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. 2017 Jul 21;7:6177. doi: 10.1038/s41598-017-05997-4

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© The Author(s) 2017

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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Interaction of Blm-pep with yeast 20S proteasome. (A) General localization of Blm-pep binding site between subunits α5 and α6 and detailed interactions guiding Blm-pep binding (blow-up). (B) Electron density defining Blm-pep fragment included in the model (2Fo-Fc omit map contoured at 1σ level). (C) Comparison of the binding modes of Blm-pep (green) and Blm10 (blue) at the surface of yeast 20S proteasome (the difference in interaction of both activators with Q60 is highlighted).