Hsp90Ab1 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| HSP90AB1 - Heat Shock Protein 90 Alpha Family Class B Member 1 |
|---|
| Full Name | Heat Shock Protein 90 Alpha Family Class B Member 1 |
| Chromosomal Location | 6p21.1 |
| NCBI Gene ID | 3326 |
| Ensembl ID | ENSG00000096384 |
| UniProt ID | P08238 |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, ALS |
The HSP90AB1 gene encodes Hsp90β, the beta isoform of the 90 kDa heat shock protein. Hsp90AB1 is the constitutive isoform and works alongside Hsp90AA1 in protein quality control.
Hsp90AB1 functions as a molecular chaperone:
- Protein folding: Assists folding of client proteins
- Complex assembly: Facilitates multi-protein complex formation
- Quality control: Targets misfolded proteins for degradation
- Stress protection: Cellular stress response
- Signal transduction: Maintains signaling protein function
Hsp90AB1 domains:
- N-terminal ATPase domain: ATP binding and hydrolysis
- Middle domain: Client protein binding
- C-terminal dimerization domain: Homodimer formation
Hsp90AB1 is:
- Constitutively expressed at high levels
- Expressed in all tissues including brain
- Less stress-inducible than Hsp90AA1
- Stabilizes tau protein
- Affects Aβ metabolism
- Therapeutic target
- α-synuclein interactions
- Mitochondrial protein quality control
- Stabilizes mutant SOD1
- FUS and TDP-43 quality control
- Therapeutic targeting
- Neckers L, Workman P. Hsp90 molecular chaperone/anabolic target. J Clin Oncol. 2012;30(5):541-550. PMID:22215752
Hsp90AB1 (Hsp90β) plays significant roles in neurodegenerative disease pathogenesis:
- Stabilizes mutant tau isoforms, promoting aggregation
- Co-chaperones (Aha1, p23) enhance Hsp90 activity
- Hsp90 inhibitors promote tau clearance
- Hsp90 levels increase in AD brain
- Protects α-synuclein from aggregation
- Hsp90 inhibitors reduce α-synuclein toxicity
- Involved in LRRK2 protein quality control
- Protects dopaminergic neurons from stress
- Mutant SOD1 requires Hsp90 for stability
- Hsp90 inhibitors accelerate mutant SOD1 clearance
- TDP-43 pathology involves Hsp90
- Hsp90 co-chaperones are therapeutic targets
- Hsp90AB1 interacts with mutant huntingtin
- Hsp90 inhibitors reduce mHTT aggregation
- Hsp90-based therapies being explored
| Approach |
Mechanism |
Status |
| Geldanamycin derivatives |
Hsp90 ATPase inhibitor |
Preclinical |
| 17-DMAG (alvespimycin) |
Hsp90 inhibitor |
Phase I trials |
| 17-AAG (tanespimycin) |
Hsp90 inhibitor |
Research |
| Ganetespib |
Synthetic Hsp90 inhibitor |
Research |
| Hsp90 co-chaperone modulators |
Indirect inhibition |
Research |
- Hsp90ab1 knockout mice: Embryonic lethal - essential for development
- Conditional knockout models: Neuron-specific deletion shows vulnerability
- Transgenic models: Overexpression protects against neurodegeneration
- C. elegans models: Alpha-synuclein aggregation studies
Current research focuses on:
- Developing blood-brain barrier permeable Hsp90 inhibitors
- Selective targeting of Hsp90 isoforms
- Combination therapies with other chaperones
- Biomarker development using Hsp90 levels
- Gene therapy approaches
The study of Hsp90Ab1 Gene 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.
HSP90AB1 (Heat Shock Protein 90 Beta Family Member 1), also known as Hsp90β, is the constitutively expressed isoform of Hsp90. It shares ~86% sequence identity with Hsp90α and has overlapping but distinct functions:
- Constitutive expression: Always present in cells, upregulated during stress
- Protein quality control: Prevents aggregation of misfolded proteins
- Cellular protection: Against heat, oxidative stress, and proteotoxic insults
- Client proteins: Similar to Hsp90α including kinases and transcription factors
HSP90AB1 is particularly important for:
- Secretory pathway: Associated with protein folding in ER and Golgi
- Cytoskeletal organization: Interacts with actin and tubulin
- Immune function: Involved in immunoglobulin folding and assembly
- Alzheimer's disease: Hsp90β levels correlate with Aβ pathology
- Parkinson's disease: Modulates α-synuclein aggregation and toxicity
- ALS: Chaperone activity affected in SOD1 and FUS mutations
- Neuroprotection: Hsp90AB1 induction is neuroprotective in various models