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• W2776535478 abstract "Kv11.1 (hERG, KCNH2) is a voltage-gated potassium channel crucial in setting the cardiac rhythm and the electrical behaviour of several non-cardiac cell types. Voltage-dependent gating of Kv11.1 can be reconstructed from non-covalently linked voltage sensing and pore modules (split channels), challenging classical views of voltage-dependent channel activation based on a S4-S5 linker acting as a rigid mechanical lever to open the gate. Progressive displacement of the split position from the end to the beginning of the S4-S5 linker induces an increasing negative shift in activation voltage dependence, a reduced z g value and a more negative ΔG 0 for current activation, an almost complete abolition of the activation time course sigmoid shape and a slowing of the voltage-dependent deactivation. Channels disconnected at the S4-S5 linker near the S4 helix show a destabilization of the closed state(s). Furthermore, the isochronal ion current mode shift magnitude is clearly reduced in the different splits. Interestingly, the progressive modifications of voltage dependence activation gating by changing the split position are accompanied by a shift in the voltage-dependent availability to a methanethiosulfonate reagent of a Cys introduced at the upper S4 helix. Our data demonstrate for the first time that alterations in the covalent connection between the voltage sensor and the pore domains impact on the structural reorganizations of the voltage sensor domain. Also, they support the hypothesis that the S4-S5 linker integrates signals coming from other cytoplasmic domains that constitute either an important component or a crucial regulator of the gating machinery in Kv11.1 and other KCNH channels." @default.
• W2776535478 created "2018-01-05" @default.
• W2776535478 creator A5000601811 @default.
• W2776535478 creator A5007585656 @default.
• W2776535478 creator A5062925890 @default.
• W2776535478 date "2017-12-21" @default.
• W2776535478 modified "2023-10-14" @default.
• W2776535478 title "Gating mechanism of Kv11.1 (hERG) K+ channels without covalent connection between voltage sensor and pore domains" @default.
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• W2776535478 doi "https://doi.org/10.1007/s00424-017-2093-9" @default.
• W2776535478 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5805800" @default.
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• W2776535478 hasPublicationYear "2017" @default.
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