Predicted to enable D-serine transmembrane transporter activity and L-serine transmembrane transporter activity. Acts upstream of or within erythrocyte differentiation and iron ion transport. Located in mitochondrion. Is expressed in several structures, including alimentary system; brain; genitourinary system; immune system; and integumental system. Orthologous to human SFXN1 (sideroflexin 1). [provided by Alliance of Genome Resources, Apr 2022]