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Potassium-transporting ATPase Alpha Chain
- Molecular classification
- Enzyme, Transporter, P-type ATPase
01
Overview
The potassium-transporting ATPase alpha chain is the catalytic subunit of the H+/K+ ATPase, a P-type ATPase responsible for exchanging hydrogen and potassium ions across cellular membranes. It plays a crucial role in gastric acid secretion (ATP4A) and potassium homeostasis in non-gastric tissues (ATP12A). This enzyme is the target of proton pump inhibitors, a class of drugs used to reduce gastric acid production.
- Other names
- Gastric H(+)/K(+) ATPase subunit alphaProton pumpH(+) PumpH+ Pump
02
Mechanism of action
Inhibition of H+/K+ ATPase activity, reducing gastric acid secretion
03
Biological functions
Ion transportAcid secretionPotassium homeostasisMaintenance of electrochemical gradients
04
Disease associations
Acid-base imbalanceHypokalemiaHyperkalemiaHypertension (potential involvement)
05
Safety considerations
Potential for long-term side effects with PPI use (e.g., nutrient malabsorption, increased risk of infections)
06
Interacting drugs
Proton pump inhibitors (PPIs)
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