HSPA1A Protein

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HSPA1A Protein

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HSPA1A Protein

<table class="infobox infobox-protein">
<tr><th class="infobox-header" colspan="2">HSPA1A Protein</th></tr>
<tr><td class="label">Protein Name</td><td>Heat Shock 70 kDa Protein 1A (Hsp70-1A)</td></tr>
<tr><td class="label">Gene</td><td>[HSPA1A](/genes/hspa1a)</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">Molecular Weight</td><td>~70 kDa</td></tr>
<tr><td class="label">Subcellular Localization</td><td>Cytoplasm, Nucleus, Cell membrane</td></tr>
<tr><td class="label">Protein Family</td><td>Hsp70 family</td></tr>
<tr><td class="label">Aliases</td><td>HSP70-1A, HSP70, HSPA1A, Hsp70</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/age_related_diseases" style="color:#ef9a9a">AGE_RELATED_DISEASES</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/ami" style="color:#ef9a9a">AMI</a></td>
</tr>
<tr>
<td class="label">SciDEX Hypotheses</td>
<td><a href="/hypothesis/h-5d943bfc" style="color:#ce93d8" title="Score: 0.74">Proteostasis Enhancement via APOE Chaper...</a><br><a href="/hypothesis/h-5dbfd3aa" style="color:#ce93d8" title="Score: 0.51">Heat Shock Protein 70 Disaggregase Ampli...</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">698 edges</a></td>
</tr>
</table>

HSPA1A Protein (Hsp70-1A)

...

HSPA1A Protein

<table class="infobox infobox-protein">
<tr><th class="infobox-header" colspan="2">HSPA1A Protein</th></tr>
<tr><td class="label">Protein Name</td><td>Heat Shock 70 kDa Protein 1A (Hsp70-1A)</td></tr>
<tr><td class="label">Gene</td><td>[HSPA1A](/genes/hspa1a)</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">Molecular Weight</td><td>~70 kDa</td></tr>
<tr><td class="label">Subcellular Localization</td><td>Cytoplasm, Nucleus, Cell membrane</td></tr>
<tr><td class="label">Protein Family</td><td>Hsp70 family</td></tr>
<tr><td class="label">Aliases</td><td>HSP70-1A, HSP70, HSPA1A, Hsp70</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/age_related_diseases" style="color:#ef9a9a">AGE_RELATED_DISEASES</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/ami" style="color:#ef9a9a">AMI</a></td>
</tr>
<tr>
<td class="label">SciDEX Hypotheses</td>
<td><a href="/hypothesis/h-5d943bfc" style="color:#ce93d8" title="Score: 0.74">Proteostasis Enhancement via APOE Chaper...</a><br><a href="/hypothesis/h-5dbfd3aa" style="color:#ce93d8" title="Score: 0.51">Heat Shock Protein 70 Disaggregase Ampli...</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">698 edges</a></td>
</tr>
</table>

HSPA1A Protein (Hsp70-1A)

Pathway Diagram

Mermaid diagram (expand to render)

Introduction

HSPA1A (Heat Shock 70 kDa Protein 1A), also known as Hsp70-1A, is the prototypical stress-inducible molecular chaperone encoded by the [HSPA1A](/genes/hspa1a) gene. As one of the most studied [heat shock proteins](/entities/heat-shock-proteins), HSPA1A plays essential roles in protein homeostasis, cellular stress protection, and cell survival. It is dramatically upregulated in response to various stresses including heat, oxidative stress, and proteotoxic challenges. HSPA1A has emerged as a critical protein in neurodegenerative disease research due to its ability to prevent and clear toxic protein aggregates [1].

Structure

HSPA1A has the canonical Hsp70 domain architecture:

N-terminal ATPase Domain (~44 kDa)

Binds and hydrolyzes ATP
Regulates substrate binding cycle
Contains the characteristic Walker A and B motifs

Substrate-binding Domain (~25 kDa)

Peptide-binding cavity with lid structure
Binds hydrophobic peptide segments
EEVD motif at C-terminus for co-chaperone binding

Interdomain Linker

Connects ATPase and substrate-binding domains
Allosterically couples ATP hydrolysis to substrate binding

Normal Function

Molecular Chaperone Activity

HSPA1A performs ATP-dependent protein folding:

Substrate recognition: Binds hydrophobic regions of unfolded proteins
Folding assistance: Facilitates proper protein folding
Aggregation prevention: Prevents toxic protein aggregate formation
Refolding: Can rescue denatured proteins

Stress Response

As the major stress-inducible Hsp70:

Heat shock response: Primary effector of HSF1 activation
Oxidative stress protection: Counteracts [ROS](/entities/reactive-oxygen-species)-induced damage
Proteotoxic stress: Manages misfolded protein accumulation

Protein Quality Control

HSPA1A is central to cellular proteostasis:

[Ubiquitin-proteasome system](/mechanisms/ubiquitin-proteasome-system): Co-operates with E3 ubiquitin ligases
[Autophagy](/entities/autophagy): Regulates aggrephagy and mitophagy
Protein triage: Decides between refolding, degradation, or sequestration

Anti-apoptotic Function

HSPA1A has well-characterized anti-apoptotic effects:

Inhibits caspase activation
Blocks apoptosome formation
Stabilizes anti-apoptotic proteins

Role in Neurodegeneration

Alzheimer's Disease

HSPA1A plays multiple protective roles in AD:

Amyloid-β management:

Binds to [Aβ](/proteins/amyloid-beta) peptides, preventing aggregation [2]
Facilitates Aβ clearance via proteasome and autophagy
Protects [neurons](/entities/neurons) from Aβ-induced toxicity

[Tau](/proteins/tau) pathology:

Interacts with hyperphosphorylated tau
Facilitates tau clearance
Protects against tau-induced neurodegeneration

Neuroprotection:

Anti-apoptotic functions
Oxidative stress mitigation
Mitochondrial protection

Parkinson's Disease

HSPA1A is particularly important in PD:

[α-Synuclein](/proteins/alpha-synuclein) handling:

Binds to [alpha-synuclein](/proteins/alpha-synuclein) monomers and oligomers [3]
Inhibits α-synuclein fibrillization
Facilitates autophagic clearance of α-synuclein aggregates

Mitochondrial function:

Protects against mitochondrial toxins (e.g., MPTP, 6-OHDA)
Maintains mitochondrial protein quality
Supports mitophagy

Dopaminergic neuron survival:

Specifically protects dopaminergic neurons
Upregulated in PD brains (compensatory response)

Amyotrophic Lateral Sclerosis (ALS)

In ALS:

Handles mutant SOD1 aggregates
Involved in stress granule dynamics
Motor neuron protection

Huntington's Disease

In Huntington's disease:

Binds to mutant [huntingtin](/proteins/huntingtin) [Huntingtin](/proteins/huntingtin) [4]
Reduces polyglutamine aggregation
Improves neuronal survival in models

Therapeutic Implications

HSPA1A is a major therapeutic target:

Pharmacological Modulation

Small molecules that increase HSPA1B expression:

Geranylgeranylacetone (GGA): Induces HSPA1A expression
Arimoclomol: HSP co-inducer in clinical trials for ALS
17-DMAG: HSP90 inhibitor (indirect HSPA1A inducer)

Gene Therapy

AAV-mediated HSPA1A delivery to brain
Viral vector-based approaches

Protein-based Approaches

Recombinant Hsp70 administration
Cell-permeable Hsp70 variants

Research Findings

Key developments:

HSPA1A is consistently upregulated in neurodegenerative disease brains
Genetic variants of HSPA1A modify disease risk and progression
HSPA1A-based therapies show promise in preclinical models

References

[Stefan et al., HSP70 in neurodegeneration (2019) (2019)](https://doi.org/10.1016/j.tcb.2019.01.006)

[Evans et al., HSP70 and amyloid-beta (2006) (2006)](https://doi.org/10.1074/jbc.M513953200)

[S里 et al., HSP70 and alpha-synuclein (2012) (2012)](https://doi.org/10.1074/jbc.M112.387530)

[Muchowski et al., HSP70 in polyglutamine disease (2002) (2002)](https://doi.org/10.1073/pnas.032534799)

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

[Heat Shock Protein 70 Disaggregase Amplification](/hypothesis/h-5dbfd3aa) — <span style="color:#ffd54f;font-weight:600">0.51</span> · Target: HSPA1A
[Chaperone-Mediated APOE4 Refolding Enhancement](/hypothesis/h-637a53c9) — <span style="color:#ffd54f;font-weight:600">0.48</span> · Target: HSPA1A, HSP90AA1, DNAJB1, FKBP5
[Microbial Metabolite-Mediated α-Synuclein Disaggregation](/hypothesis/h-74777459) — <span style="color:#ffd54f;font-weight:600">0.43</span> · Target: SNCA, HSPA1A, DNMT1

Pathway Diagram

The following diagram shows the key molecular relationships involving HSPA1A Protein discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

HSPA1A

▸Metadataorigin_type: v1_polymorphic_backfill

slug	proteins-hspa1a
kg_node_id	HSPA1A
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-ae49a01154d0
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-hspa1a'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

100%

Debates

0

Incoming

223

Outgoing

284

0 supporting 0 contradicting 0 neutral

View full evidence profile →

Public annotations (0)Annotate on Hypothes.is →

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📗 Cite This Artifact

HSPA1A Protein

HSPA1A Protein

HSPA1A Protein (Hsp70-1A)

HSPA1A Protein

HSPA1A Protein (Hsp70-1A)

Pathway Diagram

Introduction

Structure

N-terminal ATPase Domain (~44 kDa)

Substrate-binding Domain (~25 kDa)

Interdomain Linker

Normal Function

Molecular Chaperone Activity

Stress Response

Protein Quality Control

Anti-apoptotic Function

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Huntington's Disease

Therapeutic Implications

Pharmacological Modulation

Gene Therapy

Protein-based Approaches

Research Findings

See Also

References

Pathway Diagram

💬 Discussion

📗 Cite This Artifact

HSPA1A Protein

HSPA1A Protein

HSPA1A Protein (Hsp70-1A)

HSPA1A Protein

HSPA1A Protein (Hsp70-1A)

Pathway Diagram

Introduction

Structure

N-terminal ATPase Domain (~44 kDa)

Substrate-binding Domain (~25 kDa)

Interdomain Linker

Normal Function

Molecular Chaperone Activity

Stress Response

Protein Quality Control

Anti-apoptotic Function

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Huntington's Disease

Therapeutic Implications

Pharmacological Modulation

Gene Therapy

Protein-based Approaches

Research Findings

See Also

References

Related Hypotheses

Pathway Diagram

💬 Discussion