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• W1566697891 abstract "Summary Pyoverdine (PVD) is the major siderophore produced by Pseudomonas aeruginosa for iron acquisition. PvdRT‐OpmQ is an ATP‐dependent efflux pump involved in the secretion of newly synthesized pyoverdine (PVD) and of PVD that has transported and released its iron into the bacterium from the periplasm into the extracellular medium. This iron uptake pathway also involves an outer membrane transporter, FpvA, for PVD–Fe uptake from the extracellular medium into the periplasm. In binding assays, FpvA bound PVD in complex with many different metals, with affinities from 2.9 nM for PVD–Fe to 13 µM for PVD–Al. Uptake assays with various FpvA and PvdRT‐OpmQ mutants, monitored by inductively coupled plasma‐atomic emission spectrometry (ICP‐AES) for metal detection, and by fluorescence for PVD detection, showed that both metals and PVD accumulated in P. aeruginosa , due to the uptake of these compounds via the FpvA/PVD pathway. Higher levels of accumulation were observed in the absence of PvdRT‐OpmQ expression. Thus, FpvA has a broad metal specificity for both the binding and uptake of PVD–metal complexes, and the PvdRT‐OpmQ efflux pump exports unwanted metals complexed with PVD from the bacterium. This study provides the first evidence of efflux pump involvement in the export of unwanted siderophore–metal complexes and insight into the molecular mechanisms involved controlling the metal selectivity of siderophore‐mediated iron uptake pathways." @default.
• W1566697891 created "2016-06-24" @default.
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• W1566697891 date "2011-12-22" @default.
• W1566697891 modified "2023-10-14" @default.
• W1566697891 title "The PvdRT-OpmQ efflux pump controls the metal selectivity of the iron uptake pathway mediated by the siderophore pyoverdine in Pseudomonas aeruginosa" @default.
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• W1566697891 doi "https://doi.org/10.1111/j.1462-2920.2011.02674.x" @default.
• W1566697891 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22187978" @default.
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