文章基本信息

标题：The Isolation and Characterization of a Photochemically Active Complex from Chloropseudomonas ethylica
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作者：C. F. Fowler ; N. A. Nugent ; R. C. Fuller 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1971
卷号：68
期号：9
页码：2278-2282
DOI：10.1073/pnas.68.9.2278
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：A photochemically active subcellular fraction has been isolated from the green bacterium Chloropseudomonas ethylica. It is enriched in bacteriochlorophyll a and contains only a small amount of Chlorobium chlorophyll. Both a reaction-center bleaching (P840) and a cytochrome oxidation (C553) are observed to occur in the fraction. Particles that are contained in the fraction are larger than 1.5 x 106 daltons and exhibit a range of sizes consistent with some form of polymeric association of similar subunits. Around 80 bacteriochlorophyll a molecules are present per P840. In an intact photosynthetic apparatus there are about 1000-1500 total chlorophylls (including Chlorobium chlorophyll) per reaction center. The redox potentials of the reaction center P840 and C553 were found to be 0.24 and 0.17 V, respectively, in one-electron reactions. The potentials of these components are around 0.2 V lower than comparable components found in other photosynthetic organisms.
关键词：bacteriochlorophyll a ; carotenoid pigments ; redox potential