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. 2017 Dec 8;7:17229. doi: 10.1038/s41598-017-17396-w

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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C-terminal helical bundle structural dynamics using finite element (FE) simulation for water-salt (KCl) environment. (A) Side and top views of the closed state and (B) open state of MscL are shown. In the open state (where the pore diameter is D ∼ 30 Å and the membrane thins from 35 Å to ~30 Å) there is outward bending in the upper part of the helical bundle compared to the resting (equilibrated) state, while the rest of the bundle does not change during the channel opening.