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Chemical characterization and quantification of siderophores produced by marine and terrestrial aspergilli

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Ten aspergilli (five each from marine and terrestrial habitats) were screened for siderophore production. All test isolates produced siderophores as indicated by a positive reaction in the FeCl3 test, chrome azurol sulphonate assay, and chrome azurol sulphonate agar plate test. Further, the test isolates were compared for their siderophore production potential and chemical characteristics. Examination of the chemical nature of the siderophores revealed that all test isolates produced hydroxamate siderophores that were trihydroxamate hexadentates. Wide-spread occurrence of siderophores in marine isolates indicate their functional role in maintaining overall productivity of coastal waters. Among all test aspergilli, marine Aspergillus versicolor was found to be the largest siderophore producer (182.5 µg/mL desferrioxamine mesylate equivalent), least siderophore production was recorded in a marine strain of Aspergillus niger (3.5 µg/mL desferrioxamine mesylate equivalent).Key words: catecholates, carboxylates, hexadentates, hydroxamates, siderophores.

Dix aspergillus (cinq d'habitats marins et cinq d'habitats terrestres) ont été criblés pour la production de sidérophores. Tous les isolats analysés ont produit des sidérophores tel que démontré par une réaction positive dans un test au FeCl3, le test chrome azurol sulphonate et le test chrome azurol sulphonate sur gélose. De plus, le potentiel de production de sidérophores des isolats analysés de même que leur caractérisation chimique furent comparés. L'examen de la nature chimique des sidérophores a révélé que tous les isolats analysés produisaient des sidérophores d'hydroxamate qui étaient des hexadentates de trihydroxamate. La présence également répandue de sidérophores chez des isolats d'habitats marins souligne leur rôle fonctionnel dans le maintien de la productivité générale des eaux côtières. Parmi tous les aspergillus analysés, le A. versicolor marin a démontré la production de sidérophore la plus élevée (182,5 µg/mL d'équivalent mésylate de déféroxamine) alors qu'une production moindre de sidérophore fut mesurée chez la souche marine de A. niger (3,5 µg/mL d'équivalent mésylate de déféroxamine).Mots clés : catécholates, carboxylates, hexadentates, hydroxamates, sidérophores.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: June 1, 2006

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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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