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• W2000749144 abstract "High-affinity desensitization (HAD) by nanomolar agonists was described to shape the ability of P2X₃ receptors for mediating pain sensation. These receptors are activated by micromolar ATP, but nanomolar ATP is sufficient to effectively desensitize them. The mechanism behind HAD is still obscure. It has been suggested ( J Neurosci25<b>:</b>7359-7365, 2005 ) that HAD can happen only if the receptor has previously been activated and desensitized by high agonist concentrations. It was not clear, however, whether the high-affinity site was different from the conventional binding site and which mechanism led to its exposure during desensitization. A subsequent article ( Mol Pharmacol70<b>:</b>373-382, 2006 ) argued that HAD could also occur without preceding desensitization, because even resting receptors expose high-affinity binding sites. To support this hypothesis, a kinetic model was proposed that could reproduce all major phenomena observed experimentally. We attempted to improve this model and used it to simulate the agonist-induced formation of the high-affinity binding site. We collected electrophysiological data using HEK 293 cells expressing human P2X₃ receptors and fitted simulated currents to experimentally acquired currents. A simple allosteric kinetic model in which only triliganded receptors could open failed to reproduce receptor behavior; introduction of an additional diliganded open state was necessary. Simulation with this model gave results that were in good agreement with experimental data. By using simulations and experiments, we analyzed the process of high-affinity binding site formation upon agonist exposure and propose an explanation, which helps to resolve the apparent conflict regarding the mechanism of HAD." @default.
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• W2000749144 date "2007-10-09" @default.
• W2000749144 modified "2023-10-04" @default.
• W2000749144 title "The Unusual State-Dependent Affinity of P2X₃ Receptors Can Be Explained by an Allosteric Two-Open-State Model" @default.
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• W2000749144 doi "https://doi.org/10.1124/mol.107.038901" @default.
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