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. 2016 Oct 4;16:231. doi: 10.1186/s12866-016-0850-0

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Overall structure of cdPadR1. a Ribbon representation of cdPadR1 monomer with a rainbow color gradient from the N-terminus (blue) to the C-terminus (red). Alpha helices and β-sheets are labeled numerically. The winged helix-turn-helix (wHTH) DNA binding domain is indicated. b The cdPadR1 structure is shown perpendicular to the two-fold axis of symmetry with the DNA recognition helices indicated (α3/α3′). The dimer mate is shown in gray. Distance between α3/α3′ was estimated in PyMOL [22]. Another view is shown after a 90° forward rotation which results in a view along the two-fold axis facing α4/α4′ with the conserved W residue (sticks)