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TitleStructure of a photosystem I supercomplex from close to an ancestral red alga.
Journal, issue, pagesSci Adv, Vol. 11, Issue 20, Page eadv7488, Year 2025
Publish dateMay 16, 2025
AuthorsKoji Kato / Minoru Kumazawa / Yoshiki Nakajima / Takehiro Suzuki / Naoshi Dohmae / Jian-Ren Shen / Kentaro Ifuku / Ryo Nagao /
PubMed AbstractRed algae exhibit unique photosynthetic adaptations, characterized by photosystem I (PSI) supercomplexes containing light-harvesting complexes (LHCs), forming PSI-LHCI supercomplexes. In this study, ...Red algae exhibit unique photosynthetic adaptations, characterized by photosystem I (PSI) supercomplexes containing light-harvesting complexes (LHCs), forming PSI-LHCI supercomplexes. In this study, we solved the PSI-LHCI structure of NIES-3638 at 2.19-angstrom resolution using cryo-electron microscopy, revealing a PSI monomer core associated with seven LHCI subunits. Structural analysis uncovered the absence of phylloquinones, the common secondary electron acceptor in PSI of photosynthetic organisms, suggesting adaptation to a benzoquinone-like molecule. Phylogenetic analysis suggests that retains traits characteristic of an ancestral red alga, including distinctive LHCI binding and interaction patterns. Variations in LHCI composition and interactions across red algae, particularly in red-lineage chlorophyll /-binding-like protein and red algal LHCs, highlight evolutionary divergence and specialization. These findings not only deepen our understanding of red algal PSI-LHCI diversification but also enable us to predict features of an ancestral red algal PSI-LHCI supercomplex, providing a framework to explore evolutionary adaptations from an ancestral red alga.
External linksSci Adv / PubMed:40378202 / PubMed Central
MethodsEM (single particle)
Resolution2.19 Å
Structure data

62242

9kc5

EMDB-62242, PDB-9kc5:
PSI-LHCI of the red alga Galdieria sulphuraria NIES-3638
Method: EM (single particle) / Resolution: 2.19 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-CLA:
CHLOROPHYLL A

PDB-1l64:
TOLERANCE OF T4 LYSOZYME TO MULTIPLE XAA (RIGHT ARROW) ALA SUBSTITUTIONS: A POLYALANINE ALPHA-HELIX CONTAINING TEN CONSECUTIVE ALANINES

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

ChemComp-BCR:
BETA-CAROTENE

ChemComp-SF4:
IRON/SULFUR CLUSTER


ChemComp, No image

ChemComp-UNL:
Unknown ligand

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)


ChemComp, No image

ChemComp-5X6:
Unknown entry

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

ChemComp-RRX:
(3R)-beta,beta-caroten-3-ol

ChemComp-HOH:
WATER

Source
  • galdieria sulphuraria (eukaryote)
KeywordsPHOTOSYNTHESIS / Photosystem I / ELECTRON TRANSPORT

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