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Structure paper

TitleThe pigment-protein network of a diatom photosystem II-light-harvesting antenna supercomplex.
Journal, issue, pagesScience, Vol. 365, Issue 6452, Year 2019
Publish dateAug 2, 2019
AuthorsXiong Pi / Songhao Zhao / Wenda Wang / Desheng Liu / Caizhe Xu / Guangye Han / Tingyun Kuang / Sen-Fang Sui / Jian-Ren Shen /
PubMed AbstractDiatoms play important roles in global primary productivity and biogeochemical cycling of carbon, in part owing to the ability of their photosynthetic apparatus to adapt to rapidly changing light ...Diatoms play important roles in global primary productivity and biogeochemical cycling of carbon, in part owing to the ability of their photosynthetic apparatus to adapt to rapidly changing light intensity. We report a cryo-electron microscopy structure of the photosystem II (PSII)-fucoxanthin (Fx) chlorophyll (Chl) a/c binding protein (FCPII) supercomplex from the centric diatom The supercomplex comprises two protomers, each with two tetrameric and three monomeric FCPIIs around a PSII core that contains five extrinsic oxygen-evolving proteins at the lumenal surface. The structure reveals the arrangement of a huge pigment network that contributes to efficient light energy harvesting, transfer, and dissipation processes in the diatoms.
External linksScience / PubMed:31371578
MethodsEM (single particle)
Resolution3.02 Å
Structure data

9839

6jlu

EMDB-9839, PDB-6jlu:
Structure of PSII-FCP supercomplex from a centric diatom Chaetoceros gracilis at 3.02 angstrom resolution
Method: EM (single particle) / Resolution: 3.02 Å

Chemicals

ChemComp-OEX:
CA-MN4-O5 CLUSTER

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

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

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-CL:
Unknown entry / Chloride

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE / Heme B

ChemComp-KC1:
Chlorophyll c1 / Chlorophyll c

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-DD6:
(3S,3'R,5R,6S,7cis)-7',8'-didehydro-5,6-dihydro-5,6-epoxy-beta,beta-carotene-3,3'-diol / Diadinoxanthin

ChemComp-KC2:
Chlorophyll c2 / Chlorophyll c

ChemComp-HOH:
WATER / Water

Source
  • chaetoceros gracilis (Diatom)
KeywordsPLANT PROTEIN / PSII-FCP supercomplex

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