Structural features of the diatom photosystem II-light-harvesting antenna complex.
diatom
energy transfer
fucoxanthin
light harvesting
photosystem
Journal
The FEBS journal
ISSN: 1742-4658
Titre abrégé: FEBS J
Pays: England
ID NLM: 101229646
Informations de publication
Date de publication:
06 2020
06 2020
Historique:
received:
06
11
2019
revised:
05
12
2019
accepted:
17
12
2019
pubmed:
20
12
2019
medline:
23
4
2021
entrez:
20
12
2019
Statut:
ppublish
Résumé
In photosynthesis, light energy is captured by pigments bound to light-harvesting antenna proteins (LHC) that then transfer the energy to the photosystem (PS) cores to initiate photochemical reactions. The LHC proteins surround the PS cores to form PS-LHC supercomplexes. In order to adapt to a wide range of light environments, photosynthetic organisms have developed a large variety of pigments and antenna proteins to utilize the light energy efficiently under different environments. Diatoms are a group of important eukaryotic algae and possess fucoxanthin (Fx) chlorophyll a/c proteins (FCP) as antenna which have exceptional capabilities of harvesting blue-green light under water and dissipate excess energy under strong light conditions. We have solved the structure of a PSII-FCPII supercomplex from a centric diatom Chaetoceros gracilis by cryo-electron microscopy, and also the structure of an isolated FCP dimer from a pennate diatom Phaeodactylum tricornutum by X-ray crystallography at a high resolution. These results revealed the oligomerization states of FCPs distinctly different from those of LHCII found in the green lineage organisms, the detailed binding patterns of Chl c and Fxs, a huge pigment network, and extensive protein-protein, pigment-protein, and pigment-pigment interactions within the PSII-FCPII supercomplex. These results therefore provide a solid structural basis for examining the detailed mechanisms of the highly efficient energy transfer and quenching processes in diatoms.
Substances chimiques
Light-Harvesting Protein Complexes
0
Photosystem II Protein Complex
0
Xanthophylls
0
fucoxanthin
06O0TC0VSM
Chlorophyll A
YF5Q9EJC8Y
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Review
Langues
eng
Sous-ensembles de citation
IM
Pagination
2191-2200Informations de copyright
© 2019 Federation of European Biochemical Societies.
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