title: Strategies developed by the marine bacterium Pseudomonas fluorescens BA3SM1 to resist metals: A proteome analysis.
abstract: A global proteomic evaluation of the response of the marine bacterium Pseudomonas fluorescens BA3SM1 to Cd, Zn and Cu was performed by two dimensional gel electrophoresis followed by mass spectrometry. When stressed with Cd, the most toxic metal for P. fluorescens BA3SM1, cell growth is rapidly affected and the number of proteins up-regulated (sixteen for 0.4 mM Cd) remains low in comparison with results obtained for Zn and Cu (twenty eight for 1.5mM Zn and forty four for 1.5 mM Cu). The changes in protein expression indicate that the cell adapts to metals by inducing essentially seven defense mechanisms: cell aggregation/biofilm formation (Zn=Cu>Cd); modification of envelope properties to increase the extracellular metal biosorption and/or control the uptake of metal (Cu>Zn); metal export (Cd=Zn and probably Cu); responses to oxidative stress (Cu>Zn>Cd); intracellular metal sequestration (Zn=Cu and probably Cd); hydrolysis of abnormally folded proteins (Cd=Cu), and the over-synthesis of proteins inhibited by metal (Cd>Cu>Zn). To the best of our knowledge, this is the first report showing that a marine P. fluorescens is able to acquire a metal-resistant phenotype, making the strain BA3SM1 a promising agent for bioremediation processes.
authors: Microorganismes Métaux et Toxicité, Institut National des Sciences et Techniques de la Mer, Conservatoire National des Arts et Métiers, Cherbourg-Octeville, France. isabelle.poirier@cnam.fr
authors: Isabelle
authors: I
authors: Poirier
authors: Philippe
authors: P
authors: Hammann
authors: Lauriane
authors: L
authors: Kuhn
authors: Martine
authors: M
authors: Bertrand
mesh_terms: D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects*; D008670:Metals / Q000378:metabolism / Q000633:toxicity*; D040901:Proteomics; D011551:Pseudomonas fluorescens / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D014874:Water Pollutants, Chemical / Q000378:metabolism / Q000633:toxicity*
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical