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. 2018 Jan 29;8:1793. doi: 10.1038/s41598-018-20067-z

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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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Surface representation of Mfa1. Mfa1 in surface representation in light green. The proline-rich region is illustrated in dark green. The left insert shows the proline-rich region coordinating the metal ion. The right insert shows Trp554 and the hydrogen bonds between Asp71(OD1 and OD2) and Arg236 (NE and NH2) and between Val556(O) and Arg236(NH1 and NH2). Prolines, metal coordinating residues and residues in the tryptophan pockets are labelled.