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. 2014 Oct 30;13(18):2812–2820. doi: 10.4161/15384101.2014.950892

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© 2014 Taylor & Francis Group, LLC

This is an Open Access article distributed under the terms of the Creative Commons Attribution-Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted.

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Figure 3. — Summary of the specific Chi-binding interactions in AddB and the AddA nuclease. (A) The Chi-binding sites are superposed for the binary structure (grey) and the Chi-bound structure (coloured by subunit) to show relative changes in the presence of Chi. The site in the ternary complex is not shown as it is identical to the binary structure. The side chains of key residues that interact with Chi are shown as sticks. (B) Close-up view of the key interactions stabilising Chi located on the AddB 1A domain helices χh1 and χh2. Residues D41 and Q42 stretch the top turn of χh1 by interacting with S69 and L595 respectively. R70 and W73 of χh2 stack with 2 of the Chi bases.