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Potassium-transporting ATPase alpha chain 1
- Molecular classification
- Enzyme, Transporter, P-type cation transporter, Ion pump
01
Overview
Potassium-transporting ATPase alpha chain 1 is a membrane-bound enzyme subunit crucial for ion transport and cellular homeostasis. It is associated with the gastric H+/K+ ATPase (ATP4A), which acidifies gastric juice, and the Na+/K+ ATPase (ATP1A1), which maintains sodium and potassium gradients across plasma membranes. It is essential for various physiological processes, including nerve impulse transmission, muscle contraction, and osmoregulation. Dysfunctions in the protein are linked to several conditions, including hypertension and neurological disorders. The protein is also a drug target for gastrointestinal diseases like GERD.
- Other names
- ATP4AATP1A1Gastric H+/K+ ATPase alpha chainNa+/K+ ATPase alpha 1 subunit
02
Mechanism of action
Alternating access mechanism powered by phosphorylation/dephosphorylation cycles. Conformational changes between E₁/E₂ states allow selective binding/release/occlusion/translocation of specific cations coupled with hydrolysis/transfer/phosphorylation events.
03
Biological functions
Ion exchangeEstablishes electrochemical gradientsRegulates cell volumeRegulates cell excitabilityAcidification of gastric juiceSodium-coupled transportOsmoregulationNerve impulse transmissionMuscle contraction
04
Disease associations
HypertensionAldosterone-producing adenomasGastroesophageal reflux disease (GERD)Peptic ulcersHelicobacter pylori infectionsOsteoarthritisRheumatoid arthritisCharcot-Marie-Tooth disease
05
Safety considerations
Potential side effects associated with PPI use (e.g., increased risk of infections, nutrient deficiencies)Therapeutic challenges in modulating ATPase activity without disrupting essential cellular functions
06
Interacting drugs
Proton pump inhibitors (PPIs)
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