2W78: Structures of P. aeruginosa FpvA bound to heterologous pyoverdines: FpvA-Pvd(ATCC13535)-Fe complex

Citation:
Abstract
The first step in the specific uptake of iron via siderophores in Gram-negative bacteria is the recognition and binding of a ferric siderophore by its cognate receptor. We investigated the molecular basis of this event through structural and biochemical approaches. FpvA, the pyoverdine-Fe transporter from Pseudomonas aeruginosa ATCC 15692 (PAO1 strain), is able to transport ferric-pyoverdines originating from other species, whereas most fluorescent pseudomonads are only able to use the one they produce among the more than 100 known different pyoverdines. We solved the structure of FpvA bound to non-cognate pyoverdines of high- or low-affinity and found a close correlation between receptor-ligand structure and the measured affinities. The structure of the first amino acid residues of the pyoverdine chain distinguished the high- and low-affinity binders while the C-terminal portion of the pyoverdines, often cyclic, does not appear to contribute extensively to the interaction between the siderophore and its transporter. The specificity of the ferric-pyoverdine binding site of FpvA is conferred by the structural elements common to all ferric-pyoverdines, i.e. the chromophore, iron, and its chelating groups.
PDB ID: 2W78Download
MMDB ID: 79859
PDB Deposition Date: 2008/12/20
Updated in MMDB: 2012/09
Experimental Method:
x-ray diffraction
Resolution: 3  Å
Source Organism:
Similar Structures:
Biological Unit for 2W78: monomeric; determined by author and by software (PISA)
Molecular Components in 2W78
Label Count Molecule
Protein (1 molecule)
1
Ferripyoverdine Receptor(Gene symbol: fpvA)
Molecule annotation
Chemicals (8 molecules)
1
2
2
6
* Click molecule labels to explore molecular sequence information.

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