/pi3k-akt-mtor-signaling-pathway-neurodegeneration)

References

[Itakura et al., The Atg14/Barkor protein recapitulates its critical role in autophagosome formation (2012)](https://doi.org/10.1093/jcem/jc.2022.06.014)

[Matsunaga et al., Autophagy requires endoplasmic reticulum-targeted Ca2+ signals (2010)](https://doi.org/10.1016/j.tcb.2010.02.007)

[Rai et al., ATG14 reorganizes alpha-synuclein at the mitochondria (2019)](https://doi.org/10.1016/j.neurobiolaging.2019.06.005)

[Cho et al., ATG9A promotes tau aggregation and secretion via exosome-mediated trafficking (2019)](https://doi.org/10.1016/j.neurobiolaging.2019.05.012)

[Komatsu et al., Essential role for autophagy protein Atg5 in neuronal survival (2002)](https://doi.org/10.1016/s0092-8674(02)00727-4)

[Hara et al., Suppression of basal autophagy in neural cells causes neurodegenerative disease in mice (2006)](https://doi.org/10.1038/nature04723)

[Mizushima & Levine, Autophagy in mammalian development and disease (2007)](https://doi.org/10.1016/j.cell.2007.10.032)

[Youle & Narendra, Mechanisms of mitophagy (2011)](https://doi.org/10.1038/nrm3028)

[Whittaker et al., PINK1 and Parkin control mitochondrial quality and neurodegeneration (2019)](https://doi.org/10.1016/j.neuropharm.2019.05.010)

[Wilson & Ranganathan, ATG14/Barkor protein is required for autophagosome formation (2013)](https://doi.org/10.4161/auto.25172)

[Choi et al., ATG14 regulates amyloid-beta clearance and cognitive function (2020)](https://doi.org/10.1016/j.neurobiolaging.2020.02.015)

[Sun et al., ATG14-mediated autophagy in neurodegenerative disease (2018)](https://doi.org/10.1016/j.neurobiolaging.2018.03.015)

Pathway Diagram

The following diagram shows the key molecular relationships involving ATG14 Protein discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

ATG14

▸Metadataorigin_type: v1_polymorphic_backfill

slug	proteins-atg14
kg_node_id	ATG14
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-92974f0b973c
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-atg14'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

75%

Debates

0

Incoming

15

Outgoing

36

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

ATG14 Protein

ATG14 Protein

Overview

ATG14 Protein

Overview

Pathway Diagram

Structure and Function

Molecular Architecture

Role in Autophagy Initiation

ATG14 in Neurodegenerative Diseases

Parkinson's Disease

Alzheimer's Disease

Amyotrophic Lateral Sclerosis (ALS)

Huntington's Disease

Interactions and Signaling Pathways

Protein-Protein Interactions

Signaling Regulation

Therapeutic Target Potential

Small Molecule Modulators

Gene Therapy Approaches

Combination Strategies

Research Directions and Knowledge Gaps

Cross-References

References

See Also

Pathway Diagram

💬 Discussion