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Pyomelanin is produced by Shewanella algae BrY and affected by exogenous iron

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Melanin production by Shewanella algae BrY occurred during late- and (or) post-exponential growth in lactate basal salts liquid medium supplemented with tyrosine or phenylalanine. The antioxidant ascorbate inhibited melanin production but not production of the melanin precursor homogentisic acid. In the absence of ascorbate, melanin production was inhibited by the 4-hydroxyphenylpyruvate dioxygenase inhibitor sulcotrione and by concentrations of Fe >= 0.38 mmol·L-1. These data support the hypothesis that pigment production by S. algae BrY was a result of the conversion of tyrosine or phenylalanine to homogentisic acid, which was excreted, auto-oxidized, and self-polymerized to form pyomelanin. Pyomelanin production by S. algae BrY may play an important role in the biogeochemical cycling of Fe in the environment.

La production de mélanine par Shewanella algae BrY a eu lieu lors de la phase tardive et (ou) post-exponentielle de croissance dans un milieu liquide LBS (lactate basal salts) supplémenté de tyrosine ou de phénylalanine. Un antioxydant, l’ascorbate, a inhibé la production de mélanine, mais pas celle de l’acide homogentisique, le précurseur de la mélanine. En absence d’ascorbate, la production de mélanine était inhibée par le sulcotrione, un inhibiteur de la 4-hydroxyphénylpyruvate dioxygénase, et par des concentrations de Fe >= 0,38 mmol·L-1. Ces résultats appuient l’hypothèse que la production de pigments par S. algae BrY soit le résultat de la conversion de la tyrosine ou de la phénylalanine en acide homogentisique qui est excrété, auto-oxydé et auto-polymérisé pour former la pyomélanine. La production de pyomélanine par S. algae BrY peut jouer un rôle important dans le recyclage biogéochimique du Fe dans l’environnement.

Document Type: Research Article

Publication date: April 1, 2008

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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