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. 2007 Dec 6;27(1):277–289. doi: 10.1038/sj.emboj.7601936

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Copyright © 2008, European Molecular Biology Organization

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits distribution, and reproduction in any medium, provided the original author and source are credited. This license does not permit commercial exploitation or the creation of derivative works without specific permission.

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(A) Nucleotide stacked against Tyr115 in subunit B, with 1.0σ2F_o–F_c electron density, calculated by omitting the DNA from the model. (B) 2.5σF_o–F_c electron density, calculated by omitting the DNA from the model. The adenine stacking against Tyr115 in subunit A is shown. (C) A view of the DNA-binding site centered on the dimeric interface, showing the base stacking of Tyr115 of each subunit with nucleotide. Subunit A is depicted in maroon and subunit B in blue, similar to Figure 2A. (D) View of unmodelled 1.0σ2F_o–F_c electron density corresponding to DNA near Phe157. Shown is subunit B, but unmodelled density is also present in subunit A. (E) Hydrogen bond between adenine and Arg187.