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Structure paper

TitleStructural insight into light harvesting for photosystem II in green algae.
Journal, issue, pagesNat Plants, Vol. 5, Issue 12, Page 1320-1330, Year 2019
Publish dateNov 25, 2019
AuthorsXin Sheng / Akimasa Watanabe / Anjie Li / Eunchul Kim / Chihong Song / Kazuyoshi Murata / Danfeng Song / Jun Minagawa / Zhenfeng Liu /
PubMed AbstractGreen algae and plants rely on light-harvesting complex II (LHCII) to collect photon energy for oxygenic photosynthesis. In Chlamydomonas reinhardtii, LHCII molecules associate with photosystem II ...Green algae and plants rely on light-harvesting complex II (LHCII) to collect photon energy for oxygenic photosynthesis. In Chlamydomonas reinhardtii, LHCII molecules associate with photosystem II (PSII) to form various supercomplexes, including the CSML type, which is the largest PSII-LHCII supercomplex in algae and plants that is presently known. Here, we report high-resolution cryo-electron microscopy (cryo-EM) maps and structural models of the CSML and CS supercomplexes from C. reinhardtii. The CS supercomplex contains an LhcbM1-LhcbM2/7-LhcbM3 heterotrimer in the strongly associated LHCII, and the LhcbM1 subunit assembles with CP43 through two interfacial galactolipid molecules. The loosely and moderately associated LHCII trimers interact closely with the minor antenna complex CP29 to form an intricate subcomplex bound to CP47 in the CSML supercomplex. A notable direct pathway is established for energy transfer from the loosely associated LHCII to the PSII reaction centre, as well as several indirect routes. Structure-based computational analysis on the excitation energy transfer within the two supercomplexes provides detailed mechanistic insights into the light-harvesting process in green algae.
External linksNat Plants / PubMed:31768031
MethodsEM (single particle)
Resolution2.7 - 3.4 Å
Structure data

9955

6kac

EMDB-9955, PDB-6kac:
Cryo-EM structure of the C2S2-type PSII-LHCII supercomplex from Chlamydomonas reihardtii
Method: EM (single particle) / Resolution: 2.7 Å

9956

6kad

EMDB-9956, PDB-6kad:
Cryo-EM structure of the C2S2M2L2-type PSII-LHCII supercomplex from Chlamydomonas reihardtii
Method: EM (single particle) / Resolution: 3.4 Å

Chemicals

ChemComp-OEX:
CA-MN4-O5 CLUSTER

ChemComp-FE2:
Unknown entry

ChemComp-CL:
Unknown entry / Chloride

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

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

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-CHL:
CHLOROPHYLL B / Chlorophyll b

ChemComp-LUT:
(3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL / Lutein

ChemComp-XAT:
(3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL / Violaxanthin

ChemComp-NEX:
(1R,3R)-6-{(3E,5E,7E,9E,11E,13E,15E,17E)-18-[(1S,4R,6R)-4-HYDROXY-2,2,6-TRIMETHYL-7-OXABICYCLO[4.1.0]HEPT-1-YL]-3,7,12,16-TETRAMETHYLOCTADECA-1,3,5,7,9,11,13,15,17-NONAENYLIDENE}-1,5,5-TRIMETHYLCYCLOHEXANE-1,3-DIOL

ChemComp-HOH:
WATER / Water

Source
  • chlamydomonas reinhardtii (plant)
KeywordsPHOTOSYNTHESIS / PhotosystemII / supercomplex

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