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Structure paper

TitleStructure of plant photosystem I-plastocyanin complex reveals strong hydrophobic interactions.
Journal, issue, pagesBiochem J, Vol. 478, Issue 12, Page 2371-2384, Year 2021
Publish dateJun 25, 2021
AuthorsIdo Caspy / Mariia Fadeeva / Sebastian Kuhlgert / Anna Borovikova-Sheinker / Daniel Klaiman / Gal Masrati / Friedel Drepper / Nir Ben-Tal / Michael Hippler / Nathan Nelson /
PubMed AbstractPhotosystem I is defined as plastocyanin-ferredoxin oxidoreductase. Taking advantage of genetic engineering, kinetic analyses and cryo-EM, our data provide novel mechanistic insights into binding and ...Photosystem I is defined as plastocyanin-ferredoxin oxidoreductase. Taking advantage of genetic engineering, kinetic analyses and cryo-EM, our data provide novel mechanistic insights into binding and electron transfer between PSI and Pc. Structural data at 2.74 Å resolution reveals strong hydrophobic interactions in the plant PSI-Pc ternary complex, leading to exclusion of water molecules from PsaA-PsaB/Pc interface once the PSI-Pc complex forms. Upon oxidation of Pc, a slight tilt of bound oxidized Pc allows water molecules to accommodate the space between Pc and PSI to drive Pc dissociation. Such a scenario is consistent with the six times larger dissociation constant of oxidized as compared with reduced Pc and mechanistically explains how this molecular machine optimized electron transfer for fast turnover.
External linksBiochem J / PubMed:34085703 / PubMed Central
MethodsEM (single particle)
Resolution2.74 Å
Structure data

11326

6zoo

EMDB-11326, PDB-6zoo:
Photosystem I reduced Plastocyanin Complex
Method: EM (single particle) / Resolution: 2.74 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-BCR:
BETA-CAROTENE

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

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

ChemComp-CHL:
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

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

ChemComp-CU:
COPPER (II) ION

ChemComp-HOH:
WATER

Source
  • pisum sativum (garden pea)
  • Garden pea (garden pea)
KeywordsPHOTOSYNTHESIS / Photosystem I / membrane protein

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