Electrogenic uptake of γ-aminobutyric acid by a cloned transporter expressed in Xenopus oocytes

Michael P. Kavanaugh, Jeffrey L. Arriza, R. Alan North, Susan G. Amara

Research output: Contribution to journalArticlepeer-review

Abstract

GAT-1, a γ-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 μM). 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.

Original languageEnglish
Pages (from-to)22007-22009
Number of pages3
JournalJournal of Biological Chemistry
Volume267
Issue number31
StatePublished - Nov 5 1992

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