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Structure paper

TitleStructural basis of diadinoxanthin-Chl a/b-binding proteins in the photosystem I supercomplex of .
Journal, issue, pagesSci Adv, Vol. 12, Issue 10, Page eaea5561, Year 2026
Publish dateMar 6, 2026
AuthorsTianyu Bai / Zhiyuan Mao / Dapeng Sun / Yang Tang / Ziqiu Lu / Fei Ma / Bingxin Ma / Jinghua Chen / Weiwei Wang / Yuelin Li / Shufang Liu / Yi Yang / Yumei Wang / Lirong Tian /
PubMed Abstract is a phototrophic flagellate that has evolved through secondary endosymbiotic events and belongs to green-lineage organisms. We report a unique structure of photosystem I-light harvesting complex I ... is a phototrophic flagellate that has evolved through secondary endosymbiotic events and belongs to green-lineage organisms. We report a unique structure of photosystem I-light harvesting complex I (PSI-LHCI) supercomplex from at a 2.23-angstrom resolution by cryo-electron microscopy. The supercomplex is composed of 8 core subunits and 16 LHCIs and exhibits distinctive structural features compared to its counterparts in green algae and plants. The LHCI subunits encircle the core complex, forming a two-layered arrangement that comprises six pairs of tightly packed heterodimers. Specifically, the 16 LHCIs consist of 4 diadinoxanthin-chlorophyll (Chl) a/b-binding antennae (Lhcbm) and 12 diadinoxanthin-Chl a-binding antennae (Lhca), and they exhibit characteristic pigment compositions combining features of green- and red-lineage organisms. These findings provide a robust structural foundation for elucidating the mechanisms of light harvesting and energy transfer as well as insights into the evolutionary changes of green-lineage PSI-LHCI.
External linksSci Adv / PubMed:41790873 / PubMed Central
MethodsEM (single particle)
Resolution2.23 - 2.63 Å
Structure data

64823

9v7t

EMDB-64823: PSI-LHCE supercomplex from Euglena gracilis
PDB-9v7t: PSI-LHCE supercomplex from Euglena gracilis.
Method: EM (single particle) / Resolution: 2.23 Å

64824

9v7u

EMDB-64824, PDB-9v7u:
PSI-LHCE supercomplex from Euglena gracilis.
Method: EM (single particle) / Resolution: 2.63 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A

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

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

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-BCR:
BETA-CAROTENE

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

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

ChemComp-SF4:
IRON/SULFUR CLUSTER

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-CHL:
CHLOROPHYLL B

Source
  • euglena gracilis (euglena)
KeywordsPHOTOSYNTHESIS / PSI / Euglena gracilis. / PSI-eLHCI

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