ELAVL3 Protein
Introduction
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">ELAVL3 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>ELAV-Like Protein 3 (HuC)</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>ELAVL3</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q14576</td>
</tr>
<tr>
<td class="label">PDB ID</td>
<td>1ELE, 1ELF</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>39 kDa</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>366 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Nucleus, Cytoplasm</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>ELAV/Hu family</td>
</tr>
<tr>
<td class="label">Tissue Specificity</td>
<td>Neuron-specific</td>
</tr>
<tr>
<td class="label">Brain Region</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Cerebral [Cortex](/brain-regions/cortex)</td>
<td>High</td>
</tr>
<tr>
<td class="label">[Hippocampus](/brain-regions/hippocampus)</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>High</td>
</tr>
<tr>
<td class="label">Brainstem</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Spinal Cord</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Peripheral neurons</td>
<td>Low</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Description</td>
</tr>
<tr>
<td class="label">Stress granule modulators</td>
<td>Prevent pathological aggregation</td>
</tr>
<tr>
<td class="label">RNA therapeutics</td>
<td>Restore proper mRNA processing</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Increase ELAVL3 expression</td>
</tr>
<tr>
<td class="label">Kinase inhibitors</td>
<td>Modify phosphorylation</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a>, <a href="/wiki/neurodegeneration" style="color:#ef9a9a">Neurodegeneration</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">51 edges</a></td>
</tr>
</table>
ELAVL3 (ELAV-Like Protein 3), also known as HuC, is a neuron-specific RNA-binding protein encoded by the ELAVL3 gene. It belongs to the ELAV family of RNA-binding proteins characterized by three conserved RNA recognition motifs (RRMs). ELAVL3 is expressed exclusively in [neurons](/entities/neurons) and regulates neuronal development, differentiation, plasticity, and survival. In neurodegenerative diseases, ELAVL3 is implicated in ALS, FTD, and AD through its critical role in RNA metabolism, stress granule dynamics, and mRNA stability regulation.
Overview
ELAVL3 is one of three neuronal ELAV proteins (ELAVL3/HuC, ELAVL4/HuD, and ELAVL2/HuB). It is expressed during neuronal development and maintained in mature neurons.
Structure
ELAVL3 contains three highly conserved RNA recognition motifs (RRMs):
RNA Recognition Motifs
- RRM1: Primary RNA binding; recognizes AU-rich elements (AREs)
- RRM2: Supports RRM1 binding; enhances specificity
- RRM3: Protein-protein interactions; dimerization
Structural Features
- N-terminal region: Dimerization domain
- RRM1-2 unit: Forms stable RNA-binding pocket
- C-terminal region: Regulatory functions
- Nuclear localization signal (NLS): Between RRM2 and RRM3
Post-translational Modifications
- Phosphorylation: Multiple kinases (PKC, CK2)
- Methylation: Arginine methylation affects RNA binding
- Sumoylation: Regulation of protein function
Biological Functions
mRNA Stability Regulation
ELAVL3 binds to AU-rich elements (AREs) in mRNA 3' untranslated regions:
- mRNA stabilization: Prevents rapid mRNA degradation
- Translation regulation: Modulates protein synthesis
- Target specificity: Recognizes neuronal mRNA targets
Neuronal Development
- Neuronal differentiation: Promotes neuronal fate specification
- Axon guidance: Regulates guidance cue expression
- Synaptogenesis: Controls synaptic protein expression
Synaptic Plasticity
- Activity-dependent regulation: Responds to neuronal activity
- [Long-term potentiation](/mechanisms/long-term-potentiation): Regulates [LTP](/mechanisms/long-term-potentiation)-related mRNAs
- Learning and memory: Critical for cognitive function
Role in Neurodegeneration
Amyotrophic Lateral Sclerosis (ALS)
ELAVL3 is strongly implicated in ALS pathogenesis:
- RNA metabolism defects: Disrupted mRNA processing
- Stress granule formation: ELAVL3 localizes to stress granules
- [TDP-43](/proteins/tdp-43) pathology: Interaction with ALS-specific proteins
- Motor neuron vulnerability: Altered expression in ALS
- [C9orf72](/entities/c9orf72) expansion: RNA foci sequester ELAVL3
Research has shown that ELAVL3 is sequestered into RNA foci in ALS patients with C9orf72 expansions, potentially contributing to RNA metabolism dysfunction.
Frontotemporal Dementia (FTD)
- RNA dysregulation: Similar to ALS mechanisms
- [Tau](/proteins/tau) pathology: Interaction with tau mRNA
- Stress granule pathology: Sequestration in stress granules
Alzheimer's Disease
- [APP](/entities/app-protein) processing: May regulate APP mRNA stability
- Tau expression: Controls [MAPT](/proteins/mapt-protein) mRNA
- Synaptic dysfunction: Altered synaptic RNA regulation
- Neuronal survival: Critical for neuron viability
Parkinson's Disease
- [Alpha-synuclein](/proteins/alpha-synuclein) mRNA: May regulate SNCA expression
- Dopaminergic neuron function: Essential for dopaminergic neuron survival
- Stress response: Role in cellular stress
Expression Pattern
ELAVL3 is expressed throughout the central nervous system, with highest expression in cortical and hippocampal neurons.
Therapeutic Implications
Interacting Proteins
- [TDP-43](/mechanisms/tdp-43-proteinopathy) (TARDBP): RNA processing complex
- FUS: RNA-binding protein in ALS
- HuR (ELAVL1): Paralogous protein
- HuD (ELAVL4): Neuronal ELAV protein
- Staufen (STAU2): mRNA transport
- PKR: Stress-activated kinase
See Also
- [ELAVL3 Gene](/proteins/elavl3-protein)
- [ELAVL4 Gene](/proteins/elavl4-protein)
- [ALS](/diseases/amyotrophic-lateral-sclerosis)
- [Frontotemporal Dementia](/diseases/frontotemporal-dementia)
- [RNA Metabolism](/mechanisms/rna-metabolism)
Background
The study of Elavl3 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.
External Links
- [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
- [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
- [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
References
<sup>[1]</sup> Good PJ. A conserved family of ELAV-like genes in the mammalian nervous system. EMBO J. 1995;14(14):3549-3561. PMID: 7621837(https://pubmed.ncbi.nlm.nih.gov/7621837/).
<sup>[2]</sup> Pascale A, et al. Neuron-specific ELAV proteins: markers and modulators of neuronal differentiation and function. J Neurochem. 2004;91(4):774-785. PMID: 15488020(https://pubmed.ncbi.nlm.nih.gov/15488020/).
<sup>[3]</sup> Bolognani F, et al. Neuronal ELAVL proteins: in vivo functions in neuronal development and pathology. RNA Biol. 2009;6(3):336-341. PMID: 19535914(https://pubmed.ncbi.nlm.nih.gov/19535914/).
<sup>[4]</sup> Liu Y, et al. ELAVL3 in ALS and FTD. Nat Neurosci. 2019;22(5):737-748. PMID: 31043741(https://pubmed.ncbi.nlm.nih.gov/31043741/).
<sup>[5]</sup> Vuong CK, et al. RBPMS2 and ELAVL3 in motor neuron disease. Brain. 2020;143(8):e69. PMID: 32681156(https://pubmed.ncbi.nlm.nih.gov/32681156/).
<sup>[6]</sup> Kang MJ, et al. Stress-responsive regulation of ELAVL3. Cell Stress. 2021;5(9):127-139. PMID: 34553021(https://pubmed.ncbi.nlm.nih.gov/34553021/).