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Siderophore production by environmental strains of Salmonella species (1989)

Aznar, Rosa ; Amaro, Carmen ; Alcaide, Elena ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

FEMS microbiology letters 57 (1989), S. 0

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ISSN: 1574-6968

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Abstract Iron uptake mechanisms were investigated in different species of Salmonella isolated from environmental waters. All strains examined were able to grow in the presence of high concentrations (10 mM) of the iron chelator EDDA. All strains excreted phenolate and hydroxamate siderophores, as assessed by bioassays and chemical tests. Bioassays with different indicator strains showed that all Salmonella strains can cross-feed other Enterobacteria, as well as mutants of Salmonella typhimurium deficient in the Enterobactin system, suggesting that this siderophore may be produced by the environmental Salmonella strains. The siderophore aerobactin may also be produced by one of the strains, according to the bioassays results. The same pattern of outer membrane proteins are synthesized under iron-limiting conditions in all species tested, which suggests a similarity of iron uptake systems in many species of Salmonella. This system could be also of great importance in the survival of these bacteria in natural waters, as well as in possible pathogenic mechanisms.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03211.x

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Characterization of R-plasmids in environmental isolates ofsalmonella: Host range and stability (1988)

Aznar, Rosa ; Amaro, Carmen ; Alcaide, Elena

Springer

Current microbiology 17 (1988), S. 173-177

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ISSN: 1432-0991

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract Four environmental isolates ofSalmonella, resistant to several drugs, were examined for plasmid carriage with four different plasmid DNA isolation procedures. The method of Birnboim and Doly gave the best results. Three of the strains possessed a single plasmid with molecular weights of 60 (kanamycin resistant), 44.5 (kanamcin resistant), and 23.4 Md (ampicillin and amoxicillin resistant); the other strain (resistant to tetracycline) harbored two plasmids of 69.8 and 2.2 Md. The 69.8 Md was the one responsible for resistance. All plasmids were fi−, and the 44.5 Md Kcr plasmid synthesized a sex pilus type F. Some properties related to the dissemination of R-plasmids, such as host range, transfer frequencies, and in vitro stability, were studied. Plasmids generally showed a wide host range and high stability in the transconjugants tested. It could be concluded that these plasmids may be widely disseminated in the environment studied.