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Journal Article

Cryo-EM structure of the whole photosynthetic reaction center apparatus from the green sulfur bacterium Chlorobaculum tepidum

MPS-Authors
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Xie,  Hao       
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Khera,  Radhika       
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Welsch,  Sonja       
Central Electron Microscopy Facility, Max Planck Institute of Biophysics, Max Planck Society;

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Michel,  Hartmut       
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Xie, H., Lyratzakis, A., Khera, R., Koutantou, M., Welsch, S., Michel, H., et al. (2023). Cryo-EM structure of the whole photosynthetic reaction center apparatus from the green sulfur bacterium Chlorobaculum tepidum. Proceedings of the National Academy of Sciences of the United States of America, 120(5): e2216734120. doi:10.1073/pnas.2216734120.


Cite as: https://hdl.handle.net/21.11116/0000-000C-772C-E
Abstract
Light energy absorption and transfer are very important processes in photosynthesis. In green sulfur bacteria light is absorbed primarily by the chlorosomes and its energy is transferred via the Fenna–Matthews–Olson (FMO) proteins to a homodimeric reaction center (RC). Here, we report the cryogenic electron microscopic structure of the intact FMO-RC apparatus from Chlorobaculum tepidum at 2.5 Å resolution. The FMO-RC apparatus presents an asymmetric architecture and contains two FMO trimers that show different interaction patterns with the RC core. Furthermore, the two permanently bound transmembrane subunits PscC, which donate electrons to the special pair, interact only with the two large PscA subunits. This structure fills an important gap in our understanding of the transfer of energy from antenna to the electron transport chain of this RC and the transfer of electrons from reduced sulfur compounds to the special pair.