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Structure paper

TitleStructural basis for energy harvesting and dissipation in a diatom PSII-FCPII supercomplex.
Journal, issue, pagesNat Plants, Vol. 5, Issue 8, Page 890-901, Year 2019
Publish dateJul 29, 2019
AuthorsRyo Nagao / Koji Kato / Takehiro Suzuki / Kentaro Ifuku / Ikuo Uchiyama / Yasuhiro Kashino / Naoshi Dohmae / Seiji Akimoto / Jian-Ren Shen / Naoyuki Miyazaki / Fusamichi Akita /
PubMed AbstractLight-harvesting antenna systems in photosynthetic organisms harvest solar energy and transfer it to the photosynthetic reaction centres to initiate charge-separation and electron-transfer reactions. ...Light-harvesting antenna systems in photosynthetic organisms harvest solar energy and transfer it to the photosynthetic reaction centres to initiate charge-separation and electron-transfer reactions. Diatoms are one of the important groups of oxyphototrophs and possess fucoxanthin chlorophyll a/c-binding proteins (FCPs) as light harvesters. The organization and association pattern of FCP with the photosystem II (PSII) core are unknown. Here we solved the structure of PSII-FCPII supercomplexes isolated from a diatom, Chaetoceros gracilis, by single-particle cryoelectron microscopy. The PSII-FCPII forms a homodimer. In each monomer, two FCP homotetramers and three FCP monomers are associated with one PSII core. The structure reveals a highly complicated protein-pigment network that is different from the green-type light-harvesting apparatus. Comparing these two systems allows the identification of energy transfer and quenching pathways. These findings provide structural insights into not only excitation-energy transfer mechanisms in the diatom PSII-FCPII, but also changes of light harvesters between the red- and green-lineage oxyphototrophs during evolution.
External linksNat Plants / PubMed:31358960
MethodsEM (single particle)
Resolution3.3 - 3.8 Å
Structure data

9775

6j3y

EMDB-9775, PDB-6j3y:
Structure of C2S2-type PSII-FCPII supercomplex from diatom
Method: EM (single particle) / Resolution: 3.3 Å

9776

6j3z

EMDB-9776, PDB-6j3z:
Structure of C2S1M1-type PSII-FCPII supercomplex from diatom
Method: EM (single particle) / Resolution: 3.6 Å

9777

6j40

EMDB-9777, PDB-6j40:
Structure of C2S2M2-type PSII-FCPII supercomplex from diatom
Method: EM (single particle) / Resolution: 3.8 Å

Chemicals

ChemComp-FE2:
Unknown entry

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PHO:
PHEOPHYTIN A / Pheophytin

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

ChemComp-SQD:
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL

ChemComp-BCT:
BICARBONATE ION / pH buffer*YM / Bicarbonate

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM / Phosphatidylglycerol

ChemComp-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

ChemComp-OEX:
CA-MN4-O5 CLUSTER

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-PL9:
2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE / Plastoquinone

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE / Heme B

ChemComp-A86:
(3S,3'S,5R,5'R,6S,6'R,8'R)-3,5'-dihydroxy-8-oxo-6',7'-didehydro-5,5',6,6',7,8-hexahydro-5,6-epoxy-beta,beta-caroten-3'- / Fucoxanthin

ChemComp-LMU:
DODECYL-ALPHA-D-MALTOSIDE / detergent*YM

Source
  • chaetoceros gracilis (Diatom)
KeywordsELECTRON TRANSPORT / Photosystem

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