Architecture of symbiotic dinoflagellate photosystem I-light-harvesting supercomplex in Symbiodinium.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
16 Mar 2024
16 Mar 2024
Historique:
received:
19
10
2023
accepted:
11
03
2024
medline:
18
3
2024
pubmed:
17
3
2024
entrez:
17
3
2024
Statut:
epublish
Résumé
Symbiodinium are the photosynthetic endosymbionts for corals and play a vital role in supplying their coral hosts with photosynthetic products, forming the nutritional foundation for high-yield coral reef ecosystems. Here, we determine the cryo-electron microscopy structure of Symbiodinium photosystem I (PSI) supercomplex with a PSI core composed of 13 subunits including 2 previously unidentified subunits, PsaT and PsaU, as well as 13 peridinin-Chl a/c-binding light-harvesting antenna proteins (AcpPCIs). The PSI-AcpPCI supercomplex exhibits distinctive structural features compared to their red lineage counterparts, including extended termini of PsaD/E/I/J/L/M/R and AcpPCI-1/3/5/7/8/11 subunits, conformational changes in the surface loops of PsaA and PsaB subunits, facilitating the association between the PSI core and peripheral antennae. Structural analysis and computational calculation of excitation energy transfer rates unravel specific pigment networks in Symbiodinium PSI-AcpPCI for efficient excitation energy transfer. Overall, this study provides a structural basis for deciphering the mechanisms governing light harvesting and energy transfer in Symbiodinium PSI-AcpPCI supercomplexes adapted to their symbiotic ecosystem, as well as insights into the evolutionary diversity of PSI-LHCI among various photosynthetic organisms.
Identifiants
pubmed: 38493166
doi: 10.1038/s41467-024-46791-x
pii: 10.1038/s41467-024-46791-x
doi:
Substances chimiques
Photosystem I Protein Complex
0
Light-Harvesting Protein Complexes
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
2392Subventions
Organisme : RCUK | Biotechnology and Biological Sciences Research Council (BBSRC)
ID : BB/V009729/1
Organisme : RCUK | Biotechnology and Biological Sciences Research Council (BBSRC)
ID : BB/R003890/1
Organisme : Royal Society
ID : URF\R\180030
Informations de copyright
© 2024. The Author(s).
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