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Cryo-EM structure of the tetrameric photosystem I from a heterocyst-forming cyanobacterium Anabaena sp. PCC7120

Electron Microscopy
2.37Å resolution
PDB entry 6k61 coloured by chain, front view.
PDB entry 6k61 coloured by chain, side view.
PDB entry 6k61 coloured by chain, top view.
Source organism: Nostoc sp. PCC 7120 = FACHB-418
Assembly composition:
hetero 24-mer (preferred)
Entry contents: 12 distinct polypeptide molecules

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Assemblies

Assembly 1 (preferred)
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Multimeric state: hetero 24-mer
Accessible surface area: 124015.44 Å2
Buried surface area: 418189.72 Å2
Dissociation area: 2,602.99 Å2
Dissociation energy (ΔGdiss): 2.63 kcal/mol
Dissociation entropy (TΔSdiss): 22.59 kcal/mol
Symmetry number: 1
PDBe Complex ID: PDB-CPX-141244

Macromolecules

Photosystem I P700 chlorophyll a apoprotein A1
Chains: A, a
Length: 752 amino acids
Theoretical weight: 83.29 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58576 (Residues: 1-752; Coverage: 100%)
Gene names: alr5154, psaA
Pfam: Photosystem I psaA/psaB protein
InterPro:
Photosystem I P700 chlorophyll a apoprotein A1 in PDB entry 6k61, assembly 1, front view.
Photosystem I P700 chlorophyll a apoprotein A1 in PDB entry 6k61, assembly 1, side view.
Photosystem I P700 chlorophyll a apoprotein A1 in PDB entry 6k61, assembly 1, top view.
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Photosystem I 4.8 kDa protein
Chains: X, x
Length: 44 amino acids
Theoretical weight: 4.87 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58566 (Residues: 1-44; Coverage: 100%)
Gene names: asr1283, psaX
Pfam: PsaX family
InterPro:
Photosystem I 4.8 kDa protein in PDB entry 6k61, assembly 1, front view.
Photosystem I 4.8 kDa protein in PDB entry 6k61, assembly 1, side view.
Photosystem I 4.8 kDa protein in PDB entry 6k61, assembly 1, top view.
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Photosystem I P700 chlorophyll a apoprotein A2 1
Chains: B, b
Length: 741 amino acids
Theoretical weight: 83.46 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58565 (Residues: 1-741; Coverage: 100%)
Gene names: alr5155, psaB1
Pfam: Photosystem I psaA/psaB protein
InterPro:
Photosystem I P700 chlorophyll a apoprotein A2 1 in PDB entry 6k61, assembly 1, front view.
Photosystem I P700 chlorophyll a apoprotein A2 1 in PDB entry 6k61, assembly 1, side view.
Photosystem I P700 chlorophyll a apoprotein A2 1 in PDB entry 6k61, assembly 1, top view.
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Photosystem I iron-sulfur center
Chains: C, c
Length: 81 amino acids
Theoretical weight: 8.83 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P0A410 (Residues: 1-81; Coverage: 100%)
Gene names: asr3463, psaC
Pfam: 4Fe-4S dicluster domain
InterPro:
Photosystem I iron-sulfur center in PDB entry 6k61, assembly 1, front view.
Photosystem I iron-sulfur center in PDB entry 6k61, assembly 1, side view.
Photosystem I iron-sulfur center in PDB entry 6k61, assembly 1, top view.
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Photosystem I reaction center subunit II
Chains: D, d
Length: 139 amino acids
Theoretical weight: 15.18 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58573 (Residues: 1-139; Coverage: 100%)
Gene names: all0329, psaD
Pfam: PsaD
InterPro:
Photosystem I reaction center subunit II in PDB entry 6k61, assembly 1, front view.
Photosystem I reaction center subunit II in PDB entry 6k61, assembly 1, side view.
Photosystem I reaction center subunit II in PDB entry 6k61, assembly 1, top view.
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Photosystem I reaction center subunit IV
Chains: E, e
Length: 70 amino acids
Theoretical weight: 7.9 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58575 (Residues: 1-70; Coverage: 100%)
Gene names: asr4319, psaE
Pfam: Photosystem I reaction centre subunit IV / PsaE
InterPro:
Photosystem I reaction center subunit IV in PDB entry 6k61, assembly 1, front view.
Photosystem I reaction center subunit IV in PDB entry 6k61, assembly 1, side view.
Photosystem I reaction center subunit IV in PDB entry 6k61, assembly 1, top view.
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Photosystem I reaction center subunit III
Chains: F, f
Length: 164 amino acids
Theoretical weight: 17.85 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58564 (Residues: 1-164; Coverage: 100%)
Gene names: all0109, psaF
Pfam: Photosystem I reaction centre subunit III
InterPro:
Photosystem I reaction center subunit III in PDB entry 6k61, assembly 1, front view.
Photosystem I reaction center subunit III in PDB entry 6k61, assembly 1, side view.
Photosystem I reaction center subunit III in PDB entry 6k61, assembly 1, top view.
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Photosystem I reaction center subunit IX
Chains: J, j
Length: 49 amino acids
Theoretical weight: 5.5 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58568 (Residues: 1-49; Coverage: 100%)
Gene names: asl0108, psaJ
Pfam: Photosystem I reaction centre subunit IX / PsaJ
InterPro:
Photosystem I reaction center subunit IX in PDB entry 6k61, assembly 1, front view.
Photosystem I reaction center subunit IX in PDB entry 6k61, assembly 1, side view.
Photosystem I reaction center subunit IX in PDB entry 6k61, assembly 1, top view.
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Photosystem I reaction center subunit PsaK 1
Chains: K, k
Length: 86 amino acids
Theoretical weight: 8.85 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58583 (Residues: 1-86; Coverage: 100%)
Gene names: asr4775, psaK1
Pfam: Photosystem I psaG / psaK
InterPro:
Photosystem I reaction center subunit PsaK 1 in PDB entry 6k61, assembly 1, front view.
Photosystem I reaction center subunit PsaK 1 in PDB entry 6k61, assembly 1, side view.
Photosystem I reaction center subunit PsaK 1 in PDB entry 6k61, assembly 1, top view.
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Photosystem I reaction center subunit VIII
Chains: I, i
Length: 46 amino acids
Theoretical weight: 5.07 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58560 (Residues: 1-46; Coverage: 100%)
Gene names: asl3849, psaI
Pfam: Photosystem I reaction centre subunit VIII
InterPro:
Photosystem I reaction center subunit VIII in PDB entry 6k61, assembly 1, front view.
Photosystem I reaction center subunit VIII in PDB entry 6k61, assembly 1, side view.
Photosystem I reaction center subunit VIII in PDB entry 6k61, assembly 1, top view.
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Photosystem I reaction center subunit XI
Chains: L, l
Length: 172 amino acids
Theoretical weight: 18.13 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: P58577 (Residues: 1-172; Coverage: 100%)
Gene names: all0107, psaL
Pfam: Photosystem I reaction centre subunit XI
InterPro:
Photosystem I reaction center subunit XI in PDB entry 6k61, assembly 1, front view.
Photosystem I reaction center subunit XI in PDB entry 6k61, assembly 1, side view.
Photosystem I reaction center subunit XI in PDB entry 6k61, assembly 1, top view.
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Photosystem I reaction center subunit XII
Chains: M, m
Length: 32 amino acids
Theoretical weight: 3.54 KDa
Source organism: Nostoc sp. PCC 7120 = FACHB-418
UniProt:
  • Canonical: Q8YNB0 (Residues: 1-32; Coverage: 100%)
Gene names: asr4657, psaM
Pfam: Photosystem I protein M (PsaM)
InterPro:
Photosystem I reaction center subunit XII in PDB entry 6k61, assembly 1, front view.
Photosystem I reaction center subunit XII in PDB entry 6k61, assembly 1, side view.
Photosystem I reaction center subunit XII in PDB entry 6k61, assembly 1, top view.
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