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TitleLocating the missing chlorophylls f in far-red photosystem I.
Journal, issue, pagesScience, Vol. 390, Issue 6778, Page eado6830, Year 2025
Publish dateDec 11, 2025
AuthorsGiovanni Consoli / Fiazall Tufail / Ho Fong Leong / Stefania Viola / Geoffry A Davis / Nicholas Rew / Daniel Medranda / Michael Hofer / Paul Simpson / Marco Sandrin / Benoit Chachuat / Jenny Nelson / Thomas Renger / James W Murray / Andrea Fantuzzi / A William Rutherford /
PubMed AbstractThe discovery of chlorophyll f-containing photosystems, with their long-wavelength photochemistry, represented a distinct, low-energy paradigm for oxygenic photosynthesis. Structural studies on ...The discovery of chlorophyll f-containing photosystems, with their long-wavelength photochemistry, represented a distinct, low-energy paradigm for oxygenic photosynthesis. Structural studies on chlorophyll f-containing photosystem I could identify some chlorophyll f sites, but none among the photochemically active pigments, and thus concluded that chlorophyll f plays no photochemical role. Here, we report two cryo-electron microscopy structures of far-red photosystem I from PCC 7203, allowing the assignment of eight chlorophyll f molecules, including the redox active A. Simulations of absorption difference spectra induced by charge separation indicated that the experimental spectra can be reproduced only by considering the presence of a chlorophyll f at the A site. The chlorophyll f locations, wavelength assignments, and conserved far-red-specific residues provide functional insights for efficient use of long-wavelength photons.
External linksScience / PubMed:41066538
MethodsEM (single particle)
Resolution1.89 - 2.01 Å
Structure data

50063

9eys

EMDB-50063, PDB-9eys:
Structure of Far-Red Photosystem I from C. thermalis PCC 7203
Method: EM (single particle) / Resolution: 2.01 Å

52762

9i9l

EMDB-52762, PDB-9i9l:
Structure of Far-Red Photosystem I from C. thermalis PCC 7203
Method: EM (single particle) / Resolution: 1.89 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER


ChemComp, No image

ChemComp-F6C:
Chlorophyll F

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-LFA:
EICOSANE

ChemComp-CA:
Unknown entry

ChemComp-HOH:
WATER

Source
  • C. thermalis (bacteria)
  • chroococcidiopsis thermalis pcc 7203 (bacteria)
KeywordsPHOTOSYNTHESIS / Chlorophyll f / Photosystem I / Far-red / cyanobacteria

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