4L6V image
Entry Detail
PDB ID:
4L6V
Title:
Crystal structure of a virus like photosystem I from the cyanobacterium Synechocystis PCC 6803
Biological Source:
PDB Version:
Deposition Date:
2013-06-13
Release Date:
2014-02-05
Method Details:
Experimental Method:
Resolution:
3.80 Å
R-Value Free:
0.29
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Photosystem I P700 chlorophyll a apoprotein A1
Chain IDs:A, I (auth: a), R (auth: 1)
Chain Length:751
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Polymer Type:polypeptide(L)
Description:Photosystem I P700 chlorophyll a apoprotein A2
Chain IDs:B, J (auth: b), S (auth: 2)
Chain Length:731
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Polymer Type:polypeptide(L)
Description:Photosystem I iron-sulfur center
Chain IDs:C, K (auth: c), T (auth: 3)
Chain Length:81
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Polymer Type:polypeptide(L)
Description:Photosystem I subunit II
Chain IDs:D, L (auth: d), U (auth: 4)
Chain Length:141
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit IV
Chain IDs:E, M (auth: e), V (auth: 5)
Chain Length:74
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Polymer Type:polypeptide(L)
Description:Fusion protein of Photosystem I subunit III and subunit IX
Chain IDs:F, N (auth: f), W (auth: 6)
Chain Length:125
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803, Bacillus subtilis BEST7613
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit VIII
Chain IDs:AA (auth: K), CA (auth: k), DA (auth: 0)
Chain Length:128
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit XI
Chain IDs:G (auth: L), P (auth: l), Y (auth: 8)
Chain Length:157
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit XII
Chain IDs:H (auth: M), Q (auth: m), Z (auth: 7)
Chain Length:31
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Polymer Type:polypeptide(L)
Description:Photosystem I subunit III
Chain IDs:O (auth: i), X (auth: 9), BA (auth: I)
Chain Length:40
Number of Molecules:3
Biological Source:Synechocystis sp. PCC 6803
Primary Citation
Crystal structures of virus-like photosystem I complexes from the mesophilic cyanobacterium Synechocystis PCC 6803.
Elife 3 e01496 e01496 (2014)
PMID: 24473073 DOI: 10.7554/eLife.01496

Abstact

Oxygenic photosynthesis supports virtually all life forms on earth. Light energy is converted by two photosystems-photosystem I (PSI) and photosystem II (PSII). Globally, nearly 50% of photosynthesis takes place in the Ocean, where single cell cyanobacteria and algae reside together with their viruses. An operon encoding PSI was identified in cyanobacterial marine viruses. We generated a PSI that mimics the salient features of the viral complex, named PSI(PsaJF). PSI(PsaJF) is promiscuous for its electron donors and can accept electrons from respiratory cytochromes. We solved the structure of PSI(PsaJF) and a monomeric PSI, with subunit composition similar to the viral PSI, providing for the first time a detailed description of the reaction center and antenna system from mesophilic cyanobacteria, including red chlorophylls and cofactors of the electron transport chain. Our finding extends the understanding of PSI structure, function and evolution and suggests a unique function for the viral PSI. DOI: http://dx.doi.org/10.7554/eLife.01496.001.

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