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. 2018 Feb 1;8:2195. doi: 10.1038/s41598-018-20634-4

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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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Structural analysis of RelP. (a) Domain architecture of the (p)ppGpp synthetases BsRel, BsRelQ and SaRelP drawn to scale. The inset depicts amino acid similarities between RelP and RelQ proteins from Bacillus subtilis (Bs) and Staphylococcus aureus (Sa). (b) Cartoon representation of the crystal structures of the SaRelP (this study) and BsRelQ (PDB: 5DEC³³) homotetramers. Each monomer (α-δ) is rainbow-colored from its N- to its C-terminus. (c) The (p)ppGpp synthetase monomers of SaRelP (left; this study), BsRelQ (middle; PDB: 5DEC³³) and their superimposition (right) coloured in rainbow from N- to C-terminus.