MAP1LC3A Protein
Overview
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">MAP1LC3A Protein</th>
</tr>
<tr>
<td class="label">Protein Symbol</td>
<td>MAP1LC3A (LC3A)</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Microtubule-Associated Protein 1 Light Chain 3 Alpha</td>
</tr>
<tr>
<td class="label">NCBI Protein ID</td>
<td>NP_115903.1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9Y9P3</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>14.5 kDa</td>
</tr>
<tr>
<td class="label">Amino Acids</td>
<td>121</td>
</tr>
<tr>
<td class="label">Form</td>
<td>Modification</td>
</tr>
<tr>
<td class="label">Pro-LC3</td>
<td>Full-length</td>
</tr>
<tr>
<td class="label">LC3-I</td>
<td>Cytosolic</td>
</tr>
<tr>
<td class="label">LC3-II</td>
<td>Phosphatidylethanolamine</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">[Neurons](/entities/neurons)</td>
<td>High</td>
</tr>
<tr>
<td class="label">[Astrocytes](/entities/astrocytes)</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">[Microglia](/entities/microglia)</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Oligodendrocytes</td>
<td>Low</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/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">357 edges</a></td>
</tr>
</table>
Map1Lc3A Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
Introduction
Map1Lc3A 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. [@mizushima2011]
The MAP1LC3A gene (Microtubule-Associated Protein 1 Light Chain 3 Alpha) encodes a core protein of the autophagy machinery. LC3 is essential for autophagosome formation and is widely used as a marker for autophagy activity in neurodegenerative diseases. [@klionsky2016]
Protein Overview
Normal Function
LC3A is a fundamental autophagy protein:
- Autophagosome formation: Core structural component
- Cargo recognition: Binds autophagy receptors via LIR motif
- Membrane recruitment: Facilitates ATG protein recruitment
- Fusion machinery: Involved in lysosome fusion
- Neuronal function: Synaptic vesicle cycling
Molecular Mechanism
LC3 undergoes processing:
The conversion of LC3-I to LC3-II via phosphatidylethanolamine conjugation is essential for autophagy.
LIR Motif Interactions
LC3 recognizes cargo via LIR (LC3-Interacting Region) motifs:
- p62/SQSTM1: Selective autophagy
- NBR1: Protein aggregates
- OPTN: Mitophagy receptor
- TBK1: [Autophagy](/entities/autophagy) regulation
Structural Features
Key structural elements:
- N-terminal ubiquitin-like domain
- LIR motif (positions 13-36)
- Phospholipid-binding site
- Dimerization interface
Brain Expression
LC3A expression in brain cell types:
Disease Associations
Alzheimer's Disease
- LC3 accumulation in AD brains
- Impaired autophagic flux
- Colocalizes with [Aβ](/proteins/amyloid-beta) plaques
- Therapeutic: Enhance autophagy
Parkinson's Disease
- LC3 and [α-synuclein](/proteins/alpha-synuclein) colocalization
- Mitophagy defects
- Therapeutic target
- Biomarker potential
ALS
- Motor neuron LC3 aggregates
- Autophagy impairment
- Therapeutic: Autophagy enhancers
Huntington's Disease
- Mutant [huntingtin](/proteins/huntingtin-protein) interactions
- Autophagy blockade
- Therapeutic potential
Therapeutic Implications
LC3-targeted therapeutic strategies:
Autophagy enhancers: Increase LC3-II formation
Small molecule activators: [mTOR](/entities/mtor) inhibitors, AMPK activators
Gene therapy: LC3 overexpression
Monitoring tools: LC3 as biomarkerChallenges:
- Balancing autophagy vs. non-selective degradation
- Cell-type specificity
- Delivery to CNS
Animal Models
Key findings from models:
- LC3A knockout mice: Viable, behavioral deficits
- Autophagy reporters: GFP-LC3 mice
- AD models: LC3-Aβ interactions
- PD models: Mitophagy studies
Research Directions
Current research focus:
Live imaging: Real-time autophagosome tracking
Crispr screens: LC3-interacting proteins
Biomarkers: LC3 in CSF/blood
Therapeutics: Autophagy modulatorsSee Also
- [MAP1LC3A Gene](/proteins/map1lc3a-protein)
- [Autophagy-Lysosomal Pathway](/mechanisms/autophagy-lysosomal-pathway)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [LC3B](/proteins/map1lc3b-protein)
External Links
- [UniProt: MAP1LC3A](https://www.uniprot.org/uniprot/Q9Y9P3)
- [NCBI: MAP1LC3A](https://www.ncbi.nlm.nih.gov/gene/64532)
- [GeneCards: MAP1LC3A](https://www.genecards.org/cgi-bin/carddisp.pl?gene=MAP1LC3A)
Overview
Map1Lc3A Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
Background
The study of Map1Lc3A 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
[Kabeya Y, et al, LC3, a mammalian homolog of yeast Apg8p, is localized in autophagosome membranes (2000)](https://pubmed.ncbi.nlm.nih.gov/11082042/)
[Mizushima N, et al, Autophagy exploits life-or-death decisions (2011)](https://pubmed.ncbi.nlm.nih.gov/21193863/)
[Klionsky DJ, et al, Guidelines for the use and interpretation of assays for monitoring autophagy (2016)](https://pubmed.ncbi.nlm.nih.gov/26799652/)
[Lee Y, et al, Autophagy in Alzheimer's disease (2021)](https://pubmed.ncbi.nlm.nih.gov/32818577/)