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. 1988 Oct;170(10):4865–4873. doi: 10.1128/jb.170.10.4865-4873.1988

Specificity of pyoverdine-mediated iron uptake among fluorescent Pseudomonas strains.

D Hohnadel 1, J M Meyer 1
PMCID: PMC211531  PMID: 3170485

Abstract

Pyoverdine-mediated iron transport was determined for seven fluorescent Pseudomonas strains belonging to different species. For all strains, cell or cell outer membrane and iron(III)-pyoverdine combinations were compared with their homologous counterparts in uptake, binding, and cross-feeding experiments. For four strains (Pseudomonas putida ATCC 12633, Pseudomonas fluorescens W, P. fluorescens ATCC 17400, and Pseudomonas tolaasii NCPPB 2192), the pyoverdine-mediated iron transport appeared to be strictly strain specific; pyoverdine-facilitated iron uptake by iron-starved cells and binding of ferripyoverdine to the purified outer membranes of such cells were efficient only in the case of the homologous systems. Cross-feeding assays, in liquid or solid cultures, resulted, however, especially for P. fluorescens ATCC 17400, in some discrepancies compared with uptake and binding assays, suggesting that growth experiments are the least likely to yield correct information on specificity of the pyoverdine-mediated iron transport. For the three other strains (P. fluorescens ATCC 13525, P. chlororaphis ATCC 9446, and P. aeruginosa ATCC 15692), cross-reactivity was demonstrated by the uptake, binding, and cross-feeding experiments. In an attempt to determine which parts of the iron transport system were responsible for the specificity, the differences in amino acid composition of the pyoverdines, together with the differences observed at the level of the iron-sensitive outer membrane protein pattern of the seven strains, are discussed.

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Selected References

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