Predicted to enable D-serine transmembrane transporter activity and L-serine transmembrane transporter activity. Predicted to be involved in D-serine transport; L-serine transport; and serine import into mitochondrion. Predicted to act upstream of or within erythrocyte differentiation and iron ion transport. Predicted to be located in mitochondrion. Predicted to be integral component of mitochondrial inner membrane. Orthologous to human SFXN1 (sideroflexin 1). [provided by Alliance of Genome Resources, Apr 2022]