Biochemistry (Moscow)

, Volume 78, Issue 4, pp 395–402 | Cite as

Vectorial charge transfer reactions on the donor side of manganese-depleted and reconstituted photosystem 2 core complexes

  • I. O. Petrova
  • V. N. Kurashov
  • A. A. Zaspa
  • A. Yu. Semenov
  • M. D. MamedovEmail author


The light-induced functioning of photosystem 2 (PS 2) is directly linked to the translocation of both electrons and protons across the membrane, which results in the formation of transmembrane electric potential difference (ΔΨ). Generation of ΔΨ due to S-state transitions of the water oxidation complex was demonstrated for the first time in Mn-depleted and reconstituted PS 2 core complexes incorporated into liposomes. The kinetics and relative amplitudes of the electrogenic reactions in dark-adapted samples during S1→S2, S2→S3, and S4→S0 transitions in response to the first, second and third laser flashes were comparable to those obtained in the intact PS 2 core particles. These results expand current understanding of the nature and mechanisms of electrogenic (vectorial) reactions due to a charge transfer on the donor side of PS 2.

Key words

photosystem 2 apo-WOC-PS 2 photoactivation S-state transitions proteoliposomes direct electrometric 


PS 2

photosystem 2


primary electron donor

QA and QB

primary and secondary quinone acceptors, respectively


reaction center


water oxidation complex

YZ and Yz·

reduced and neutral radical form of Tyr161 residue of D1 protein, respectively


transmembrane electric potential difference


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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • I. O. Petrova
    • 1
  • V. N. Kurashov
    • 1
  • A. A. Zaspa
    • 1
  • A. Yu. Semenov
    • 1
  • M. D. Mamedov
    • 1
    Email author
  1. 1.Belozersky Institute of Physico-Chemical BiologyLomonosov Moscow State UniversityMoscowRussia

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