G3BP2 Gene
Introduction
G3Bp2 Ras Gtpase Activating Protein Binding Protein 2 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
flowchart TD
G3BP2["G3BP2"] -->|"interacts with"| Cancer["Cancer"]
G3BP2["G3BP2"] -->|"interacts with"| Als["Als"]
G3BP2["G3BP2"] -->|"interacts with"| Tumor["Tumor"]
G3BP2["G3BP2"] -->|"associated with"| Cancer["Cancer"]
G3BP2["G3BP2"] -->|"associated with"| Als["Als"]
G3BP2["G3BP2"] -->|"expressed in"| Cancer["Cancer"]
G3BP2["G3BP2"] -->|"expressed in"| Atherosclerosis["Atherosclerosis"]
G3BP2["G3BP2"] -->|"expressed in"| Cardiac["Cardiac"]
G3BP2["G3BP2"] -->|"expressed in"| Tumor["Tumor"]
G3BP2["G3BP2"] -->|"activates"| Als["Als"]
G3BP2["G3BP2"] -->|"activates"| RNA["RNA"]
G3BP2["G3BP2"] -->|"activates"| G3BP1["G3BP1"]
G3BP2["G3BP2"] -->|"inhibits"| G3BP1["G3BP1"]
G3BP2["G3BP2"] -->|"associated with"| G3BP1["G3BP1"]
style G3BP2 fill:#4fc3f7,stroke:#333,color:#000
G3BP2 (Ras-GTPase-Activating Protein-Binding Protein 2) is an RNA-binding protein that functions as a stress granule assembly factor. It is encoded by the G3BP2 gene located on chromosome 4p16.3 and plays important roles in RNA metabolism, stress response, and neuronal function. G3BP2 is a member of the G3BP family, which includes G3BP1 and G3BP2, both involved in stress granule biology and RNA regulation. [@boeynaems2017]
...G3BP2 Gene
Introduction
G3Bp2 Ras Gtpase Activating Protein Binding Protein 2 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
Mermaid diagram (expand to render)
G3BP2 (Ras-GTPase-Activating Protein-Binding Protein 2) is an RNA-binding protein that functions as a stress granule assembly factor. It is encoded by the G3BP2 gene located on chromosome 4p16.3 and plays important roles in RNA metabolism, stress response, and neuronal function. G3BP2 is a member of the G3BP family, which includes G3BP1 and G3BP2, both involved in stress granule biology and RNA regulation. [@boeynaems2017]
<div class="infobox infobox-gene"> [@wolozin2012]
<table> [@mateju2017]
<tr><th colspan="2" style="background:#f0f0f0;">G3BP2</th></tr> [@aulas2017]
<tr><td><strong>Gene Symbol</strong></td><td>G3BP2</td></tr> [@protter2016]
<tr><td><strong>Full Name</strong></td><td>Ras-GTPase-Activating Protein-Binding Protein 2</td></tr>
<tr><td><strong>Chromosome</strong></td><td>4p16.3</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[9908](https://www.ncbi.nlm.nih.gov/gene/9908)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[608189](https://www.omim.org/entry/608189)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>[ENSG00000138798](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000138798)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9UWR1](https://www.uniprot.org/uniprot/Q9UWR1)</td></tr>
<tr><td><strong>Protein Length</strong></td><td>523 amino acids</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>56 kDa</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/cardiac" style="color:#ef9a9a">Cardiac</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">16 edges</a></td>
</tr>
</table>
</div>
Protein Structure
G3BP2 contains multiple functional domains:
- RRM Domains (RNA Recognition Motifs): Two RRM domains (RRM1 and RRM2) for RNA binding
- RG-rich Region: Arginine-glycine rich region for protein-protein interactions
- NTF2-like Domain: Mediates homodimerization and stress granule targeting
- C-terminal Domain: Contains the acidic region and phenylalanine-glycine (FG) repeats
Molecular Function
Stress Granules
G3BP2 is a core component of stress granules (SGs):
- SG Nucleation: Acts as a primary scaffold for SG assembly, recruiting other SG proteins
- RNA Binding: Binds to mRNA through multiple RRM domains, sequestering transcripts during stress
- Translation Regulation: Temporarily halts translation by sequestering translation initiation factors and mRNAs
- Liquid-Liquid Phase Separation: G3BP2 undergoes phase separation to form biomolecular condensates
Signaling Pathways
G3BP2 interacts with multiple signaling pathways:
- Ras Signaling: Interacts with Ras-GAP (Ras GTPase-activating protein), modulating Ras pathway activity
- [NF-κB](/entities/nf-kb) Signaling: Involved in inflammatory response regulation through TRAF6 interactions
- p53 Pathway: Modulates p53-mediated transcription and stress response
- cGAS-[STING](/cgas-sting-pathway-in-neurodegeneration): Involved in innate immune response to viral infections
Post-translational Modifications
- Phosphorylation: Multiple serine/threonine phosphorylation sites regulate SG assembly
- Methylation: Arginine methylation affects RNA binding properties
- Ubiquitination: Regulates protein stability and interactions
Function in Neurodegeneration
Alzheimer's Disease
In AD, G3BP2 plays significant roles:
- Stress Granule Formation: Persistent SGs in AD brain contribute to proteostatic stress
- RNA Metabolism Dysregulation: Altered mRNA translation and turnover
- [Tau](/proteins/tau) Pathology: G3BP2 found in [tau](/proteins/tau) inclusions and neurofibrillary tangles
- [Aβ](/proteins/amyloid-beta) Effects: Amyloid-beta oligomers induce G3BP2 redistribution to SGs
- Neuroinflammation: G3BP2 modulates inflammatory responses in [microglia](/entities/microglia)
ALS/FTD
G3BP2 is critically implicated in ALS/FTD:
- Stress Granule Pathology: Dysregulated SG dynamics are a hallmark of ALS
- [TDP-43](/proteins/tdp-43) Aggregation: G3BP2 interacts with [TDP-43](/mechanisms/tdp-43-proteinopathy), found in ALS/FTD inclusions
- [C9orf72](/entities/c9orf72) Repeats: G3BP2 binds to expanded GGGGCC RNA repeats, forming toxic RNA foci
- Dipeptide Repeat Proteins: G3BP2 sequestered in DPR protein aggregates
- FUS Interactions: G3BP2 associates with FUS protein in stress granules
Parkinson's Disease
- Altered stress granule formation in dopaminergic [neurons](/entities/neurons)
- RNA metabolism impairment affecting mitochondrial function
- [Alpha-synuclein](/proteins/alpha-synuclein) interaction with G3BP2
- Possible role in [LRRK2](/entities/lrrk2)-associated pathology
Huntington's Disease
- Mutant [huntingtin](/proteins/huntingtin-protein) sequesters G3BP2 into aggregates
- Disrupted stress granule dynamics
- Impaired stress response in neurons
Therapeutic Targeting
| Approach | Mechanism | Development Stage |
|----------|-----------|-------------------|
| SG Modulators | Dissolve pathological SGs, promote clearance | Research |
| RNA-binding Inhibitors | Block G3BP2-RNA interactions | Research |
| Anti-aggregates | Prevent protein aggregation, enhance clearance | Preclinical |
| Phase Separation Modulators | Target LLPS dysregulation | Early Research |
Disease Associations
| Disease | Role | Evidence |
|---------|------|----------|
| Alzheimer's Disease | Stress granules, [tau](/proteins/tau) pathology | G3BP2 in AD brain inclusions |
| ALS/FTD | SG pathology, TDP-43, C9orf72 | G3BP2 dysfunction in models |
| [Parkinson's Disease](/diseases/parkinsons-disease-disease) | RNA metabolism, α-synuclein | Altered expression in PD |
| Huntington's Disease | mHTT aggregation | G3BP2 sequestration |
Expression in the Brain
G3BP2 is widely expressed in neurons throughout the CNS:
| Brain Region | Expression Level | Cell Type Specificity |
|--------------|-----------------|---------------------|
| Cerebral [Cortex](/brain-regions/cortex) | High | Pyramidal neurons, interneurons |
| [Hippocampus](/brain-regions/hippocampus) | High | CA1-CA3 pyramidal cells, dentate granule cells |
| Cerebellum | High | Purkinje cells, granule cells |
| Basal Ganglia | Moderate | Medium spiny neurons |
| Brainstem | Moderate | Various neuron populations |
| Substantia Nigra | Moderate | Dopaminergic neurons |
Animal Models
- G3bp2 knockout mice: Viable but show enhanced stress sensitivity
- Conditional knockout: Neuron-specific deletion leads to behavioral deficits
- ALS models: G3BP2 redistribution in motor neurons with TDP-43 pathology
Key Publications
Vanderweyde T, et al. (2016). Stress granule assembly and disassembly in neurodegenerative disease. J Mol Neurosci. PMID: 27039847(https://pubmed.ncbi.nlm.nih.gov/27039847/)
Boeynaems S, et al. (2017). Phase separation of C9orf72 dipeptide repeats modulates stress granule dynamics. Mol Cell. PMID: 28157508(https://pubmed.ncbi.nlm.nih.gov/28157508/)
Maharjan N, et al. (2017). Monitoring stress granule formation in Drosophila and mammalian neurons. Methods Mol Biol.
Reinecke JB, et al. (2011). The RasGAPSH3 domain-like protein G3BP1. Cell Signal.See Also
- [RNA Metabolism Dysregulation Pathway](/mechanisms/rna-metabolism-dysregulation)
- [Stress Granules](/mechanisms/stress-granules)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [ALS](/diseases/als)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [FTD](/diseases/ftd)
- [G3BP1 Gene](/proteins/g3bp1-protein)
- [TDP-43](/proteins/tardbp-protein)
External Links
- [NCBI Gene: G3BP2](https://www.ncbi.nlm.nih.gov/gene/9908)
- [UniProt: G3BP2](https://www.uniprot.org/uniprot/Q9UWR1)
- [Ensembl: G3BP2](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000138798)
- [Human Protein Atlas: G3BP2](https://www.proteinatlas.org/ENSG00000138798-G3BP2)
Background
The study of G3Bp2 Ras Gtpase Activating Protein Binding Protein 2 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
[Vanderweyde T, et al, (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27039847/)
[Boeynaems S, et al, (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28157508/)
Wolozin B, et al, (2012) (2012)
Mateju D, et al, (2017) (2017)
Aulas A, et al, (2017) (2017)
Unknown, Protter DSW, Parker R (2016). Principles and properties of stress granules (2016)Pathway Diagram
The following diagram shows the key molecular relationships involving G3BP2 - Ras-GTPase-Activating Protein-Binding Protein 2 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)