Vacuolar-type H+-ATPase complex (v-ATPase)

The Vacuolar-type H+-ATPase (v-ATPase) complex is a highly conserved, multi-subunit molecular machine that functions as an ATP-driven proton pump across endomembrane systems, most notably the lysosome (UniProt: P38606). By maintaining an acidic luminal pH, the v-ATPase enables the optimal activity of lysosomal enzymes and facilitates essential processes such as receptor-mediated endocytosis, protein sorting, and autophagy. Beyond its role as a pump, the complex serves as a scaffold for the nutrient-sensing machinery, specifically the mTORC1 pathway, linking cellular metabolic state to growth signals (PMID: 21642988). In pathology, v-ATPase dysregulation is linked to cancer progression, where it acidifies the extracellular space to promote metastasis, and to neurodegenerative diseases where lysosomal dysfunction leads to protein aggregation (PMID: 24441444). While potent inhibitors like bafilomycin exist, their clinical utility is currently limited by toxicity, prompting research into isoform-specific inhibitors to improve therapeutic windows (PMID: 15687169).

Other names

V-type ATPaseVacuolar proton pumpH+-transporting ATPaseV-type H+-transporting ATPaseLysosomal proton pump

Inhibition of ATP-dependent proton translocation across the lysosomal membrane, leading to neutralization of lysosomal pH and disruption of downstream degradative and signaling pathways (PMID: 15687169).