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TitleDistinct structural modulation of photosystem I and lipid environment stabilizes its tetrameric assembly.
Journal, issue, pagesNat Plants, Vol. 6, Issue 3, Page 314-320, Year 2020
Publish dateMar 9, 2020
AuthorsMing Chen / Annemarie Perez-Boerema / Laixing Zhang / Yanxue Li / Maojun Yang / Shizhong Li / Alexey Amunts /
PubMed AbstractPhotosystem 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 ...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.
External linksNat Plants / PubMed:32170279
MethodsEM (single particle)
Resolution3.2 Å
Structure data

10461

6tcl

EMDB-10461, PDB-6tcl:
Photosystem I tetramer
Method: EM (single particle) / Resolution: 3.2 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-PQN:
PHYLLOQUINONE

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

ChemComp-BCR:
BETA-CAROTENE

ChemComp-AJP:
Digitonin / detergent*YM

ChemComp-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

ChemComp-ECH:
beta,beta-caroten-4-one

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

Source
  • nostoc sp. pcc 7120 (bacteria)
KeywordsPHOTOSYNTHESIS / tetramer / anabaena / PSI

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