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Structure paper

TitleStructure of the maize photosystem I supercomplex with light-harvesting complexes I and II.
Journal, issue, pagesScience, Vol. 360, Issue 6393, Page 1109-1113, Year 2018
Publish dateJun 8, 2018
AuthorsXiaowei Pan / Jun Ma / Xiaodong Su / Peng Cao / Wenrui Chang / Zhenfeng Liu / Xinzheng Zhang / Mei Li /
PubMed AbstractPlants regulate photosynthetic light harvesting to maintain balanced energy flux into photosystems I and II (PSI and PSII). Under light conditions favoring PSII excitation, the PSII antenna, light- ...Plants regulate photosynthetic light harvesting to maintain balanced energy flux into photosystems I and II (PSI and PSII). Under light conditions favoring PSII excitation, the PSII antenna, light-harvesting complex II (LHCII), is phosphorylated and forms a supercomplex with PSI core and the PSI antenna, light-harvesting complex I (LHCI). Both LHCI and LHCII then transfer excitation energy to the PSI core. We report the structure of maize PSI-LHCI-LHCII solved by cryo-electron microscopy, revealing the recognition site between LHCII and PSI. The PSI subunits PsaN and PsaO are observed at the PSI-LHCI interface and the PSI-LHCII interface, respectively. Each subunit relays excitation to PSI core through a pair of chlorophyll molecules, thus revealing previously unseen paths for energy transfer between the antennas and the PSI core.
External linksScience / PubMed:29880686
MethodsEM (single particle)
Resolution3.3 Å
Structure data

6932

5zji

EMDB-6932, PDB-5zji:
Structure of photosystem I supercomplex with light-harvesting complexes I and II
Method: EM (single particle) / Resolution: 3.3 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-BCR:
BETA-CAROTENE / Β-Carotene

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

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

ChemComp-CL0:
CHLOROPHYLL A ISOMER / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

ChemComp-SF4:
IRON/SULFUR CLUSTER / Iron–sulfur cluster

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

Source
  • zea mays (maize)
  • maize (maize)
  • zea mays subsp. mays (maize)
KeywordsMEMBRANE PROTEIN / Photosystem / Antenna / Supercomplex / State transition

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