Iron Transport in Escherichia coli : Relationship Between Chromium Sensitivity and High Iron Requirement in Mutants of Escherichia coli
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چکیده
منابع مشابه
Iron transport in Escherichia coli: uptake and modification of ferrichrome.
During the transport of iron as ferrichrome complex into cells of Escherichia coli K-12, the ligand was modified and excreted into the medium. The rate of the formation of the modified product corresponded with the rate of iron transport. The modified product showed a decreased affinity for ferric iron and did not serve as an effective iron ionophore. After all of the ferrichrome had been conve...
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Ferric iron is transported into Escherichia coli by a number of chelating compounds. Iron transport through the outer membrane by citrate, ferrichrome, enterobactin, aerobactin, yersiniabactin, and heme is catalyzed by highly specific proteins and across the cytoplasmic membrane by ABC transport systems with lower specificity. Transport across the outer membrane requires energy, which is provid...
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Although a functional tonB gene product was required for ferrichrome-mediated iron transport in whole cells of Escherichia coli K-12, such transport did not require the tonB+ function in spheroplasts. We suggest that in spheroplasts ferrichrome has direct access to the cytoplasmic membrane and that this is reflected in tonB-independent accumulation of ferrichrome iron. Therefore, the tonB gene ...
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The role of iron ions in paraquat toxicity was studied in bacterial system. We show that addition of ferrous iron led to an enhancement of the bacterial killing, whereas addition of chelating agents, such as nitrilotriacetate and desferrioxamine, markedly reduced, up to a total abolishment, the toxic effects. The calculated rates of bacterial killing are proportional to both paraquat and iron c...
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Introduction: Some strains of Escherichia Coli, including intestinal pathogenic strains, commensal strains, and extra intestinal pathogenic E. coli (ExPEC) have a significant impact on human health status. A standard vaccine designed based on conserved epitopes can stimulate a protective immune response against these pathogens. Additionally, enhanced expression at the infection site as a pathog...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1969
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.98.3.1135-1141.1969