Chromatographic separation of photosystems I and II from the thylakoid membrane isolated from a thermophilic blue-green alga
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概要
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The thylakoid membrane of a thermophilic blue-green alga, Synechococcus sp., was separated into four chlorophyll-containing fractions by a single chromatographic manipulation with a diethylaminoethyl-cellulose column after digitonin treatment. Photosystems I and II, or chlorophyll a forms, were unevenly distributed among the four fractions, which were designated F-1, F-2, F-3 and F-4 in the order of elution from the column. F-1 has a simple composition of the chlorophyll a form and totally lacks photochemical activity. This fraction may be an antenna chlorophyll a-protein in the blue-green alga. F-2 is rich in shorter wavelength chlorophyll a forms and shows the three-banded fluorescence emission spectrum characteristic of photosystem 11 at liquid nitrogen temperature. This fraction is highly active in 2,6-dichloroindophenol photoreduction and contains one photooxidizable cytochrome b_<559> per 50-100 chlorophyll a, whereas the P-700 content is as low as one P-700 per 2,000 chlorophyll a. Thus, F-2 represents photo-system II in a highly purified state. F-3 is rich in photosystem I, since this fraction is inactive in 2,6-dichloroindophenol photoreduction, and contains one P-700 per 200 chlorophyll a and smaller amounts of cytochrome b_<559>. Longer wavelength chlorophyll a forms are abundant and a peak at 730 nm is the most prominent in the low-temperature fluorescence spectrum in this fraction. F-4, which consists of larger membrane fragments shows spectral and photochemical features similar to those of F-3.
- 日本植物生理学会の論文
著者
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Yamaoka Takashi
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Yamaoka Takashi
Department Of Chemistry Faculty Of Science Kyoto University
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Katoh Sakae
Department Of Biology Faculty Of Science Toho University
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Nakayama Katsumi
Department Of Biology Faculty Of Science Toho University
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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