- EMDB-65026: PSI-LHCI of Euglena gracilis strain Z -
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Basic information
Entry
Database: EMDB / ID: EMD-65026
Title
PSI-LHCI of Euglena gracilis strain Z
Map data
Sample
Complex: PSI-LHCI
Protein or peptide: x 19 types
Ligand: x 10 types
Keywords
Photosystem I / ELECTRON TRANSPORT / PHOTOSYNTHESIS
Function / homology
Function and homology information
photosynthesis, light harvesting / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / chlorophyll binding / chloroplast thylakoid membrane / photosynthesis / chloroplast / 4 iron, 4 sulfur cluster binding / electron transfer activity ...photosynthesis, light harvesting / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / chlorophyll binding / chloroplast thylakoid membrane / photosynthesis / chloroplast / 4 iron, 4 sulfur cluster binding / electron transfer activity / oxidoreductase activity / magnesium ion binding / metal ion binding / membrane Similarity search - Function
Photosystem I PsaM, reaction centre superfamily / Photosystem I PsaM, reaction centre / Photosystem I protein M (PsaM) / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I reaction centre subunit IX / PsaJ / Chlorophyll A-B binding protein, plant and chromista / Chlorophyll A-B binding protein / Chlorophyll A-B binding protein / Photosystem I protein PsaC ...Photosystem I PsaM, reaction centre superfamily / Photosystem I PsaM, reaction centre / Photosystem I protein M (PsaM) / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I reaction centre subunit IX / PsaJ / Chlorophyll A-B binding protein, plant and chromista / Chlorophyll A-B binding protein / Chlorophyll A-B binding protein / Photosystem I protein PsaC / Photosystem I PsaB / Photosystem I PsaA/PsaB, conserved site / Photosystem I psaA and psaB proteins signature. / : / Photosystem I PsaA/PsaB / Photosystem I PsaA/PsaB superfamily / Photosystem I psaA/psaB protein / 4Fe-4S dicluster domain / 4Fe-4S ferredoxin, iron-sulphur binding, conserved site / 4Fe-4S ferredoxin-type iron-sulfur binding region signature. / 4Fe-4S ferredoxin-type iron-sulfur binding domain profile. / 4Fe-4S ferredoxin-type, iron-sulphur binding domain Similarity search - Domain/homology
Chloroplast light-harvesting complex I protein / Photosystem I P700 chlorophyll a apoprotein A2 / Photosystem I reaction center subunit IX / Photosystem I reaction center subunit XII / Photosystem I iron-sulfur center Similarity search - Component
Biological species
Euglena gracilis (euglena)
Method
single particle reconstruction / cryo EM / Resolution: 2.83 Å
Journal: Sci Adv / Year: 2025 Title: Structural insights into the divergent evolution of a photosystem I supercomplex in . Authors: Koji Kato / Yoshiki Nakajima / Runa Sakamoto / Minoru Kumazawa / Kentaro Ifuku / Takahiro Ishikawa / Jian-Ren Shen / Atsushi Takabayashi / Ryo Nagao / Abstract: Photosystem I (PSI) forms supercomplexes with light-harvesting complexes (LHCs) to perform oxygenic photosynthesis. Here, we report a 2.82-angstrom cryo-electron microscopy structure of the PSI-LHCI ...Photosystem I (PSI) forms supercomplexes with light-harvesting complexes (LHCs) to perform oxygenic photosynthesis. Here, we report a 2.82-angstrom cryo-electron microscopy structure of the PSI-LHCI supercomplex from , a eukaryotic alga with secondary green alga-derived plastids. The structure reveals a PSI monomer core with eight subunits and 13 asymmetrically arranged LHCI proteins. LHCIs bind diadinoxanthin, which is one of the carotenoids typically associated with red-lineage LHCs and is not present in the canonical LHCI belt found in green-lineage PSI-LHCI structures. Phylogenetic analysis shows that the LHCIs originated from LHCII-related clades rather than from the green-lineage LHCI group and that the nuclear-encoded PSI subunit PsaD likely originated from cyanobacteria via horizontal gene transfer. These observations indicate a mosaic origin of the PSI-LHCI. Our findings uncover a noncanonical light-harvesting architecture and highlight the structural and evolutionary plasticity of photosynthetic systems, illustrating how endosymbiotic acquisition and lineage-specific adaptation shape divergent light-harvesting strategies.
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