Predicted to enable identical protein binding activity; transmembrane ascorbate ferrireductase activity; and transmembrane monodehydroascorbate reductase activity. Predicted to be involved in ascorbate homeostasis and cellular iron ion homeostasis. Predicted to act upstream of or within response to iron ion. Predicted to be located in apical plasma membrane and brush border membrane. Predicted to be integral component of membrane. Predicted to be active in lysosomal membrane. Orthologous to human CYBRD1 (cytochrome b reductase 1). [provided by Alliance of Genome Resources, Apr 2022]