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Specificity of siderophore-mediated transport of iron in rhizobia

Carson, K.C., Glenn, A.R. and Dilworth, M.J. (1994) Specificity of siderophore-mediated transport of iron in rhizobia. Archives of Microbiology, 161 (4). pp. 333-339.

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The trihydroxamate siderophore, hydroxamate K, has been purified from culture filtrates of iron-deficient Rhizobium leguminosarum biovar viciae MNF710. The iron complex has a molecular weight of 828 and an absorption maximum at 443 nm (εM=1510). 55Fe complexed to purified hydroxamate K was taken up by MNF710, its hydroxamate-negative mutant MNF7102 and Rhizobium leguminosarum biovar trifolii WU95 via an iron-regulated transport system, but Rhizobium meliloti U45 failed to take up the iron-siderophore complex under any conditions. A similar pattern of iron uptake was observed with ferrioxamine B. MNF710, MNF7102, U45 and WU95 all transported 55Fe-ferrichrome but only the first three strains took up 55Fe-ferrichrome A. All these 55Fe-trihydroxamate uptake systems were ironregulated in MNF710, MNF7102 and WU95. In contrast, uptake of 55Fe-rhodotorulate, a dihydroxamate, was essentially constitutive in all four organisms. Similarly, uptake of 55Fe-citrate and 55Fe-nitrilotriacetic acid was constitutive. None of the strains took up 55Fe complexed with enterobactin or with pyoverdins from Pseudomonas aeruginosa ATCC15692 (PAO1) and Pseudomonas fluorescens ATCC17400.

Item Type: Journal Article
Murdoch Affiliation: School of Biological and Environmental Sciences
Publisher: Springer Verlag
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