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. 2000 Nov;124(3):1149–1158. doi: 10.1104/pp.124.3.1149

Figure 6.

Figure 6

Proposed proton-induced conformation change of the iron(III) complex of phytosiderophores. Upon protonation of the amino terminal end of the phytosiderophore, the protonated amine dissociates from the iron(III) cation, pulling with it the attached carboxylate group, converting the hexadentate coordinated structure to a tetradentate structure.