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Structure paper

TitleStructure of a tetrameric photosystem I from a glaucophyte alga Cyanophora paradoxa.
Journal, issue, pagesNat Commun, Vol. 13, Issue 1, Page 1679, Year 2022
Publish dateMar 30, 2022
AuthorsKoji Kato / Ryo Nagao / Yoshifumi Ueno / Makio Yokono / Takehiro Suzuki / Tian-Yi Jiang / Naoshi Dohmae / Fusamichi Akita / Seiji Akimoto / Naoyuki Miyazaki / Jian-Ren Shen /
PubMed AbstractPhotosystem I (PSI) is one of the two photosystems functioning in light-energy harvesting, transfer, and electron transfer in photosynthesis. However, the oligomerization state of PSI is variable ...Photosystem I (PSI) is one of the two photosystems functioning in light-energy harvesting, transfer, and electron transfer in photosynthesis. However, the oligomerization state of PSI is variable among photosynthetic organisms. We present a 3.8-Å resolution cryo-electron microscopic structure of tetrameric PSI isolated from the glaucophyte alga Cyanophora paradoxa, which reveals differences with PSI from other organisms in subunit composition and organization. The PSI tetramer is organized in a dimer of dimers with a C2 symmetry. Unlike cyanobacterial PSI tetramers, two of the four monomers are rotated around 90°, resulting in a completely different pattern of monomer-monomer interactions. Excitation-energy transfer among chlorophylls differs significantly between Cyanophora and cyanobacterial PSI tetramers. These structural and spectroscopic features reveal characteristic interactions and excitation-energy transfer in the Cyanophora PSI tetramer, suggesting that the Cyanophora PSI could represent a turning point in the evolution of PSI from prokaryotes to eukaryotes.
External linksNat Commun / PubMed:35354806 / PubMed Central
MethodsEM (single particle)
Resolution3.2 - 4.0 Å
Structure data

30820

7dr0

EMDB-30820, PDB-7dr0:
Structure of Wild-type PSI monomer1 from Cyanophora paradoxa
Method: EM (single particle) / Resolution: 3.3 Å

30821

7dr1

EMDB-30821, PDB-7dr1:
Structure of Wild-type PSI monomer2 from Cyanophora paradoxa
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-30822:
Structure of Wild-type PSI tetramer from Cyanophora paradoxa
Method: EM (single particle) / Resolution: 4.0 Å

30823

7dr2

EMDB-30823, PDB-7dr2:
Structure of GraFix PSI tetramer from Cyanophora paradoxa
Method: EM (single particle) / Resolution: 3.8 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-BCR:
BETA-CAROTENE

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

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

Source
  • cyanophora paradoxa (eukaryote)
KeywordsPHOTOSYNTHESIS / Photosystem I / ELECTRON TRANSPORT

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