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              <p>The Pseudomonas aeruginosa FpvA receptor is a TonB-dependent outer membrane transport protein that catalyzes uptake of ferric pyoverdin across the outer membrane. Surprisingly, FpvA expressed in P. aeruginosa grown in an iron-deficient medium copurifies with a ligand X that we have characterized by UV, fluorescence, and mass spectrometry as being iron-free pyoverdin (apo-PaA). PaA was absent from FpvA purified from a PaA-deficient P. aeruginosa strain. The properties of ligand binding in vitro revealed very similar affinities of apo-PaA and ferric-PaA to FpvA. Fluorescence resonance energy transfer was used to study in vitro the formation of the FpvA-PaA-Fe complex in the presence of PaA-Fe or citrate-Fe. The circular dichroism spectrum of FpvA indicated a 57% beta-structure content typical of porins and in agreement with the 3D structures of the siderophore receptors FhuA and FepA. In the absence of the protease's inhibitors, a truncated form of FpvA lacking 87 amino acids at its N-terminus was purified. This truncated form still bound PaA, and its beta-sheet content was conserved. This N-terminal region displays significant homology to the N-terminal periplasmic extensions of FecA from Escherichia coli and PupB from Pseudomonas putida, which were previously shown to be involved in signal transduction. This suggests a similar function for FpvA. The mechanism of iron transport in P. aeruginosa via the pyoverdin pathway is discussed in the light of all these new findings.</p>
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              <addrLine>CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE3 rue Michel-Ange75794 PARIS CEDEX 16 - France</addrLine>
              <country key="FR"/>
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        <org type="institution" xml:id="struct-3557" status="VALID">
          <orgName>Queen's University [Kingston, Canada]</orgName>
          <desc>
            <address>
              <addrLine>99 University Ave, Kingston, ON K7L 3N6</addrLine>
              <country key="CA"/>
            </address>
            <ref type="url">http://www.queensu.ca</ref>
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