Contributes to heterocyclic compound binding activity. Involved in pH reduction; response to lipopolysaccharide; and response to organonitrogen compound. Located in membrane. Used to study obesity. Human ortholog(s) of this gene implicated in atrophic gastritis; autoimmune gastritis; and stomach cancer. Orthologous to human ATP4B (ATPase H+/K+ transporting subunit beta). [provided by Alliance of Genome Resources, Apr 2022]