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Journal of Bacteriology, February 2003, p. 1261-1265, Vol. 185, No. 4
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.4.1261-1265.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Pyoverdine-Mediated Regulation of FpvA Synthesis in Pseudomonas aeruginosa: Involvement of a Probable Extracytoplasmic-Function Sigma Factor, FpvI

Gyula Alan Rédly and Keith Poole*

Department of Microbiology and Immunology, Queen's University, Kingston, Ontario, Canada K7L 3N6

Received 1 October 2002/ Accepted 21 November 2002

A search of the pvd pyoverdine biosynthesis locus of Pseudomonas aeruginosa identified an open reading frame, PA2387, whose product exhibited a sequence similar to those of a number of so-called extracytoplasmic- function sigma factors responsible for siderophore-dependent expression of iron-siderophore receptors in Escherichia coli and Pseudomonas putida. Deletion of this gene, dubbed fpvI, compromised pyoverdine-dependent FpvA ferric pyoverdine receptor production and fpvA gene expression, while the cloned gene stimulated fpvA expression. A Fur-binding site was identified immediately upstream of fpvI, consistent with the observed iron-regulated expression of fpvI and fpvA.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Queen's University, Botterell Hall, Room 813, Stuart St., Kingston, Ontario K7L 3N6, Canada. Phone: (613) 533-6677. Fax: (613) 533-6796. E-mail: poolek{at}post.queensu.ca.

Journal of Bacteriology, February 2003, p. 1261-1265, Vol. 185, No. 4
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.4.1261-1265.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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