Structure of the green algal photosystem I supercomplex with a decameric light-harvesting complex I.
Journal
Nature plants
ISSN: 2055-0278
Titre abrégé: Nat Plants
Pays: England
ID NLM: 101651677
Informations de publication
Date de publication:
06 2019
06 2019
Historique:
received:
13
11
2018
accepted:
02
05
2019
entrez:
12
6
2019
pubmed:
12
6
2019
medline:
28
8
2019
Statut:
ppublish
Résumé
In plants and green algae, the core of photosystem I (PSI) is surrounded by a peripheral antenna system consisting of light-harvesting complex I (LHCI). Here we report the cryo-electron microscopic structure of the PSI-LHCI supercomplex from the green alga Chlamydomonas reinhardtii. The structure reveals that eight Lhca proteins form two tetrameric LHCI belts attached to the PsaF side while the other two Lhca proteins form an additional Lhca2/Lhca9 heterodimer attached to the opposite side. The spatial arrangement of light-harvesting pigments reveals that Chlorophylls b are more abundant in the outer LHCI belt than in the inner LHCI belt and are absent from the core, thereby providing the downhill energy transfer pathways to the PSI core. PSI-LHCI is complexed with a plastocyanin on the patch of lysine residues of PsaF at the luminal side. The assembly provides a structural basis for understanding the mechanism of light-harvesting, excitation energy transfer of the PSI-LHCI supercomplex and electron transfer with plastocyanin.
Identifiants
pubmed: 31182847
doi: 10.1038/s41477-019-0438-4
pii: 10.1038/s41477-019-0438-4
doi:
Substances chimiques
Light-Harvesting Protein Complexes
0
Membrane Proteins
0
Photosystem I Protein Complex
0
Plastocyanin
9014-09-9
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
626-636Références
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