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- W4360979487 abstract "Voltage-gated sodium channels are heterotetrameric sodium selective ion channels that play a central role in electrical signaling in excitable cells. With recent advances in structural biology, structures of eukaryotic sodium channels have been captured in several distinct conformations corresponding to different functional states. The secondary structure of the pore lining S6 helices of subunit DI, DII, and DIV has been captured with both short π-helix stretches and in fully α-helical conformations. The relevance of these secondary structure elements for pore gating is not yet understood. Here, we propose that a π helix in at least DI-S6, DIII-S6, and DIV-S6 results in a fully conductive state. On the other hand, the absence of π-helix in either DI-S6 or DIV-S6 yields a sub-conductance state, and its absence from both DI-S6 and DIV-S6 yields a non-conducting state. This work highlights the impact of the presence of a π-helix in the different S6 helices of an expanded pore on pore conductance, thus opening new doors towards reconstructing the entire conformational landscape along the functional cycle of Nav Channels and paving the way to the design of state-dependent modulators." @default.
- W4360979487 created "2023-03-30" @default.
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- W4360979487 date "2023-03-25" @default.
- W4360979487 modified "2023-10-16" @default.
- W4360979487 title "Modulation of pore opening of Eukaryotic sodium channels by π-helices in S6" @default.
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- W4360979487 doi "https://doi.org/10.1101/2023.03.25.534196" @default.
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