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• W1990054795 abstract "Potassium channels selectively conduct K(+) ions across cell membranes and have key roles in cell excitability. Their opening and closing can be spontaneous or controlled by membrane voltage or ligand binding. We used Ba(2+) as a probe to determine the location of the ligand-sensitive gate in an inwardly rectifying K(+) channel (Kir6.2). To a K(+) channel, Ba(2+) and K(+) are of similar sizes, but Ba(2+) blocks the pore by binding within the selectivity filter. We found that internal Ba(2+) could still access its binding site when the channel was shut, which indicates that the ligand-sensitive gate lies above the Ba(2+)-block site, and thus within or above the selectivity filter. This is in marked contrast to the voltage-dependent gate of K(V) channels, which is located at the intracellular mouth of the pore." @default.
• W1990054795 created "2016-06-24" @default.
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• W1990054795 date "2003-01-01" @default.
• W1990054795 modified "2023-10-10" @default.
• W1990054795 title "The ligand‐sensitive gate of a potassium channel lies close to the selectivity filter" @default.
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• W1990054795 doi "https://doi.org/10.1038/sj.embor.embor708" @default.
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