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Structure of a green algal photosystem I in complex with a large number of light-harvesting complex I subunits
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Structure of a green algal photosystem I in complex with a large number of light-harvesting complex I subunits
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Journal Article
Structure of a green algal photosystem I in complex with a large number of light-harvesting complex I subunits
2019
Overview
Photosystem I (PSI) is a highly efficient natural light-energy converter, and has diverse light-harvesting antennas associated with its core in different photosynthetic organisms. In green algae, an extremely large light-harvesting complex I (LHCI) captures and transfers energy to the PSI core. Here, we report the structure of PSI–LHCI from a green alga
Bryopsis corticulans
at 3.49 Å resolution, obtained by single-particle cryo-electron microscopy, which revealed 13 core subunits including subunits characteristic of both prokaryotes and eukaryotes, and 10 light-harvesting complex a (Lhca) antennas that form a double semi-ring and an additional Lhca dimer, including a novel four-transmembrane-helix Lhca. In total, 244 chlorophylls were identified, some of which were located at key positions for the fast energy transfer. These results provide a firm structural basis for unravelling the mechanisms of light-energy harvesting, transfer and quenching in the green algal PSI–LHCI, and important clues as to how PSI–LHCI has changed during evolution.
Structure of the photosystem I–light-harvesting complex I in green alga at 3.49 Å resolution shows 13 core subunits and 10 antennas in a double semi-ring. This provides a basis for unravelling the mechanisms of algal light-energy harvesting.
