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  • Title: The electron transport chain of Rhizobium trifolii.
    Author: de Hollander JA, Stouthamer AH.
    Journal: Eur J Biochem; 1980 Oct; 111(2):473-8. PubMed ID: 7460910.
    Abstract:
    The presence of a branched respiratory chain in Rhizobium trifolii grown in batch culture on a defined medium was demonstrated. The branches of the respiratory chain differ in sensitivity to inhibition by cyanide and in affinity for oxygen. The branching point is localized at cytochrome b-555. Electron flow from cytochrome b-555 via cytochrome c-549 and cytochrome a-597 towards oxygen has a relatively low affinity for oxygen and is sensitive to inhibition by cyanide. The second terminal oxidase is cytochrome b-561, which is directly linked to cytochrome b-555. This pathway has a higher affinity for oxygen. The pathway via cytochrome a-597 is more efficient in energy conservation than the pathway via cytochrome b-561, which lacks site III of oxidative phosphorylation.
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