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.
Subcellular locations: Lysosome membrane
Exhibits a punctated pattern in the cytoplasm, which partially ovelaps with lysosomes.
Expressed in skin fibroblasts.