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XB-ART-23204
J Biol Chem 1992 Nov 05;26731:22007-9.
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Electrogenic uptake of gamma-aminobutyric acid by a cloned transporter expressed in Xenopus oocytes.

Kavanaugh MP , Arriza JL , North RA , Amara SG .


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GAT-1, a gamma-aminobutyric acid (GABA) transporter cloned from rat brain, was expressed in Xenopus oocytes. Voltage-clamp measurements showed concentration-dependent, inward currents in response to GABA (K0.5 4.7 microM). The transport current required extracellular sodium and chloride ions; the Hill coefficient for chloride was 0.7, and that for sodium was 1.7. Correlation of current and [3H]GABA uptake measurements indicate that flux of one positive charge occurs per molecule of GABA transported. Membrane hyperpolarization from -40 to -100 mV increased the transport current approximately 3-fold. The results indicate that the transport of one molecule of GABA involves the co-transport of two sodium ions and one chloride ion.

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Species referenced: Xenopus laevis
Genes referenced: XB5944457