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• W2783809993 abstract "Abstract 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 (<100 fs) conversion of a delocalized exciton into a charge‐separated state between the primary donor P 700 and the primary acceptor A 0 . Comparison with previous pump–probe analysis of the trimeric PSI complexes from Synechocystis sp PCC 6803 (Shelaev et al . [2010] Biochim Biophys Acta, 1797, 1410–1420) reveals that the tetrameric ( PSI ) complexes from Chroococcidiopsis sp TS ‐821 are quite similar. The transfer of an electron from the A 0 to the following acceptor A1 (phylloquinone) takes place in a time frame of about 30 ps, which is slightly longer compared to PSI trimeric complex (~24 ps). The slight spectral differences between trimeric and tetrameric PSI complexes are discussed." @default.
• W2783809993 created "2018-01-26" @default.
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• W2783809993 date "2018-03-02" @default.
• W2783809993 modified "2023-09-26" @default.
• W2783809993 title "Comparisons of Electron Transfer Reactions in a Cyanobacterial Tetrameric and Trimeric Photosystem I Complexes" @default.
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• W2783809993 doi "https://doi.org/10.1111/php.12886" @default.
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• W2783809993 hasPublicationYear "2018" @default.
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