Abstract
Previous work has identified two families of proteins that transport classical neurotransmitters into synaptic vesicles, but the protein responsible for vesicular transport of the principal excitatory transmitter glutamate has remained unknown. We demonstrate that a protein that is unrelated to any known neurotransmitter transporters and that was previously suggested to mediate the Na(+)-dependent uptake of inorganic phosphate across the plasma membrane transports glutamate into synaptic vesicles. In addition, we show that this vesicular glutamate transporter, VGLUT1, exhibits a conductance for chloride that is blocked by glutamate.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid / pharmacology
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Adenosine Triphosphate / metabolism
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Animals
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Biological Transport, Active / drug effects
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Carrier Proteins / genetics
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Carrier Proteins / metabolism*
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Cell Membrane / metabolism
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Chlorides / metabolism
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Glutamic Acid / metabolism*
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Hydrogen-Ion Concentration
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PC12 Cells
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Phosphates / metabolism
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Potassium Chloride / metabolism
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Rats
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Sodium-Phosphate Cotransporter Proteins
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Symporters*
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Synaptic Vesicles / metabolism*
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Transfection
Substances
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Carrier Proteins
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Chlorides
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Phosphates
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Sodium-Phosphate Cotransporter Proteins
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Symporters
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Glutamic Acid
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Potassium Chloride
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Adenosine Triphosphate
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4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid