Predicted to enable L-alanine transmembrane transporter activity; L-proline transmembrane transporter activity; and L-tryptophan transmembrane transporter activity. Predicted to be involved in amino acid transport. Predicted to act upstream of or within amino acid transport. Predicted to be located in membrane. Predicted to be integral component of membrane. Orthologous to human SLC36A4 (solute carrier family 36 member 4). [provided by Alliance of Genome Resources, Apr 2022]