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Appl Environ Microbiol. 1989 May; 55(5): 1117-1121
Copyright © 1989, American Society for Microbiology. All Rights Reserved.

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

Isamu Suzuki*, Hector M. Lizama and Patrick D. Tackaberry

Department of Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

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.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1989 May; 55(5): 1117-1121
Copyright © 1989, American Society for Microbiology. All Rights Reserved.



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Copyright © 1989 by the American Society for Microbiology. All rights reserved.