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. 2019 Jul 31;9:11081. doi: 10.1038/s41598-019-47591-w

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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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Crystal structure of bGalE. (A) Overall structure of the biological dimer assembly. One protomer is shown in blue (N domain, residues 1–177 and 236–262) and red (C domain, residues 178–235 and 263–340), and the other symmetry-related protomer is shown in gray. mF_o-DF_c omit map of NAD⁺ (B) and UDP (C) in the NAD⁺ + UDP complex, UDP-Glc (D), and UDP-GlcNAc (E) are shown with a contour level of 3.0σ. NAD⁺ and UDP or UDP-sugar molecules are shown with yellow and green sticks, respectively.