ATP1B1 Protein
Na+/K+ ATPase Beta-1 Subunit
<div class="infobox infobox-protein"> [@functional2005]
<div class="infobox-header">ATP1B1 Protein</div>
Overview
flowchart TD
ATP1B1["ATP1B1"] -->|"therapeutic target"| Tumor["Tumor"]
ATP1B1["ATP1B1"] -->|"activates"| Breast_Cancer["Breast Cancer"]
ATP1B1["ATP1B1"] -->|"activates"| Cancer["Cancer"]
ATP1B1["ATP1B1"] -->|"activates"| Als["Als"]
ATP1B1["ATP1B1"] -->|"interacts with"| ATP1B3["ATP1B3"]
ATP1B1["ATP1B1"] -->|"interacts with"| ABCB1["ABCB1"]
ATP1B1["ATP1B1"] -->|"activates"| GENES["GENES"]
ATP1B1["ATP1B1"] -->|"activates"| AUTOPHAGY["AUTOPHAGY"]
ATP1B1["ATP1B1"] -->|"activates"| Drug_Resistance["Drug Resistance"]
ATP1B1["ATP1B1"] -->|"therapeutic target"| Chemoresistance["Chemoresistance"]
ATP1B1["ATP1B1"] -->|"activates"| Multidrug_Resistance["Multidrug Resistance"]
IREB2["IREB2"] -->|"interacts with"| ATP1B1["ATP1B1"]
DNAJA1["DNAJA1"] -->|"interacts with"| ATP1B1["ATP1B1"]
TFEB["TFEB"] -->|"activates"| ATP1B1["ATP1B1"]
style ATP1B1 fill:#4fc3f7,stroke:#333,color:#000
...ATP1B1 Protein
Na+/K+ ATPase Beta-1 Subunit
<div class="infobox infobox-protein"> [@functional2005]
<div class="infobox-header">ATP1B1 Protein</div>
Overview
Mermaid diagram (expand to render)
ATP1B1 Protein is a protein encoded by the [ATP1B1](/genes/atp1b1) gene. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
[@regulation2019]
<table> [@calmodulin]
<tr><th>Protein Name</th><td>Na+/K+ ATPase Beta-1 Subunit</td></tr>
<tr><th>Gene</th><td>[ATP1B1](/genes/atp1b1)</td></tr>
<tr><th>UniProt ID</th><td>[P05026](https://www.uniprot.org/uniprot/P05026)</td></tr>
<tr><th>PDB Structures</th><td>[3A3Y](https://www.rcsb.org/structure/3A3Y), [4XCU](https://www.rcsb.org/structure/4XCU)</td></tr>
<tr><th>Molecular Weight</th><td>~35 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Plasma membrane</td></tr>
<tr><th>Protein Family</th><td>Na+/K+ ATPase beta subunit family</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/breast-cancer" style="color:#ef9a9a">Breast Cancer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">20 edges</a></td>
</tr>
</table>
</div>
Structure
The Na+/K+ ATPase beta subunit is a type II membrane protein with:
- Single transmembrane helix anchoring the subunit in the membrane
- Large extracellular domain (~270 amino acids) with multiple disulfide bonds
- N-glycosylation sites important for proper folding and trafficking
- Three conserved cysteine pairs forming disulfide bonds for stability
The beta subunit is essential for:
- Proper folding and assembly of the alpha subunit
- Targeting the pump complex to the plasma membrane
- Modulating kinetic properties of the pump
- Cell adhesion properties via homotypic interactions
Normal Function in the Nervous System
In the nervous system, ATP1B1 (the major neuronal beta subunit) plays critical roles:
Pump assembly and stability: Essential for functional Na+/K+ ATPase complex formation
Neuronal polarity: Differential beta subunit expression contributes to neuronal polarity
Synaptic function: Regulates ion gradients crucial for synaptic transmission
Glial function: Astrocyte-specific expression supports potassium buffering
Development: Regulates neurite outgrowth and neuronal differentiationThe beta-1 subunit is the predominant isoform in the brain, though other isoforms (ATP1B2, ATP1B3, ATP1B4) show tissue-specific expression.
Role in Neurodegeneration
Alzheimer's Disease (AD)
- Neuronal energy failure: Loss of beta-1 subunit compromises pump function
- Amyloid interaction: [Aβ](/proteins/amyloid-beta) affects Na+/K+ ATPase through beta subunit disruption
- Synaptic dysfunction: Impaired ion gradients affect synaptic plasticity
- Therapeutic relevance: Preserving beta subunit function may protect against Aβ toxicity
Parkinson's Disease (PD)
- Dopaminergic neuron vulnerability: Motor [neurons](/entities/neurons) have high metabolic demands
- [Alpha-synuclein](/proteins/alpha-synuclein) toxicity: PD-linked proteins may disrupt pump function
- Mitochondrial interactions: Energy failure compounds mitochondrial dysfunction
Stroke and Ischemia
- Ischemic vulnerability: Beta subunit degradation accompanies ATPase dysfunction
- Therapeutic potential: Protecting pump complex integrity may improve outcomes
Retinitis Pigmentosa
- ATP1B3 mutations: Linked to recessive RP in certain populations
- Photoreceptor degeneration: Ion gradient failure contributes to photoreceptor death
Therapeutic Targeting
Drug Development
- Assembly modulators: Compounds enhancing beta-alpha subunit interaction
- Protective strategies: Preventing beta subunit degradation in neurodegeneration
- Gene therapy: AAV-mediated delivery of functional beta subunits
Research Directions
- Biomarkers: Beta subunit levels in CSF as potential neurodegeneration markers
- Mechanism studies: Understanding beta subunit regulation in disease contexts
Protein Interactions
| Interactor | Function | Reference |
|------------|----------|-----------|
| ATP1A1 | Alpha-1 subunit - core catalytic subunit | [1](https://doi.org/10.1074/jbc.M110.186171) |
| ATP1A2 | Alpha-2 subunit (neuronal) | [2](https://doi.org/10.1111/j.1471-4159.2005.0342.x) |
| FXYD proteins | Regulatory subunits modulating activity | [3](https://doi.org/10.1016/j.bbamcr.2019.06.008) |
| Calmodulin | Calcium-dependent regulation | [4](https://doi.org/10.1074/jbc.M112.445064) |
See Also
- [ATP1B1 Gene](/genes/atp1b1)
External Links
- [UniProt: P05026](https://www.uniprot.org/uniprot/P05026)
- [PDB structures](https://www.rcsb.org/search?q=uniprot:P05026)
- [GeneCards: ATP1B1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=ATP1B1)
References
[Unknown, Na/K-ATPase assembles and stabilizes the alpha-beta heterodimer (n.d.)](https://doi.org/10.1074/jbc.M110.186171)
[Unknown, Functional properties of neuronal Na/K-ATPase (2005)](https://doi.org/10.1111/j.1471-4159.2005.0342.x)
[Unknown, Regulation of Na/K-ATPase by FXYD proteins (2019)](https://doi.org/10.1016/j.bbamcr.2019.06.008)
[Unknown, Calmodulin modulates Na/K-ATPase activity (n.d.)](https://doi.org/10.1074/jbc.M112.445064)Pathway Diagram
The following diagram shows the key molecular relationships involving ATP1B1 Protein discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)