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. 2017 Nov 16;7:15743. doi: 10.1038/s41598-017-15837-0

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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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Structural alignment of FlgK and FlgE and Model of the FlgK ring with 11 molecules. (A) View of the complete structure of FlgK from C. jejuni. Domain D0, in gray, was obtained by homology modeling (template: 5JXL). Domains D1 and D2, in green, are the structure of FlgK58cj obtained by X-ray crystallography. (B) Structure of FlgE from C. jejuni (PDB id 5JXL). (C) Superposition of FlgK and FlgE from C. jejuni by aligning their D0 domains. (D) View from the distal end and lateral view of a ring of the hook with 4 molecules of FlgE substituted with 4 molecules of FlgK. FlgE molecules are in magenta. FlgK molecules are in green for the part corresponding to FlgKcj58 and in gray for the part corresponding to domain D0 that makes the central region together with domain D0 of FlgE. (E) View from the distal end and lateral view of the refined ring made of 11 molecules of FlgKcj58. Each molecule of FlgKcj58 is colour-coded in a spectral (‘rainbow’) sequence, from the N-terminus in blue to the C-terminus in red. (F) View from the distal end and lateral view the ring, made of FlgKcj58, docked on top of the hook of C. jejuni which surface is colored in gray. (Figure prepared with PyMOL, The PyMOL Molecular Graphic System, Schrödinger, LLC. http://www.schrodinger.com/suites/pymol).