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. 2016 Jun 28;7:1010. doi: 10.3389/fmicb.2016.01010

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Copyright © 2016 Ortiz de Orué Lucana, Hickey, Hensel, Klare, Geremia, Tiufiakova and Torda.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The 3D crystal structure of PduOC:heme. (A, left) An illustration showing the PduOC monomer structure. The heme is indicated at the side chain of His18 that is shown in stick representation. α-helices are shown in turquoise and β-strands in purple. (A, right) Octameric PduOC:heme assembly viewing as viewed down the main C₄ axis. A single PduOC monomer is highlighted in green. (B) Contacts between the three non-redundant monomeric PduOC molecules (chains A, C and D) within the octameric assembly as labeled.