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. 2018 Aug 1;8:11552. doi: 10.1038/s41598-018-29884-8

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© The Author(s) 2018

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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Crystal structure of the flagellin/FliS heterodimer. (a) Domain organization of flagellin. (b) Crystal structure of flagellin/FliS as a cartoon representation in two orientations. flagellin and FliS are shown in orange and blue, respectively. ‘N’ and ‘C’ indicate N- and C-termini, respectively. The disordered N-terminus of flagellin is shown as dashed line. Contact areas between flagellin and FliS are encircled in grey. (c) Electrostatic surface potential of FliS within the contact area of flagellin to FliS. The flagellin-binding pocket is of hydrophobic and polar nature (left side), whereas the opposite site of FliS is highly charged (right side).