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Different Responses of Pyoverdine Genes to Autoinduction in Pseudomonas aeruginosa and the Group Pseudomonas fluorescens-Pseudomonas putida

Unità di Microbiologia Molecolare, I.R.C.C.S. "Lazzaro Spallanzani," 00149 Rome,¹ Dipartimento di Biologia, Università di Roma Tre, 00146 Rome, Italy²

Received 21 February 2002/ Accepted 8 May 2002

We investigated the regulation of the psbA and pvdA pyoverdine biosynthesis genes, which encode the L-ornithine N⁵-oxygenase homologues in Pseudomonas strain B10 and Pseudomonas aeruginosa PAO1, respectively. We demonstrate that pyoverdine_B10, as the end product of its biosynthetic pathway, is a key participant of the control circuit regulating its own production in Pseudomonas strain B10. In P. aeruginosa PAO1, however, pyoverdine_PAO1 has no apparent role in the positive regulation of the pvdA gene.

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