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. 2013 Feb 15;8(2):e56746. doi: 10.1371/journal.pone.0056746

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© 2013 Saleem et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) External loop movement during Fe recognition. The structure of FrpB F5-1 with Fe bound is shown in red, superimposed on the apoprotein form in green. The locations of Arg293, Arg298 and His573 are shown relative to the bound Fe atom. (B) Change in the conformation of the N-terminus as a result of Fe binding. Part of the β-barrel has been removed, for clarity. Colors used are as for part (A).