6IGZ
Structure of PSI-LHCI
Summary for 6IGZ
| Entry DOI | 10.2210/pdb6igz/pdb |
| EMDB information | 9670 |
| Descriptor | PsaA, PsaJ, PsaK, ... (31 entities in total) |
| Functional Keywords | psi-lhci, plant protein |
| Biological source | Bryopsis corticulans More |
| Total number of polymer chains | 23 |
| Total formula weight | 841703.80 |
| Authors | Xiong, P.,Xiaochun, Q. (deposition date: 2018-09-27, release date: 2019-02-13, Last modification date: 2025-06-25) |
| Primary citation | Qin, X.,Pi, X.,Wang, W.,Han, G.,Zhu, L.,Liu, M.,Cheng, L.,Shen, J.R.,Kuang, T.,Sui, S.F. Structure of a green algal photosystem I in complex with a large number of light-harvesting complex I subunits. Nat Plants, 5:263-272, 2019 Cited by 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. PubMed: 30850820DOI: 10.1038/s41477-019-0379-y PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.49 Å) |
Structure validation
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