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J. Bacteriol., Jan 1995, 423-431, Vol 177, No. 2
Copyright © 1995, American Society for Microbiology

Genetic and physical mapping of genes involved in pyoverdin production in Pseudomonas aeruginosa PAO

M Tsuda, H Miyazaki and T Nakazawa
Department of Microbiology, Yamaguchi University School of Medicine, Ube, Japan.

Pseudomonas aeruginosa PAO was mutagenized with Tn1737KH, a type I transcription probe transposon containing a promoterless lacZ (beta- galactosidase) gene, and 24 insertion mutants that did not grow under iron-deficient conditions were isolated. None of the culture supernatants from any mutants contained pyoverdin, a low-molecular- weight siderophore able to sequester ferric iron at very high affinity, and the growth defects of the mutants were all phenotypically recovered by the addition of the culture supernatant from the wild-type strain. These phenotypes led to the inference that all the mutants had defects in the genes (pvd genes) for production of pyoverdin. In some pvd::Tn1737KH mutants, high levels of beta-galactosidase activities were observed, and such activities were drastically reduced by the addition of ferric ion in the culture media, indicating that the expression of at least some pvd genes is regulated at the transcriptional level. Molecular cloning and physical analysis of the chromosomal fragments with Tn1737KH insertions allowed us to allocate all the mutations within a 103-kb region, referred to as the pvd region, that was found to locate at 47 min on the genetic map of PAO. Further physical mapping and Southern analysis showed that there is a 10-kb overlap between the pvd region and the 125-kb catA region described by Zhang and Holloway (C. Zhang and B. W. Holloway, J. Gen. Microbiol. 138:1097-1107, 1992). We could hence illustrate the physical map of the P. aeruginosa chromosome with a size of 218 kb.


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