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Journal of Bioenergetics and Biomembranes

, Volume 47, Issue 4, pp 361–367 | Cite as

The extrinsic PsbO protein modulates the oxidation/reduction rate of the exogenous Mn cation at the high-affinity Mn-binding site of Mn-depleted PSII membranes

  • Boris K. SeminEmail author
  • Tatiana E. Podkovirina
  • Lira N. Davletshina
  • Kirill N. Timofeev
  • Il’ya I. Ivanov
  • Andrei B. Rubin
Article

Abstract

The oxidation of exogenous Mn(II) cations at the high-affinity (HA) Mn-binding site in Mn-depleted photosystem II (PSII) membranes with or without the presence of the extrinsic PsbO polypeptide was studied by EPR. The six-lines EPR spectrum of Mn(II) cation disappears in the absence of the PsbO protein in membranes under illumination, but there was no effect when PSII preparations bound the PsbO protein. Our study demonstrates that such effect is determined by significant influence of the PsbO protein on the ratio between the rates of Mn oxidation and reduction at the HA site when the membranes are illuminated.

Keywords

Photosystem II PsbO extrinsic protein High-affinity Mn-binding site Mn(II) Oxygen-evolving complex 

Notes

Acknowledgments

We are grateful to Prof. Yurina N.P. and Mokerova D.V. (Russian Academy of Sciences A.N. Bach Institute of Biochemistry) for performing SDS-urea-PAGE. We sincerely thank Dr. Trubitsin B.V. for help with some EPR measurements (Physical Faculty, Moscow State University) and Dr. M. Seibert (National Renewable Energy Laboratory, USA) for technical comments and correcting the English.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Boris K. Semin
    • 1
    Email author
  • Tatiana E. Podkovirina
    • 1
  • Lira N. Davletshina
    • 1
  • Kirill N. Timofeev
    • 1
  • Il’ya I. Ivanov
    • 1
  • Andrei B. Rubin
    • 1
  1. 1.Department of Biophysics, Faculty of BiologyLomonosov Moscow State UniversityMoscowRussia

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