ATP1B1 Protein

ATP1B1 Protein

Na+/K+ ATPase Beta-1 Subunit

<div class="infobox infobox-protein"> [@functional2005]
<div class="infobox-header">ATP1B1 Protein</div>

Overview

ATP1B1 Protein

Na+/K+ ATPase Beta-1 Subunit

<div class="infobox infobox-protein"> [@functional2005]
<div class="infobox-header">ATP1B1 Protein</div>

Overview

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

• 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:

The 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

Pathway Diagram

The following diagram shows the key molecular relationships involving ATP1B1 Protein discovered through SciDEX knowledge graph analysis: