6NWA image
Entry Detail
PDB ID:
6NWA
EMDB ID:
EMD-0524
Keywords:
PHOTOSYNTHESIS
Title:
The structure of the photosystem I IsiA super-complex
Biological Source:
Source Organism:
Synechocystis sp. PCC 6803
PDB Version:
Deposition Date:
2019-02-06
Release Date:
2019-05-29
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.48 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
6NWA validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I P700 chlorophyll a apoprotein A1
Chain IDs:A, Q (auth: a), DA (auth: H)
Chain Length:751
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P29254 Pfam ID:PF00223
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I P700 chlorophyll a apoprotein A2
Chain IDs:B, R (auth: b), EA (auth: G)
Chain Length:731
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P29255 Pfam ID:PF00223
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I iron-sulfur center
Chain IDs:C, VA (auth: c), WA (auth: N)
Chain Length:81
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P32422 Pfam ID:PF12838
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit II
Chain IDs:D, S (auth: d), FA (auth: O)
Chain Length:141
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P19569 Pfam ID:PF02531
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit IV
Chain IDs:E, PA (auth: e), QA (auth: P)
Chain Length:74
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P12975 Pfam ID:PF02427
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit III
Chain IDs:F, RA (auth: f), SA (auth: Q)
Chain Length:165
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P29256 Pfam ID:PF02507
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit VIII
Chain IDs:G (auth: I), T (auth: i), GA (auth: R)
Chain Length:40
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:Q55330 Pfam ID:PF00796
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit IX
Chain IDs:H (auth: J), TA (auth: j), UA (auth: S)
Chain Length:40
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:Q55329 Pfam ID:PF01701
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit XI
Chain IDs:I (auth: L), V (auth: l), HA (auth: U)
Chain Length:157
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P37277 Pfam ID:PF02605
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit XII
Chain IDs:J (auth: M), W (auth: m), IA (auth: V)
Chain Length:31
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P72986 Pfam ID:PF07465
Protein Blast
Polymer Type:polypeptide(L)
Description:Iron stress-induced chlorophyll-binding protein
Chain IDs:K (auth: W), L (auth: X), M (auth: Y), N (auth: Z), O (auth: g), P (auth: y), X (auth: n), Y (auth: o), Z (auth: p), AA (auth: q), BA (auth: r), CA (auth: h), JA (auth: t), KA (auth: u), LA (auth: s), MA (auth: w), NA (auth: x), OA (auth: v)
Chain Length:342
Number of Molecules:18
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:Q55274 Pfam ID:PF00421
Protein Blast
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit PsaK 1
Chain IDs:U (auth: k), XA (auth: K), YA (auth: T)
Chain Length:86
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
UniProt ID:P72712 Pfam ID:PF01241
Ligand Molecules
BCR
CA
CL0
CLA
LHG
LMG
LMT
PQN
SF4
Primary Citation
The structure of the stress-induced photosystem I-IsiA antenna supercomplex.
Nat.Struct.Mol.Biol. 26 443 449 (2019)
PMID: 31133699 DOI: 10.1038/s41594-019-0228-8

Abstact

Photochemical conversion in oxygenic photosynthesis takes place in two large protein-pigment complexes named photosystem II and photosystem I (PSII and PSI, respectively). Photosystems associate with antennae in vivo to increase the size of photosynthetic units to hundreds or thousands of pigments. Regulation of the interactions between antennae and photosystems allows photosynthetic organisms to adapt to their environment. In low-iron environments, cyanobacteria express IsiA, a PSI antenna, critical to their survival. Here we describe the structure of the PSI-IsiA complex isolated from the mesophilic cyanobacterium Synechocystis sp. PCC 6803. This 2-MDa photosystem-antenna supercomplex structure reveals more than 700 pigments coordinated by 51 subunits, as well as the mechanisms facilitating the self-assembly and association of IsiA with multiple PSI assemblies.

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Primary Citation of related structures
6NWA