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TitleStructural insights into photosystem II supercomplex and trimeric FCP antennae of a centric diatom Cyclotella meneghiniana.
Journal, issue, pagesNat Commun, Vol. 14, Issue 1, Page 8164, Year 2023
Publish dateDec 9, 2023
AuthorsSonghao Zhao / Lili Shen / Xiaoyi Li / Qiushuang Tao / Zhenhua Li / Caizhe Xu / Cuicui Zhou / Yanyan Yang / Min Sang / Guangye Han / Long-Jiang Yu / Tingyun Kuang / Jian-Ren Shen / Wenda Wang /
PubMed AbstractDiatoms are dominant marine algae and contribute around a quarter of global primary productivity, the success of which is largely attributed to their photosynthetic capacity aided by specific ...Diatoms are dominant marine algae and contribute around a quarter of global primary productivity, the success of which is largely attributed to their photosynthetic capacity aided by specific fucoxanthin chlorophyll-binding proteins (FCPs) to enhance the blue-green light absorption under water. We purified a photosystem II (PSII)-FCPII supercomplex and a trimeric FCP from Cyclotella meneghiniana (Cm) and solved their structures by cryo-electron microscopy (cryo-EM). The structures reveal detailed organizations of monomeric, dimeric and trimeric FCP antennae, as well as distinct assemblies of Lhcx6_1 and dimeric FCPII-H in PSII core. Each Cm-PSII-FCPII monomer contains an Lhcx6_1, an FCP heterodimer and other three FCP monomers, which form an efficient pigment network for harvesting energy. More diadinoxanthins and diatoxanthins are found in FCPs, which may function to quench excess energy. The trimeric FCP contains more chlorophylls c and fucoxanthins. These diversified FCPs and PSII-FCPII provide a structural basis for efficient light energy harvesting, transfer, and dissipation in C. meneghiniana.
External linksNat Commun / PubMed:38071196 / PubMed Central
MethodsEM (single particle)
Resolution2.72 - 3.48 Å
Structure data

35987

8j5k

EMDB-35987, PDB-8j5k:
Structural insights into photosystem II supercomplex and trimeric FCP antennae of a centric diatom Cyclotella meneghiniana
Method: EM (single particle) / Resolution: 2.93 Å

36054

8j7z

EMDB-36054, PDB-8j7z:
Structure of FCP trimer in Cyclotella meneghiniana
Method: EM (single particle) / Resolution: 2.72 Å

37267

8w4o

EMDB-37267, PDB-8w4o:
Structure of PSII-FCPII-G/H complex in the PSII-FCPII supercomplex from Cyclotella meneghiniana
Method: EM (single particle) / Resolution: 3.23 Å

37268

8w4p

EMDB-37268, PDB-8w4p:
Structure of PSII-FCPII-I/J/K complex in the PSII-FCPII supercomplex from Cyclotella meneghiniana
Method: EM (single particle) / Resolution: 3.48 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-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

ChemComp-CL:
Unknown entry / Chloride

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

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-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-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-KC1:
Chlorophyll c1 / Chlorophyll c

Source
  • stephanocyclus meneghinianus (Diatom)
KeywordsPHOTOSYNTHESIS / PSII-FCPII supercomplex / Cm-FCP-trimer / PSII-FCPII

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