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. 2018 May 17;8:7740. doi: 10.1038/s41598-018-25630-2

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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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The solution structure of the PhoSL trimer. (A) The ensemble of the 20 selected structures in a stereo view. (B) Ribbon diagrams of the minimized mean structure where the orientation in the left panel is the same as that in (A). The three monomers are distinguished by different colors. The axis of the rotational symmetry is shown by a dot in left or a horizontal line in right. (C) A triad of Trp32 in the structural core. Blue broken lines indicate the NH–π electrostatic interactions. (D) Two Cys residues in the vicinity. They should form a disulfide bridge under an oxidized condition, as shown by a broken line. These figures were produced by PyMOL ver. 1.8 (Schrödinger, LLC, New York, USA).