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. 1989 May;55(5):1117–1121. doi: 10.1128/aem.55.5.1117-1121.1989

Competitive Inhibition of Ferrous Iron Oxidation by Thiobacillus ferrooxidans by Increasing Concentrations of Cells

Isamu Suzuki 1,*, Hector M Lizama 1, Patrick D Tackaberry 1
PMCID: PMC184263  PMID: 16347904

Abstract

The oxidation of ferrous iron (Fe2+) to ferric iron (Fe3+) with dioxygen (O2) by various strains of Thiobacillus ferrooxidans was studied by measuring the rate of O2 consumption at various Fe2+ concentrations and cell concentrations. The apparent Km values for Fe2+ remained constant at different cell concentrations of laboratory strains ATCC 13661 and ATCC 19859 but increased with increasing cell concentrations of mine isolates SM-4 and SM-5. The latter results are explained by the competitive inhibition of the Fe2+-binding site of a cell by other cells in the reaction mixture. Possible mechanisms involving cell surface properties are discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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