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. 1992 Jul;174(13):4401–4409. doi: 10.1128/jb.174.13.4401-4409.1992

Cloning of the outer membrane high-affinity Fe(III)-pyochelin receptor of Pseudomonas aeruginosa.

R G Ankenbauer 1
PMCID: PMC206225  PMID: 1320609

Abstract

Pseudomonas aeruginosa produces the phenolic siderophore pyochelin under iron-limiting conditions. In this study, an Fe(III)-pyochelin transport-negative (Fpt-) strain, IA613, was isolated and characterized. 55Fe(III)-pyochelin transport assays determined that no Fe(III)-pyochelin associated with the Fpt- IA613 cells while a significant amount associated with KCN-poisoned Fpt+ cells. A P. aeruginosa genomic library was constructed in the IncP cosmid pLAFR1. The genomic library was mobilized into IA613, and a recombinant cosmid, pCC41, which complemented the Fpt- phenotype of IA613, was isolated. pCC41 contained a 28-kb insert of P. aeruginosa DNA, and the Fpt(-)-complementing region was localized to a 3.6-kb BamHI-EcoRI fragment by deletion and subcloning of the insert. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis of IA613 revealed that it lacked a 75-kDa outer membrane protein present in Fpt+ strains. IA613 strains bearing plasmid pRML303, which carries the 3.6-kb BamHI-EcoRI fragment of pCC41, expressed the 75-kDa outer membrane protein and demonstrated a 55Fe(III)-pyochelin transport phenotype identical to that of a wild-type Fpt+ strain. Minicell analysis demonstrated that the 3.6-kb BamHI-EcoRI fragment of pCC41 encoded a protein of approximately 75 kDa. The results presented here and in a previous report (D. E. Heinrichs, L. Young, and K. Poole, Infect. Immun. 59:3680-3684, 1991) lead to the conclusion that the 75-kDa outer membrane protein is the high-affinity receptor for Fe(III)-pyochelin in P. aeruginosa.

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Selected References

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