A probable lack of function of c-type cytochrome in the photosynthetic system of the blue-green alga Anabaena variabilis
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概要
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Quantitative study of the cytochrome c acting in the photosynthetic system of the blue-green alga Anabaena variabilis (M-2) was done with membrane fragments and intact cells. Membrane fragments highly active in the NADP^+-Hill reaction (above 200 μmoles/mg chl. a・hr) retained photoresponsive cytochrome c equal only one-tenth that of P700, while the plastocyanin content was almost equal to that of P700. The cytochrome content in intact cells was a little larger than that in membrane fragments on the chlorophyll a basis. However, the values relative to P700 (1/9) and plastocyanin (1/10) were identical with those in membrane fragments. The content was also far smaller than that of reaction center II's (1/6). If the cytochrome mediates all electrons from reaction center II, the cytochrome oxidation-reduction should have a rate constant of 2.4×10^2 sec^<-1> which is one order above of the rate constant of the cytochrome reduction (2.3 to 3.5×10^1 sec^<-1>). These quantitative relationships indicate that in Anabaena variabilis (M-2), c-type cytochrome, either cytochrome f or algal cytochrome c, cannot function in the main electron flow between two reaction centers.
- 日本植物生理学会の論文
著者
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Kawamura Michio
Ocean Research Institute, University of Tokyo
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Kawamura Michio
Ocean Research Institute University Of Tokyo
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Fujita Yoshihiko
Ocean Research Institute University Of Tokyo
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