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TitleEnergetic robustness to large scale structural fluctuations in a photosynthetic supercomplex.
Journal, issue, pagesNat Commun, Vol. 14, Issue 1, Page 4650, Year 2023
Publish dateAug 2, 2023
AuthorsDvir Harris / Hila Toporik / Gabriela S Schlau-Cohen / Yuval Mazor /
PubMed AbstractPhotosynthetic organisms transport and convert solar energy with near-unity quantum efficiency using large protein supercomplexes held in flexible membranes. The individual proteins position ...Photosynthetic organisms transport and convert solar energy with near-unity quantum efficiency using large protein supercomplexes held in flexible membranes. The individual proteins position chlorophylls to tight tolerances considered critical for fast and efficient energy transfer. The variability in protein organization within the supercomplexes, and how efficiency is maintained despite variability, had been unresolved. Here, we report on structural heterogeneity in the 2-MDa cyanobacterial PSI-IsiA photosynthetic supercomplex observed using Cryo-EM, revealing large-scale variances in the positions of IsiA relative to PSI. Single-molecule measurements found efficient IsiA-to-PSI energy transfer across all conformations, along with signatures of transiently decoupled IsiA. Structure based calculations showed that rapid IsiA-to-PSI energy transfer is always maintained, and even increases by three-fold in rare conformations via IsiA-specific chls. We postulate that antennae design mitigates structural fluctuations, providing a mechanism for robust energy transfer in the flexible membrane.
External linksNat Commun / PubMed:37532717 / PubMed Central
MethodsEM (single particle)
Resolution2.6 Å
Structure data

26601

7umh

EMDB-26601, PDB-7umh:
Energetic robustness to large scale structural dynamics in a photosynthetic supercomplex
Method: EM (single particle) / Resolution: 2.6 Å

Chemicals

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

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

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-BCR:
BETA-CAROTENE

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

ChemComp-ECH:
beta,beta-caroten-4-one

ChemComp-CA:
Unknown entry

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

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

ChemComp-HOH:
WATER

Source
  • synechocystis sp. pcc 6803 (bacteria)
KeywordsPHOTOSYNTHESIS / photosystem I / antenna / cyanobacteria / membrane complex

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