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Cryo-EM structure of cryptophyte photosystem I

Electron Microscopy
2.66Å resolution
PDB entry 7y7b coloured by chain, front view.
PDB entry 7y7b coloured by chain, side view.
PDB entry 7y7b coloured by chain, top view.
Source organism: Chroomonas placoidea
Assembly composition:
hetero 29-mer (preferred)
Entry contents: 28 distinct polypeptide molecules

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Assemblies

Assembly 1 (preferred)
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Assembly Name: Photosystem I
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Multimeric state: hetero 29-mer
Accessible surface area: 180563.06 Å2
Buried surface area: 492392.02 Å2
Dissociation area: 1,317.19 Å2
Dissociation energy (ΔGdiss): 1.93 kcal/mol
Dissociation entropy (TΔSdiss): 11.32 kcal/mol
Symmetry number: 1
PDBe Complex ID: PDB-CPX-214561

Macromolecules

ACPI-1
Chain: 1
Length: 222 amino acids
Theoretical weight: 23.48 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-1 in PDB entry 7y7b, assembly 1, front view.
ACPI-1 in PDB entry 7y7b, assembly 1, side view.
ACPI-1 in PDB entry 7y7b, assembly 1, top view.
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ACPI-2
Chain: 2
Length: 216 amino acids
Theoretical weight: 23.4 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-2 in PDB entry 7y7b, assembly 1, front view.
ACPI-2 in PDB entry 7y7b, assembly 1, side view.
ACPI-2 in PDB entry 7y7b, assembly 1, top view.
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ACPI-3
Chain: 3
Length: 236 amino acids
Theoretical weight: 24.97 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-3 in PDB entry 7y7b, assembly 1, front view.
ACPI-3 in PDB entry 7y7b, assembly 1, side view.
ACPI-3 in PDB entry 7y7b, assembly 1, top view.
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ACPI-4
Chain: 4
Length: 217 amino acids
Theoretical weight: 23.55 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-4 in PDB entry 7y7b, assembly 1, front view.
ACPI-4 in PDB entry 7y7b, assembly 1, side view.
ACPI-4 in PDB entry 7y7b, assembly 1, top view.
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ACPI-5
Chain: 5
Length: 229 amino acids
Theoretical weight: 24.06 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-5 in PDB entry 7y7b, assembly 1, front view.
ACPI-5 in PDB entry 7y7b, assembly 1, side view.
ACPI-5 in PDB entry 7y7b, assembly 1, top view.
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ACPI-6
Chain: 6
Length: 215 amino acids
Theoretical weight: 22.69 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-6 in PDB entry 7y7b, assembly 1, front view.
ACPI-6 in PDB entry 7y7b, assembly 1, side view.
ACPI-6 in PDB entry 7y7b, assembly 1, top view.
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ACPI-7
Chain: 7
Length: 230 amino acids
Theoretical weight: 24.55 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-7 in PDB entry 7y7b, assembly 1, front view.
ACPI-7 in PDB entry 7y7b, assembly 1, side view.
ACPI-7 in PDB entry 7y7b, assembly 1, top view.
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ACPI-8
Chain: 8
Length: 227 amino acids
Theoretical weight: 23.7 KDa
Source organism: Chroomonas placoidea
InterPro: Chlorophyll A-B binding protein
ACPI-8 in PDB entry 7y7b, assembly 1, front view.
ACPI-8 in PDB entry 7y7b, assembly 1, side view.
ACPI-8 in PDB entry 7y7b, assembly 1, top view.
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ACPI-12
Chain: 9
Length: 220 amino acids
Theoretical weight: 23.22 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-12 in PDB entry 7y7b, assembly 1, front view.
ACPI-12 in PDB entry 7y7b, assembly 1, side view.
ACPI-12 in PDB entry 7y7b, assembly 1, top view.
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Photosystem I P700 chlorophyll a apoprotein A1
Chain: A
Length: 752 amino acids
Theoretical weight: 83.49 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AIB4 (Residues: 1-752; Coverage: 100%)
Gene name: psaA
Pfam: Photosystem I psaA/psaB protein
InterPro:
Photosystem I P700 chlorophyll a apoprotein A1 in PDB entry 7y7b, assembly 1, front view.
Photosystem I P700 chlorophyll a apoprotein A1 in PDB entry 7y7b, assembly 1, side view.
Photosystem I P700 chlorophyll a apoprotein A1 in PDB entry 7y7b, assembly 1, top view.
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Photosystem I P700 chlorophyll a apoprotein A2
Chain: B
Length: 734 amino acids
Theoretical weight: 82.22 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AI95 (Residues: 1-734; Coverage: 100%)
Gene name: psaB
Pfam: Photosystem I psaA/psaB protein
InterPro:
Photosystem I P700 chlorophyll a apoprotein A2 in PDB entry 7y7b, assembly 1, front view.
Photosystem I P700 chlorophyll a apoprotein A2 in PDB entry 7y7b, assembly 1, side view.
Photosystem I P700 chlorophyll a apoprotein A2 in PDB entry 7y7b, assembly 1, top view.
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Photosystem I iron-sulfur center
Chain: C
Length: 81 amino acids
Theoretical weight: 8.74 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AI25 (Residues: 1-81; Coverage: 100%)
Gene name: psaC
Pfam: 4Fe-4S dicluster domain
InterPro:
Photosystem I iron-sulfur center in PDB entry 7y7b, assembly 1, front view.
Photosystem I iron-sulfur center in PDB entry 7y7b, assembly 1, side view.
Photosystem I iron-sulfur center in PDB entry 7y7b, assembly 1, top view.
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Photosystem I reaction center subunit II
Chain: D
Length: 141 amino acids
Theoretical weight: 15.59 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AIA6 (Residues: 1-141; Coverage: 100%)
Gene name: psaD
Pfam: PsaD
InterPro:
Photosystem I reaction center subunit II in PDB entry 7y7b, assembly 1, front view.
Photosystem I reaction center subunit II in PDB entry 7y7b, assembly 1, side view.
Photosystem I reaction center subunit II in PDB entry 7y7b, assembly 1, top view.
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Photosystem I reaction center subunit IV
Chain: E
Length: 64 amino acids
Theoretical weight: 7.35 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AIF3 (Residues: 1-64; Coverage: 100%)
Gene name: psaE
Pfam: Photosystem I reaction centre subunit IV / PsaE
InterPro:
Photosystem I reaction center subunit IV in PDB entry 7y7b, assembly 1, front view.
Photosystem I reaction center subunit IV in PDB entry 7y7b, assembly 1, side view.
Photosystem I reaction center subunit IV in PDB entry 7y7b, assembly 1, top view.
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Photosystem I reaction center subunit III
Chain: F
Length: 183 amino acids
Theoretical weight: 20.39 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AI52 (Residues: 1-183; Coverage: 100%)
Gene name: psaF
Pfam: Photosystem I reaction centre subunit III
InterPro:
Photosystem I reaction center subunit III in PDB entry 7y7b, assembly 1, front view.
Photosystem I reaction center subunit III in PDB entry 7y7b, assembly 1, side view.
Photosystem I reaction center subunit III in PDB entry 7y7b, assembly 1, top view.
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Photosystem I reaction center subunit VIII
Chain: I
Length: 36 amino acids
Theoretical weight: 3.98 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AI78 (Residues: 1-36; Coverage: 100%)
Gene name: psaI
Pfam: Photosystem I reaction centre subunit VIII
InterPro:
Photosystem I reaction center subunit VIII in PDB entry 7y7b, assembly 1, front view.
Photosystem I reaction center subunit VIII in PDB entry 7y7b, assembly 1, side view.
Photosystem I reaction center subunit VIII in PDB entry 7y7b, assembly 1, top view.
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Photosystem I reaction center subunit IX
Chain: J
Length: 42 amino acids
Theoretical weight: 4.86 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AI55 (Residues: 1-42; Coverage: 100%)
Gene name: psaJ
Pfam: Photosystem I reaction centre subunit IX / PsaJ
InterPro:
Photosystem I reaction center subunit IX in PDB entry 7y7b, assembly 1, front view.
Photosystem I reaction center subunit IX in PDB entry 7y7b, assembly 1, side view.
Photosystem I reaction center subunit IX in PDB entry 7y7b, assembly 1, top view.
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Photosystem I reaction center subunit PsaK
Chain: K
Length: 87 amino acids
Theoretical weight: 8.84 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AI34 (Residues: 1-87; Coverage: 100%)
Gene name: psaK
Pfam: Photosystem I psaG / psaK
InterPro:
Photosystem I reaction center subunit PsaK in PDB entry 7y7b, assembly 1, front view.
Photosystem I reaction center subunit PsaK in PDB entry 7y7b, assembly 1, side view.
Photosystem I reaction center subunit PsaK in PDB entry 7y7b, assembly 1, top view.
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Photosystem I reaction center subunit XI
Chain: L
Length: 153 amino acids
Theoretical weight: 16.49 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AI68 (Residues: 1-153; Coverage: 100%)
Gene name: psaL
Pfam: Photosystem I reaction centre subunit XI
InterPro:
Photosystem I reaction center subunit XI in PDB entry 7y7b, assembly 1, front view.
Photosystem I reaction center subunit XI in PDB entry 7y7b, assembly 1, side view.
Photosystem I reaction center subunit XI in PDB entry 7y7b, assembly 1, top view.
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Photosystem I reaction center subunit XII
Chain: M
Length: 30 amino acids
Theoretical weight: 3.25 KDa
Source organism: Chroomonas placoidea
UniProt:
  • Canonical: A0A222AI28 (Residues: 1-30; Coverage: 100%)
Gene name: psaM
Pfam: Photosystem I protein M (PsaM)
InterPro:
Photosystem I reaction center subunit XII in PDB entry 7y7b, assembly 1, front view.
Photosystem I reaction center subunit XII in PDB entry 7y7b, assembly 1, side view.
Photosystem I reaction center subunit XII in PDB entry 7y7b, assembly 1, top view.
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PsaO
Chain: O
Length: 99 amino acids
Theoretical weight: 10.77 KDa
Source organism: Chroomonas placoidea
InterPro: Photosystem I PsaO
PsaO in PDB entry 7y7b, assembly 1, front view.
PsaO in PDB entry 7y7b, assembly 1, side view.
PsaO in PDB entry 7y7b, assembly 1, top view.
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PsaR
Chain: R
Length: 133 amino acids
Theoretical weight: 13.87 KDa
Source organism: Chroomonas placoidea
PsaR in PDB entry 7y7b, assembly 1, front view.
PsaR in PDB entry 7y7b, assembly 1, side view.
PsaR in PDB entry 7y7b, assembly 1, top view.
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Unk1
Chain: X
Length: 164 amino acids
Theoretical weight: 13.98 KDa
Source organism: Chroomonas placoidea
Unk1 in PDB entry 7y7b, assembly 1, front view.
Unk1 in PDB entry 7y7b, assembly 1, side view.
Unk1 in PDB entry 7y7b, assembly 1, top view.
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ACPI-S
Chain: Z
Length: 242 amino acids
Theoretical weight: 25.65 KDa
Source organism: Chroomonas placoidea
ACPI-S in PDB entry 7y7b, assembly 1, front view.
ACPI-S in PDB entry 7y7b, assembly 1, side view.
ACPI-S in PDB entry 7y7b, assembly 1, top view.
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ACPI-13/10
Chains: a, d
Length: 215 amino acids
Theoretical weight: 22.27 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-13/10 in PDB entry 7y7b, assembly 1, front view.
ACPI-13/10 in PDB entry 7y7b, assembly 1, side view.
ACPI-13/10 in PDB entry 7y7b, assembly 1, top view.
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ACPI-14
Chain: b
Length: 218 amino acids
Theoretical weight: 23.76 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-14 in PDB entry 7y7b, assembly 1, front view.
ACPI-14 in PDB entry 7y7b, assembly 1, side view.
ACPI-14 in PDB entry 7y7b, assembly 1, top view.
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ACPI-9
Chain: c
Length: 257 amino acids
Theoretical weight: 27.21 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-9 in PDB entry 7y7b, assembly 1, front view.
ACPI-9 in PDB entry 7y7b, assembly 1, side view.
ACPI-9 in PDB entry 7y7b, assembly 1, top view.
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ACPI-11
Chain: e
Length: 208 amino acids
Theoretical weight: 22.45 KDa
Source organism: Chroomonas placoidea
InterPro:
ACPI-11 in PDB entry 7y7b, assembly 1, front view.
ACPI-11 in PDB entry 7y7b, assembly 1, side view.
ACPI-11 in PDB entry 7y7b, assembly 1, top view.
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