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• W2783245965 abstract "Gating of the mammalian inward rectifier Kir1.1 at the helix bundle crossing (HBC) by intracellular pH is believed to be mediated by conformational changes in the C-terminal domain (CTD). However, the exact motion of the CTD during Kir gating remains controversial. Crystal structures and single-molecule fluorescence resonance energy transfer of KirBac channels have implied a rigid body rotation and/or a contraction of the CTD as possible triggers for opening of the HBC gate. In our study, we used lanthanide-based resonance energy transfer on single-Cys dimeric constructs of the mammalian renal inward rectifier, Kir1.1b, incorporated into anionic liposomes plus PIP2, to determine unambiguous, state-dependent distances between paired Cys residues on diagonally opposite subunits. Functionality and pH dependence of our proteoliposome channels were verified in separate electrophysiological experiments. The lanthanide-based resonance energy transfer distances measured in closed (pH 6) and open (pH 8) conditions indicated neither expansion nor contraction of the CTD during gating, whereas the HBC gate widened by 8.8 ± 4 Å, from 6.3 ± 2 to 15.1 ± 6 Å, during opening. These results are consistent with a Kir gating model in which rigid body rotation of the large CTD around the permeation axis is correlated with opening of the HBC hydrophobic gate, allowing permeation of a 7 Å hydrated K ion." @default.
• W2783245965 created "2018-01-26" @default.
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• W2783245965 date "2018-01-01" @default.
• W2783245965 modified "2023-10-18" @default.
• W2783245965 title "LRET Determination of Molecular Distances during pH Gating of the Mammalian Inward Rectifier Kir1.1b" @default.
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• W2783245965 doi "https://doi.org/10.1016/j.bpj.2017.10.044" @default.
• W2783245965 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5773755" @default.
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