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Structure paper

TitleMapping the absorption landscape of far-red Photosystem II.
Journal, issue, pagesNat Commun, Vol. 17, Issue 1, Year 2026
Publish dateJun 6, 2026
AuthorsHo Fong Leong / Giovanni Consoli / Geoffry A Davis / Ben Hancox-Lachman / Kenta Renard / Fiazall Tufail / Lauren E Lee / Lucas Gautier / James W Murray / Andrea Fantuzzi / A William Rutherford /
PubMed AbstractFar-red light photoacclimation enables some cyanobacteria to survive in white-light-depleted environments by extending the red limit of photosynthesis. In far-red Photosystem II, paralogous subunits ...Far-red light photoacclimation enables some cyanobacteria to survive in white-light-depleted environments by extending the red limit of photosynthesis. In far-red Photosystem II, paralogous subunits replace their canonical counterparts, allowing the incorporation of some chlorophyll f molecules and one chlorophyll d that are red-shifted and spectrally distinct from the chlorophyll a manifold, and from each other. Here, we present a comparative study of far-red Photosystem II from Chroococcidiopsis thermalis PCC 7203 and Calothrix sp. NIES-3974. In C. thermalis, the cryo-electron microscopy structure reveals the far-red-exclusive subunit, PsbH2', which forms part of a chlorophyll f binding site. We also assign four chlorophyll f sites using sequence comparisons and electrostatic potential analyses. In Calothrix, psbH2' is absent, and the same analyses show that only two of these chlorophyll f sites are present. Comparative phylogenetic, structural, and spectroscopic analyses allow the assignment of specific wavelengths to all the red-shifted chlorophylls. This provides the framework needed to model excitation energy transfer in far-red Photosystem II, and to understand the conserved features that allow survival under far-red light.
External linksNat Commun / PubMed:42248907 / PubMed Central
MethodsEM (single particle)
Resolution2.17 - 2.33 Å
Structure data

55593

9t5t

EMDB-55593, PDB-9t5t:
Chlorophyll f-containing dimeric far-red Photosystem II from Chroococcidiopsis thermalis PCC 7203
Method: EM (single particle) / Resolution: 2.17 Å

55594

9t5u

EMDB-55594, PDB-9t5u:
Chlorophyll f-containing monomeric far-red Photosystem II from Calothrix sp. NIES-3974
Method: EM (single particle) / Resolution: 2.33 Å

Chemicals

ChemComp-OEX:
CA-MN4-O5 CLUSTER

ChemComp-FE2:
Unknown entry

ChemComp-CL:
Unknown entry

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-CL7:
CHLOROPHYLL D

ChemComp-PHO:
PHEOPHYTIN A

ChemComp-BCR:
BETA-CAROTENE

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

ChemComp-PL9:
2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE

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

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

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


ChemComp, No image

ChemComp-F6C:
Chlorophyll F

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-BCT:
BICARBONATE ION / pH buffer*YM

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-HEC:
HEME C

ChemComp-HOH:
WATER

Source
  • chroococcidiopsis thermalis pcc 7203 (bacteria)
  • calothrix sp. nies-3974 (bacteria)
KeywordsELECTRON TRANSPORT / Chlorophyll f / photosystem II / FaRLiP

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