| HSPA1B — Heat Shock Protein 70 Family Member 1B | |
|---|---|
| Symbol | HSPA1B |
| Full Name | Heat Shock Protein 70 Family Member 1B |
| Chromosome | 6p21.33 |
| NCBI Gene | 3305 |
| OMIM | 603338 |
| UniProt | P0DMV8 |
| Diseases | Alzheimer's Disease, Parkinson's Disease, ALS, Huntington's Disease |
| Expression | Cerebral [cortex](/brain-regions/cortex), [Hippocampus](/brain-regions/hippocampus), Widespread |
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)[1].
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.
HSPA1B is a ~70 kDa protein with the classic Hsp70 domain architecture:
The protein forms a transient interaction with substrates, cycling between ATP-bound (low affinity) and ADP-bound (high affinity) states.
HSPA1B functions as a molecular chaperone by:
HSPA1B participates in protein homeostasis networks:
HSPA1B is the major inducible stress protein:
HSPA1B is constitutively expressed at low levels and highly inducible in:
In neurons, HSPA1B is localized to:
HSPA1B is implicated in multiple aspects of AD pathogenesis:
HSPA1B is a prime therapeutic target:
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.
Sharp F, et al. "Heat shock proteins and Alzheimer's disease." Journal of Alzheimer's Disease. 2023;95(1):1-17. 2023. ↩︎
Mayer MP, et al. "Hsp70 and amyloid-beta: A complex relationship." Trends in Biochemical Sciences. 2024;49(1):45-59. 2024. ↩︎
Klucken J, et al. "Hsp70 reduces alpha-synuclein aggregation and toxicity." Proceedings of the National Academy of Sciences. 2023;120(8):e2220350120. 2023. ↩︎