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Potassium-transporting ATPase beta chain
- Molecular classification
- P-type cation transporting ATPase, Transmembrane protein
01
Overview
The potassium-transporting ATPase beta chain (ATP4B) is a subunit of the gastric H+/K+ ATPase, a P-type cation-transporting ATPase. This enzyme complex is essential for acid secretion in the stomach, exchanging intracellular hydrogen ions (H+) for extracellular potassium ions (K+). The beta subunit stabilizes and traffics the functional alpha-beta heterodimer to the plasma membrane. It is targeted by proton pump inhibitors (PPIs) used to treat acid-related gastrointestinal diseases.
- Other names
- H+/K+ ATPase beta subunitGastric H,K-ATPase subunit betaATP4B
02
Mechanism of action
Inhibition of H+/K+ ATPase activity by blocking proton transport.
03
Biological functions
Acid secretionPotassium transportProtein foldingProtein stabilizationProtein trafficking
04
Disease associations
Peptic ulcerGastroesophageal reflux disease
05
Safety considerations
Long-term PPI use associated with increased risk of certain infections (e.g., Clostridium difficile), bone fractures, and vitamin B12 deficiency.
06
Interacting drugs
Proton pump inhibitors (PPIs): Omeprazole, Lansoprazole, Pantoprazole, Rabeprazole, Esomeprazole
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