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Structure paper

TitleThe structure of a triple complex of plant photosystem I with ferredoxin and plastocyanin.
Journal, issue, pagesNat Plants, Vol. 6, Issue 10, Page 1300-1305, Year 2020
Publish dateOct 5, 2020
AuthorsIdo Caspy / Anna Borovikova-Sheinker / Daniel Klaiman / Yoel Shkolnisky / Nathan Nelson /
PubMed AbstractThe ability of photosynthetic organisms to use sunlight as a sole source of energy is endowed by two large membrane complexes-photosystem I (PSI) and photosystem II (PSII). PSI and PSII are the ...The ability of photosynthetic organisms to use sunlight as a sole source of energy is endowed by two large membrane complexes-photosystem I (PSI) and photosystem II (PSII). PSI and PSII are the fundamental components of oxygenic photosynthesis, providing oxygen, food and an energy source for most living organisms on Earth. Currently, high-resolution crystal structures of these complexes from various organisms are available. The crystal structures of megadalton complexes have revealed excitation transfer and electron-transport pathways within the various complexes. PSI is defined as plastocyanin-ferredoxin oxidoreductase but a high-resolution structure of the entire triple supercomplex is not available. Here, using a new cryo-electron microscopy technique, we solve the structure of native plant PSI in complex with its electron donor plastocyanin and the electron acceptor ferredoxin. We reveal all of the contact sites and the modes of interaction between the interacting electron carriers and PSI.
External linksNat Plants / PubMed:33020607
MethodsEM (single particle)
Resolution2.5 - 2.7 Å
Structure data

10746

6yac

EMDB-10746, PDB-6yac:
Plant PSI-ferredoxin supercomplex
Method: EM (single particle) / Resolution: 2.5 Å

10798

6yez

EMDB-10798, PDB-6yez:
Plant PSI-ferredoxin-plastocyanin supercomplex
Method: EM (single particle) / Resolution: 2.7 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-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

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

ChemComp-CA:
Unknown entry

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-CHL:
CHLOROPHYLL B / Chlorophyll b

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-C7Z:
(1~{S})-3,5,5-trimethyl-4-[(1~{E},3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E},17~{E})-3,7,12,16-tetramethyl-18-[(4~{S})-2,6,6-trimethyl-4-oxidanyl-cyclohexen-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohex-3-en-1-ol

ChemComp-FES:
FE2/S2 (INORGANIC) CLUSTER / Iron–sulfur cluster

ChemComp-HOH:
WATER / Water

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

ChemComp-CU:
COPPER (II) ION / Copper

Source
  • pisum sativum (garden pea)
  • Pea (garden pea)
  • Garden pea (garden pea)
KeywordsPHOTOSYNTHESIS / Membrane complex / photosystem I / ferredoxin / light harvesting / excitation transfer

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