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• W3181036854 abstract "Abstract In addition to the classical voltage-dependent behavior mediated by voltage-sensing-domains (VSD), a growing number of voltage-dependent gating behaviors are being described in ion channels that lack canonical VSDs. A common thread in their mechanism of action is the contribution of the permeating ion to this voltage sensing process. The polymodal K2P K + channel TREK2 responds to membrane voltage through a gating process that is mediated by the interaction of K + with its selectivity filter. Recently, we have found that this action can be modulated by small molecule agonists (e.g. BL1249) which appear to have an electrostatic influence on K + binding within the inner cavity and produce an increase in the single-channel conductance of TREK-2 channels. Here, we directly probed this K + -dependent gating process by recording both macroscopic and single-channel currents of TREK-2 in the presence of high concentrations of internal K + . Surprisingly we found that the channel is inhibited by high internal K + concentrations and that this is mediated by the concomitant increase in ionic-strength. However, we were still able to determine that the increase in single channel conductance in the presence of BL1249 was blunted in high ionic-strength, whilst its activatory effect (on channel open probability) persisted. These effects are consistent with an electrostatic mechanism of action of negatively charged activators such as BL1249 on permeation, but also suggest that their influence on channel gating is more complex." @default.
• W3181036854 created "2021-07-19" @default.
• W3181036854 creator A5044551482 @default.
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• W3181036854 date "2021-07-09" @default.
• W3181036854 modified "2023-09-27" @default.
• W3181036854 title "Effects of Ionic Strength on Gating and Permeation of TREK-2 K2P channels" @default.
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• W3181036854 doi "https://doi.org/10.1101/2021.07.08.451686" @default.
• W3181036854 hasPublicationYear "2021" @default.
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