Analysis of light-harvesting supramolecular complexes of green photosynthetic bacteria by regulation of structural changes

通过改变光合细菌主要捕光复合体的组成和超分子结构，研究了绿色光合细菌主要捕光复合体--绿色体的光谱性质和功能。通过改变培养条件，成功地实现了绿色硫光合细菌细胞内捕光细菌叶绿素异构体组成的变化。分析了从这些细菌中分离得到的绿色体的光谱性质。色素超分子模拟叶绿体的光谱变化，由外部刺激进行了研究。此外，结构依赖的脱金属性质的捕光细菌叶绿素的叶绿体在弱酸性条件下被解开。

Spectral properties and functions of major light-harvesting complexes, chlorosomes, of green photosynthetic bacteria were characterized by induction of changes of their components and supramolecular structures. Isomer composition changes of light-harvesting bacteriochlorophylls in cells of green sulfur photosynthetic bacteria were successfully performed by changes of cultivating conditions. Spectroscopic properties of chlorosomes that were isolated from these bacteria were analyzed. Spectral changes of pigment supramolecules mimicking chlorosomes by external stimuli were also examined. In addition, structure-dependent demetalation properties of light-harvesting bacteriochlorophylls of chlorosomes were unraveled under weakly acidic conditions.