The 17-propionate function of (bacterio)chlorophylls: biological implication of their long esterifying chains in photosynthetic systems |
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Authors: | Tamiaki Hitoshi Shibata Reiko Mizoguchi Tadashi |
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Institution: | Department of Bioscience and Biotechnology, Ritsumeikan University, Kusatsu, Japan. tamiaki@se.ritsumei.ac.jp |
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Abstract: | Molecular structures of (bacterio)chlorophylls = (B)Chls] in photosynthetic apparatus are surveyed, and a diversity of the ester groups of the 17-propionate substituent is particularly focused on in this review. In oxygenic photosynthetic species including green plants and algae, the ester of Chl molecules is limited to a phytyl group. Geranylgeranyl and farnesyl groups in addition to phytyl are observed in (B)Chl molecules inside photosynthetic proteins of anoxygenic bacteria. In main light-harvesting antennas of green bacteria (chlorosomes), a greater variety of ester groups including long straight chains are used in the composite BChl molecules. This diversity is ascribable to the fact that chlorosomal BChls self-aggregate to form a core part of chlorosomes without any specific interaction of oligopeptides. Biological significance of the long chains is discussed in photosynthetic apparatus, especially in chlorosomes. |
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