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TitleCryo-EM structure of a tetrameric photosystem I from TS-821, a thermophilic, unicellular, non-heterocyst-forming cyanobacterium.
Journal, issue, pagesPlant Commun, Vol. 3, Issue 1, Page 100248, Year 2022
Publish dateJan 10, 2022
AuthorsDmitry A Semchonok / Jyotirmoy Mondal / Connor J Cooper / Katrina Schlum / Meng Li / Muhamed Amin / Carlos O S Sorzano / Erney Ramírez-Aportela / Panagiotis L Kastritis / Egbert J Boekema / Albert Guskov / Barry D Bruce /
PubMed AbstractPhotosystem I (PSI) is one of two photosystems involved in oxygenic photosynthesis. PSI of cyanobacteria exists in monomeric, trimeric, and tetrameric forms, in contrast to the strictly monomeric ...Photosystem I (PSI) is one of two photosystems involved in oxygenic photosynthesis. PSI of cyanobacteria exists in monomeric, trimeric, and tetrameric forms, in contrast to the strictly monomeric form of PSI in plants and algae. The tetrameric organization raises questions about its structural, physiological, and evolutionary significance. Here we report the ∼3.72 Å resolution cryo-electron microscopy structure of tetrameric PSI from the thermophilic, unicellular cyanobacterium sp. TS-821. The structure resolves 44 subunits and 448 cofactor molecules. We conclude that the tetramer is arranged via two different interfaces resulting from a dimer-of-dimers organization. The localization of chlorophyll molecules permits an excitation energy pathway within and between adjacent monomers. Bioinformatics analysis reveals conserved regions in the PsaL subunit that correlate with the oligomeric state. Tetrameric PSI may function as a key evolutionary step between the trimeric and monomeric forms of PSI organization in photosynthetic organisms.
External linksPlant Commun / PubMed:35059628 / PubMed Central
MethodsEM (single particle)
Resolution3.7 Å
Structure data

13898

7qco

EMDB-13898, PDB-7qco:
The structure of Photosystem I tetramer from Chroococcidiopsis TS-821, a thermophilic, unicellular, non-heterocyst-forming cyanobacterium
Method: EM (single particle) / Resolution: 3.7 Å

Chemicals

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM / Phosphatidylglycerol

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

ChemComp-SF4:
IRON/SULFUR CLUSTER / Iron–sulfur cluster

Source
  • chroococcidiopsis sp. ts-821 (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem I / cyanobacterium Chroococcidiopsis sp. TS-821

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