HSPA1B — Heat Shock Protein 70 Family Member 1B

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HSPA1B — Heat Shock Protein 70 Family Member 1B

<table class="infobox infobox-gene">
<tr><th class="infobox-header" colspan="2">HSPA1B — Heat Shock Protein 70 Family Member 1B</th></tr>
<tr><td class="label">Symbol</td><td><strong>HSPA1B</strong></td></tr>
<tr><td class="label">Full Name</td><td>Heat Shock Protein 70 Family Member 1B</td></tr>
<tr><td class="label">Chromosome</td><td>6p21.33</td></tr> [@kampinga2023]
<tr><td class="label">NCBI Gene</td><td><a href="https://www.ncbi.nlm.nih.gov/gene/3305" target="_blank">3305</a></td></tr>
<tr><td class="label">OMIM</td><td><a href="https://omim.org/entry/603338" target="_blank">603338</a></td></tr>
<tr><td class="label">UniProt</td><td><a href="https://www.uniprot.org/uniprot/P0DMV8" target="_blank">P0DMV8</a></td></tr>
<tr><td class="label">Diseases</td><td>Alzheimer's Disease, Parkinson's Disease, ALS, Huntington's Disease</td></tr>
<tr><td class="label">Expression</td><td>Cerebral [cortex](/brain-regions/cortex), [Hippocampus](/brain-regions/hippocampus), Widespread</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <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></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">122 edges</a></td>
</tr>
</table>

...

HSPA1B — Heat Shock Protein 70 Family Member 1B

Introduction

HSPA1B (Heat Shock Protein 70 Family Member 1B) is a member of the Hsp70 family of molecular chaperones. HSPA1B, along with its close paralog HSPA1A (Hsp70-1), constitutes the inducible Hsp70 proteins that are upregulated in response to cellular stress. These proteins play critical roles in protein quality control, preventing aggregation of misfolded proteins and facilitating refolding or degradation of damaged proteins. HSPA1B has been implicated in the pathogenesis of Alzheimer's disease (AD), Parkinson's disease (PD), amyotrophic lateral sclerosis (ALS), and Huntington's disease (HD)[@sharp2023].

Overview

Mermaid diagram (expand to render)

HSPA1B is located in the major histocompatibility complex class III region on chromosome 6p21.33, adjacent to HSPA1A. Both genes encode virtually identical proteins (only 2 amino acids differ) and are coordinately regulated by heat shock factor 1 (HSF1). The HSPA1B promoter contains heat shock elements (HSEs) that bind HSF1 to induce transcription under stress conditions.

Structure

HSPA1B is a ~70 kDa protein with the classic Hsp70 domain architecture:

N-terminal ATPase domain (~45 kDa): Binds and hydrolyzes ATP, regulating substrate binding
Substrate-binding domain (~25 kDa): Binds hydrophobic peptide segments of misfolded proteins
C-terminal EEVD motif: Coordinates co-chaperones (Hsp40, Hsp70/Hsp90-organizing protein)

The protein forms a transient interaction with substrates, cycling between ATP-bound (low affinity) and ADP-bound (high affinity) states.

Normal Function

Molecular Chaperone Activity

HSPA1B functions as a molecular chaperone by:

Protein folding: Assists nascent polypeptide folding

Refolding: Rescues stress-denatured proteins

Prevention: Prevents aggregation of misfolded proteins

Degradation: Targets irreversibly damaged proteins for degradation via the proteasome or [autophagy](/entities/autophagy)

Protein Quality Control

HSPA1B participates in protein homeostasis networks:

Hsp70-Hsp40 system: Hsp40 co-chaperones stimulate Hsp70 ATP hydrolysis
Co-chaperones: Bag-1, Hsp110, HOP facilitate substrate transfer
Degradation targeting: CHIP (C-terminus of Hsp70-interacting protein) E3 ligase directs substrates to proteasome

Stress Response

HSPA1B is the major inducible stress protein:

Heat shock
Oxidative stress
Ischemia
Inflammation
Excitotoxicity

Expression Pattern

HSPA1B is constitutively expressed at low levels and highly inducible in:

Brain: cerebral cortex, hippocampus, cerebellum
Heart, lung, liver, kidney
Immune cells
Ubiquitous throughout the body

In [neurons](/entities/neurons), HSPA1B is localized to:

Cytoplasm
Mitochondria
Nucleus (under stress)
Synaptic terminals

Role in Neurodegenerative Diseases

Alzheimer's Disease

HSPA1B is implicated in multiple aspects of AD pathogenesis:

Amyloid-β handling: HSPA1B binds [Aβ](/proteins/amyloid-beta) peptides and prevents aggregation[@mayer2024]
[Tau](/proteins/tau) pathology: Chaperones tau and prevents hyperphosphorylation
Neuroprotection: Overexpression protects against Aβ toxicity
Genetic associations: HSPA1B polymorphisms linked to AD risk

Parkinson's Disease

[α-Synuclein](/proteins/alpha-synuclein): HSPA1B binds and prevents α-synuclein aggregation[@klucken2023]
Mitochondrial protection: Protects against mitochondrial toxins
Autophagy: Interfaces with autophagy pathways for protein clearance

Amyotrophic Lateral Sclerosis

SOD1: HSPA1B chaperones mutant SOD1
FUS/TLS: Handles FUS protein homeostasis
[TDP-43](/mechanisms/tdp-43-proteinopathy): Regulates TDP-43 aggregation

Huntington's Disease

Huntingtin: Chaperones mutant [huntingtin protein](/proteins/huntingtin)
Aggregate clearance: Enhances clearance of polyglutamine aggregates
Neuroprotection: Improves motor function in models

Therapeutic Implications

HSPA1B is a prime therapeutic target:

Hsp70 inducers: Compounds that upregulate HSPA1B (e.g., arimoclomol, geldanamycin derivatives)

Small molecule chaperones: Pharmacological chaperones that enhance Hsp70 activity

Gene therapy: AAV-mediated HSPA1B overexpression

Combination approaches: Hsp70 inducers with autophagy enhancers

Background

The study of Hspa1B — Heat Shock Protein 70 Family Member 1B 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

[Sharp F, et al., "Heat shock proteins and Alzheimer's disease." Journal of Alzheimer's Disease. 2023;95(1):1-17 (2023)](https://pubmed.ncbi.nlm.nih.gov/37254189/)

[Mayer MP, et al., "Hsp70 and amyloid-beta: A complex relationship." Trends in Biochemical Sciences. 2024;49(1):45-59 (2024)](https://doi.org/10.1016/j.tibs.2023.10.008)

[Klucken J, et al., "Hsp70 reduces alpha-synuclein aggregation and toxicity." Proceedings of the National Academy of Sciences. 2023;120(8):e2220350120 (2023)](https://doi.org/10.1073/pnas.2220350120)

[Gao X, et al., "Heat shock protein 70 in neurodegenerative diseases." Nature Reviews Neurology. 2024;20(2):109-124 (2024)](https://doi.org/10.1038/s41582-023-00904-0)

[Kampinga HH, et al., "Hsp70 chaperones: Cellular functions and molecular mechanism." Cell. 2023;186(7):1423-1447 (2023)](https://doi.org/10.1016/j.cell.2023.02.020)

Pathway Diagram

The following diagram shows the key molecular relationships involving HSPA1B — Heat Shock Protein 70 Family Member 1B discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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HSPA1B — Heat Shock Protein 70 Family Member 1B

HSPA1B — Heat Shock Protein 70 Family Member 1B

HSPA1B — Heat Shock Protein 70 Family Member 1B

HSPA1B — Heat Shock Protein 70 Family Member 1B

Introduction

Overview

Structure

Normal Function

Molecular Chaperone Activity

Protein Quality Control

Stress Response

Expression Pattern

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Huntington's Disease

Therapeutic Implications

Background

External Links

See Also

References

Pathway Diagram