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Structure paper

TitleAntenna arrangement and energy transfer pathways of a green algal photosystem-I-LHCI supercomplex.
Journal, issue, pagesNat Plants, Vol. 5, Issue 3, Page 273-281, Year 2019
Publish dateMar 8, 2019
AuthorsXiaodong Su / Jun Ma / Xiaowei Pan / Xuelin Zhao / Wenrui Chang / Zhenfeng Liu / Xinzheng Zhang / Mei Li /
PubMed AbstractDuring oxygenic photosynthesis, photosystems I and II (PSI and PSII) are essential for light-driven electron transport. Excitation energy transfer in PSI occurs extremely quickly, making it an ...During oxygenic photosynthesis, photosystems I and II (PSI and PSII) are essential for light-driven electron transport. Excitation energy transfer in PSI occurs extremely quickly, making it an efficient energy converter. In the alga Chlamydomonas reinhardtii (Cr), multiple units of light-harvesting complex I (LHCI) bind to the PSI core and function as peripheral antennae, forming a PSI-LHCI supercomplex. CrPSI-LHCI shows significantly larger antennae compared with plant PSI-LHCI while maintaining highly efficient energy transfer from LHCI to PSI. Here, we report structures of CrPSI-LHCI, solved by cryo-electron microscopy, revealing that up to ten LHCIs are associated with the PSI core. The structures provide detailed information about antenna organization and pigment arrangement within the supercomplexes. Highly populated and closely associated chlorophylls in the antennae explain the high efficiency of light harvesting and excitation energy transfer in CrPSI-LHCI.
External linksNat Plants / PubMed:30850819
MethodsEM (single particle)
Resolution2.89 - 3.3 Å
Structure data

9678

6ijj

EMDB-9678, PDB-6ijj:
Photosystem I of Chlamydomonas reinhardtii
Method: EM (single particle) / Resolution: 2.89 Å

9680

6ijo

EMDB-9680, PDB-6ijo:
Photosystem I of Chlamydomonas reinhardtii
Method: EM (single particle) / Resolution: 3.3 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PQN:
PHYLLOQUINONE

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

ChemComp-BCR:
BETA-CAROTENE

ChemComp-SF4:
IRON/SULFUR CLUSTER

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

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

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
  • chlamydomonas reinhardtii (plant)
KeywordsMEMBRANE PROTEIN / Photosystem / Antenna / green alga / PHOTOSYNTHESIS / Supercomplex

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