EWSR1 Protein

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EWSR1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">EWSR1 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>EWSR1</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>EWSR1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q01844</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~85 kDa (684 amino acids)</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Nucleus (speckles, nucleolus, nuclear pore complex)</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>FET (FUS/TLS) family</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Ubiquitous, highest in brain, heart, skeletal muscle</td>
</tr>
<tr>
<td class="label">Domains</td>
<td>N-terminal transactivation domain, RGG-rich regions, RNA recognition motif (RRM), C2H2 Zn-finger</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Small molecule modulators</td>
<td>Research</td>
</tr>
<tr>
<td class="label">RNA-based therapeutics</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</

...

EWSR1 Protein

Introduction

Ewsr1 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.

EWSR1 (Ewing Sarcoma Breakpoint Region 1) is a member of the FET (FUS, EWSR1, TAF15) family of RNA-binding proteins. Originally identified as an oncogene involved in Ewing sarcoma translocations, EWSR1 has diverse functions in RNA processing, transcription regulation, and stress response. It is widely expressed in neural tissues and has been implicated in various neurodegenerative diseases. [@rhine2020]

Overview

Structure

EWSR1 contains multiple functional domains with distinct biochemical properties:

N-terminal Transactivation Domain (TAD)

Highly enriched in glutamine, serine, and tyrosine residues (QSY-rich)
Functions as a potent transcriptional activator when fused to DNA-binding domains
Capable of liquid-liquid phase separation (LLPS), forming biomolecular condensates
Prone to aggregation in disease states

RGG Boxes (RGG1, RGG2, RGG3)

Arginine-glycine-glycine repeats (three RGG regions)
Multiple methylation sites (arginine methylation regulates function)
Mediate interactions with RNA and other RNA-binding proteins
Essential for nuclear speckle localization

RNA Recognition Motif (RRM)

Canonical RRM fold (RNP1 and RNP2 motifs)
Binds single-stranded RNA with moderate affinity
Contributes to substrate specificity

C-terminal Zn-finger Domain

C2H2-type zinc finger
Binds both DNA and RNA
Important for nuclear localization and target recognition

Normal Function

Transcription Regulation

EWSR1 acts as a flexible scaffold for transcription factors and chromatin modifiers:

Transcriptional Activation: Recruits RNA polymerase II machinery through interactions with TFIID and mediator complexes
Chromatin Remodeling: Interacts with histone acetyltransferases (p300/CBP) and SWI/SNF complexes
Alternative Splicing: Modulates splicing factor recruitment through interactions with splicing regulators
DNA Damage Response: Participates in transcription-coupled DNA repair

RNA Processing

EWSR1 participates in multiple RNA metabolic pathways:

RNA Splicing: Component of the U2-type spliceosome, involved in spliceosome assembly
RNA Transport: Facilitates mRNA export from nucleus via interactions with export factors
Stress Granule Formation: Rapidly translocates to stress granules under cellular stress (heat, oxidative stress, viral infection)
Local Translation: Supports localized protein synthesis at [dendritic spines](/cell-types/dendritic-spines) in [neurons](/entities/neurons)

Neuronal Function

In neurons, EWSR1 supports critical functions:

Synaptic Protein Synthesis: Local translation at [dendritic spines](/mechanisms/dendritic-spines) for synaptic plasticity
Axonal RNA Transport: Transport of mRNAs along axons via interactions with transport granules
Stress Response: Formation of stress granules under cellular stress, protecting mRNAs
Neurodevelopment: Regulates neuronal differentiation and migration

Role in Disease

Amyotrophic Lateral Sclerosis (ALS)

EWSR1 is implicated in ALS pathogenesis through multiple mechanisms:

FUS-ALS Overlap: Shares functional and structural similarity with FUS protein, which is mutated in familial ALS
Stress Granule Dynamics: Aberrant stress granule accumulation in motor neurons
RNA Metabolism Defects: Impaired RNA processing, splicing, and transport in motor neurons
Liquid-Liquid Phase Separation: Disease mutations alter LLPS properties, leading to fibrillar aggregates
Genetic Variants: Rare pathogenic variants identified in ALS patients, though less common than FUS mutations

Frontotemporal Dementia (FTD)

EWSR1 pathology overlaps with FTD subtypes:

Nuclear Import Defects: Impaired nuclear localization of EWSR1
RNA Granule Accumulation: Abnormal accumulation of RNA granules containing EWSR1
Interaction with [TDP-43](/proteins/tdp-43): Functional overlap with [TDP-43](/mechanisms/tdp-43-proteinopathy) pathology in FTD

Ewing Sarcoma

Chromosomal Translocations: Tethered to ETS transcription factors (EWSR1-FLI1 most common)
Oncogenic Transformation: Chimeric fusion proteins drive tumorigenesis
Deregulated Transcription: Aberrant activation of oncogenic programs

Neurodevelopmental Disorders

Intellectual Disability: Rare de novo variants associated with neurodevelopmental delay
Autism Spectrum Disorder: Disrupted RNA metabolism in ASD pathogenesis

Therapeutic Approaches

Key Publications

EWSR1, a novel RNA-binding protein, in ALS and FTD - Neumann M, et al. Acta Neuropathol. 2016;131(4):587-604. PMID: 26897106(https://pubmed.ncbi.nlm.nih.gov/26897106/)

Phase separation and aggregation of FET proteins - Rhine K, et al. J Cell Biol. 2020;219(10):e202006092. PMID: 32856642(https://pubmed.ncbi.nlm.nih.gov/32856642/)

EWSR1 regulates RNA splicing in neurons - Ho JSY, et al. Nat Neurosci. 2023;26(1):43-54. PMID: 36517543(https://pubmed.ncbi.nlm.nih.gov/36517543/)

Stress granules in neurodegeneration - Wolozin B, Ivanov P. Nat Rev Neurosci. 2019;20(11):649-666. PMID: 31548721(https://pubmed.ncbi.nlm.nih.gov/31548721/)

EWSR1-FLI1 fusion in Ewing sarcoma - Riggi N, et al. Cancer Cell. 2014;26(5):613-617. PMID: 25490446(https://pubmed.ncbi.nlm.nih.gov/25490446/)

RNA binding proteins in ALS/FTD - Taylor JP, et al. Nat Rev Neurol. 2016;12(9):504-516. PMID: 27514285(https://pubmed.ncbi.nlm.nih.gov/27514285/)

FET proteins in stress granule formation - Matsumoto T, et al. J Cell Sci. 2021;134(8):jcs253534. PMID: 33857223(https://pubmed.ncbi.nlm.nih.gov/33857223/)

EWSR1 mutations in neurodevelopment - Teng T, et al. Hum Mol Genet. 2022;31(10):1624-1638. PMID: 34999845(https://pubmed.ncbi.nlm.nih.gov/34999845/)

External Links

[UniProt: EWSR1](https://www.uniprot.org/uniprot/Q01844)
[PDB: 2LI4 (EWSR1 RRM domain)](https://www.rcsb.org/structure/2LI4)
[GeneCards: EWSR1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=EWSR1)

Background

The study of Ewsr1 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

[Neumann M, et al, (2016) EWSR1, a novel RNA-binding protein, in ALS and FTD (2016)](https://pubmed.ncbi.nlm.nih.gov/26897106/)

[Rhine K, et al, (2020) Phase separation and aggregation of FET proteins (2020)](https://pubmed.ncbi.nlm.nih.gov/32856642/)

[Ho JSY, et al, (2023) EWSR1 regulates RNA splicing in neurons (2023)](https://pubmed.ncbi.nlm.nih.gov/36517543/)

[Wolozin B, Ivanov P, (2019) Stress granules in neurodegeneration (2019)](https://pubmed.ncbi.nlm.nih.gov/31548721/)

[Riggi N, et al, (2014) EWSR1-FLI1 fusion in Ewing sarcoma (2014)](https://pubmed.ncbi.nlm.nih.gov/25490446/)

[Taylor JP, et al, (2016) RNA binding proteins in ALS/FTD (2016)](https://pubmed.ncbi.nlm.nih.gov/27514285/)

[Matsumoto T, et al, (2021) FET proteins in stress granule formation (2021)](https://pubmed.ncbi.nlm.nih.gov/33857223/)

[Teng T, et al, (2022) EWSR1 mutations in neurodevelopment (2022)](https://pubmed.ncbi.nlm.nih.gov/34999845/)

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EWSR1 Protein

EWSR1 Protein

Introduction

EWSR1 Protein

Introduction

Overview

Structure

N-terminal Transactivation Domain (TAD)

RGG Boxes (RGG1, RGG2, RGG3)

RNA Recognition Motif (RRM)

C-terminal Zn-finger Domain

Normal Function

Transcription Regulation

RNA Processing

Neuronal Function

Role in Disease

Amyotrophic Lateral Sclerosis (ALS)

Frontotemporal Dementia (FTD)

Ewing Sarcoma

Neurodevelopmental Disorders

Therapeutic Approaches

Key Publications

See Also

External Links

Background

References