4KT0: Crystal Structure Of A Virus Like Photosystem I From The Cyanobacterium Synechocystis Pcc 6803

Citation:
Abstract
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.
PDB ID: 4KT0Download
MMDB ID: 117251
PDB Deposition Date: 2013/5/19
Updated in MMDB: 2014/10
Experimental Method:
x-ray diffraction
Resolution: 2.8  Å
Source Organism:
Similar Structures:
Biological Unit for 4KT0: nonameric; determined by author
Molecular Components in 4KT0
Label Count Molecule
Proteins (9 molecules)
1
Photosystem I P700 Chlorophyll a Apoprotein A1
Molecule annotation
1
Photosystem I P700 Chlorophyll a Apoprotein A2
Molecule annotation
1
Photosystem I Iron-sulfur Center
Molecule annotation
1
Photosystem I Subunit II
Molecule annotation
1
Photosystem I Reaction Center Subunit IV
Molecule annotation
1
Photosystem I Subunit III
Molecule annotation
1
Photosystem I Reaction Center Subunit IX
Molecule annotation
1
Photosystem I Reaction Center Subunit Psak
Molecule annotation
1
Photosystem I Reaction Center Subunit XII
Molecule annotation
Chemicals (122 molecules)
1
2
2
3
3
4
4
2
5
17
6
90
7
2
8
1
9
1
* Click molecule labels to explore molecular sequence information.

Citing MMDB
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