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. 2019 May 8;9:7085. doi: 10.1038/s41598-019-42970-9

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© The Author(s) 2019

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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Helix 4-membrane systems. Different allocation of α-helix 4 with respect to the membrane with different charges for the lower hemimembrane (systems 1, 2, 3) and upper hemimembrane (systems 4, 5, 6) according to the DPPC:DPPM ratio as indicated: Systems 1–3, the α-helix 4 is placed in the bilayer mass center. System 4, the upper hemimembrane is forced to cover an initially static α-helix 4. System 5, the helix is placed in the solvent, at electrostatic interaction distance to the polar lipids moieties. System 6, the α-helix 4 is surrounded by the lipids as in system 4, but now with a softer packaging methodology (the same as in system 1).