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An overview on chlorophylls and quinones in the photosystem I-type reaction centers |
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| Authors: | Shunsuke Ohashi Tatsuya Iemura Naoki Okada Shingo Itoh Hayato Furukawa Masaaki Okuda Mayumi Ohnishi-Kameyama Takuro Ogawa Hideaki Miyashita Tadashi Watanabe Shigeru Itoh Hirozo Oh-oka Kazuhito Inoue Masami Kobayashi |
| Affiliation: | 1. Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan 2. National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki, 305-8642, Japan 3. Department of Biological Sciences, Kanagawa University, 2946 Tsuchiya, Hiratsuka, Kanagawa, 259-1293, Japan 4. Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan 5. Institute of Industrial Science, University of Tokyo, Komaba, Tokyo, 153-8505, Japan 6. Division of Material Science, Graduate School of Science, Nagoya University, Nagoya, 456-8602, Japan 7. Department of Biological Sciences, Graduate School of Science, Osaka University, Osaka, 560-0043, Japan |
| Abstract: | Minor but key chlorophylls (Chls) and quinones in photosystem (PS) I-type reaction centers (RCs) are overviewed in regard to their molecular structures. In the PS I-type RCs, the prime-type chlorophylls, namely, bacteriochlorophyll (BChl) a′ in green sulfur bacteria, BChl g′ in heliobacteria, Chl a′ in Chl a-type PS I, and Chl d′ in Chl d-type PS I, function as the special pairs, either as homodimers, (BChl a′)2 and (BChl g′)2 in anoxygenic organisms, or heterodimers, Chl a/a′ and Chl d/d′ in oxygenic photosynthesis. Conversions of BChl g to Chl a and Chl a to Chl d take place spontaneously under mild condition in vitro. The primary electron acceptors, A 0, are Chl a-derivatives even in anoxygenic PS I-type RCs. The secondary electron acceptors are naphthoquinones, whereas the side chains may have been modified after the birth of cyanobacteria, leading to succession from menaquinone to phylloquinone in oxygenic PS I. |
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