6K61
Cryo-EM structure of the tetrameric photosystem I from a heterocyst-forming cyanobacterium Anabaena sp. PCC7120
Summary for 6K61
| Entry DOI | 10.2210/pdb6k61/pdb |
| EMDB information | 9918 |
| Descriptor | Photosystem I P700 chlorophyll a apoprotein A1, Photosystem I reaction center subunit VIII, Photosystem I reaction center subunit XI, ... (20 entities in total) |
| Functional Keywords | photosystem i, psi, pcc7120, photosynthesis |
| Biological source | Nostoc sp. PCC 7120 More |
| Total number of polymer chains | 24 |
| Total formula weight | 733164.02 |
| Authors | |
| Primary citation | Zheng, L.,Li, Y.,Li, X.,Zhong, Q.,Li, N.,Zhang, K.,Zhang, Y.,Chu, H.,Ma, C.,Li, G.,Zhao, J.,Gao, N. Structural and functional insights into the tetrameric photosystem I from heterocyst-forming cyanobacteria. Nat.Plants, 5:1087-1097, 2019 Cited by PubMed Abstract: Two large protein-cofactor complexes, photosystem I and photosystem II, are the central components of photosynthesis in the thylakoid membranes. Here, we report the 2.37-Å structure of a tetrameric photosystem I complex from a heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. Four photosystem I monomers, organized in a dimer of dimer, form two distinct interfaces that are largely mediated by specifically orientated polar lipids, such as sulfoquinovosyl diacylglycerol. The structure depicts a more closely connected network of chlorophylls across monomer interfaces than those seen in trimeric PSI from thermophilic cyanobacteria, possibly allowing a more efficient energy transfer between monomers. Our physiological data also revealed a functional link of photosystem I oligomerization to cyclic electron flow and thylakoid membrane organization. PubMed: 31595062DOI: 10.1038/s41477-019-0525-6 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (2.37 Å) |
Structure validation
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