2PPS: Photosystem I
Photosynthetic reaction center and core antenna system (trimeric), alpha carbon only. Determined by X-ray diffraction at 4.0 Å resolution. Released 27 May 1998.
- Method
- X-ray diffraction
- Resolution
- 4.0 Å
- Organism
- Synechococcus elongatus
- Chains
- 6
- Atoms
- 3,616
- Mol. weight
- 197.39 kDa
- Ligands
- SF4, PQN, CLA
- Released
- 27 May 1998
Explore 2PPS in 3D
Show helices and sheets
RCSB PDB
PDBe
Secondary structure: helices and β-sheets
2PPS contains 47 α-helices and 0 β-strands across 6 chains. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.
Chain A: 18 helices, 0 β-strands
| Element | Residues | Length | Sheet |
|---|
| α-helix | 1-9 | 9 | |
| α-helix | 14-34 | 21 | |
| α-helix | 37-61 | 25 | |
| α-helix | 65-71 | 7 | |
| α-helix | 80-102 | 23 | |
| α-helix | 105-127 | 23 | |
| α-helix | 135-144 | 10 | |
| α-helix | 150-162 | 13 | |
| α-helix | 166-184 | 19 | |
| α-helix | 234-239 | 6 | |
| α-helix | 242-269 | 28 | |
| α-helix | 291-314 | 24 | |
| α-helix | 330-356 | 27 | |
| α-helix | 369-377 | 9 | |
| α-helix | 391-400 | 10 | |
| α-helix | 402-408 | 7 | |
| α-helix | 411-422 | 12 | |
| α-helix | 444-478 | 35 | |
Chain B: 16 helices, 0 β-strands
| Element | Residues | Length | Sheet |
|---|
| α-helix | 1-21 | 21 | |
| α-helix | 27-51 | 25 | |
| α-helix | 63-90 | 28 | |
| α-helix | 108-134 | 27 | |
| α-helix | 141-155 | 15 | |
| α-helix | 161-174 | 14 | |
| α-helix | 175-184 | 10 | |
| α-helix | 185-208 | 24 | |
| α-helix | 225-244 | 20 | |
| α-helix | 265-286 | 22 | |
| α-helix | 307-327 | 21 | |
| α-helix | 354-371 | 18 | |
| α-helix | 392-404 | 13 | |
| α-helix | 408-424 | 17 | |
| α-helix | 435-450 | 16 | |
| α-helix | 471-503 | 33 | |
Chain C: 2 helices, 0 β-strands
| Element | Residues | Length | Sheet |
|---|
| α-helix | 19-23 | 5 | |
| α-helix | 56-59 | 4 | |
Chain F: 5 helices, 0 β-strands
| Element | Residues | Length | Sheet |
|---|
| α-helix | 5-25 | 21 | |
| α-helix | 30-42 | 13 | |
| α-helix | 50-59 | 10 | |
| α-helix | 70-94 | 25 | |
| α-helix | 105-128 | 24 | |
Chain K: 2 helices, 0 β-strands
| Element | Residues | Length | Sheet |
|---|
| α-helix | 2-29 | 28 | |
| α-helix | 43-60 | 18 | |
Chain L: 4 helices, 0 β-strands
| Element | Residues | Length | Sheet |
|---|
| α-helix | 1-11 | 11 | |
| α-helix | 20-46 | 27 | |
| α-helix | 52-79 | 28 | |
| α-helix | 86-110 | 25 | |
Molecules and chains
| Molecule | Chains | Type | Length | Organism | UniProt |
|---|
| Photosystem I | A | protein | 478 | Synechococcus elongatus | |
| Photosystem I | B | protein | 503 | Synechococcus elongatus | |
| Photosystem I | L | protein | 111 | Synechococcus elongatus | |
| Photosystem I | K | protein | 64 | Synechococcus elongatus | |
| Photosystem I | F | protein | 130 | Synechococcus elongatus | |
| Photosystem I | C | protein | 80 | Synechococcus elongatus | |
Sequence of entity 1 (A), FASTA
>2PPS_1 PHOTOSYSTEM I (chains A)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Sequence of entity 2 (B), FASTA
>2PPS_2 PHOTOSYSTEM I (chains B)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXX
Sequence of entity 3 (L), FASTA
>2PPS_3 PHOTOSYSTEM I (chains L)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Sequence of entity 4 (K), FASTA
>2PPS_4 PHOTOSYSTEM I (chains K)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXX
Sequence of entity 5 (F), FASTA
>2PPS_5 PHOTOSYSTEM I (chains F)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXX
Sequence of entity 6 (C), FASTA
>2PPS_6 PHOTOSYSTEM I (chains C)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXX
Ligands and cofactors
| ID | Name | Formula | Copies |
|---|
| SF4 | Iron/sulfur cluster | Fe4 S4 | 3 |
| PQN | Phylloquinone | C31 H46 O2 | 1 |
| CLA | Chlorophyll a | C55 H72 Mg N4 O5 | 89 |
Primary citation
Photosystem I at 4 A resolution represents the first structural model of a joint photosynthetic reaction centre and core antenna system. Krauss, N., Schubert, W.D., Klukas, O. et al. Nat Struct Biol (1996) 3:965-973. DOI 10.1038/nsb1196-965 · PubMed
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