Biochemical identification of a putative glutamate receptor in housefly thoracic membranes |
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Authors: | M T Filbin M E Eldefrawi A T Eldefrawi |
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Institution: | Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA |
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Abstract: | Specific stereoselective binding of 3H]L-glutamate was detected to membranes prepared from housefly thorax to which were added several antiproteases. A single high affinity binding site was detected (KD 0.5 +/- 0.04 microM), but total binding varied from preparation to preparation (5-60 pmoles/mg protein). Specific binding was inhibited by preincubation of the membranes with trypsin, chymotrypsin or protease, or by exposure to 70 degrees C for 5 min. It was also inhibited by several compounds, the most potent being L-glutamate and L-aspartate, followed by L-glutamate diethylester, then D-glutamate, N-methyl-D-aspartate and ibotenate. Quisqualate had little effect, while kainate, proctolin and D-aspartate had none. d-Tubocurarine stimulated 3H]L-glutamate binding. The data suggest that 3H]L-glutamate is binding to an L-glutamate receptor in housefly thoracic muscle membranes. |
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Keywords: | To whom reprint requests should be addressed |
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