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. 2019 Nov 28;2:440. doi: 10.1038/s42003-019-0686-x

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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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Fig. 1 — Structure of ToxT_ENV256–unsaturated fatty acid (UFA) complex. a Asymmetric unit of the ToxT_ENV256 (PDB 6P7R) structure aligned with the structure of ToxT_EPI (3GBG). ToxT_ENV256 is colored from the N-terminus to the C-terminus in dark blue to red. ToxT_EPI is colored gray. b Close-up of the UFA-binding pocket of ToxT_ENV256 showing the sidechain interactions with the carboxylate head. Electron density is shown as the 2Fo-Fc map contoured to 1.5 σ. c Structural alignment of the regulatory domain of UFA-bound ToxT_ENV256 to the AraC regulatory domain dimer (PDB 2ARA). AraC is colored gray, the regulatory domain of UFA-bound ToxT_ENV256 is colored blue to green. d Structural alignment of the DNA-binding domain of UFA-bound ToxT_ENV256 to MarA in complex with DNA (PDB 1BL0). MarA is colored gray, the DNA-binding domain of UFA-bound ToxT_ENV256 is colored yellow to red.