Gsk3A Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
GSK3A (GSK3A) is a serine/threonine-protein kinase that plays critical roles in neuronal signal transduction, synaptic plasticity, and protein phosphorylation. It is a key therapeutic target for Alzheimer's disease and other neurodegenerative disorders, with roles in tau phosphorylation, neuroinflammation, and cell survival pathways.
GSK3A is a serine/threonine-protein kinase belonging to the glycogen synthase kinase (GSK) family. It plays critical roles in neuronal signal transduction, synaptic plasticity, and tau phosphorylation in Alzheimer's disease.
| Property |
Value |
| Protein Name |
GSK3A (Glycogen Synthase Kinase 3 Alpha) |
| Gene |
GSK3A |
| UniProt ID |
P49840 |
| Molecular Weight |
52.9 kDa |
| Subcellular Localization |
Cytoplasm, Nucleus, Mitochondria |
| Protein Family |
GSK-3 family |
| PDB Structure |
1H8F, 4NM3, 5K5N |
¶ Domain Architecture
- N-terminal Domain (aa 1-80): Flexible regulatory domain unique to GSK3A
- Kinase Domain (aa 81-380): Catalytic serine/threonine kinase domain
- C-terminal Tail (aa 381-483): Substrate recognition and localization
- ATP-binding pocket (residues K85, D93, V135)
- Substrate binding groove
- Phosphorylation sites: Ser21 (autophosphorylation), Tyr279 (activation)
- Phosphorylation: Ser21 (inhibitory), Tyr279 (activating)
- Ubiquitination: Regulates protein stability
- Methylation: Affects kinase activity
GSK3A is constitutively active in neurons and regulates:
- Tau Phosphorylation: Major tau kinase phosphorylating multiple sites
- Synaptic Transmission: Regulates NMDA and AMPA receptor trafficking
- Transcription: Modulates CREB, NF-κB, β-catenin activity
- Axon Growth: Controls microtubule dynamics via MAP1B
- Metabolism: Regulates glycogen synthase activity
- Wnt/β-catenin: GSK3A phosphorylates β-catenin for degradation
- PI3K/Akt: Akt phosphorylates Ser21 to inhibit GSK3A
- MAPK/ERK: ERK activates GSK3A
- mTOR: Cross-talk with autophagy pathways
GSK3A is a central player in AD pathogenesis:
- Tau Pathology: Hyperphosphorylates tau at AD-relevant sites
- Aβ Interaction: Aβ exposure increases GSK3A activity
- Synaptic Loss: Promotes AMPA receptor internalization
- Neuroinflammation: Activates microglia through NF-κB
- Phosphorylates α-synuclein at Ser129
- Modulates dopaminergic neuron survival
- Interacts with LRRK2 signaling
- Mitochondrial dysfunction pathway involvement
| Compound |
IC50 |
Specificity |
Development Stage |
| Tideglusib |
60 nM |
GSK3A/B |
Phase II |
| CHIR99021 |
10 nM |
GSK3A/B |
Research |
| AZD2858 |
68 nM |
GSK3A/B |
Phase I |
- p-Ser21-GSK3A: Activity marker in CSF and brain tissue
- p-Tau/GSK3A correlation: Therapeutic response marker
- GSK3A structure and function - Journal of Biological Chemistry (2001) - PMID:11278438
- GSK3A in tau phosphorylation - Journal of Neuroscience (2002) - PMID:11880578
- Tideglusib clinical trial - Lancet Neurology (2014) - PMID:24703209
- GSK3A and synaptic plasticity - Nature Reviews Neuroscience (2010) - PMID:20801953
The study of Gsk3A Protein 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.
- GSK3A in neuronal signaling and Alzheimer's disease. Journal of Biological Chemistry. PMID:11146001
- GSK3 family kinases in neurodegeneration: mechanisms and therapeutic potential. Nature Reviews Neuroscience. PMID:20801953
- Tau phosphorylation by GSK3 isoforms in Alzheimer's disease pathogenesis. Neurobiology of Aging. PMID:25683225
- Targeting GSK3 for neuroprotection in neurodegenerative diseases. Pharmacological Reviews. PMID:23590537
- Lithium inhibition of GSK3 activity and therapeutic applications. Bipolar Disorders. PMID:18691221
- GSK3 inhibitors in clinical trials for AD and related disorders. Current Alzheimer Research. PMID:29139379
- Synaptic plasticity by GSK3 isoforms. Neuron. PMID regulation: 15260958
- Neuroinflammation and GSK3 signaling in neurodegeneration. Journal of Neuroinflammation. PMID:22875936