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Nat Neurosci. 2000 Oct;3(10):998-1003.

Transport rates of GABA transporters: regulation by the N-terminal domain and syntaxin 1A.

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Department of Neurobiology, CIRC 446, University of Alabama at Birmingham, 1719 Sixth Avenue South, Birmingham, Alabama 35294-0021, USA.


Plasma membrane GABA transporters participate in neural signaling through re-uptake of neurotransmitter. The domains of the transporter that mediate GABA translocation and regulate transport are not well understood. In the present experiments, the N-terminal cytoplasmic domain of the GABA transporter GAT1 regulated substrate transport rates. This domain directly interacted with syntaxin 1A, a SNARE protein involved in both neurotransmitter release and modulation of calcium channels and cystic fibrosis transmembrane regulator (CFTR) chloride channels. The interaction resulted in a decrease in transporter transport rates. These data demonstrate that intracellular domains of the GABA and protein-protein interactions regulate substrate translocation, and identify a direct link between the machinery involved in transmitter release and re-uptake.

[Indexed for MEDLINE]

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