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. 2014 Apr 21;9(4):e95808. doi: 10.1371/journal.pone.0095808

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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A) Crystal structures of an apo iq-mEmerald (green) and a nickel-bound iq-mEmerald (orange). Two histidines (H202 & H204) that are making contact with the nickel ion are indicated. B) Comparison of the metal-binding site between apo (green) and nickel-bound (orange) structures. C) Comparison of the metal-binding site between apo (green) and zinc-bound (blue) structures. D–F) Top view of iq-mEmerald (from top to bottom: apo (green), nickel-bound (orange) and zinc-bound (blue). The distance from the nickel ion to the mEmerald fluorophore is measured between 10.8 and 20.3 Å. The corresponding distance in the zinc-bound structure is between 9.4 and 18.3 Å.