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Pseudomonas aeruginosa secretes the fluorescent siderophore, pyoverdine (PVD), to enable iron acquisition. Epifluorescence microscopy and cellular fractionation were used to investigate the role of an efflux pump, PvdRT-OpmQ, in PVD secretion. Bacteria lacking this efflux pump accumulated PVD, or a fluorescent precursor, in the periplasm, due to their inability to efficiently secrete into the media...
The pyoverdine outer membrane receptor FpvA from Pseudomonas aeruginosa translocates ferric-pyoverdine across the outer membrane via an energy consuming mechanism that involves the inner membrane energy transducing complex of TonB–ExbB–ExbD and the proton motive force. We solved the crystal structure of FpvA loaded with iron-free pyoverdine at 3.6Å resolution. The pyoverdine receptor is folded in...
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