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Structure paper

TitleStructural and spectral adaptation of the seagrass Posidonia oceanica photosystem I to seabed light.
Journal, issue, pagesNat Commun, Vol. 17, Issue 1, Year 2026
Publish dateJul 16, 2026
AuthorsAntonello Amelii / Stefano Capaldi / Mattia Russo / Zeno Guardini / Gennaro Sanità / Emanuela Esposito / Irene Olivé / Margherita Maiuri / Luca Dall'Osto / Giulio Cerullo / Gabriele Procaccini / Roberto Bassi /
PubMed AbstractSeagrasses are marine angiosperms re-adapted to underwater life, forming productive ecosystems and long-term carbon sinks. Posidonia oceanica thrives up to 50 m depth, where light is scarce and ...Seagrasses are marine angiosperms re-adapted to underwater life, forming productive ecosystems and long-term carbon sinks. Posidonia oceanica thrives up to 50 m depth, where light is scarce and spectrally shifted; yet, the molecular basis of its photosynthetic adaptation remains unclear. Here, we report that P. oceanica genetically adapts for highly efficient photon use under dim light by enhancing photosystem antenna size and reducing exciton trapping time. We determine the structures of P. oceanica PSI supercomplexes by cryo-electron microscopy, revealing an expanded antenna system composed of PSI-LHCI, a trimeric phospho-LHCII, and an additional LHCI heterodimer. Low-energy chlorophyll forms associated with LHCI are lost. Ultrafast spectroscopy shows that this loss correlates with faster exciton trapping, which compensates for antenna expansion and enhances light-use efficiency under dim light. We identify key residues responsible for the loss of low-energy forms. Reversion to land-plant ortholog sequences restores red-shifted emission, providing strategies to enhance light-use efficiency in crops.
External linksNat Commun / PubMed:42463682 / PubMed Central
MethodsEM (single particle)
Resolution2.79 - 3.78 Å
Structure data

EMDB-54379: Cryo-EM structure of Posidonia oceanica PSI-LHCI supercomplex - Consensus map
Method: EM (single particle) / Resolution: 2.83 Å

EMDB-54380: Cryo-EM structure of Posidonia oceanica PSI-LHCI supercomplex - PSI core focused map
Method: EM (single particle) / Resolution: 2.79 Å

EMDB-54396: Cryo-EM structure of Posidonia oceanica PSI-LHCI supercomplex - LHCI belt focused map
Method: EM (single particle) / Resolution: 3.06 Å

EMDB-54439: Cryo-EM structure of Posidonia oceanica L-PSI-LHCI-LHCII supercomplex
Method: EM (single particle) / Resolution: 3.31 Å

EMDB-54441: Cryo-EM structure of Posidonia oceanica L-PSI-LHCI-LHCII supercomplex - PSI core focused map
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-54443: Cryo-EM structure of Posidonia oceanica L-PSI-LHCI-LHCII supercomplex - LHCI belt focused map
Method: EM (single particle) / Resolution: 3.43 Å

EMDB-54444: Cryo-EM structure of Posidonia oceanica L-PSI-LHCI-LHCII supercomplex - Lhca1-Lhca4 + LHCII focused map
Method: EM (single particle) / Resolution: 3.78 Å

54455

9s1l

EMDB-54455: Cryo-EM structure of Posidonia oceanica PSI-LHCI supercomplex - Composite map
PDB-9s1l: Cryo-EM structure of Posidonia oceanica PSI-LHCI supercomplex
Method: EM (single particle) / Resolution: 2.83 Å

54456

9s1m

EMDB-54456, PDB-9s1m:
Cryo-EM structure of Posidonia oceanica L-PSI-LHCI-LHCII supercomplex
Method: EM (single particle) / Resolution: 3.31 Å

Chemicals

ChemComp-CHL:
CHLOROPHYLL B

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-LUT:
(3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL

ChemComp-XAT:
(3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL

ChemComp-BCR:
BETA-CAROTENE

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

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

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

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-NEX:
(1R,3R)-6-{(3E,5E,7E,9E,11E,13E,15E,17E)-18-[(1S,4R,6R)-4-HYDROXY-2,2,6-TRIMETHYL-7-OXABICYCLO[4.1.0]HEPT-1-YL]-3,7,12,16-TETRAMETHYLOCTADECA-1,3,5,7,9,11,13,15,17-NONAENYLIDENE}-1,5,5-TRIMETHYLCYCLOHEXANE-1,3-DIOL

Source
  • posidonia oceanica (plant)
KeywordsPHOTOSYNTHESIS / Photosystem I / PSI-LHCI / Posidonia oceanica / large PSI-LHCI-LHCII / L-PSI-LHCI-LHCII

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