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. 1994 Jun;60(6):2132–2136. doi: 10.1128/aem.60.6.2132-2136.1994

Siderophore-Mediated Iron Sequestering by Shewanella putrefaciens

Lone Gram 1,*
PMCID: PMC201611  PMID: 16349298

Abstract

The iron-sequestering abilities of 51 strains of Shewanella putrefaciens isolated from different sources (fish, water, and warm-blooded animals) were assessed. Thirty strains (60%) produced siderophores in heat-sterilized fish juice as determined by the chrome-azurol-S assay. All cultures were negative for the catechol-type siderophore, whereas 24 of the 30 siderophore-producing strains tested positive in the Csáky test, indicating the production of siderophores of the hydroxamate type. Siderophore-producing S. putrefaciens could to some degree cross-feed on the siderophores of other S. putrefaciens strains and on compounds produced by an Aeromonas salmonicida strain under iron-limited conditions. The siderophores of S. putrefaciens were not sufficiently strong to inhibit growth of other bacteria under iron-restricted conditions. However, siderophore-producing Pseudomonas bacteria were always inhibitory to S. putrefaciens under iron-limited conditions. Growth of siderophore-producing strains under iron-limited conditions induced the formation of one major new outer membrane protein of approximately 72 kDa. Two outer membrane proteins of approximately 53 and 23 kDa were not seen when iron was restricted.

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Selected References

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