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FhuA protein facilitates ligand-gated transport of ferrichrome-bound iron across Escherichia coli outer membranes. X-ray analysis at 2.7 Å resolution reveals two distinct conformations in the presence and absence of ferrichrome. The monomeric protein consists of a hollow, 22-stranded, antiparallel β barrel (residues 160-714), which is obstructed by a plug (residues 19-159). The binding site of ferrichrome,...
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