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Potassium-transporting ATPase

Molecular classification: Enzyme, P-type ATPase, Hydrolase, Transporter

Overview

Potassium-transporting ATPases are membrane-bound enzymes that use the energy from ATP hydrolysis to transport potassium ions (K⁺) across biological membranes, often in exchange for other cations such as sodium (Na⁺) or protons (H⁺). These enzymes play a crucial role in maintaining cellular ion homeostasis, membrane potential, and overall cell function. Subtypes include Na+/K+-ATPase and H+/K+-ATPase.

Other names: K⁺/H⁺ ATPaseKdp-ATPaseMulti-subunit K⁺ transport ATPase

Mechanism of action

ATP hydrolysis drives conformational changes in the enzyme, leading to the translocation of potassium ions across the membrane. Involves phosphorylation of a conserved aspartate residue.

Biological functions

Potassium ion transportMaintenance of cellular ion homeostasisRegulation of membrane potentialRegulation of cell volumeActive transportProton transport (in H+/K+ ATPase)Acid secretion (in H+/K+ ATPase)Sodium ion transport (in Na+/K+ ATPase)

Disease associations

ArrhythmiasMuscle weakness/paralysisNeurological dysfunctions

Safety considerations

Cardiac glycosides (e.g., digoxin) have a narrow therapeutic windowInhibition of gastric H+/K+ ATPase by PPIs can lead to long-term side effects such as increased risk of infection and nutrient deficiencies

Interacting drugs

Ouabain (Na+/K+ ATPase inhibitor)

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