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TitleStructure of the red-shifted Fittonia albivenis photosystem I.
Journal, issue, pagesNat Commun, Vol. 15, Issue 1, Page 6325, Year 2024
Publish dateJul 27, 2024
AuthorsXiuxiu Li / Guoqiang Huang / Lixia Zhu / Chenyang Hao / Sen-Fang Sui / Xiaochun Qin /
PubMed AbstractPhotosystem I (PSI) from Fittonia albivenis, an Acanthaceae ornamental plant, is notable among green plants for its red-shifted emission spectrum. Here, we solved the structure of a PSI-light ...Photosystem I (PSI) from Fittonia albivenis, an Acanthaceae ornamental plant, is notable among green plants for its red-shifted emission spectrum. Here, we solved the structure of a PSI-light harvesting complex I (LHCI) supercomplex from F. albivenis at 2.46-Å resolution using cryo-electron microscopy. The supercomplex contains a core complex of 14 subunits and an LHCI belt with four antenna subunits (Lhca1-4) similar to previously reported angiosperm PSI-LHCI structures; however, Lhca3 differs in three regions surrounding a dimer of low-energy chlorophylls (Chls) termed red Chls, which absorb far-red beyond visible light. The unique amino acid sequences within these regions are exclusively shared by plants with strongly red-shifted fluorescence emission, suggesting candidate structural elements for regulating the energy state of red Chls. These results provide a structural basis for unraveling the mechanisms of light harvest and transfer in PSI-LHCI of under canopy plants and for designing Lhc to harness longer-wavelength light in the far-red spectral range.
External linksNat Commun / PubMed:39060282 / PubMed Central
MethodsEM (single particle)
Resolution2.4 Å
Structure data

37513

8wgh

EMDB-37513, PDB-8wgh:
Cryo-EM structure of the red-shifted Fittonia albivenis PSI-LHCI
Method: EM (single particle) / Resolution: 2.4 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-HTG:
heptyl 1-thio-beta-D-glucopyranoside / detergent*YM

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

Source
  • fittonia albivenis (plant)
KeywordsPHOTOSYNTHESIS / Complex

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