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. 2017 Oct 17;8:965. doi: 10.1038/s41467-017-01013-5

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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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Fig. 3 — A close up view of the unmodified dG and 10S (+)-trans-BP-N ²-dG adduct contacts with Rev1. a The template dG in the unmodified complex (PDB ID: 2AQ4)³⁵. The backbone amines of Met685 and Gly686 form direct hydrogen bonds with the base of the dG. Side chains of residues Asp399, Trp417, Lys681 and Gly415 and the backbone amine of Lys681 form water-mediated contacts with the base. b The 10S (+)-trans-BP-N ²-dG contacts with Rev1. The modified dG maintains hydrogen bonds between the N7 and O ⁶ atoms at its “Hoogsteen edge” and the main-chain amides of Met685 and Gly686 of the G loop. However, water-mediated contacts with Asp399, Trp417, Lys681, and Gly415 are lost. A molecule of glycerol (shown in gray) appears to take the place of some of the water molecules observed in the unmodified structure (a)