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. 2018 Aug 14;8:12143. doi: 10.1038/s41598-018-30547-x

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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 rifamycin ADP-ribosyltransferase (Arr). (a) A structure of rifampin. The aliphatic ansa chain and the site of modification by ADP-ribosyltransferase is colored in blue and red, respectively. (b) Two substrate-binding pockets depicted in the structure of rifamycin ADP-ribosyltransferase from arr-ms (PDB 2HW2). The variable X residue in M[R|K][D|E]XL motif is highlighted with a red arrow.