DNAJB8 is a member of the DnaJ/Hsp40 family of molecular chaperones. It is expressed in stem cells and certain somatic tissues, including the brain, where it plays a role in protein quality control and may protect against age-related protein aggregation diseases. [@cao2019]
Introduction
DNAJB8 (DnaJ Heat Shock Protein Family Member B8) is a co-chaperone that works with Hsp70 family proteins to facilitate protein folding, prevent aggregation, and target misfolded proteins for degradation. It is part of the cellular protein quality control machinery that becomes increasingly important in age-related neurodegenerative diseases. [@broadley2008]
<div class="infobox infobox-gene">
| Property | Value | |----------|-------| | Gene Symbol | DNAJB8 | | Full Name | DnaJ Heat Shock Protein Family (Hsp40) Member B8 | | Chromosomal Location | 3p21.31 | | NCBI Gene ID | 165727 | | OMIM ID | — | | Ensembl ID | ENSG00000179421 | | UniProt ID | Q8N5M4 | | Encoded Protein | DNAJB8 protein | | Associated Diseases | Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, protein aggregation disorders |
</div>
Function
DNAJB8 is a J-domain containing co-chaperone:
Chaperone Function
J-domain recruits and stimulates Hsp70 ATPase activity
Helps Hsp70 bind to misfolded proteins
Prevents protein aggregation
Facilitates protein refolding
...
title: DNAJB8 Gene
DNAJB8 (DnaJ Heat Shock Protein Family Member B8)
Overview
DNAJB8 is a member of the DnaJ/Hsp40 family of molecular chaperones. It is expressed in stem cells and certain somatic tissues, including the brain, where it plays a role in protein quality control and may protect against age-related protein aggregation diseases. [@cao2019]
Introduction
DNAJB8 (DnaJ Heat Shock Protein Family Member B8) is a co-chaperone that works with Hsp70 family proteins to facilitate protein folding, prevent aggregation, and target misfolded proteins for degradation. It is part of the cellular protein quality control machinery that becomes increasingly important in age-related neurodegenerative diseases. [@broadley2008]
<div class="infobox infobox-gene">
| Property | Value | |----------|-------| | Gene Symbol | DNAJB8 | | Full Name | DnaJ Heat Shock Protein Family (Hsp40) Member B8 | | Chromosomal Location | 3p21.31 | | NCBI Gene ID | 165727 | | OMIM ID | — | | Ensembl ID | ENSG00000179421 | | UniProt ID | Q8N5M4 | | Encoded Protein | DNAJB8 protein | | Associated Diseases | Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, protein aggregation disorders |
</div>
Function
DNAJB8 is a J-domain containing co-chaperone:
Chaperone Function
J-domain recruits and stimulates Hsp70 ATPase activity
Helps Hsp70 bind to misfolded proteins
Prevents protein aggregation
Facilitates protein refolding
Specific Functions
Expressed in neural stem cells
Protects against oxidative stress
May have role in mitochondrial quality control
Exists in cytosolic and mitochondrial isoforms
Protein Quality Control
Part of the Hsp70/Hsp40 chaperone system
Targets aggregation-prone proteins
May deliver proteins to the proteasome or [autophagy](/entities/autophagy) system
[Alzheimer's disease](/diseases/alzheimers-disease) - Disease association
[Parkinson's disease](/diseases/parkinsons-disease) - Disease association
Allen Brain Atlas Data
Gene Expression: Human brain expression data from Allen Brain Atlas shows DNAJB8 is expressed across multiple brain regions with highest expression in cerebral cortex and hippocampus. Expression patterns are consistent with its role in testis-specific chaperone, neuronal expression.
Single-Cell Expression: Single-cell RNA-seq data from the Allen Brain Cell Atlas shows DNAJB8 expression across major brain cell types, with enrichment in neurons and astrocytes.