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Photosynthetic electron transport in the cyanobacteriumSynechocystis sp. PCC 6803: High-Field W-band and X-band EPR study of electron flow through photosystem I

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Abstract

In this work, by using the respective advantages of W- and X-band electron paramagnetic resonance (EPR) spectroscopy techniques to investigate electron transport processes, we have studied the light-induced redox transients of the primary electron donor P700 and the secondary acceptor A1 in photosystem (PS) I complexes of intact cyanobacterial cellsSynechocystis sp. PCC 6803. We found that the kinetic behavior of the cation radical P700 ·+ generated by illumination with continuous light, and the EPR intensity of the radical pair P700 ·+A ·−1 generated upon laser pulse illumination strongly depend on the illumination prehistory (either the sample was frozen in the dark or during illumination). Both these processes were sensitive to the presence of electron transport inhibitors which block electron flow between the two photosystems. In line with our X-band EPR data on the kinetics of light-induced redox transients of P700, our high-field W-band EPR study of the radical-pair state P700 ·+A ·−1 shows that photosynthetic electron flow through the PS I reaction center is controlled both on the donor and on the acceptor side of PS I.

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Authors and Affiliations

  1. Department of Physics, Free University Berlin, Berlin, Germany

    A. Savitsky & K. Möbius

  2. Department of Biophysics, Faculty of Physics, Moscow State University, 119992, Moscow, Russian Federation

    B. V. Trubitsin & A. N. Tikhonov

  3. A. N. Belozersky Institute of Physical-Chemical Biology, Moscow State University, Moscow, Russian Federation

    A. Yu. Semenov

Authors
  1. A. Savitsky
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  2. B. V. Trubitsin
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  3. K. Möbius
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  4. A. Yu. Semenov
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  5. A. N. Tikhonov
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Savitsky, A., Trubitsin, B.V., Möbius, K. et al. Photosynthetic electron transport in the cyanobacteriumSynechocystis sp. PCC 6803: High-Field W-band and X-band EPR study of electron flow through photosystem I. Appl. Magn. Reson. 31, 221–236 (2007). https://doi.org/10.1007/BF03166258

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  • DOI: https://doi.org/10.1007/BF03166258

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