Predicted to enable proton transmembrane transporter activity. Predicted to be involved in proton transmembrane transport. Predicted to be located in endosome. Predicted to be integral component of membrane. Predicted to be part of proton-transporting V-type ATPase, V0 domain. Orthologous to human ATP6V0B (ATPase H+ transporting V0 subunit b). [provided by Alliance of Genome Resources, Apr 2022]