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. 2019 Dec 9;9:18629. doi: 10.1038/s41598-019-54970-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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IsdB secondary and tertiary structures. (A) Topology of IsdB (PDB code 5vmm). The structure consists of 18 β-strands and 6 α-helices, forming two NEAT domains connected by a flexible linker. (B) 3D cartoon structure of wt IsdB in complex with methemoglobin (MetHb). Hb binding motif and heme binding signature are represented in stick residues. A and B refer, respectively, to the hemoglobin binding motif and to the heme-binding signature.