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- W1980344142 abstract "Chloroplast material active in photosynthetic electron transport has been isolated from Scenedesmus acutus (strain 270/3a). During homogenization, part of cytochrome 553 was solubilized, and part of it remained firmly bound to the membrane. A direct correlation between membrane cytochrome 553 and electron transport rates could not be found. Sonification removes plastocyanin, but leaves bound cytochrome 553 in the membrane. Photooxidation of the latter is dependent on added plastocyanin. In contrast to higher plant chloroplasts, added soluble cytochrome 553 was photooxidized by 707 nm light without plastocyanin present. Reduced plastocyanin or cytochrome 553 stimulated electron transport by Photosystem I when supplied together or separately. These reactions and cytochrome 553 photooxidation were not sensitive to preincubation of chloroplasts with KCN, indicating that both redox proteins can donate their electrons directly to the Photosystem I reaction center. Scenedesmus cytochrome 553 was about as active as plastocyanin from the same alga, whereas the corresponding protein from the alga Bumilleriopsis was without effect on electron transport rates. It is suggested that besides the reaction sequence cytochrome 553 → plastocyanin → Photosystem I reaction center, a second pathway cytochrome 553 → Photosystem I reaction center may operate additionally." @default.
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- W1980344142 date "1976-12-01" @default.
- W1980344142 modified "2023-09-26" @default.
- W1980344142 title "Reactions of plastocyanin and cytochrome 553 with Photosystem I of Scenedesmus" @default.
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- W1980344142 doi "https://doi.org/10.1016/0005-2728(76)90163-8" @default.
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