Pseudomonas aeruginosa is a versatile environmental microorganism that also causes life-threatening opportunistic infections. At the root of this bacterium's ability to survive in such diverse environments is its large suite of iron acquisition systems. More recently, studies have highlighted the ability of P. aeruginosa to compete with other organisms for this essential metallonutrient. This minireview provides an overview of the iron acquisition systems used by P. aeruginosa, with an emphasis on how these systems contribute to fitness in polymicrobial environments. We also provide an evolutionary perspective of how these systems were selected for in the native habitats of the Pseudomonads, while also highlighting factors that are unique to P. aeruginosa.
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Evidence of dissemination of a -type integrative and conjugative element to , mediating acquisition of and other resistance determinants.
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Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.
A strain positive for the metallo-beta-lactamase gene and resistant to trimethoprim-sulfamethoxazole was unexpectedly isolated from a surveillance rectal swab. The characterization of the strain revealed carriage of a 91 kb integrative and conjugative element (ICE) harboring several resistance determinants [, , , , ∆, , and ], closely related with a group of -type ICEs widespread among and other pseudomonads. Results highlighted the possible spreading of similar elements to , mediating the acquisition of relevant resistances.
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