GABA_transporter_type_2
GABA transporter 2 (GAT2; SLC6A13) also known as sodium- and chloride-dependent GABA transporter 2 is one of four GABA transporters, GAT1 (SLC6A1), GAT2 (SLC6A13), GAT3 (SLC6A11) and BGT1 (SLC6A12).[1] Note that GAT2 is different from BGT1 despite the fact that the latter transporter is sometimes referred at as (mouse) GAT-2.
All these transporters are highly hydrophobic proteins with 12 transmembrane segments, extracellular glycosylation sites, and intracellular consensus sites for phosphorylation, and there is over 50% amino acid homology between each of them. Each binds GABA with varying affinities with BGT1 having the lowest affinity and GAT3 the highest. GAT2 (SLC6A13) is predominantly expressed in hepatocytes in the liver, but is also found in proximal tubules in the kidney as well as in the leptomeninges and in some blood vessels in the brain.[2]