Chromatic Regulation of Cytochrome Composition and Electron Transfer from Cytochrome b6-f Complex to Photosystem I in Anacystis nidulans (Tx 20) |
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Authors: | Matsuura Katsumi; Fujita Yoshihiko |
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Institution: | Department of Cell Biology, National Institute for Basic Biology Okazaki, Aichi 444, Japan |
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Abstract: | Cytochrome composition of the cyanobacterial photosyntheticsystem was studied with Anacystis nidulans (Tx 20) in relationto the chromatic regulation of photosystem composition. Comparisonof cytochrome compositions in cells with a high PS I/II ratio(3.0, grown under weak orange light) and with a low ratio (1.6,grown under weak red light) indicated that cytochrome compositionwas also changed in the chromatic regulation of photosystemcomposition. Two types of cytochrome change were observed: 1)contents of cytochromes C553 and c548 were changed in parallelwith the changes in PS I content, and 2) cytochrome b553 andcytochrome b6-f complex were held at a constant molar ratioto PS II. The molar ratio, PS II : cytochrome b559 : cytochromeb6-f complex : cytochrome c553 : PS I : cytochrome C548, inthe red-grown cells was 1 : 2.5 : 1.3 : 0.17 : 1.6 : 0.67, andthe ratio in the orange-grown cells, 1:2.4:0.9:0.32:3.0:1.2.In both types of cells, almost all cytochrome f in the cytochromeb6-f complex was rapidly oxidized after multiple flash activation,indicating that all cytochrome b6-f complexes in cells of bothtypes are functionally connected to PS I, even when the molarratio to PS I is largely changed. The content of cytochromeC553 was at most 0.14 of PS I, suggesting that the cytochrometurns over several times per one turnover of PS I.
1Present address: Department of Biology, Faculty of Science,Tokyo Metropolitan University, Fukazawa 2-1-1, Setagaya, Tokyo158, Japan. (Received January 20, 1986; Accepted March 17, 1986) |
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