Enables L-proline transmembrane transporter activity. Acts upstream of or within proline transmembrane transport. Predicted to be located in membrane. Predicted to be integral component of membrane. Predicted to be integral component of plasma membrane. Is expressed in brain; early conceptus; metanephros; and secondary oocyte. Orthologous to human SLC6A7 (solute carrier family 6 member 7). [provided by Alliance of Genome Resources, Apr 2022]