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. 2020 Mar 31;6:17. doi: 10.1038/s41421-020-0150-6

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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. 3 — a REF6 binds to NAC004 dsDNA of different lengths with the same concentration. Positions of free dsDNA and protein-bound DNA are indicated by red and blue arrows, respectively. b The composite simulated-annealing sigma-A-weighted 2mF_o − DF_c (left) and sigma-A-weighted mF_o − DF_c (right) electron density maps are shown at 1.5σ and 2.5σ, respectively. c Ribbon representation of the REF6-DNA structure. REF6 and DNA are in blue and purple color, respectively. d Superposition of the holo-REF6 (green) and the REF6-DNA complex (REF6 in cyan and DNA in purple) structures. The coordinates of the RCZ domains from each were aligned. The last two ZnF domains showed a rotation of ~50° towards the dsDNA.