Amino acid transporter that mediates the uptake of the L-enantiomers of various amino acids, including L-glutamate (Probable). May play a role in promoting fertility (PubMed:30560135). Interacts (via PDZ-binding motif) with nfrl-1 (via PDZ 2 domain); the interaction with nrfl-1 is required to sequester aat-6 to the apical cell membrane of intestinal cells. Co-localizes with nrfl-1 at the apical cell membrane of intestinal cells. Expressed at the apical cell membrane of intestinal cells. Belongs to the amino acid-polyamine-organocation (APC) superfamily.