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. 2023 Jun 9;14:3416. doi: 10.1038/s41467-023-39140-x

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© The Author(s) 2023

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. 4 — a Proposed electron donor binding site in AxqNOR showing weak cryoEM density for ubiquinol (UQ). AxqNOR is colored green with residues lining the site highlighted as sticks, and the ubiquinol molecule is shown as pink sticks. The cryoEM density is contoured to a sigma level of 0.01 and shown as gray mesh. Water molecules and Fe ions are shown in red and orange spheres, respectively. This scheme is used throughout the figure. b HQNO binding site in GsqNOR (PDB: 3AYG). GsqNOR is colored in purple, with residues lining the binding site highlighted as sticks, HQNO molecule is colored in dark purple. c Potential ubiquinol binding site in NmqNOR (PDB: 6L3H). NmqNOR is colored in blue, with residues lining the binding site highlighted as sticks. d Superposition of AxqNOR (green) and NmqNOR (blue) and the potential UQ binding site.