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The effects of different agents similar in structure to glutamate were tested for inhibition of the vesicular uptake of L-glutamate. Kainate and L-homocysteate turned out to be non-competitive inhibitors of the L-glutamate uptake. Kainate was not taken up by the vesicle fraction. The vesicular uptake of gamma-aminobutyric acid (GABA) was also inhibited by kainate and L-homocysteate. Kynurenate, on the other hand, strongly inhibited the uptake of L-glutamate, whereas the uptake of GABA was hardly affected. L-alpha-Aminoadipate and D-glutamate inhibited the uptake of L-glutamate, whereas L- and D-aspartate and L-cysteate only weakly inhibited the uptake of L-glutamate. GABA, glycine, L-serine and taurine did not inhibit the uptake of L-glutamate.
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