DNAJC2 - DnaJ Heat Shock Protein Family Member C2

DNAJC2 - DnaJ Heat Shock Protein Family Member C2

Introduction

Dnajc2 Dnaj Heat Shock Protein Family Member C2 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

DNAJC2 - DnaJ Heat Shock Protein Family Member C2

Introduction

Dnajc2 Dnaj Heat Shock Protein Family Member C2 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

DNAJC2 (DnaJ Heat Shock Protein Family Member C2), also known as MPDZ (Multiple PDZ Domain Crumbs Cell Polarity Complex Component) or Zuotin, is a Hsp40 family co-chaperone involved in protein folding and quality control. It is encoded by the DNAJC2 gene located on chromosome 9p24. DNAJC2 plays important roles in maintaining cellular proteostasis, particularly in [neurons](/entities/neurons) where protein aggregation is a hallmark of neurodegenerative diseases. [@dnajc2019]

<div class="infobox infobox-gene"> [@hsp2021]
<table> [@proteostasis2022]
<tr><th colspan="2" style="background:#f0f0f0;">DNAJC2</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>DNAJC2</td></tr>
<tr><td><strong>Full Name</strong></td><td>DnaJ Heat Shock Protein Family Member C2</td></tr>
<tr><td><strong>Chromosome</strong></td><td>9p24</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[27000](https://www.ncbi.nlm.nih.gov/gene/27000)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[607071](https://www.omim.org/entry/607071)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>[ENSG00000137770](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000137770)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9Y2H5](https://www.uniprot.org/uniprot/Q9Y2H5)</td></tr>
<tr><td><strong>Protein Length</strong></td><td>640 amino acids</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/dementia" style="color:#ef9a9a">Dementia</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">30 edges</a></td>
</tr>
</table>
</div>

Molecular Structure

DNAJC2 contains several functional domains:

| Domain | Position | Function |
|--------|----------|----------|
| J domain | N-terminal | Hsp70 ATPase stimulation |
| Gly/Phe-rich region | Central | Substrate binding |
| C-terminal domain | C-terminal | Dimerization, interactions |
| Multiple zinc fingers | Various | DNA/RNA/protein binding |

Molecular Function

Hsp40 Co-chaperone Activity

DNAJC2 functions as a co-chaperone:

Other Functions

• Ribosome-associated quality control (RQC): Involved in co-translational folding surveillance
• Neuroprotection: Protects neurons against proteotoxic stress
• Zinc finger domain: May have additional DNA/RNA binding functions
• Protein complex scaffolding: Multiple PDZ domains suggest scaffolding function

Normal Function

In neurons, DNAJC2 participates in:

Expression Pattern

DNAJC2 is expressed in various brain regions:

| Brain Region | Expression Level |
|--------------|-----------------|
| Cerebral [cortex](/brain-regions/cortex) | High |
| [Hippocampus](/brain-regions/hippocampus) | High |
| Cerebellum | Moderate |
| Basal ganglia | Moderate |
| Spinal cord | Lower |

Role in Neurodegeneration

Alzheimer's Disease

In AD, DNAJC2 may be involved in:

Parkinson's Disease

• [α-Synuclein](/proteins/alpha-synuclein) clearance: Assists in degrading misfolded α-synuclein
• Mitochondrial protein quality control: DNAJC2 localizes to mitochondria
• [LRRK2](/entities/lrrk2) interactions: May interact with PD-linked kinases
• Dopaminergic neuron vulnerability: May affect protein handling in SNc

ALS

• Protein homeostasis: Maintains proteostasis in motor neurons
• Stress granule dynamics: May regulate stress granule formation
• RNA-protein aggregates: Interactions with RNA-binding proteins in ALS
• Proteostasis enhancement: Therapeutic target for enhancing clearance

Frontotemporal Dementia

• [TDP-43](/proteins/tdp-43) clearance: May assist in clearing [TDP-43](/mechanisms/tdp-43-proteinopathy) aggregates
• Protein quality control network: Part of the broader PQC system

Animal Models

| Model | Findings | Relevance |
|-------|----------|-----------|
| DNAJC2 knockout | Embryonic lethal in mice | Essential gene |
| Knockdown models | Altered stress response | PD research |
| Overexpression | Neuroprotection in models | Therapeutic potential |

Therapeutic Targeting

| Approach | Mechanism | Development Stage |
|----------|-----------|-------------------|
| Hsp70/Hsp40 modulators | Enhance protein clearance | Research |
| Gene therapy | Increase DNAJC2 expression | Preclinical |
| Proteostasis enhancers | Boost cellular QC capacity | Research |
| Small molecule activators | Increase co-chaperone activity | Early research |

Disease Associations

| Disease | Role | Evidence |
|---------|------|----------|
| Alzheimer's Disease | Protein quality control | Altered expression in AD brain |
| [Parkinson's Disease](/diseases/parkinsons-disease-disease) | α-Synuclein clearance | Protective in cellular models |
| ALS | Proteostasis | Dysregulated in ALS motor neurons |
| FTD | TDP-43 clearance | Part of PQC network |

Key Publications

See Also

• [Hsp40](/proteins/hsp40-protein)
• [Hsp70](/proteins/hsp70)
• [Protein Quality Control](/mechanisms/protein-quality-control-network)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [ALS](/diseases/als)
• [Alpha-Synuclein](/proteins/snca-protein)
• [Tau](/proteins/tau)

External Links

• [NCBI Gene: DNAJC2](https://www.ncbi.nlm.nih.gov/gene/27000)
• [UniProt: Q9Y2H5](https://www.uniprot.org/uniprot/Q9Y2H5)
• [GeneCards: DNAJC2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=DNAJC2)
• [OMIM: DNAJC2](https://www.omim.org/entry/607071)

Background

The study of Dnajc2 Dnaj Heat Shock Protein Family Member C2 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

Pathway Diagram

The following diagram shows the key molecular relationships involving DNAJC2 - DnaJ Heat Shock Protein Family Member C2 discovered through SciDEX knowledge graph analysis: