Abstract
A particulate fraction of E. coli contained flavoprotein, nonheme iron, ubiquinone, and cytochromes b1 and o. About 20% of the nonheme iron was reducible by NADH, ascorbate – phenazine methosulfate, and dithionite to a form which reacted rapidly with o-phenanthroline. Reduction of this o-phenanthroline-reacting nonheme iron species by NADH was inhibited by 2-heptyl-4-hydroxyquinoline N-oxide which inhibited the respiratory chain between ubiquinone and cytochrome b1. Reduction of cytochrome b1 could occur without reduction of this nonheme iron species. These results are discussed relative to the position of nonheme iron in the respiratory chain of E. coli.
Publisher
Canadian Science Publishing
Cited by
24 articles.
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