Predicted to enable cupric reductase activity; ferric-chelate reductase (NADPH) activity; and identical protein binding activity. Involved in positive regulation of apoptotic process. Predicted to be located in multivesicular body. Predicted to be active in endosome and plasma membrane. Orthologous to human STEAP3 (STEAP3 metalloreductase). [provided by Alliance of Genome Resources, Apr 2022]