Enables proline:sodium symporter activity. Involved in leucine transport and proline 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 alimentary system; central nervous system; dorsal root ganglion; metanephros; and sensory organ. Orthologous to human SLC6A15 (solute carrier family 6 member 15). [provided by Alliance of Genome Resources, Apr 2022]