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. 2019 Jul 18;19:48. doi: 10.1186/s12896-019-0545-3

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Introducing intermolecular disulfide bonds in FliC protofilaments. (Left) Depiction of the helical translations and proposed locations to introduce disulfide bonds between neighboring flagellin protofilaments. Domains N’D0 and N’D1 are colored dark and light blue respectively while C’D0 and C’D1 are orange and red, respectively. (Right) Molecular graphic representation of sites of interest within neighboring protofilament monomers. Insets show a zoomed and rotated view of the amino acid interactions with the specific distances shown: 1) Glu454[Oε1] – Asn5[Nδ1], 2) Asn430[Oδ1] – Asn38[Nδ1], and 3) Gln97[N] – Gln62[Oε1], Gln97[Nε2] – Gln62[Oε1]