- EMDB-37513: Cryo-EM structure of the red-shifted Fittonia albivenis PSI-LHCI -
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Basic information
Entry
Database: EMDB / ID: EMD-37513
Title
Cryo-EM structure of the red-shifted Fittonia albivenis PSI-LHCI
Map data
Sample
Complex: Photosystem I complex
Protein or peptide: x 18 types
Ligand: x 12 types
Keywords
Complex / PHOTOSYNTHESIS
Function / homology
Function and homology information
chloroplast thylakoid / plastoglobule / photosystem I reaction center / photosystem I / thylakoid / chloroplast envelope / photosystem I / chlorophyll binding / photosynthetic electron transport in photosystem I / chloroplast thylakoid membrane ...chloroplast thylakoid / plastoglobule / photosystem I reaction center / photosystem I / thylakoid / chloroplast envelope / photosystem I / chlorophyll binding / photosynthetic electron transport in photosystem I / chloroplast thylakoid membrane / photosynthesis / chloroplast / 4 iron, 4 sulfur cluster binding / oxidoreductase activity / electron transfer activity / protein domain specific binding / mRNA binding / magnesium ion binding / nucleus / metal ion binding Similarity search - Function
4Fe-4S dicluster domain / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII superfamily / Photosystem I PsaF, reaction centre subunit III / Photosystem I PsaF, reaction centre subunit III superfamily / Photosystem I reaction centre subunit III / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I reaction centre subunit IX / PsaJ ...4Fe-4S dicluster domain / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII superfamily / Photosystem I PsaF, reaction centre subunit III / Photosystem I PsaF, reaction centre subunit III superfamily / Photosystem I reaction centre subunit III / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I reaction centre subunit IX / PsaJ / Photosystem I protein PsaC / Photosystem I PsaA / 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 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
Photosystem I P700 chlorophyll a apoprotein A1 / Photosystem I reaction center subunit VIII / Photosystem I iron-sulfur center / Photosystem I P700 chlorophyll a apoprotein A2 / Photosystem I reaction center subunit IX / Photosystem I reaction center subunit III, chloroplastic Similarity search - Component
Biological species
Fittonia albivenis (plant)
Method
single particle reconstruction / cryo EM / Resolution: 2.4 Å
Journal: Nat Commun / Year: 2024 Title: Structure of the red-shifted Fittonia albivenis photosystem I. Authors: Xiuxiu Li / Guoqiang Huang / Lixia Zhu / Chenyang Hao / Sen-Fang Sui / Xiaochun Qin / Abstract: Photosystem I (PSI) from Fittonia albivenis, an Acanthaceae ornamental plant, is notable among green plants for its red-shifted emission spectrum. Here, we solved the structure of a PSI-light ...Photosystem I (PSI) from Fittonia albivenis, an Acanthaceae ornamental plant, is notable among green plants for its red-shifted emission spectrum. Here, we solved the structure of a PSI-light harvesting complex I (LHCI) supercomplex from F. albivenis at 2.46-Å resolution using cryo-electron microscopy. The supercomplex contains a core complex of 14 subunits and an LHCI belt with four antenna subunits (Lhca1-4) similar to previously reported angiosperm PSI-LHCI structures; however, Lhca3 differs in three regions surrounding a dimer of low-energy chlorophylls (Chls) termed red Chls, which absorb far-red beyond visible light. The unique amino acid sequences within these regions are exclusively shared by plants with strongly red-shifted fluorescence emission, suggesting candidate structural elements for regulating the energy state of red Chls. These results provide a structural basis for unraveling the mechanisms of light harvest and transfer in PSI-LHCI of under canopy plants and for designing Lhc to harness longer-wavelength light in the far-red spectral range.
MAASVAAQSP VAVFRPRFLT GAPGKLNRPS VTVKQAVSSR GSFKVEAEKG EWLPGLPSPA YLDGSLPGDN GFDPLGLAED PENLKWYIQ AELVNSRWAM LGVAGMLLPE VFTYLGIINV PKWYDAGKSE YFASSSTLFV IEFILFHYVE IRRWQDIKNP G CVNQDPIF KNYSLPPHEC GYPGSVFNPL NFEPTLEAKE KELANGRLAM LAFLGFIVQH NVTGKGPFDN LVQHVADPWH NT IINTIRG Y
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Macromolecule #5: Photosystem I P700 chlorophyll a apoprotein A1
Macromolecule
Name: Photosystem I P700 chlorophyll a apoprotein A1 / type: protein_or_peptide / ID: 5 Details: Sequence reference for Fittonia albivenis is not available in UniProt at the time of biocuration. Current sequence reference is from UniProt id A0A8A0WPY6. Number of copies: 1 / Enantiomer: LEVO / EC number: photosystem I
UniProtKB: Photosystem I P700 chlorophyll a apoprotein A1
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Macromolecule #6: Photosystem I P700 chlorophyll a apoprotein A2
Macromolecule
Name: Photosystem I P700 chlorophyll a apoprotein A2 / type: protein_or_peptide / ID: 6 Details: Sequence reference for Fittonia albivenis is not available in UniProt at the time of biocuration. Current sequence reference is from UniProt id G9IB61. Number of copies: 1 / Enantiomer: LEVO / EC number: photosystem I
UniProtKB: Photosystem I P700 chlorophyll a apoprotein A2
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Macromolecule #7: Photosystem I iron-sulfur center
Macromolecule
Name: Photosystem I iron-sulfur center / type: protein_or_peptide / ID: 7 Details: Sequence reference for Fittonia albivenis is not available in UniProt at the time of biocuration. Current sequence reference is from UniProt id A4QJG7. Number of copies: 1 / Enantiomer: LEVO / EC number: photosystem I
Source (natural)
Organism: Fittonia albivenis (plant)
Molecular weight
Theoretical: 9.049509 KDa
Sequence
String:
MSHSVKIYDT CIGCTQCVRA CPTDVLEMIP WDGCKAKQIA SAPRTEDCVG CKRCESACPT DFLSVRVYLW HETTRSMGLA Y
UniProtKB: Photosystem I iron-sulfur center
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Macromolecule #8: Photosystem I reaction center subunit II
Macromolecule
Name: Photosystem I reaction center subunit II / type: protein_or_peptide / ID: 8 / Number of copies: 1 / Enantiomer: LEVO
Macromolecule #10: Photosystem I reaction center subunit III, chloroplastic
Macromolecule
Name: Photosystem I reaction center subunit III, chloroplastic type: protein_or_peptide / ID: 10 Details: Sequence reference for Fittonia albivenis is not available in UniProt at the time of biocuration. Current sequence reference is from UniProt id Q9SHE8. Number of copies: 1 / Enantiomer: LEVO
Macromolecule #13: Photosystem I reaction center subunit VIII
Macromolecule
Name: Photosystem I reaction center subunit VIII / type: protein_or_peptide / ID: 13 Details: Sequence reference for Fittonia albivenis is not available in UniProt at the time of biocuration. Current sequence reference is from UniProt id A0A8A9WIB9. Number of copies: 1 / Enantiomer: LEVO
Source (natural)
Organism: Fittonia albivenis (plant)
Molecular weight
Theoretical: 3.930826 KDa
Sequence
String:
MTAFNLPSIF VPLVGLVFPA IAMASLFLHV QKNKIV
UniProtKB: Photosystem I reaction center subunit VIII
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Macromolecule #14: Photosystem I reaction center subunit IX
Macromolecule
Name: Photosystem I reaction center subunit IX / type: protein_or_peptide / ID: 14 Details: Sequence reference for Fittonia albivenis is not available in UniProt at the time of biocuration. Current sequence reference is from UniProt id Q3C1K9. Number of copies: 1 / Enantiomer: LEVO
Source (natural)
Organism: Fittonia albivenis (plant)
Molecular weight
Theoretical: 5.029914 KDa
Sequence
String:
MRDLKTYLSV APVLSTLWFG ALAGLLIEIN RFFPDALTFP FFSF
UniProtKB: Photosystem I reaction center subunit IX
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Macromolecule #15: Photosystem I reaction center subunit psaK
Macromolecule
Name: Photosystem I reaction center subunit psaK / type: protein_or_peptide / ID: 15 / Number of copies: 1 / Enantiomer: LEVO
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