Tamiaki Hitoshi, Shibata Reiko, Mizoguchi Tadashi
Department of Bioscience and Biotechnology, Ritsumeikan University, Kusatsu, Japan.
Photochem Photobiol. 2007 Jan-Feb;83(1):152-62. doi: 10.1562/2006-02-27-IR-819.
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.
本文综述了光合装置中（细菌）叶绿素[=（B）Chls]的分子结构，并特别关注了17-丙酸酯取代基酯基的多样性。在包括绿色植物和藻类在内的产氧光合物种中，叶绿素分子的酯仅限于植醇基。在无氧光合细菌的光合蛋白内部的（B）Chl分子中，除了植醇基之外还观察到了香叶基香叶基和法呢基。在绿色细菌（叶绿体）的主要捕光天线中，包括长直链在内的更多种类的酯基被用于复合细菌叶绿素分子中。这种多样性归因于叶绿体细菌叶绿素自我聚集形成叶绿体核心部分而无需寡肽的任何特异性相互作用这一事实。本文讨论了长链在光合装置特别是叶绿体中的生物学意义。
