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Structure paper

TitleStructure of a diatom photosystem II supercomplex containing a member of Lhcx family and dimeric FCPII.
Journal, issue, pagesSci Adv, Vol. 9, Issue 43, Page eadi8446, Year 2023
Publish dateOct 27, 2023
AuthorsYue Feng / Zhenhua Li / Xiaoyi Li / Lili Shen / Xueyang Liu / Cuicui Zhou / Jinyang Zhang / Min Sang / Guangye Han / Wenqiang Yang / Tingyun Kuang / Wenda Wang / Jian-Ren Shen /
PubMed AbstractDiatoms rely on fucoxanthin chlorophyll -binding proteins (FCPs) for their great success in oceans, which have a great diversity in their pigment, protein compositions, and subunit organizations. We ...Diatoms rely on fucoxanthin chlorophyll -binding proteins (FCPs) for their great success in oceans, which have a great diversity in their pigment, protein compositions, and subunit organizations. We report a unique structure of photosystem II (PSII)-FCPII supercomplex from at 2.68-Å resolution by cryo-electron microscopy. FCPIIs within this PSII-FCPII supercomplex exist in dimers and monomers, and a homodimer and a heterodimer were found to bind to a PSII core. The FCPII homodimer is formed by Lhcf7 and associates with PSII through an Lhcx family antenna Lhcx6_1, whereas the heterodimer is formed by Lhcf6 and Lhcf11 and connects to the core together with an Lhcf5 monomer through Lhca2 monomer. An extended pigment network consisting of diatoxanthins, diadinoxanthins, fucoxanthins, and chlorophylls is revealed, which functions in efficient light harvesting, energy transfer, and dissipation. These results provide a structural basis for revealing the energy transfer and dissipation mechanisms and also for the structural diversity of FCP antennas in diatoms.
External linksSci Adv / PubMed:37878698 / PubMed Central
MethodsEM (single particle)
Resolution2.68 - 3.19 Å
Structure data

35766

8iwh

EMDB-35766, PDB-8iwh:
Structure and characteristics of a photosystem II supercomplex containing monomeric LHCX and dimeric FCPII antennae from the diatom Thalassiosira pseudonana
Method: EM (single particle) / Resolution: 2.68 Å

35899

8j0d

EMDB-35899, PDB-8j0d:
FCP heterodimer, Lhca2, and Lhcf5 together as the M1 side binds to the PSII core in the diatom Thalassiosira pseudonana
Method: EM (single particle) / Resolution: 3.19 Å

Chemicals

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

ChemComp-OEX:
CA-MN4-O5 CLUSTER

ChemComp-CL:
Unknown entry / Chloride

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PHO:
PHEOPHYTIN A / Pheophytin

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

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

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-FE2:
Unknown entry

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

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-ET4:
(1~{R})-3,5,5-trimethyl-4-[(1~{E},3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E})-3,7,12,16-tetramethyl-18-[(4~{R})-2,6,6-trimethyl-4-oxidanyl-cyclohexen-1-yl]octadeca-1,3,5,7,9,11,13,15-octaen-17-ynyl]cyclohex-3-en-1-ol

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

Source
  • thalassiosira pseudonana (Diatom)
KeywordsPHOTOSYNTHESIS / PSII supercomplex / LHCX / FCP / heterodimer

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