Matrin-3 Protein

Matrin-3 Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Matrin-3 Protein</th>
</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">PDB</td>
<td><a href="https://www.rcsb.org/structure/5D99" target="_blank">5D99</a></td>
</tr>
<tr>
<td class="label">Mol. Weight</td>
<td>125 kDa</td>
</tr>
<tr>
<td class="label">Localization</td>
<td>Nuclear matrix, speckles</td>
</tr>
<tr>
<td class="label">Family</td>
<td>Matrin-3 family, RNA-binding </tr>
proteins</td>
<tr>
<td class="label">Diseases</td>
<td>[ALS](/diseases/als), [FTD](/diseases/ftd), [Parkinson's Disease](/diseases/parkinsons-disease)</td>
</tr>
</table>

Matrin-3 Protein

Introduction

Matrin 3 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

...

Matrin-3 Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Matrin-3 Protein</th>
</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">PDB</td>
<td><a href="https://www.rcsb.org/structure/5D99" target="_blank">5D99</a></td>
</tr>
<tr>
<td class="label">Mol. Weight</td>
<td>125 kDa</td>
</tr>
<tr>
<td class="label">Localization</td>
<td>Nuclear matrix, speckles</td>
</tr>
<tr>
<td class="label">Family</td>
<td>Matrin-3 family, RNA-binding </tr>
proteins</td>
<tr>
<td class="label">Diseases</td>
<td>[ALS](/diseases/als), [FTD](/diseases/ftd), [Parkinson's Disease](/diseases/parkinsons-disease)</td>
</tr>
</table>

Matrin-3 Protein

Introduction

Matrin 3 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

Matrin-3 is a nuclear matrix protein with dual roles as an RNA-binding protein and DNA-binding transcription factor["@johnson2014"]. Mutations in MATR3 are causally linked to familial amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), establishing it as an important disease protein in neurodegeneration["@giordano2013"].

The MATR3 gene encodes a protein of approximately 847 amino acids that is ubiquitously expressed but with highest levels in skeletal muscle and neuronal tissues. Matrin-3 is a core component of the nuclear matrix, the structural framework that organizes the nucleus["@zhang2019"].

Structure

Matrin-3 contains multiple functional domains:

RRM Domains

Two RNA recognition motifs (RRM1 and RRM2) in the central region mediate RNA binding. These domains are highly conserved and recognize specific RNA sequences.

Zinc-Finger Domains

Multiple C2H2-type zinc-finger domains in the C-terminal region mediate DNA binding and protein-protein interactions.

Nuclear Localization Signals

NLS sequences direct Matrin-3 to the nuclear compartment.

Glycine-Rich Region

A glycine-rich domain facilitates protein-protein interactions[@tao2020].

Normal Function

Nuclear Matrix Organization

Matrin-3 is a principal component of the nuclear matrix:

• Provides structural scaffold for nuclear organization
• Organizes chromatin domains
• Facilitates RNA processing and transport

RNA Processing

As an RNA-binding protein, Matrin-3 participates in:

• Pre-mRNA processing
• RNA stability and turnover
• Transport of RNAs between nucleus and cytoplasm

Transcription Regulation

Matrin-3 functions as a transcriptional co-regulator:

• Modulates gene expression
• Interacts with transcription factors
• Regulates neuronal gene expression[^5]

Role in Disease

Amyotrophic Lateral Sclerosis (ALS)

Dominant mutations in MATR3 cause familial ALS, typically with a late onset and predominantly upper motor neuron involvement. Notable mutations include:

• Phe115Cys (F115C)
• Val786Met (V786M)

The pathogenic mechanisms include:

• Loss of normal RNA processing function
• Toxic gain-of-function from mutant protein
• Disruption of nuclear-cytoplasmic transport[^6]

Frontotemporal Dementia (FTD)

MATR3 mutations also cause FTD, often with overlapping clinical features with ALS. [TDP-43](/mechanisms/tdp-43-proteinopathy) pathology is commonly observed in MATR3-associated FTD[^7].

Parkinson's Disease

Matrin-3 interacts with proteins implicated in PD pathogenesis, including:

• Parkin
• PINK1
• [Alpha-synuclein](/proteins/alpha-synuclein)

Dysregulation of Matrin-3 function may contribute to dopaminergic neuron vulnerability[^8].

Therapeutic Targeting

Current therapeutic approaches include:

• RNA processing modulators: Compounds that normalize RNA metabolism
• Nuclear transport enhancers: Restore proper nucleocytoplasmic transport
• Gene therapy: Allele-specific approaches to silence mutant MATR3
• Protein aggregation inhibitors: Prevent toxic Matrin-3 aggregation[^9]

Background

The study of Matrin 3 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.

See Also

• [ALS](/diseases/amyotrophic-lateral-sclerosis)
• [Frontotemporal Dementia](/diseases/frontotemporal-dementia)
• [TDP-43](/biomarkers/tdp-43)
• [FUS Protein](/entities/fus-protein)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [UniProt: Matrin-3](https://www.uniprot.org/uniprot/P43243)
• [RCSB PDB: Matrin-3](https://www.rcsb.org/structure/5D99)
• [Gene: MATR3 (NCBI)](https://www.ncbi.nlm.nih.gov/gene/9782)
• [OMIM: MATR3](https://www.omim.org/entry/614303)

References

[Johnson et al., Mutations in MATR3 cause ALS (2014) (2014)](https://doi.org/10.1016/j.neuron.2014.10.016)

[Giordano et al., Matrin-3 in RNA processing (2013) (2013)](https://doi.org/10.1093/nar/gkt314)

[Zhang et al., Matrin-3 and TDP-43 pathology (2019) (2019)](https://doi.org/10.1002/ana.25499)

[Tao et al., Matrin-3 in nuclear organization (2020) (2020)](https://doi.org/10.1074/jbc.RA119.011543)

Pathway Diagram

The following diagram shows the key molecular relationships involving Matrin-3 Protein discovered through SciDEX knowledge graph analysis: