MATR3 Protein

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MATR3 Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">MATR3 Protein — Matrin 3</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Matrin 3</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[MATR3](/genes/matr3)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P43243" target="_blank">P43243</a></td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>125 kDa</td>
</tr>
<tr>
<td class="label">Length</td>
<td>847 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Nuclear matrix, Nuclear speckles</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Matrin family (RNA-binding proteins)</td>
</tr>
<tr>
<td class="label">Brain Expression</td>
<td>Motor [cortex](/brain-regions/cortex), Spinal cord, [Hippocampus](/brain-regions/hippocampus), Cerebellum</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/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/dementia" style="color:#ef9a9a">Dementia</a>, <a href="/wiki/frontotemporal-dementia" style="color:#ef9a9a">Frontotemporal Dementia</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">75 edges</a></td>
</tr>
</table>

...

MATR3 Protein

MATR3 Protein — Matrin 3

Introduction

Matr3 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.

Overview

MATR3 (Matrin 3) is a large nuclear matrix protein involved in multiple aspects of RNA processing, DNA repair, and nuclear architecture maintenance.[@johnson2013] MATR3 contains multiple RNA recognition motifs (RRMs) and localizes to the nuclear matrix, where it participates in nuclear organization and gene expression regulation. Mutations in MATR3 cause familial amyotrophic lateral sclerosis (ALS) and distal myopathy with vocal cord paralysis (DM2/VCPD), linking this protein to neurodegeneration.[@senderek2015]

Protein Structure

Domain Architecture

MATR3 is a 125 kDa protein with multiple functional domains:

N-terminal domain: Contains multiple RG-rich (RGG) repeats involved in RNA binding and phase separation
RNA Recognition Motifs (RRMs): Two RRMs (RRM1 and RRM2) for RNA and DNA binding
Nuclear Localization Signals (NLS): Two NLS sequences for nuclear import
C-terminal domain: Mediates protein-protein interactions and dimerization

The protein forms homodimers and can also heterodimerize with related nuclear matrix proteins.[@krecic2001]

Post-translational Modifications

MATR3 is subject to multiple post-translational modifications:

Phosphorylation: Casein kinase 2 (CK2) phosphorylation modulates its RNA binding
Sumoylation: SUMO conjugation affects nuclear distribution
Acetylation: Lysine acetylation influences protein-protein interactions
Methylation: Arginine methylation regulates RNA binding affinity

Normal Cellular Functions

RNA Processing

MATR3 participates in multiple RNA processing steps:

Splicing: Component of the spliceosome; regulates alternative splicing
RNA stability: Binds to AU-rich elements (AREs) to regulate mRNA decay
RNA export: Facilitates nuclear export of specific mRNAs
Non-coding RNA processing: Involved in miRNA and lncRNA processing

DNA Repair

MATR3 has established roles in DNA damage response:

Double-strand break repair: Localizes to DNA damage sites
Transcription-coupled repair: Couples transcription to DNA repair
Telomere maintenance: Associates with shelterin complex proteins

Nuclear Architecture

As a nuclear matrix protein, MATR3 contributes to:

Nuclear scaffold formation: Provides structural framework
Chromatin organization: Regulates chromatin domains
Nuclear pore interaction: Associates with nuclear pore complexes
Phase separation: Forms membraneless organelles via liquid-liquid phase separation

Stress Response

MATR3 is involved in stress response pathways:

Stress granules: Associates with stress granules under translational arrest
Nuclear speckles: Colocalizes with splicing factors in speckles
DNA damage response: Participates in ATM/ATR signaling

Role in Neurodegenerative Diseases

Amyotrophic Lateral Sclerosis (ALS)

MATR3 is genetically and mechanistically linked to ALS:

Genetic Evidence:

Dominant mutations in MATR3 cause familial ALS (FALS)[@johnson2013]
Mutations include p.S85C, p.F115C, p.P154S, and others
Estimated 1-2% of FALS cases harbor MATR3 mutations

Molecular Mechanisms:

RNA processing defects: Mutant MATR3 disrupts normal RNA splicing patterns
Stress granule dysfunction: Altered stress granule dynamics in ALS[@tsoi2018]
Nuclear import defects: Some mutations impair nuclear localization
Loss of function: Haploinsufficiency may contribute to disease

[TDP-43](/mechanisms/tdp-43-proteinopathy) Interaction:

MATR3 interacts with TDP-43 (TARDBP)
Both proteins aggregate in ALS motor [neurons](/entities/neurons)
Shared pathophysiology in RNA metabolism

Frontotemporal Dementia (FTD)

MATR3 connections to FTD:

MATR3 inclusions found in some FTD cases
Overlap with ALS-FTD spectrum disorders
RNA dysregulation in FTD involves MATR3

Parkinson's Disease (PD)

Emerging evidence links MATR3 to PD:

MATR3 expression altered in PD brain tissue
Possible role in [α-synuclein](/proteins/alpha-synuclein) RNA metabolism
Mitochondrial dysfunction links to MATR3

Distal Myopathy with Vocal Cord Paralysis (DM2/VCPD)

MATR3 mutations cause a muscle disease:

Autosomal dominant inheritance
Progressive distal muscle weakness
Vocal cord paralysis
Often accompanied by ALS features[@senderek2015]

Therapeutic Implications

Target Development

RNA-focused therapies:

Antisense oligonucleotides (ASOs) targeting mutant MATR3 transcripts
Small molecules modulating RNA splicing
RNA stabilizers to compensate for processing defects

Protein aggregation modulators:

Compounds preventing MATR3 aggregation
[Autophagy](/entities/autophagy) enhancers to clear MATR3 inclusions

Gene Therapy Approaches

CRISPR-based allele silencing
AAV delivery for gene replacement
Gene editing to correct mutations

Interaction Network

MATR3 interacts with numerous proteins:

| Protein | Interaction Type | Functional Consequence |
|---------|-----------------|----------------------|
| TDP-43 (TARDBP) | Direct binding | RNA processing regulation |
| FUS | Direct binding | ALS/FTD intersection |
| SFPQ | Direct binding | Splicing regulation |
| HNRNPA1 | Direct binding | RNA metabolism |
| VCP/p97 | Direct binding | Protein quality control |
| BRCA1 | Direct binding | DNA repair |
| ATM | Direct binding | DNA damage response |
| Lamin A/C | Indirect | Nuclear structure |

Research Methods

Detecting MATR3 Pathology

Immunohistochemistry: Detecting MATR3 inclusions in tissue
Western blot: Characterizing MATR3 species
Proteomics: Identifying MATR3 interaction networks

Animal Models

Transgenic mice: Expressing mutant MATR3
Knockout mice: Phenotypic characterization
iPSC models: Motor neurons from ALS patients with MATR3 mutations

Summary

MATR3 is a multifunctional nuclear matrix protein critical for RNA processing, DNA repair, and nuclear architecture. Mutations in MATR3 cause familial ALS and distal myopathy, linking this protein to neurodegeneration. The disease mechanisms involve RNA processing defects, stress granule dysfunction, and loss of normal nuclear functions. While directly targeting MATR3 therapeutically remains challenging, understanding its interactions with TDP-43 and other ALS-related proteins provides potential intervention points for drug development.

Background

The study of Matr3 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

[Johnson JO, et al, Mutations in MATR3 cause amyotrophic lateral sclerosis (2013)](https://pubmed.ncbi.nlm.nih.gov/23525006/)

[Senderek J, et al, Mutations in MATR3 impair nuclear targeting (2015)](https://pubmed.ncbi.nlm.nih.gov/25894661/)

Krecic AM, et al, Matrin 3: a matrix scaffold protein with diverse functions (2001)

Tsoi PS, et al, MATR3 and stress granule dynamics in ALS (2018)

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MATR3 Protein

MATR3 Protein

MATR3 Protein

MATR3 Protein — Matrin 3

Introduction

Overview

Protein Structure

Domain Architecture

Post-translational Modifications

Normal Cellular Functions

RNA Processing

DNA Repair

Nuclear Architecture

Stress Response

Role in Neurodegenerative Diseases

Amyotrophic Lateral Sclerosis (ALS)

Frontotemporal Dementia (FTD)

Parkinson's Disease (PD)

Distal Myopathy with Vocal Cord Paralysis (DM2/VCPD)

Therapeutic Implications

Target Development

Gene Therapy Approaches

Interaction Network

Research Methods

Detecting MATR3 Pathology

Animal Models

Summary

Background

External Links

See Also

References