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18 January 2021 Structural biologists peer deeper into the world of bacterial photosynthesis Researchers have used cryo-electron microscopy to determine the structures of two key photosynthetic complexes from a purple bacterium, providing new insights into how the absorption of light is wired to the storage of energy in chemical forms. University of Sheffield researchers have used cryo-electron microscopy to determine the structures of two key photosynthetic complexes from a purple bacterium, providing new insights into how the absorption of light is wired to the storage of energy in chemical forms. Purple phototropic bacteria contain reaction centres, which use light to power a series of electron transfers that convert light energy into chemical energy. Each reaction centre (RC) is surrounded by a light-harvesting antenna called LH1, which greatly increases the amount of light that can be used for this process. Despite being formed from a set of common bui ....