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TitleStructure of a photosystem II-FCPII supercomplex from a haptophyte reveals a distinct antenna organization.
Journal, issue, pagesNat Commun, Vol. 16, Issue 1, Page 4175, Year 2025
Publish dateMay 5, 2025
AuthorsRomain La Rocca / Koji Kato / Pi-Cheng Tsai / Yoshiki Nakajima / Fusamichi Akita / Jian-Ren Shen /
PubMed AbstractHaptophytes are unicellular algae that produce 30 to 50% of biomass in oceans. Among haptophytes, a subset named coccolithophores is characterized by calcified scales. Despite the importance of ...Haptophytes are unicellular algae that produce 30 to 50% of biomass in oceans. Among haptophytes, a subset named coccolithophores is characterized by calcified scales. Despite the importance of coccolithophores in global carbon fixation and CaCO production, their energy conversion system is still poorly known. Here we report a cryo-electron microscopic structure of photosystem II (PSII)-fucoxanthin chlorophyll c-binding protein (FCPII) supercomplex from Chyrostila roscoffensis, a representative of coccolithophores. This complex has two sets of six dimeric and monomeric FCPIIs, with distinct orientations. Interfaces of both FCPII/FCPII and FCPII/core differ from previously reported. We also determine the sequence of Psb36, a subunit previously found in diatoms and red algae. The principal excitation energy transfer (EET) pathways involve mainly 5 FCPIIs, where one FCPII monomer mediates EET to CP47. Our findings provide a solid structural basis for EET and energy dissipation pathways occurring in coccolithophores.
External linksNat Commun / PubMed:40325014 / PubMed Central
MethodsEM (single particle)
Resolution2.22 - 2.88 Å
Structure data

62499

9kqb

EMDB-62499, PDB-9kqb:
PSII-FCPII supercomplex from haptophyte Chrysotila roscoffensis
Method: EM (single particle) / Resolution: 2.22 Å

EMDB-62790: PSII-6 FCPII supercomplex from haptophyte Chrysotila roscoffensis
Method: EM (single particle) / Resolution: 2.88 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-DD6:
(3S,3'R,5R,6S,7cis)-7',8'-didehydro-5,6-dihydro-5,6-epoxy-beta,beta-carotene-3,3'-diol

ChemComp-A86:
(3S,3'S,5R,5'R,6S,6'R,8'R)-3,5'-dihydroxy-8-oxo-6',7'-didehydro-5,5',6,6',7,8-hexahydro-5,6-epoxy-beta,beta-caroten-3'-

ChemComp-KC1:
Chlorophyll c1

ChemComp-BCR:
BETA-CAROTENE

ChemComp-PHO:
PHEOPHYTIN A

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

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

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-BCT:
BICARBONATE ION / pH buffer*YM

ChemComp-FE2:
Unknown entry

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-HOH:
WATER

Source
  • chrysotila roscoffensis (eukaryote)
KeywordsPHOTOSYNTHESIS / photosystem II / chlorophyll / light-harvesting complex / energy transfer / LHCII / FCPII / coccolithophore / haptophyte

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