Vacuolar H+-ATPase subunit a2 (ATP6V0A2)

Vacuolar H+-ATPase subunit a2 (V-ATPase subunit a2), encoded by the ATP6V0A2 gene, is a critical component of the V0 domain of the vacuolar-type H+-ATPase (V-ATPase) enzyme complex. This multi-subunit enzyme acts as an ATP-dependent proton pump, primarily responsible for the acidification of intracellular compartments such as the Golgi apparatus and endosomes (UniProt P0CAN7). Proper acidification is essential for various cellular processes, including protein glycosylation, membrane trafficking, and the processing of lysosomal enzymes (PubMed: 18157129). Mutations in the ATP6V0A2 gene are the primary cause of autosomal recessive cutis laxa type IIA (ARCL2A), a disorder characterized by skin hyperextensibility and developmental delays due to impaired glycosylation (NIH: Genetic and Rare Diseases Information Center). In addition to its role in genetic disorders, V-ATPase subunit a2 is increasingly recognized as a potential therapeutic target in cancer, where it contributes to the acidic microenvironment that promotes tumor invasion and metastasis (PubMed: 25659501). It also plays a role in the entry of certain viruses into host cells by facilitating endosomal acidification. While potent inhibitors like bafilomycin A1 exist, their clinical utility is limited by high systemic toxicity, making the development of isoform-specific inhibitors a significant therapeutic challenge (PubMed: 22403218).

Other names

ATP6V0A2V-type proton ATPase subunit a isoform 2V-type proton ATPase 116 kDa subunit a isoform 2TJ6WSSARCL2ASTV1J6B7

Inhibition of the V0 domain of the V-ATPase complex to prevent proton translocation and organelle acidification.