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6TCL

Photosystem I tetramer

This is a non-PDB format compatible entry.
Summary for 6TCL
Entry DOI10.2210/pdb6tcl/pdb
EMDB information10461
DescriptorPhotosystem I P700 chlorophyll a apoprotein A1, Photosystem I reaction center subunit XI, Photosystem I reaction center subunit XII, ... (28 entities in total)
Functional Keywordsphotosynthesis, tetramer, anabaena, psi
Biological sourceNostoc sp. PCC 7120
More
Total number of polymer chains48
Total formula weight1478636.48
Authors
Chen, M.,Perez-Boerema, A.,Li, S.,Amunts, A. (deposition date: 2019-11-06, release date: 2020-02-19, Last modification date: 2024-05-22)
Primary citationChen, M.,Perez-Boerema, A.,Zhang, L.,Li, Y.,Yang, M.,Li, S.,Amunts, A.
Distinct structural modulation of photosystem I and lipid environment stabilizes its tetrameric assembly.
Nat.Plants, 6:314-320, 2020
Cited by
PubMed Abstract: Photosystem I (PSI) is able to form different oligomeric states across various species. To reveal the structural basis for PSI dimerization and tetramerization, we structurally investigated PSI from the cyanobacterium Anabaena. This revealed a disrupted trimerization domain due to lack of the terminal residues of PsaL in the lumen, which resulted in PSI dimers with loose connections between monomers and weaker energy-coupled chlorophylls than in the trimer. At the dimer surface, specific phospholipids, cofactors and interactions in combination facilitated recruitment of another dimer to form a tetramer. Taken together, the relaxed luminal connections and lipid specificity at the dimer interface account for membrane curvature. PSI tetramer assembly appears to increase the surface area of the thylakoid membrane, which would contribute to PSI crowding.
PubMed: 32170279
DOI: 10.1038/s41477-020-0610-x
PDB entries with the same primary citation
Experimental method
ELECTRON MICROSCOPY (3.2 Å)
Structure validation

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