Hybrid Respiration in the Denitrifying Mitochondria of Fusarium oxysporum

2003 
Induction of the mitochondrial nitrate-respiration (denitrification) system of the fungus Fusarium oxysporum requires the supply of low levels of oxygen (O 2 ). Here we show that O 2 and nitrate (NO 3 -) respiration function simultaneously in the mitochondria of fungal cells incubated under hypoxic, denitrifying conditions in which both O 2 and NO 3 - act as the terminal electron acceptors. The NO 3 - and nitrite (NO 2 -) reduct-ases involved in fungal denitrification share the mitochondrial respiratory chain with cytochrome oxidase. F. oxysporum cytochrome c 5 4 9 can serve as an electron donor for both NO 2 - reductase and cytochrome oxidase. We are the first to demonstrate hybrid respiration in respiring eukaryotic mitochondria.
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