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Plant and Cell Physiology, 1986, Vol. 27, No. 4 685-691
© 1986

Article

Chromatic Regulation of Cytochrome Composition and Electron Transfer from Cytochrome b6-f Complex to Photosystem I in Anacystis nidulans (Tx 20)

Katsumi Matsuura1 and Yoshihiko Fujita

Department of Cell Biology, National Institute for Basic Biology Okazaki, Aichi 444, Japan

Cytochrome composition of the cyanobacterial photosynthetic system was studied with Anacystis nidulans (Tx 20) in relation to the chromatic regulation of photosystem composition. Comparison of 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 composition was also changed in the chromatic regulation of photosystem composition. Two types of cytochrome change were observed: 1) contents of cytochromes C553 and c548 were changed in parallel with the changes in PS I content, and 2) cytochrome b553 and cytochrome b6-f complex were held at a constant molar ratio to PS II. The molar ratio, PS II : cytochrome b559 : cytochrome b6-f complex : cytochrome c553 : PS I : cytochrome C548, in the red-grown cells was 1 : 2.5 : 1.3 : 0.17 : 1.6 : 0.67, and the 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 cytochrome b6-f complex was rapidly oxidized after multiple flash activation, indicating that all cytochrome b6-f complexes in cells of both types are functionally connected to PS I, even when the molar ratio to PS I is largely changed. The content of cytochrome C553 was at most 0.14 of PS I, suggesting that the cytochrome turns 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, Tokyo 158, Japan.

(Received January 20, 1986; Accepted March 17, 1986)
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