Mechanism of adiabatic primary electron transfer in photosystem I: Femtosecond spectroscopy upon excitation of reaction center in the far-red edge of the QY band

The ultrafast primary charge separation in Photosystem I (PS I) excited by femtosecond pulses centered at 720 and 760nm was studied by pump-to-probe laser spectroscopy. The absorbance in the red edge of PS I absorption spectrum has an unusual exponential dependence on wavelength. The cutoff of short...

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Bibliographic Details
Published in:Biochimica et biophysica acta. Bioenergetics 2017-11, Vol.1858 (11), p.895-905
Main Authors: Cherepanov, Dmitry A., Shelaev, Ivan V., Gostev, Fedor E., Mamedov, Mahir D., Petrova, Anastasia A., Aybush, Arseniy V., Shuvalov, Vladimir A., Semenov, Alexey Yu, Nadtochenko, Victor A.
Format: Article
Language:English
Subjects:
Adiabatic electron transfer
Far-red light
Femtosecond laser spectroscopy
Photosynthesis, photosystem I, charge separation
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Summary:The ultrafast primary charge separation in Photosystem I (PS I) excited by femtosecond pulses centered at 720 and 760nm was studied by pump-to-probe laser spectroscopy. The absorbance in the red edge of PS I absorption spectrum has an unusual exponential dependence on wavelength. The cutoff of short wavelength components of 760nm pulse allows direct excitation of reaction center chlorophyll molecules without involvement of light-harvesting antenna. The transient spectrum manifests the features of the primary ion-radical pair P700+A0− at time delay
ISSN:0005-2728
1879-2650
DOI:10.1016/j.bbabio.2017.08.008