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. 2007 Sep;71(3):413–451. doi: 10.1128/MMBR.00012-07

FIG. 5.

FIG. 5.

Structures of proteins involved in siderophore uptake and iron release. (A) The E. coli OM ferrichrome transporter FhuA in complex with the periplasmic C-terminal TonB domain (with the latter shown in orange) (PDB accession number 2GRX). (B) The periplasmic ferrihydroxamate binding protein FhuD of E. coli cocrystallized with ferricoprogen (coprogen is shown in red, and iron is shown in orange) (PDB accession number 1ESZ). (C) The E. coli enterobactin and diglucosylenterobactin (salmochelin S4) esterase IroE covalently linked to DFP (DFP is shown in red) at the active-site serine (PDB accession number 2GZS). (D) Ferrienterobactin esterase Fes from Shigella flexneri (PDB accession number 2B20).