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Inhibitor Studies Of Dissimilative Fe(III) Reduction By Pseudomonas Sp. Strain 200 ("Pseudomonas Ferrireductans")
R. Arnold, T. DiChristina, M. Hoffmann
Published 1986 · Chemistry, Medicine
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Aerobic respiration and dissimilative iron reduction were studied in pure, batch cultures of Pseudomonas sp. strain 200 ("Pseudomonas ferrireductans"). Specific respiratory inhibitors were used to identify elements of electron transport chains involved in the reduction of molecular oxygen and Fe(III). When cells were grown at a high oxygen concentration, dissimilative iron reduction occurred via an abbreviated electron transport chain. The induction of alternative respiratory pathways resulted from growth at low oxygen tension (less than 0.01 atm [1 atm = 101.29 kPa]). Induced cells were capable of O2 utilization at moderately increased rates; dissimilative iron reduction was accelerated by a factor of 6 to 8. In cells grown at low oxygen tension, dissimilative iron reduction appeared to be uncoupled from oxidative phosphorylation. Models of induced and uninduced electron transport chains, including a mathematical treatment of chemical inhibition within the uninduced, aerobic electron transport system, are presented. In uninduced cells respiring anaerobically, electron transport was limited by ferrireductase activity. This limitation may disappear among induced cells.
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