Imports 4-aminobutanoate (GABA) into lysosomes. May act as a GABA sensor that regulates mTORC2-dependent INS signaling and gluconeogenesis. The transport mechanism and substrate selectivity remain to be elucidated. . This is the function of SLC7A14 (solute carrier family 7 member 14, Ensembl gene identifier ENSG00000013293).