The function of Ensembl gene identifier ENSG00000075673 (ATP12A, ATPase H+/K+ transporting non-gastric alpha2 subunit) is as follows. The catalytic subunit of a H(+)/K(+) ATPase and/or Na(+)/K(+) ATPase pump which transports K(+) ions in exchange for Na(+) and/or H(+) ions across the apical membrane of epithelial cells. Uses ATP as an energy source to pump K(+) ions into the cell while transporting Na(+) and/or H(+) ions to the extracellular compartment (PubMed:11341842, PubMed:7485470, PubMed:8853415, PubMed:9774385). Involved in the maintenance of electrolyte homeostasis through K(+) ion absorption in kidney and colon (By similarity). In the airway epithelium, may play a primary role in mucus acidification regulating its viscosity and clearance (PubMed:29391451). {ECO:0000250|UniProtKB:Q9Z1W8, ECO:0000269|PubMed:11341842, ECO:0000269|PubMed:29391451, ECO:0000269|PubMed:7485470, ECO:0000269|PubMed:8853415, ECO:0000269|PubMed:9774385}.