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TitleStructure of a minimal photosystem I from the green alga Dunaliella salina.
Journal, issue, pagesNat Plants, Vol. 6, Issue 3, Page 321-327, Year 2020
Publish dateMar 2, 2020
AuthorsAnnemarie Perez-Boerema / Daniel Klaiman / Ido Caspy / Sigal Y Netzer-El / Alexey Amunts / Nathan Nelson /
PubMed AbstractSolar energy harnessed by oxygenic photosynthesis supports most of the life forms on Earth. In eukaryotes, photosynthesis occurs in chloroplasts and is achieved by membrane-embedded macromolecular ...Solar energy harnessed by oxygenic photosynthesis supports most of the life forms on Earth. In eukaryotes, photosynthesis occurs in chloroplasts and is achieved by membrane-embedded macromolecular complexes that contain core and peripheral antennae with multiple pigments. The structure of photosystem I (PSI) comprises the core and light-harvesting (LHCI) complexes, which together form PSI-LHCI. Here we determined the structure of PSI-LHCI from the salt-tolerant green alga Dunaliella salina using X-ray crystallography and electron cryo-microscopy. Our results reveal a previously undescribed configuration of the PSI core. It is composed of only 7 subunits, compared with 14-16 subunits in plants and the alga Chlamydomonas reinhardtii, and forms the smallest known PSI. The LHCI is poorly conserved at the sequence level and binds to pigments that form new energy pathways, and the interactions between the individual Lhca1-4 proteins are weakened. Overall, the data indicate the PSI of D. salina represents a different type of the molecular organization that provides important information for reconstructing the plasticity and evolution of PSI.
External linksNat Plants / PubMed:32123351
MethodsEM (single particle) / X-ray diffraction
Resolution3.2 - 3.4 Å
Structure data

4883

6rhz

EMDB-4883, PDB-6rhz:
Structure of a minimal photosystem I from a green alga
Method: EM (single particle) / Resolution: 3.2 Å

PDB-6qph:
Dunaliella minimal PSI complex
Method: X-RAY DIFFRACTION / Resolution: 3.4 Å

Chemicals

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-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-CHL:
CHLOROPHYLL B / Chlorophyll b

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

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

ChemComp-SQD:
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL

ChemComp-CAC:
CACODYLATE ION / Cacodylic acid

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-GSH:
GLUTATHIONE / Glutathione

ChemComp-CL0:
CHLOROPHYLL A ISOMER / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

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

ChemComp-CA:
Unknown entry

Source
  • dunaliella salina (plant)
  • Green alga (plant)
KeywordsPHOTOSYNTHESIS / Photosystem I / Dunaliella / Electron Transport / green algae

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