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. 2018 Jul 4;8:10078. doi: 10.1038/s41598-018-28441-7

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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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1D ¹H spectra of the region 11–21ppm of the complex ¹⁵N/¹³C labelled NS3-NS2Bpro with, Bz-Nle-Lys-Arg-Arg-B(OH)₂, without ¹⁵N/¹³C decoupling at different pH: (A) 5.5, (B) 6.0, (C) 6.5, (D) 7.2, (E) 8.5 all in MES buffer. In (F) pH 8.5 in Tris buffer and (G) unlabeled NS3 in the same complex at pH 8.5 in Tris buffer. The small insert shows N^δ1H of His51 at 19.772 ppm with the one bond J-coupling ¹J_Nδ1H = 52 Hz indicated.