Comparisons of Electron Transfer Reactions in a Cyanobacterial Tetrameric and Trimeric Photosystem I Complexes

Photosystem I (PSI) is a Type‐I reaction center and is the largest photosynthetic complex to be characterized. In cyanobacteria, PSI is organized as a trimer with a three‐fold axis of symmetry. Recently, a tetrameric form of PSI has been identified in cyanobacteria. Plastids in plants and algae only...

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Bibliographic Details
Published in:Photochemistry and photobiology 2018-05, Vol.94 (3), p.564-569
Main Authors: Shelaev, Ivan V., Mamedov, Mahir D., Gostev, Fedor E., Aybush, Arseny V., Li, Meng, Nguyen, Jonathan, Bruce, Barry D., Nadtochenko, Victor A.
Format: Article
Language:English
Subjects:
Algae
Cyanobacteria
Electron transfer
Electron transfer reactions
Electrons
Kinetics
Photosynthesis
Photosystem I
Phylloquinone
Plastids
Reaction kinetics
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Summary:Photosystem I (PSI) is a Type‐I reaction center and is the largest photosynthetic complex to be characterized. In cyanobacteria, PSI is organized as a trimer with a three‐fold axis of symmetry. Recently, a tetrameric form of PSI has been identified in cyanobacteria. Plastids in plants and algae only contain monomeric PSI, suggesting that tetrameric PSI may be key in the transition from ancestral cyanobacterial trimeric PSI to plant/algal monomeric PSI. We have investigated the kinetics of electron transfer to the initial acceptor in PSI tetramer isolated from Chroococcidiopsis TS‐821. Using a pump–probe technique with 25 fs low‐energy, 720 nm pump pulses, we measure the ultrafast (
ISSN:0031-8655
1751-1097
DOI:10.1111/php.12886