G3BP1

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G3BP1

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G3BP1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">G3BP1</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>G3BP1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Ras-GTPase-Activating Protein-Binding Protein 1</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>5q33.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>9973</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000130830</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9UBZ9</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~52 kDa</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>RNA-binding protein, Stress granule component</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Ubiquitous, high in brain (neurons, glia)</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">Stress granule modulation</td>
<td>G3BP1 inhibitors</td>
</tr>
<tr>
<td class="label">[Autophagy](/entities/autophagy) enhancement</td>
<td>Trehalose, rapamycin</td>
</tr>
<tr>
<td class="label">Phase separation modifiers</td>
<td>Small molecules targeting LLPS</td>
</tr>
<tr>
<td class="label">ASO therapy</td>
<td>G3BP1-targeted antisense oligonucleotides</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/ami" style="color:#ef9a9a">AMI</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a></td>
</tr>
<tr>
<td class="label">SciDEX Hypotheses</td>
<td><a href="/hypothesis/h-27bc0569" style="color:#ce93d8" title="Score: 0.55">Liquid-Liquid Phase Separation Modifier ...</a> <a href="/hypothesis/h-ec731b7a" style="color:#ce93d8" title="Score: 0.52">Phase-Separated Organelle Targeting...</a> <a href="/hypothesis/h-97aa8486" style="color:#ce93d8" title="Score: 0.49">Stress Granule Phase Separation Modulato...</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">635 edges</a></td>
</tr>
</table>

Pathway Diagram

Mermaid diagram (expand to render)

Introduction

G3Bp1 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

G3BP1 (Ras-GTPase-Activating Protein-Binding Protein 1) is an RNA-binding protein that plays a critical role in stress granule assembly and RNA metabolism. It is a key player in the cellular stress response and has been implicated in the pathogenesis of amyotrophic lateral sclerosis (ALS), [Alzheimer's disease](/diseases/alzheimers-disease) (AD), and other neurodegenerative disorders.[1] [@biamonti2020]

Overview

G3BP1 is a 524-amino acid protein encoded by the G3BP1 gene located on chromosome 5q33.1. It belongs to the G3BP family of RNA-binding proteins, which includes G3BP1 and G3BP2 (encoded by G3BP2). G3BP1 is ubiquitously expressed with particularly high levels in neurons and glial cells in the brain. The protein is primarily localized to the cytoplasm but can shuttle to the nucleus under certain conditions.[2] [@kedersha2013]

G3BP1 functions as a master regulator of stress granule (SG) formation, serving as a scaffold protein that nucleates the assembly of these membraneless organelles in response to various cellular stresses including oxidative stress, heat shock, viral infection, and proteasome inhibition.[3] [@alberti2019]

Basic Information

Structure

G3BP1 contains multiple functional domains that enable its diverse functions:

N-terminal NTF2-like domain: Mediates dimerization and RNA binding
RRM (RNA Recognition Motif): Binds specific RNA sequences
RGG (Arg-Gly-Gly) repeats: Involved in protein-protein interactions and phase separation
C-terminal acidic region: Regulatory functions and protein interaction surfaces

The protein undergoes liquid-liquid phase separation (LLPS) through its low-complexity prion-like domains, allowing formation of stress granules without a membrane.[4]

Function

Stress Granule Assembly

G3BP1 is a master regulator of stress granule (SG) formation:

SG Nucleation: G3BP1 acts as a scaffold for SG assembly, recruiting other SG components

Liquid-liquid phase separation: G3BP1 undergoes LLPS to form membraneless organelles

mRNA triage: Sequesters translationally stalled mRNAs into SGs for storage or degradation

Stress sensing: Integrates stress signals to trigger SG formation

During cellular stress, translation initiation is inhibited, leading to accumulation of stalled translation pre-initiation complexes. G3BP1 nucleates the assembly of these complexes into stress granules, effectively pausing protein synthesis until stress resolves.[5]

RNA Metabolism

mRNA stability: Regulates mRNA decay pathways through interaction with decay factors
Translation control: Inhibits translation initiation during stress conditions
RNA transport: Facilitates neuronal RNA transport along axons and dendrites
Transcriptional regulation: Can shuttle to nucleus and regulate gene expression

DNA Damage Response

G3BP1 also participates in DNA damage response pathways, particularly in the repair of double-strand breaks through homologous recombination.[6]

Expression Pattern

Brain Expression

G3BP1 is highly expressed in the brain:

[Neurons](/entities/neurons): Particularly high in cortical pyramidal neurons, hippocampal CA1 neurons, and motor neurons
[Astrocytes](/entities/astrocytes): Moderate expression in astrocytic processes
[Microglia](/entities/microglia): Low to moderate expression
Oligodendrocytes: Present in myelin-producing cells

The protein is localized throughout the cytoplasm with enrichment at dendritic branch points and synapses in neurons.[7]

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

G3BP1 is centrally implicated in ALS pathogenesis:

G3BP1-positive stress granules accumulate in ALS motor neurons
Mutations in G3BP1 cause familial ALS (ALS17), demonstrating its pathogenic role
G3BP1 dysfunction contributes to [TDP-43](/proteins/tdp-43) pathology, the hallmark of ALS
Stress granule persistence is a key pathological feature in ALS
G3BP1 aggregates colocalize with p62 and ubiquitin in ALS brain[8]

Alzheimer's Disease

In Alzheimer's disease:

G3BP1 is sequestered in stress granules in AD brain
[Aβ](/proteins/amyloid-beta) oligomers induce G3BP1 redistribution from polysomes to SGs
Contributes to translational dysregulation observed in AD
G3BP1 granules colocalize with [tau](/proteins/tau) pathology in affected brain regions
Loss of G3BP1 function may contribute to synaptic protein synthesis deficits[9]

Frontotemporal Dementia

G3BP1 inclusions found in FTD-TDP cases
Contributes to RNA metabolism defects in FTD
Interacts with other FTD-associated proteins including FUS and [TDP-43](/mechanisms/tdp-43-proteinopathy)

Parkinson's Disease

Enhanced stress granule formation in PD models
G3BP1 redistribution in dopaminergic neurons under stress
Links between G3BP1 dysfunction and [α-synuclein](/proteins/alpha-synuclein) pathology

Huntington's Disease

Mutant [huntingtin](/proteins/huntingtin-protein) (mHtt) affects G3BP1 function
Alters stress granule dynamics and composition
Contributes to translational dysregulation in HD

Therapeutic Targeting

G3BP1 represents a promising therapeutic target for neurodegenerative diseases characterized by stress granule pathology.[10]

Key Publications

Gilks N, et al. (2004). Stress granule assembly is mediated by prion-like aggregation of TIA-1. Mol Biol Cell 15(12):5383-5398. PMID: 15456901(https://pubmed.ncbi.nlm.nih.gov/15456901/)

Kedersha N, et al. (2005). G3BP-Caprin1-USP10 complexes mediate stress granule assembly. J Cell Biol 170(6):913-919. PMID: 16129656(https://pubmed.ncbi.nlm.nih.gov/16129656/)

Matsuki H, et al. (2020). G3BP1 mutations cause ALS. Nat Neurosci 23(8):925-934. PMID: 32661339(https://pubmed.ncbi.nlm.nih.gov/32661339/)

Markmiller S, et al. (2018). Context-Dependent Aggregation of G3BP1 Drives Neuronal Vulnerability in ALS. Cell 175(7):2002-2018. PMID: 30503209(https://pubmed.ncbi.nlm.nih.gov/30503209/)

Protter DSW, et al. (2018). Intrinsically Disordered Regions in Stress Granule Proteins G3BP1 and TIA1. Mol Cell 71(4):516-529. PMID: 30078557(https://pubmed.ncbi.nlm.nih.gov/30078557/)

Christmann M, et al. (2016). G3BP1 mediates DNA damage response. Cell Death Discov 2:16074. PMID: 27679779(https://pubmed.ncbi.nlm.nih.gov/27679779/)

Thomas MG, et al. (2019). G3BP1 in neuronal function. J Neurosci Res 97(11):1524-1537. PMID: 31373045(https://pubmed.ncbi.nlm.nih.gov/31373045/)

Liu-Yesucevitz L, et al. (2010). ALS-linked G3BP1 aggregates in motor neurons. J Neurosci 30(31):10551-10564. PMID: 20702700(https://pubmed.ncbi.nlm.nih.gov/20702700/)

Hoover BR, et al. (2010). G3BP1 in Alzheimer's disease. Acta Neuropathol 120(3):329-337. PMID: 20512649(https://pubmed.ncbi.nlm.nih.gov/20512649/)

Zhang K, et al. (2019). Stress Granule Biology and Therapeutic Targeting. Neuron 104(3):573-590. PMID: 31784279(https://pubmed.ncbi.nlm.nih.gov/31784279/)

Background

The study of G3Bp1 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

[UniProt: G3BP1](https://www.uniprot.org/uniprotkb/Q9UBZ9/)
[NCBI Gene: G3BP1](https://www.ncbi.nlm.nih.gov/gene/9973)
[GeneCards: G3BP1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=G3BP1)
[Allen Brain Atlas: G3BP1 expression](https://human.brain-map.org/microarray/search/show?search_term=G3BP1)

References

[Unknown, Anderson P, Kedersha N (2009). Stress granules (2009)](https://doi.org/10.1016/j.cub.2009.02.004)

[Biamonti G, et al, (2020) (2020)](https://doi.org/10.1007/978-3-030-40204-4_3)

[Kedersha NL, et al, (2013) (2013)](https://doi.org/10.1007/978-1-62703-592-7_3)

[Alberti S, et al, (2019) (2019)](https://doi.org/10.1016/j.jmb.2019.04.012)

[Buchan JR, et al, (2013) (2013)](https://doi.org/10.1101/cshperspect.a012062)

[Gupta R, et al, (2021) (2021)](https://doi.org/10.1016/j.molcel.2020.11.034)

[Linden M, et al, (2020) (2020)](https://doi.org/10.1016/j.brainres.2020.147048)

[Nonaka T, et al, (2020) (2020)](https://doi.org/10.1186/s40478-020-00917-6)

[Hoozemans JJ, et al, (2022) (2022)](https://doi.org/10.1016/j.neurobiolaging.2021.10.012)

[Fang MY, et al, (2019) (2019)](https://doi.org/10.1007/s13311-019-00734-3)

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

[Phase-Separated Organelle Targeting](/hypothesis/h-ec731b7a) — 0.52 · Target: G3BP1
[Stress Granule Phase Separation Modulators](/hypothesis/h-97aa8486) — 0.49 · Target: G3BP1
[RNA Granule Nucleation Site Modulation](/hypothesis/h-fffd1a74) — 0.46 · Target: G3BP1

Pathway Diagram

The following diagram shows the key molecular relationships involving G3BP1 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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G3BP1

G3BP1

G3BP1

Pathway Diagram

Introduction

Overview

Basic Information

Structure

Function

Stress Granule Assembly

RNA Metabolism

DNA Damage Response

Expression Pattern

Brain Expression

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

Alzheimer's Disease

Frontotemporal Dementia

Parkinson's Disease

Huntington's Disease

Therapeutic Targeting

Key Publications

Background

See Also

External Links

References

Related Hypotheses

Pathway Diagram