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Structure paper

TitleCryo-EM structural analyses of chlorophyll b-enriched PSI-LHC and PSII-LHC supercomplexes of the siphonous green alga Bryopsis corticulans.
Journal, issue, pagesPlant Commun, Vol. 7, Issue 5, Page 101738, Year 2026
Publish dateMay 11, 2026
AuthorsXueyang Liu / Zhenhua Li / Liangliang Shen / Lili Shen / Bin Wu / Xiaoyi Li / Yanyan Yang / Shan Gao / Guangye Han / Tingyun Kuang / Cheng Liu / Jian-Ren Shen / Wenda Wang /
PubMed AbstractThe light-harvesting complexes of photosystem I (PSI) and PSII (LHCI and LHCII) in Bryopsis corticulans (B. corticulans) are homologous to those in Chlamydomonas reinhardtii and land plants but ...The light-harvesting complexes of photosystem I (PSI) and PSII (LHCI and LHCII) in Bryopsis corticulans (B. corticulans) are homologous to those in Chlamydomonas reinhardtii and land plants but exhibit a distinct chlorophyll (Chl) and carotenoid composition. Here, we report cryo-electron microscopy structures of the PSI-LHCI-LHCII supercomplex, comprising three LHCII trimers, and the CSMN-type PSII-LHCII supercomplex from B. corticulans. In the PSI supercomplex, ten LHCI subunits assemble into two belts and one heterodimer, coordinating a total of 86 Chl a and 65 Chl b molecules (Chl a/b ratio of 1.3, compared with 3.4 in C. reinhardtii), as well as 18 siphonaxanthin, 2 siphonein, and 13 α-carotene molecules. Of the three LHCII trimers bound to the PSI-LHCI supercomplex, two are anchored to the PSI core primarily via phosphorylated subunits, whereas the third, non-phosphorylated trimer is stabilized through interactions with Lhca-d and the adjacent LHCII trimer. In the CSMN-type PSII-LHCII supercomplex, the N-LHCII is positioned closer to the PSII core than in C. reinhardtii, likely owing to loss of the linker motif in the N-terminal region of B. corticulans CP29. Structure-based energy transfer analysis suggests that this spatial rearrangement enhances the efficiency of excitation energy transfer from N-LHCII to the PSII core. Collectively, these findings reveal structural adaptations that underlie the acclimation strategies of siphonous green algae inhabiting intertidal environments.
External linksPlant Commun / PubMed:41578646 / PubMed Central
MethodsEM (single particle)
Resolution2.68 - 3.07 Å
Structure data

61940

9jzr

EMDB-61940, PDB-9jzr:
Structure of PSI-LHCI-LHCII supercomplex from Bryopsis corticulans
Method: EM (single particle) / Resolution: 2.73 Å

61973

9k1e

EMDB-61973, PDB-9k1e:
Structural insights into photosystem I complex of Bryopsis corticulans
Method: EM (single particle) / Resolution: 2.68 Å

62153

9k7v

EMDB-62153, PDB-9k7v:
Structural insights into photosystem II supercomplex of a a siphonous green algae Bryopsis corticulans from intertidal zone
Method: EM (single particle) / Resolution: 3.07 Å

Chemicals

ChemComp-CHL:
CHLOROPHYLL B

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-8CT:
(6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta,beta-carotene

ChemComp-0UR:
Siphonein

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

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

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

ChemComp-0IE:
Siphonaxanthin

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-NEX:
(1R,3R)-6-{(3E,5E,7E,9E,11E,13E,15E,17E)-18-[(1S,4R,6R)-4-HYDROXY-2,2,6-TRIMETHYL-7-OXABICYCLO[4.1.0]HEPT-1-YL]-3,7,12,16-TETRAMETHYLOCTADECA-1,3,5,7,9,11,13,15,17-NONAENYLIDENE}-1,5,5-TRIMETHYLCYCLOHEXANE-1,3-DIOL

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-XAT:
(3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL

ChemComp-OEX:
CA-MN4-O5 CLUSTER

ChemComp-PHO:
PHEOPHYTIN A

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

Source
  • bryopsis corticulans (plant)
KeywordsPHOTOSYNTHESIS / photosystem II / PSI-LHCI supercomplex / PSII-LHCII supercomplex

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