Electrogenic proton/amino acid symporter with selectivity for small apolar L-amino acids, their D-enantiomers and selected amino acid derivatives such as 4-aminobutanoate/GABA ( ). May be involved in the efflux from the lysosomal compartment of neutral amino acids resulting from proteolysis (By similarity). May play a role in specifying sites for exocytosis in neurons (By similarity).
Subcellular locations: Cell membrane, Apical cell membrane, Lysosome membrane
In neurons, colocalizes with the exocyst complex in the axonal processes.