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. 2020 Apr 20;3:178. doi: 10.1038/s42003-020-0911-7

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© The Author(s) 2020

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 — The left column shows the ribbon presentation of the structures, whereas the right column shows topology diagrams. The highly conserved helices in the lysozyme-type fold enzymes are depicted in blue and the other core secondary structure elements are shown in cyan. The L-lobe secondary structure elements are shown in green and the R-lobe elements are in yellow. The active site glutamate is marked in red. An orange rectangle marks the region of differences between helices α13 in AtlA-gl, α15 in SagB, and α12 in AtlE.