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. 2020 Jun 12;11:2991. doi: 10.1038/s41467-020-16729-0

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© The Author(s) 2020

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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Fig. 2 — a The monomeric unit of SxtT reveals that the metallocenters are located approximately 45-Å apart. b The trimeric quaternary structures of SxtT (colors) and GxtA (gray) are overlaid with one another. The trimeric arrangement of subunits allows for the close positioning of the metallocenters. c Two residues, Asp161 and Tyr76, which are found at the subunit-subunit interface of both SxtT (top panel) and GxtA (bottom panel, same residue numbering as SxtT) bridge the Rieske cluster to the non-heme iron center. SxtT is shown in purple and cyan and GxtA is gray.