Involved in aspartate and glutamate uptake. Plays no significant role in the excretion of accumulated glutamate. Disruption of the gene leads to strong reduction of aspartate uptake, but only marginally affects glutamate uptake. Belongs to the amino acid-polyamine-organocation (APC) superfamily. Glutamate:GABA antiporter (GGA) (TC 2.A.3.7) family.