Tellurite reductase activity of nitrate reductase is responsible for the basal resistance of Escherichia coli to tellurite

Article Abstract:

Nitrate reductases from Escherichia coli were identified to have tellurite and selenate reduction activities via the viologen activity-staining technique. These were also found responsible for the natural resistance of E. coli to tellurite. A soluble enzyme in anaerobically grown cells which reduced tellurite was also identified. Under anaerobic conditions, nitrate reductase mutants were not hypersensitive probably due to the presence of additional reductase activity.

Physiological aspects, Escherichia coli, Bacteria, Selenite

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Characterization of the reduction of selenate and telluride by nitrate reductases

Article Abstract:

Bacterial nitrate reductases are capable of reducing selenate and tellurite, which may explain why some gram-negative organisms are resistant to tellurite. This was confirmed in Rhodobacter sphaeroides, Escherichia coli, Ralstonia eutropha, Paracoccus denitrificans, and Paracoccus pantotrophus.

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Reduction of technetium (VII) by Desulfovibrio fructosovorans is mediated by the nickel-iron hydrogenase

Article Abstract:

Desulfovibrio fructosovorans uses a nickel-iron hydrogenase to reduce the pertechnetate anion Tc(VII). This is the most common form of technetium, which is formed during the generation of nuclear power and can contaminate the environment.

Technetium

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