Download MendeleyStructure of a green algal photosystem I in complex with a large number of light-harvesting complex I subunits.
Qin, X., Pi, X., Wang, W., Han, G., Zhu, L., Liu, M., Cheng, L., Shen, J.R., Kuang, T., Sui, S.F.(2019) Nat Plants 5: 263-272
- PubMed: 30850820
- DOI: https://doi.org/10.1038/s41477-019-0379-y
- Primary Citation of Related Structures:
6IGZ - PubMed Abstract:
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.
Organizational Affiliation:
School of Biological Science and Technology, University of Jinan, Jinan, China.
