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TitlePhotosynthesis. Structural basis for energy transfer pathways in the plant PSI-LHCI supercomplex.
Journal, issue, pagesScience, Vol. 348, Issue 6238, Page 989-995, Year 2015
Publish dateMay 29, 2015
AuthorsXiaochun Qin / Michihiro Suga / Tingyun Kuang / Jian-Ren Shen /
PubMed AbstractPhotosynthesis converts solar energy to chemical energy by means of two large pigment-protein complexes: photosystem I (PSI) and photosystem II (PSII). In higher plants, the PSI core is surrounded by ...Photosynthesis converts solar energy to chemical energy by means of two large pigment-protein complexes: photosystem I (PSI) and photosystem II (PSII). In higher plants, the PSI core is surrounded by a large light-harvesting complex I (LHCI) that captures sunlight and transfers the excitation energy to the core with extremely high efficiency. We report the structure of PSI-LHCI, a 600-kilodalton membrane protein supercomplex, from Pisum sativum (pea) at a resolution of 2.8 angstroms. The structure reveals the detailed arrangement of pigments and other cofactors—especially within LHCI—as well as numerous specific interactions between the PSI core and LHCI. These results provide a firm structural basis for our understanding on the energy transfer and photoprotection mechanisms within the PSI-LHCI supercomplex.
External linksScience / PubMed:26023133
MethodsX-ray diffraction
Resolution2.8 Å
Structure data

PDB-4xk8:
Crystal structure of plant photosystem I-LHCI super-complex at 2.8 angstrom resolution
Method: X-RAY DIFFRACTION / Resolution: 2.8 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

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

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

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

ChemComp-HTG:
heptyl 1-thio-beta-D-glucopyranoside / detergent*YM

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

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-HOH:
WATER / Water

Source
  • pisum sativum (garden pea)
KeywordsPHOTOSYNTHESIS / photosystem i / plant LHCI-PSI supercomplex

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