- EMDB-4883: Structure of a minimal photosystem I from a green alga -
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Basic information
Entry
Database: EMDB / ID: EMD-4883
Title
Structure of a minimal photosystem I from a green alga
Map data
Sample
Complex: Photosystem I
Protein or peptide: x 11 types
Ligand: x 11 types
Function / homology
Function and homology information
plastoglobule / photosynthesis, light harvesting in photosystem I / photosystem I / photosystem I / photosystem II / chlorophyll binding / photosynthetic electron transport in photosystem I / chloroplast thylakoid membrane / response to light stimulus / photosynthesis ...plastoglobule / photosynthesis, light harvesting in photosystem I / photosystem I / photosystem I / photosystem II / chlorophyll binding / photosynthetic electron transport in photosystem I / chloroplast thylakoid membrane / response to light stimulus / photosynthesis / 4 iron, 4 sulfur cluster binding / oxidoreductase activity / electron transfer activity / magnesium ion binding / metal ion binding Similarity search - Function
: / Chlorophyll A-B binding protein, plant and chromista / Photosystem I PsaJ, reaction centre subunit IX / Chlorophyll A-B binding protein / Photosystem I PsaJ, reaction centre subunit IX superfamily / Chlorophyll A-B binding protein / Photosystem I reaction centre subunit IX / PsaJ / Photosystem I protein PsaC / Photosystem I PsaA / Photosystem I PsaB ...: / Chlorophyll A-B binding protein, plant and chromista / Photosystem I PsaJ, reaction centre subunit IX / Chlorophyll A-B binding protein / Photosystem I PsaJ, reaction centre subunit IX superfamily / Chlorophyll A-B binding protein / 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 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
Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I P700 chlorophyll a apoprotein A1 / Photosystem I reaction center subunit IX / Photosystem I iron-sulfur center / Photosystem I P700 chlorophyll a apoprotein A2 Similarity search - Component
Biological species
Dunaliella salina (plant) / Green alga (plant)
Method
single particle reconstruction / cryo EM / Resolution: 3.2 Å
Journal: Nat Plants / Year: 2020 Title: Structure of a minimal photosystem I from the green alga Dunaliella salina. Authors: Annemarie Perez-Boerema / Daniel Klaiman / Ido Caspy / Sigal Y Netzer-El / Alexey Amunts / Nathan Nelson / Abstract: Solar energy harnessed by oxygenic photosynthesis supports most of the life forms on Earth. In eukaryotes, photosynthesis occurs in chloroplasts and is achieved by membrane-embedded macromolecular ...Solar energy harnessed by oxygenic photosynthesis supports most of the life forms on Earth. In eukaryotes, photosynthesis occurs in chloroplasts and is achieved by membrane-embedded macromolecular complexes that contain core and peripheral antennae with multiple pigments. The structure of photosystem I (PSI) comprises the core and light-harvesting (LHCI) complexes, which together form PSI-LHCI. Here we determined the structure of PSI-LHCI from the salt-tolerant green alga Dunaliella salina using X-ray crystallography and electron cryo-microscopy. Our results reveal a previously undescribed configuration of the PSI core. It is composed of only 7 subunits, compared with 14-16 subunits in plants and the alga Chlamydomonas reinhardtii, and forms the smallest known PSI. The LHCI is poorly conserved at the sequence level and binds to pigments that form new energy pathways, and the interactions between the individual Lhca1-4 proteins are weakened. Overall, the data indicate the PSI of D. salina represents a different type of the molecular organization that provides important information for reconstructing the plasticity and evolution of PSI.
History
Deposition
Apr 23, 2019
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Header (metadata) release
Jun 12, 2019
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Map release
Feb 19, 2020
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Update
Dec 2, 2020
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Current status
Dec 2, 2020
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
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