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TitleThe structure of PSI-LHCI from provides evolutionary insights into conservation and diversity of red-lineage LHCs.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 121, Issue 11, Page e2319658121, Year 2024
Publish dateMar 12, 2024
AuthorsKoji Kato / Tasuku Hamaguchi / Minoru Kumazawa / Yoshiki Nakajima / Kentaro Ifuku / Shunsuke Hirooka / Yuu Hirose / Shin-Ya Miyagishima / Takehiro Suzuki / Keisuke Kawakami / Naoshi Dohmae / Koji Yonekura / Jian-Ren Shen / Ryo Nagao /
PubMed AbstractLight-harvesting complexes (LHCs) are diversified among photosynthetic organisms, and the structure of the photosystem I-LHC (PSI-LHCI) supercomplex has been shown to be variable depending on the ...Light-harvesting complexes (LHCs) are diversified among photosynthetic organisms, and the structure of the photosystem I-LHC (PSI-LHCI) supercomplex has been shown to be variable depending on the species of organisms. However, the structural and evolutionary correlations of red-lineage LHCs are unknown. Here, we determined a 1.92-Å resolution cryoelectron microscopic structure of a PSI-LHCI supercomplex isolated from the red alga RK-1 (NIES-2137), which is an important taxon in the Cyanidiophyceae. We subsequently investigated the correlations of PSI-LHCIs from different organisms through structural comparisons and phylogenetic analysis. The PSI-LHCI structure obtained shows five LHCI subunits surrounding a PSI-monomer core. The five LHCIs are composed of two Lhcr1s, two Lhcr2s, and one Lhcr3. Phylogenetic analysis of LHCs bound to PSI in the red-lineage algae showed clear orthology of LHCs between and , whereas no orthologous relationships were found between Lhcr1-3 and LHCs in other red-lineage PSI-LHCI structures. These findings provide evolutionary insights into conservation and diversity of red-lineage LHCs associated with PSI.
External linksProc Natl Acad Sci U S A / PubMed:38442179 / PubMed Central
MethodsEM (single particle)
Resolution1.92 Å
Structure data

37480

8wey

EMDB-37480, PDB-8wey:
PSI-LHCI of the red alga Cyanidium caldarium RK-1 (NIES-2137)
Method: EM (single particle) / Resolution: 1.92 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER / Chlorophyll a

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

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

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

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

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM


ChemComp, No image

ChemComp-UNL:
Unknown ligand

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)


ChemComp, No image

ChemComp-5X6:
Unknown entry

ChemComp-HOH:
WATER / Water

Source
  • cyanidium caldarium (eukaryote)
KeywordsPHOTOSYNTHESIS / Photosystem I / ELECTRON TRANSPORT

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