Molecular mechanism of the functional regulation of the bacterial photosynthetic light-harvesting-reaction center complexes

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The bacterial photosynthesis that provides a simplified model system ideally for studying the light energy conversion has been investigated using various physicochemical methods. We have determined the pigment geometry and structures of the polypeptides in an antenna structural subunit. A core light-harvesting-reaction center complex has been crystallized. The unusual spectroscopic behavior and enhanced thermostability of the core complex from a thennophilic bacterium has been clarified, revealing the adaptive strategy of the photosynthetic organism to survive in extreme environments using natural resources.