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• W4282947248 abstract "In neurosecretion, allosteric communication between voltage sensors and Ca2+ binding in BK channels is crucially involved in damping excitatory stimuli. Nevertheless, the voltage-sensing mechanism of BK channels is still under debate. Here, based on gating current measurements, we demonstrate that two arginines in the transmembrane segment S4 (R210 and R213) function as the BK gating charges. Significantly, the energy landscape of the gating particles is electrostatically tuned by a network of salt bridges contained in the voltage sensor domain (VSD). Molecular dynamics simulations and proton transport experiments in the hyperpolarization-activated R210H mutant suggest that the electric field drops off within a narrow septum whose boundaries are defined by the gating charges. Unlike Kv channels, the charge movement in BK appears to be limited to a small displacement of the guanidinium moieties of R210 and R213, without significant movement of the S4." @default.
• W4282947248 created "2022-06-16" @default.
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• W4282947248 date "2022-06-15" @default.
• W4282947248 modified "2023-10-14" @default.
• W4282947248 title "Mechanism of voltage sensing in Ca ²⁺ - and voltage-activated K ⁺ (BK) channels" @default.
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• W4282947248 doi "https://doi.org/10.1073/pnas.2204620119" @default.
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