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Structure paper

TitleCryo-EM structure of a plant photosystem II supercomplex with light-harvesting protein Lhcb8 and α-tocopherol.
Journal, issue, pagesNat Plants, Vol. 9, Issue 8, Page 1359-1369, Year 2023
Publish dateAug 7, 2023
AuthorsMonika Opatíková / Dmitry A Semchonok / David Kopečný / Petr Ilík / Pavel Pospíšil / Iva Ilíková / Pavel Roudnický / Sanja Ćavar Zeljković / Petr Tarkowski / Fotis L Kyrilis / Farzad Hamdi / Panagiotis L Kastritis / Roman Kouřil /
PubMed AbstractThe heart of oxygenic photosynthesis is the water-splitting photosystem II (PSII), which forms supercomplexes with a variable amount of peripheral trimeric light-harvesting complexes (LHCII). Our ...The heart of oxygenic photosynthesis is the water-splitting photosystem II (PSII), which forms supercomplexes with a variable amount of peripheral trimeric light-harvesting complexes (LHCII). Our knowledge of the structure of green plant PSII supercomplex is based on findings obtained from several representatives of green algae and flowering plants; however, data from a non-flowering plant are currently missing. Here we report a cryo-electron microscopy structure of PSII supercomplex from spruce, a representative of non-flowering land plants, at 2.8 Å resolution. Compared with flowering plants, PSII supercomplex in spruce contains an additional Ycf12 subunit, Lhcb4 protein is replaced by Lhcb8, and trimeric LHCII is present as a homotrimer of Lhcb1. Unexpectedly, we have found α-tocopherol (α-Toc)/α-tocopherolquinone (α-TQ) at the boundary between the LHCII trimer and the inner antenna CP43. The molecule of α-Toc/α-TQ is located close to chlorophyll a614 of one of the Lhcb1 proteins and its chromanol/quinone head is exposed to the thylakoid lumen. The position of α-Toc in PSII supercomplex makes it an ideal candidate for the sensor of excessive light, as α-Toc can be oxidized to α-TQ by high-light-induced singlet oxygen at low lumenal pH. The molecule of α-TQ appears to shift slightly into the PSII supercomplex, which could trigger important structure-functional modifications in PSII supercomplex. Inspection of the previously reported cryo-electron microscopy maps of PSII supercomplexes indicates that α-Toc/α-TQ can be present at the same site also in PSII supercomplexes from flowering plants, but its identification in the previous studies has been hindered by insufficient resolution.
External linksNat Plants / PubMed:37550369
MethodsEM (single particle)
Resolution2.785 Å
Structure data

16389

8c29

EMDB-16389: Cryo-EM structure of photosystem II C2S2 supercomplex from Norway spruce (Picea babies) at 2.8 Angstrom resolution
PDB-8c29: Cryo-EM structure of photosystem II C2S2 supercomplex from Norway spruce (Picea abies) at 2.8 Angstrom resolution
Method: EM (single particle) / Resolution: 2.785 Å

Chemicals

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

ChemComp-3PH:
1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE / Phosphatidic acid

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-LNL:
ALPHA-LINOLENIC ACID / Alpha-Linolenic acid

ChemComp-PAM:
PALMITOLEIC ACID / Palmitoleic acid

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-MG:
Unknown entry

ChemComp-VIV:
(2R)-2,5,7,8-TETRAMETHYL-2-[(4R,8R)-4,8,12-TRIMETHYLTRIDECYL]CHROMAN-6-OL / Α-Tocopherol

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

ChemComp-DGA:
DIACYL GLYCEROL / Diglyceride

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE / Heme B

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-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-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-HOH:
WATER / Water

Source
  • picea abies (Norway spruce)
KeywordsMEMBRANE PROTEIN / Membrane protein complex / Photosynthesis / Photosystem / Gymnosperm

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