DNAJC13 Protein (RME-8)

DNAJC13 Protein (RME-8)

Introduction

Dnajc13 Protein (Rme 8) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-protein"> [@fujiwara2016]
<div class="infobox-header">DNAJC13 Protein</div> [@shi2021]
<div class="infobox-content"> Protein Name: DNAJC13 (RME-8)<br/> Gene: DNAJC13<br/> UniProt ID: Q7Z594<br/> Molecular Weight: 206 kDa<br/> Subcellular Localization: Endosomes, Cytoplasm<br/> Protein Family: Hsp40 (DNAJ) family<br/> Aliases: RME-8, Receptor-mediated endocytosis 8
</div>
</div>

Overview

DNAJC13 (also known as RME-8) is a J-domain containing protein that functions in endosomal trafficking. It plays important roles in protein sorting through the endosomal system and has been implicated in Parkinson's disease.

Structure

DNAJC13 contains:

• J-domain: N-terminal region for Hsp70 interaction
• WD40 repeats: Multiple WD40 repeat domains forming a beta-propeller
• Plant homeodomain (PHD): Zinc finger domain for protein interactions

Normal Function

DNAJC13/RME-8 is involved in endosomal trafficking:

...

DNAJC13 Protein (RME-8)

Introduction

Dnajc13 Protein (Rme 8) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-protein"> [@fujiwara2016]
<div class="infobox-header">DNAJC13 Protein</div> [@shi2021]
<div class="infobox-content"> Protein Name: DNAJC13 (RME-8)<br/> Gene: DNAJC13<br/> UniProt ID: Q7Z594<br/> Molecular Weight: 206 kDa<br/> Subcellular Localization: Endosomes, Cytoplasm<br/> Protein Family: Hsp40 (DNAJ) family<br/> Aliases: RME-8, Receptor-mediated endocytosis 8
</div>
</div>

Overview

DNAJC13 (also known as RME-8) is a J-domain containing protein that functions in endosomal trafficking. It plays important roles in protein sorting through the endosomal system and has been implicated in Parkinson's disease.

Structure

DNAJC13 contains:

• J-domain: N-terminal region for Hsp70 interaction
• WD40 repeats: Multiple WD40 repeat domains forming a beta-propeller
• Plant homeodomain (PHD): Zinc finger domain for protein interactions

Normal Function

DNAJC13/RME-8 is involved in endosomal trafficking:

• Endosomal Sorting: Regulates early endosome function and cargo recycling
• Clathrin Dynamics: Interacts with clathrin coat components
• Protein Sorting: Facilitates sorting of membrane proteins through endosomal compartments
• [Autophagy](/entities/autophagy): Modulates autophagosome formation and maturation
• Synaptic Vesicle Cycling: Contributes to endocytic recycling at synapses

Role in Disease

Parkinson's Disease

DNAJC13 mutations cause autosomal dominant PD:

• The p.N855S mutation is pathogenic
• Alters endosomal sorting and protein clearance
• Contributes to [alpha-synuclein](/proteins/alpha-synuclein) aggregation
• Late-onset typical PD phenotype

Lewy Body Dementia

DNAJC13 variants may modify DLB risk:

• Altered endosomal function in Lewy body formation
• Interaction with [alpha-synuclein](/proteins/alpha-synuclein) pathology

Essential Tremor

DNAJC13 has been implicated in essential tremor.

Therapeutic Targeting

| Strategy | Approach | Status |
|----------|----------|--------|
| Small Molecule Modulators | Endosomal trafficking enhancers | Research |
| Gene Therapy | AAV-mediated DNAJC13 modulation | Theoretical |
| Autophagy Enhancement | [mTOR](/entities/mtor) inhibitors, [TFEB](/proteins/tfeb) activators | Preclinical |

Key Publications

Vilarino-Guell C, et al. (2014). "DNAJC13 mutations in Parkinson disease." Am J Hum Genet 94(1):106-115. PMID: 24444654(https://pubmed.ncbi.nlm.nih.gov/24444654/).[@vallelonga2020]

Fujiwara H, et al. (2016). "RME-8 functions in endosomal trafficking." J Cell Sci 129(Pt 6):1085-1095. PMID: 27026525(https://pubmed.ncbi.nlm.nih.gov/27026525/).[@fujiwara2016]

Zhang J, et al. (2018). "DNAJC13 and endosomal dysfunction in PD." Neurobiol Dis 115:45-57. PMID: 29486216(https://pubmed.ncbi.nlm.nih.gov/29486216/).[@shi2021]

See Also

• [DNAJC13 Gene](/proteins/dnajc13-protein)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Lewy Body Dementia](/diseases/lewy-body-dementia)
• [Endosomal Trafficking](/mechanisms/endosomal-trafficking)mechanisms/endosomal-lysosomal-pathway)
• [Alpha-Synuclein Aggregation Pathway](/mechanisms/alpha-synuclein-aggregation-pathway)
• [DNAJC6 Protein](/proteins/dnajc6-protein)

External Links

• [UniProt: DNAJC13](https://www.uniprot.org/uniprot/Q7Z594)
• [NCBI Protein: DNAJC13](https://www.ncbi.nlm.nih.gov/protein/NP_060621)

Clinical Significance

DNAJC13-related Parkinson's disease has distinct features:

Phenotype

• [Typical Lewy body pathology](/genes/th)
• [Rapid disease progression in some families](/diseases/disease-progression)
• [Good levodopa response initially](/brain-regions/pons)
• [May present with dementia in later stages](/events/aan-2026/dementia)

Genetics

• Autosomal dominant inheritance
• [p.N855S mutation identified in multiple families](/genes/ide)
• [Variable penetrance suggesting modifier genes](/genes)
• Possible gene-environment interactions

Management

• Standard PD medications effective initially
• Dopamine agonists and levodopa
• Physical therapy and exercise
• Deep brain stimulation in select cases

Research Directions

Current Studies

• Understanding endosomal dysfunction in PD
• Developing Hsp70-based therapeutics
• Biomarker development for early detection
• Gene therapy approaches

Model Systems

• Knock-in mouse models with p.N855S
• Patient-derived [neurons](/entities/neurons) for drug screening
• Yeast models for protein aggregation
• Drosophila models for in vivo studies

Protein Interactions

DNAJC13 participates in protein networks:

| Partner | Interaction | Functional Consequence |
|---------|-------------|----------------------|
| Hsc70 (HSPA8) | J-domain binding | ATP-dependent protein remodeling |
| Clathrin | Coat interaction | Endosomal sorting |
| RAB proteins | RAB5, RAB7 | Endosome maturation |
| Auxilin (DNAJC6) | Co-chaperone | Synaptic vesicle endocytosis |
| GGA proteins | Sorting | Cargo trafficking |

Therapeutic Targeting

| Strategy | Approach | Stage |
|----------|----------|-------|
| Hsp70 Modulation | 2-phenylethynesulfonamide (PES) | Preclinical |
| Endosomal Function | RAB5 modulators | Research |
| Gene Therapy | AAV-DNAJC13 | Conceptual |
| Small Molecule | J-domain inhibitors | Early discovery |

Background

The study of Dnajc13 Protein (Rme 8) 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

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