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Structure paper

TitleStructure and assembly mechanism of plant CSM-type PSII-LHCII supercomplex.
Journal, issue, pagesScience, Vol. 357, Issue 6353, Page 815-820, Year 2017
Publish dateAug 25, 2017
AuthorsXiaodong Su / Jun Ma / Xuepeng Wei / Peng Cao / Dongjie Zhu / Wenrui Chang / Zhenfeng Liu / Xinzheng Zhang / Mei Li /
PubMed AbstractIn plants, the photosynthetic machinery photosystem II (PSII) consists of a core complex associated with variable numbers of light-harvesting complexes II (LHCIIs). The supercomplex, comprising a ...In plants, the photosynthetic machinery photosystem II (PSII) consists of a core complex associated with variable numbers of light-harvesting complexes II (LHCIIs). The supercomplex, comprising a dimeric core and two strongly bound and two moderately bound LHCIIs (CSM), is the dominant form in plants acclimated to limited light. Here we report cryo-electron microscopy structures of two forms of CSM (termed stacked and unstacked) from at 2.7- and 3.2-angstrom resolution, respectively. In each CSM, the moderately bound LHCII assembles specifically with a peripheral antenna complex CP24-CP29 heterodimer and the strongly bound LHCII, to establish a pigment network that facilitates light harvesting at the periphery and energy transfer into the core. The high mobility of peripheral antennae, including the moderately bound LHCII and CP24, provides insights into functional regulation of plant PSII.
External linksScience / PubMed:28839073
MethodsEM (single particle)
Resolution2.7 - 3.6 Å
Structure data

6741

5xnl

EMDB-6741, PDB-5xnl:
Structure of stacked C2S2M2-type PSII-LHCII supercomplex from Pisum sativum
Method: EM (single particle) / Resolution: 2.7 Å

6742

5xnm

EMDB-6742, PDB-5xnm:
Structure of unstacked C2S2M2-type PSII-LHCII supercomplex from Pisum sativum
Method: EM (single particle) / Resolution: 3.2 Å

6743

5xnn

EMDB-6743, PDB-5xnn:
Structure of M-LHCII and CP24 complexes in the stacked C2S2M2-type PSII-LHCII supercomplex from Pisum sativum
Method: EM (single particle) / Resolution: 3.6 Å

6744

5xno

EMDB-6744, PDB-5xno:
Structure of M-LHCII and CP24 complexes in the unstacked C2S2M2-type PSII-LHCII supercomplex from Pisum sativum
Method: EM (single particle) / Resolution: 3.5 Å

Chemicals

ChemComp-CHL:
CHLOROPHYLL B / Chlorophyll b

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

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

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

ChemComp-OEX:
CA-MN4-O5 CLUSTER

ChemComp-FE2:
Unknown entry

ChemComp-CL:
Unknown entry / Chloride

ChemComp-PHO:
PHEOPHYTIN A / Pheophytin

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-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-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE / Heme B

ChemComp-HOH:
WATER / Water

Source
  • pisum sativum (garden pea)
  • Garden pea (garden pea)
KeywordsMEMBRANE PROTEIN / Photosystem II / PSII-LHCII / C2S2M2 / Supercomplex / M-LHCII and CP24 complexes / C2S2M2 supercomplex

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