Structure of cryptophyte photosystem II-light-harvesting antennae supercomplex.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
12 Jun 2024
12 Jun 2024
Historique:
received:
16
01
2024
accepted:
06
06
2024
medline:
13
6
2024
pubmed:
13
6
2024
entrez:
12
6
2024
Statut:
epublish
Résumé
Cryptophytes are ancestral photosynthetic organisms evolved from red algae through secondary endosymbiosis. They have developed alloxanthin-chlorophyll a/c2-binding proteins (ACPs) as light-harvesting complexes (LHCs). The distinctive properties of cryptophytes contribute to efficient oxygenic photosynthesis and underscore the evolutionary relationships of red-lineage plastids. Here we present the cryo-electron microscopy structure of the Photosystem II (PSII)-ACPII supercomplex from the cryptophyte Chroomonas placoidea. The structure includes a PSII dimer and twelve ACPII monomers forming four linear trimers. These trimers structurally resemble red algae LHCs and cryptophyte ACPI trimers that associate with Photosystem I (PSI), suggesting their close evolutionary links. We also determine a Chl a-binding subunit, Psb-γ, essential for stabilizing PSII-ACPII association. Furthermore, computational calculation provides insights into the excitation energy transfer pathways. Our study lays a solid structural foundation for understanding the light-energy capture and transfer in cryptophyte PSII-ACPII, evolutionary variations in PSII-LHCII, and the origin of red-lineage LHCIIs.
Identifiants
pubmed: 38866834
doi: 10.1038/s41467-024-49453-0
pii: 10.1038/s41467-024-49453-0
doi:
Substances chimiques
Photosystem II Protein Complex
0
Light-Harvesting Protein Complexes
0
Photosystem I Protein Complex
0
Chlorophyll A
YF5Q9EJC8Y
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
4999Subventions
Organisme : Royal Society
ID : URF\R\180030
Informations de copyright
© 2024. The Author(s).
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