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• W2329122427 startingPage "3033" @default.
• W2329122427 abstract "2,3-Benzodiazepine derivatives, also known as GYKI compounds, represent a group of the most promising synthetic inhibitors of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors. Here we investigate the mechanism of inhibition of the GluA1 channel opening and the site of inhibition by GYKI 52466 and its N-3 methyl-carbamoyl derivative, which we term as BDZ-f. GluA1 is a key AMPA receptor subunit involved in the brain function. Excessive activity and elevated expression of GluA1, however, has been implicated in a number of neurological disorders. Using a laser-pulse photolysis technique, which provides ∼60 μs resolution, we measured the effect of these inhibitors on the rate of GluA1 channel opening and the amplitude of the glutamate-induced whole-cell current. We found that both compounds inhibit GluA1 channel noncompetitively. Addition of an N-3 methyl-carbamoyl group to the diazepine ring with the azomethine feature (i.e., GYKI 52466) improves the potency of the resulting compound or BDZ-f without changing the site of binding. This site, which we previously termed as the “M” site on the GluA2 AMPA receptor subunit, therefore favorably accommodates an N-3 acylating group. On the basis of the magnitude of the inhibition constants for the same inhibitors but different receptors, the “M” sites on GluA1 and GuA2 are different. Overall, the “M” site or the binding environment on GluA2 accommodates the same compounds better, or the same inhibitors show stronger potency on GluA2, as we have reported previously [Wang et al. Biochemistry (2011) 50, 7284−7293]. However, acylating the N-3 position to occupy the N-3 side pocket of the “M” site can significantly narrow the difference and improve the potency of a resulting compound on GluA1." @default.
• W2329122427 created "2016-06-24" @default.
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• W2329122427 date "2014-05-01" @default.
• W2329122427 modified "2023-09-26" @default.
• W2329122427 title "Mechanism of Inhibition of the GluA1 AMPA Receptor Channel Opening by the 2,3-Benzodiazepine Compound GYKI 52466 and a <i>N</i>-Methyl-Carbamoyl Derivative" @default.
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• W2329122427 doi "https://doi.org/10.1021/bi5002079" @default.
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