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Structure paper

TitleArchitecture of symbiotic dinoflagellate photosystem I-light-harvesting supercomplex in Symbiodinium.
Journal, issue, pagesNat Commun, Vol. 15, Issue 1, Page 2392, Year 2024
Publish dateMar 16, 2024
AuthorsLong-Sheng Zhao / Ning Wang / Kang Li / Chun-Yang Li / Jian-Ping Guo / Fei-Yu He / Gui-Ming Liu / Xiu-Lan Chen / Jun Gao / Lu-Ning Liu / Yu-Zhong Zhang /
PubMed AbstractSymbiodinium are the photosynthetic endosymbionts for corals and play a vital role in supplying their coral hosts with photosynthetic products, forming the nutritional foundation for high-yield coral ...Symbiodinium are the photosynthetic endosymbionts for corals and play a vital role in supplying their coral hosts with photosynthetic products, forming the nutritional foundation for high-yield coral reef ecosystems. Here, we determine the cryo-electron microscopy structure of Symbiodinium photosystem I (PSI) supercomplex with a PSI core composed of 13 subunits including 2 previously unidentified subunits, PsaT and PsaU, as well as 13 peridinin-Chl a/c-binding light-harvesting antenna proteins (AcpPCIs). The PSI-AcpPCI supercomplex exhibits distinctive structural features compared to their red lineage counterparts, including extended termini of PsaD/E/I/J/L/M/R and AcpPCI-1/3/5/7/8/11 subunits, conformational changes in the surface loops of PsaA and PsaB subunits, facilitating the association between the PSI core and peripheral antennae. Structural analysis and computational calculation of excitation energy transfer rates unravel specific pigment networks in Symbiodinium PSI-AcpPCI for efficient excitation energy transfer. Overall, this study provides a structural basis for deciphering the mechanisms governing light harvesting and energy transfer in Symbiodinium PSI-AcpPCI supercomplexes adapted to their symbiotic ecosystem, as well as insights into the evolutionary diversity of PSI-LHCI among various photosynthetic organisms.
External linksNat Commun / PubMed:38493166 / PubMed Central
MethodsEM (single particle)
Resolution2.8 Å
Structure data

36366

8jjr

EMDB-36366, PDB-8jjr:
Cryo-EM structure of Symbiodinium photosystem I
Method: EM (single particle) / Resolution: 2.8 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-KC2:
Chlorophyll c2 / Chlorophyll c


ChemComp, No image

ChemComp-UIX:
Unknown entry

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

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

ChemComp-PID:
PERIDININ / Peridinin

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

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

ChemComp-SF4:
IRON/SULFUR CLUSTER / Iron–sulfur cluster

Source
  • symbiodinium sp. (eukaryote)
KeywordsPHOTOSYNTHESIS / Symbiodinium / Photosystem I

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