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Vacuolar-type H⁺‑translocating ATPase (V-ATPase)

Target: V-ATPase
Molecular classification: Enzyme, Transporter, ATP-driven proton pump

Overview

V-type proton ATPases (V-ATPases) are large, multisubunit enzyme complexes that function as ATP-driven proton pumps. They are found in the membranes of various intracellular organelles and, in some specialized cells, at the plasma membrane. Their primary role is to acidify compartments within eukaryotic cells by translocating protons (H⁺ ions) across membranes using energy derived from ATP hydrolysis. Mutations or dysregulation in specific V‑ATPase subunit isoforms have been linked to diseases.

Mechanism of action

Inhibition of V-ATPase activity, preventing proton translocation and subsequent acidification of target compartments.

Biological functions

pH regulationProtein sorting/traffickingNeurotransmitter loadingAcidification of intracellular compartmentsEndocytosis/exocytosisHomeostasis

Disease associations

Renal tubular acidosisOsteopetrosisDiseases involving abnormal acidification or trafficking processes

Safety considerations

Potential for off-target effects due to ubiquitous expression.Disruption of normal cellular pH homeostasis.

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