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-Structure paper
Title | The structure of PSI-LHCI from provides evolutionary insights into conservation and diversity of red-lineage LHCs. |
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Journal, issue, pages | Proc Natl Acad Sci U S A, Vol. 121, Issue 11, Page e2319658121, Year 2024 |
Publish date | Mar 12, 2024 |
Authors | Koji 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 Abstract | 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 ...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 links | Proc Natl Acad Sci U S A / PubMed:38442179 / PubMed Central |
Methods | EM (single particle) |
Resolution | 1.92 Å |
Structure data | EMDB-37480, PDB-8wey: |
Chemicals | ChemComp-CL0: ChemComp-CLA: ChemComp-PQN: ChemComp-LHG: ChemComp-BCR: ChemComp-SF4: ChemComp-LMT:
ChemComp-UNL: ChemComp-DGD:
ChemComp-5X6: ChemComp-HOH: |
Source |
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Keywords | PHOTOSYNTHESIS / Photosystem I / ELECTRON TRANSPORT |