Electron Transport Coupled to Nitrate Reduction in a Photodenitrifier, Rhodopseudomonas sphaeroides forma sp. denitnficans
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概要
- 論文の詳細を見る
The electron transport system involved in nitrate reduction and its relationship to photosynthetic cyclic electron transport in a photodenitrifier, Rhodopseudomonas sphaeroides forma sp. denitrificans, were studied. Nitrate oxidized only b-type cytochrome in the presence of cyanide, which inhibits nitrite reductase. Heptylhydroxyquinoline-N-oxide (HOQNO) inhibited the oxidation of b-type cytochrome by nitrate, but not the oxidation of b- and c-type cytochrome by nitrite. The inhibition by HOQNO was overcome by phenazine methosulfate (PMS). Absorption changes of b-type cytochrome induced by illumination were in just the opposite directions for oxygen- and nitrate-oxidized cells ; the cytochrome was reduced in oxygen-oxidized cells and oxidized in nitrate-oxidized cells. Antimycin enhanced the reduction and inhibited the oxidation, but had no inhibitory effect on the oxidation of b-type cytochrome by nitrate. Dithionite-reduced minus ferricyanide-oxidized difference spectra of cells at 77°K showed two b-type cytochrome components with a bands at 556.5 and 562 nm. The proportion of the b-562 component decreased in cells grown under denitrifying conditions. It was concluded that a b-type cytochrome is involved in the nitrate reduction. The b-type cytochrome was presumed to be an alternative to the cytochrome b in the photosynthetic cyclic electron transport.
- 日本植物生理学会の論文
著者
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Satoh Toshio
Department Of Bio-organic Medicinal Chemistry Faculty Of Pharmaceutical Sciences Tokushima Bunri Uni
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Bannai Makoto
Department Of Biology Tokyo Metropolitan University:(present)japanese Red Cross Tokyo-to Komagome Bl
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