Predicted to enable ATPase binding activity. Predicted to be involved in vacuolar acidification. Predicted to act upstream of or within proton transmembrane transport. Predicted to be located in membrane. Predicted to be part of vacuolar proton-transporting V-type ATPase complex. Predicted to be active in plasma membrane. Human ortholog(s) of this gene implicated in autosomal recessive osteopetrosis 1. Orthologous to human TCIRG1 (T cell immune regulator 1, ATPase H+ transporting V0 subunit a3).