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Structure paper

TitleStructure and energy transfer pathways of the Dunaliella Salina photosystem I supercomplex.
Journal, issue, pagesBiochim Biophys Acta Bioenerg, Vol. 1861, Issue 10, Page 148253, Year 2020
Publish dateOct 1, 2020
AuthorsIdo Caspy / Tirupathi Malavath / Daniel Klaiman / Maria Fadeeva / Yoel Shkolnisky / Nathan Nelson /
PubMed AbstractOxygenic photosynthesis evolved more than 3 billion years ago in cyanobacteria. The increased complexity of photosystem I (PSI) became apparent from the high-resolution structures that were obtained ...Oxygenic photosynthesis evolved more than 3 billion years ago in cyanobacteria. The increased complexity of photosystem I (PSI) became apparent from the high-resolution structures that were obtained for the complexes that were isolated from various organisms, ranging from cyanobacteria to plants. These complexes are all evolutionarily linked. In this paper, the researchers have uncovered the increased complexity of PSI in a single organism demonstrated by the coexistance of two distinct PSI compositions. The Large Dunaliella PSI contains eight additional subunits, six in PSI core and two light harvesting complexes. Two additional chlorophyll a molecules pertinent for efficient excitation energy transfer in state II transition were identified in PsaL and PsaO. Short distances between these newly identified chlorophylls correspond with fast excitation transfer rates previously reported during state II transition. The apparent PSI conformations could be a coping mechanism for the high salinity.
External linksBiochim Biophys Acta Bioenerg / PubMed:32569661
MethodsEM (single particle)
Resolution2.84 - 3.4 Å
Structure data

10236

6sl5

EMDB-10236, PDB-6sl5:
Dunaliella Photosystem I Supercomplex
Method: EM (single particle) / Resolution: 2.84 Å

10995

6yxr

EMDB-10995, PDB-6yxr:
Dunaliella Minimal Photosystem I
Method: EM (single particle) / Resolution: 3.4 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER / Chlorophyll a

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

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

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

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

ChemComp-OCD:
octadecanal / Octadecanal

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-CA:
Unknown entry

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

ChemComp-4RF:
Tripalmitoylglycerol / Tripalmitin

ChemComp-PTY:
PHOSPHATIDYLETHANOLAMINE / phospholipid*YM / Phosphatidylethanolamine

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-CHL:
CHLOROPHYLL B / Chlorophyll b

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

ChemComp-LMK:
trimethyl-[(2~{R})-1-oxidanyl-1-oxidanylidene-4-[(2~{S})-2-[(1~{S})-1-oxidanyloctadecoxy]-3-[(1~{R})-1-oxidanyloctadecoxy]propoxy]butan-2-yl]azanium

ChemComp-P3H:
[(2~{R})-1-nonanoyloxy-3-[oxidanyl-[(2~{R},3~{S},5~{R},6~{R})-2,3,4,5,6-pentakis(oxidanyl)cyclohexyl]oxy-phosphoryl]oxy-propan-2-yl] (5~{Z},8~{Z})-heptadeca-5,8-dienoate

Source
  • dunaliella salina (plant)
  • Green alga (plant)
KeywordsPHOTOSYNTHESIS / membrane complex / photosystem I / dunaliella / light harvesting / excitation transfer

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