| Gene | [HSPA1A](/genes/hspa1a) |
| UniProt ID | [P0DMV8](https://www.uniprot.org/uniprot/P0DMV8) |
| PDB Structures | [4PO2](https://www.rcsb.org/structure/4PO2), [5E84](https://www.rcsb.org/structure/5E84) |
| Molecular Weight | 70.0 kDa |
| Amino Acids | 641 |
| Subcellular Location | Cytosol, nucleus |
| Protein Family | Hsp70 family |
Heat Shock Protein 70 family member 1A (HSPA1A), also known as Hsp70-1 or Hsp72, is a 70 kDa molecular chaperone that plays essential roles in protein folding, quality control, and cellular stress response[1]. Encoded by the HSPA1A gene within the major histocompatibility complex class III region on chromosome 6p21.3, HSPA1A is the stress-inducible member of the Hsp70 family that is rapidly upregulated in response to proteotoxic insults[2].
In the nervous system, HSPA1A protects neurons from protein aggregation stress by preventing misfolding, facilitating refolding of damaged proteins, and targeting irreversibly damaged proteins for degradation[3]. Its neuroprotective functions are particularly relevant to neurodegenerative diseases characterized by protein misfolding, including Alzheimer's disease, Parkinson's disease, and Huntington's disease[4].
HSPA1A consists of two major functional domains connected by a conserved linker[5]:
HSPA1A maintains proteostasis through multiple mechanisms[6]:
As a stress-inducible chaperone, HSPA1A provides rapid protection against proteotoxic stress[7]:
HSPA1A supports synaptic integrity via[8]:
HSPA1A plays multiple protective roles in AD[9]:
HSPA1A modulates α-synuclein pathology[11]:
In HD models, HSPA1A[12]:
HSPA1A protects against SOD1 and TDP-43 aggregation[13]:
Hsp70 inducers[14]:
Hsp70 activity modulators[15]:
Hsp70 gene delivery[16]:
Synergistic strategies include[17]:
| Interactor | Function | Disease Relevance |
|---|---|---|
| HSP40/DNAJB1 | ATPase stimulation, substrate delivery | Protein folding |
| CHIP/STUB1 | Ubiquitin ligase, degradation | Protein quality control |
| BAG1 | Nucleotide exchange, proteasome targeting | Degradation |
| BAG3 | Autophagy targeting | Aggregate clearance |
| Hsp110/HSPA4 | Nucleotide exchange, holdase | Protein folding |
| Tau | Substrate, prevents aggregation | AD |
| α-synuclein | Substrate, prevents aggregation | PD |
| Huntingtin | Substrate, prevents aggregation | HD |
HSPA1A is a stress-inducible molecular chaperone that serves as a critical component of the cellular proteostasis network. Its ability to prevent protein aggregation, refold damaged proteins, and target irreversibly damaged proteins for degradation makes it a promising therapeutic target for neurodegenerative diseases characterized by protein misfolding. Current therapeutic approaches focus on pharmacological induction and direct modulation of Hsp70 activity.
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Lindquist S, Craig EA. The heat-shock proteins. Annual Review of Genetics. 1988. ↩︎
Muchowski PJ, Wacker JL. Modulation of neurodegeneration by molecular chaperones. Nature Reviews Neuroscience. 2005. ↩︎
Morimoto RI. Proteotoxic stress and the aging proteome. Nature Reviews Molecular Cell Biology. 2010. ↩︎
Zuiderweg ER, Bertelsen EB, Rousaki A, et al. Allostery in the Hsp70 chaperone proteins. Topics in Current Chemistry. 2013. ↩︎
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Morgan JR, Zhao X, Womack M, et al. A role for the chaperone protein Hsp70 in the regulation of synaptic vesicle recycling. Journal of Neuroscience. 2001. ↩︎
Evans CG, Wisén S, Gestwicki JE. Heat shock proteins 70 and 90 inhibit early stages of amyloid β-(1-42) aggregation in vitro. Journal of Biological Chemistry. 2006. ↩︎
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Okado-Matsumoto A, Myint T, Fujii J, Taniguchi N. Chick glutathione peroxidase-1 is a stress-inducible enzyme. Journal of Biochemistry. 2000. ↩︎
Kiaei M, Kipani K, Petri S, et al. Arimoclomol prolongs survival in a transgenic animal model of amyotrophic lateral sclerosis. Amyotrophic Lateral Sclerosis. 2006. ↩︎
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Dong X, Yao J, Liu C, et al. Hsp70 promotes Aβ degradation via LAMP2A-mediated lysosomal degradation. Journal of Molecular Neuroscience. 2015. ↩︎
Kampinga HH, Craig EA. The HSP70 chaperone machinery: J proteins as drivers of functional specificity. Nature Reviews Molecular Cell Biology. 2010. ↩︎