Electron donor-specificity observed in photosystem I reactions of membrane fragments of the blue-green alga Anabaena variabilis and the higher plant Spinacea oleracea |
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Authors: | Tsuji Takashi; Fujita Yoshihiko |
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Institution: | Ocean Research Institute, University of Tokyo Nakano, Tokyo, Japan |
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Abstract: | Electron donating activities of plastocyanins and c-type cytochromesof various organisms for photosystem I reactions were studiedwith membrane fragments of the blue-green alga Anabaena variabilisand the higher plant Spinacea oleracea. In the Anabaena photosystem I reaction, basic but not acidicplastocyanin and c-type cytochromes acted as efficient electrondonors, while only acidic redox proteins were active in thespinach photosystem I reaction. The selective reactivity ofredox proteins in the two photosystem I reactions was observedwith both plastocyanin (or cytochrome) limited and saturatedconditions. These data support our previous observation that photosystemI of blue-green algae differs from those of other green plantswith respect to specificity to the proteinous electron donor(1). (Received August 17, 1971; ) |
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