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. 2020 Apr 2;11:1641. doi: 10.1038/s41467-020-15490-8

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© The Author(s) 2020

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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Fig. 4 — a Hydrophobic interactions mediate the association of the C-terminal helix α3 (yellow) with the central β-sheet (gray) in the SepF protomer. b Overall structure of the unliganded SepF_ΔML homodimer color coded according to temperature factors, from blue (lowest values) to red (highest values). c Deletion of helix α3 in SepF_ΔML,Δα3 promotes the tight interaction between opposite β-sheets from different SepF dimers, leading to the formation of linear SepF polymers (see also Supplementary Fig. 13).