Biochemistry (Moscow)

, Volume 84, Issue 9, pp 1057–1064 | Cite as

Electron Transfer on the Donor Side of Manganese-Depleted Photosystem 2

  • L. A. Vitukhnovskaya
  • E. V. Fedorenko
  • M. D. MamedovEmail author


After removal of manganese ions responsible for light-driven water oxidation, redox-active tyrosine YZ (tyrosine 161 of the D1 subunit) still remains the dominant electron donor to the photooxidized chlorophyll P680 (\({\rm{P}}_{680}^+\)) in the reaction center of photosystem 2 (PS2). Here, we investigated \({\rm{P}}_{680}^+\) reduction by YZ under single-turnover flashes in Mn-depleted PS2 core complexes in the presence of weak acids and NH4Cl. Analysis of changes in the light-induced absorption at 830 nm (reflecting P680 redox transitions) at pH 6.0 showed that \({\rm{P}}_{680}^+\) reduction is well approximated by two kinetic components with the characteristic times (τ) of ~7 and ~31 μs and relative contributions of ~54 and ~37%, respectively. In con-trast to the very small effect of sodium formate (200 mM), addition of sodium acetate and NH4Cl increased the rate of electron transfer between YZ and \({\rm{P}}_{680}^+\) approx. by a factor of 5. The suggestion that direct electron transfer from YZ to \({\rm{P}}_{680}^+\) has a biphasic kinetics and reflects the presence of two different populations of PS2 centers was confirmed by the data obtained using direct electrometrical technique. It was demonstrated that the submillisecond two-phase kinetics of the additional electrogenic phase in the kinetics of photoelectric response due to the electron transfer between YZ and \({\rm{P}}_{680}^+\) is significantly accelerated in the presence of acetate or ammonia. These results contribute to the understanding of the mechanism of inter-action between the oxidized tyrosine YZ and exogenous substances (including synthetic manganese-containing compounds) capable of photooxidation of water molecule in the manganese-depleted PS2 complexes.


photosystem 2 reaction center apo-PS2 absorption changes photoelectric response acetate ammonia 



transmembrane electric potential


characteristic time


Mn-depleted PS2 complexes




photosystem 2


primary quinone acceptor


reaction center


water-oxidizing complex


tyrosine 161 of the D1 subunit


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The authors are grateful to A. Yu. Semenov for critical discussion.

Funding. This work was supported by the Russian Science Foundation (project 17-14-01323) and the Russian Foundation for Basic Research (project AAAA-A19-119012990175-9) within the framework of the State Assignment “Chemical and Physical Mechanisms of Interaction of Intense Laser Radiation with Biological Systems”.

Ethical approval. This article does not contain any studies with human participants or animals performed by any of the authors.


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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • L. A. Vitukhnovskaya
    • 1
    • 2
  • E. V. Fedorenko
    • 3
  • M. D. Mamedov
    • 1
    Email author
  1. 1.Belozersky Institute of Physico-Chemical BiologyLomonosov Moscow State UniversityMoscowRussia
  2. 2.Semenov Institute of Chemical PhysicsRussian Academy of SciencesMoscowRussia
  3. 3.Moscow Institute of Physics and TechnologyDolgoprudny, Moscow RegionRussia

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