Structure of the red-shifted Fittonia albivenis photosystem I.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
27 Jul 2024
27 Jul 2024
Historique:
received:
06
02
2024
accepted:
11
07
2024
medline:
27
7
2024
pubmed:
27
7
2024
entrez:
26
7
2024
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 39060282
doi: 10.1038/s41467-024-50655-9
pii: 10.1038/s41467-024-50655-9
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
6325Subventions
Organisme : National Natural Science Foundation of China (National Science Foundation of China)
ID : 32270260, 32070267
Organisme : Natural Science Foundation of Shandong Province (Shandong Provincial Natural Science Foundation)
ID : ZR2019ZD48
Informations de copyright
© 2024. The Author(s).
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