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

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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.