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| ATP1B2 Protein |
|---|
| Protein Name | Sodium/potassium-transporting ATPase subunit beta-2 |
| Gene | [ATP1B2](/genes/atp1b2) |
| UniProt ID | [P14415](https://www.uniprot.org/uniprot/P14415) |
| PDB Structure | [5A3K](https://www.rcsb.org/structure/5A3K) |
| Molecular Weight | ~33 kDa |
| Subcellular Localization | Plasma membrane |
| Protein Family | Na+/K+ ATPase beta subunit family |
ATP1B2 Protein is a protein encoded by the ATP1B2 gene. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
ATP1B2 is a beta subunit of the Na+/K+ ATPase complex:
- Single transmembrane domain: Anchors the protein in the plasma membrane
- Extracellular loop: Contains disulfide bonds important for assembly with the alpha subunit
- Intracellular N-terminus: Short cytoplasmic domain involved in regulation
- Glycosylation sites: N-linked glycosylation in the extracellular domain
The beta subunit is essential for proper folding, trafficking, and stability of the Na+/K+ ATPase complex in the plasma membrane.
ATP1B2 is critical for neuronal ion homeostasis:
- Ion gradient maintenance: Partners with ATP1A subunits to establish Na+ and K+ gradients
- Resting membrane potential: Essential for maintaining neuronal resting potential
- Action potential generation: Supports proper action potential firing
- Neurotransmitter uptake: Drives secondary active transport of neurotransmitters
- Synaptic function: Maintains ionic conditions for synaptic transmission
- Astrocyte function: Highly expressed in astrocytes for potassium buffering
In the brain, ATP1B2 is expressed predominantly in neurons and astrocytes, where it maintains the ionic homeostasis essential for proper neurological function.
ATP1B2 dysfunction is implicated in several neurodegenerative conditions:
- Reduced ATP1B2 expression in AD brains correlates with cognitive decline
- Impaired Na+/K+ ATPase activity contributes to excitotoxicity
- Beta-amyloid directly inhibits ATP1B2 function
- Therapeutic targeting of Na+/K+ ATPase shows promise in AD models
- ATP1B2 dysfunction contributes to dopaminergic neuron vulnerability
- Impaired ion homeostasis in PD models involves ATP1B2
- Energy failure in PD involves reduced Na+/K+ ATPase activity
- Altered ATP1B2 expression in ALS motor neurons
- Energy metabolism deficits in ALS involve ion pump dysfunction
- ATP1B2 mutations cause epileptic encephalopathy
- Impaired ionic gradients lead to hyperexcitability
Current therapeutic strategies:
- Na+/K+ ATPase activators: Cardiac glycosides indirectly enhance function
- Gene therapy: AAV-mediated ATP1B2 delivery being explored
- Small molecule stabilizers: Compounds that stabilize the ATP1B2 structure
- Protein replacement: Not yet feasible due to membrane protein complexity
Categories: Proteins | Ion Channel Proteins | Neurodegeneration