Cyclic electron transfer around Photosystem I mediated by 2,3-dichloro-1,4-naphtoquinone and ascorbate.

Autor: Petrova AA; A.N. Belozersky Institute of Physical-Chemical Biology, M.V. Lomonosov Moscow State University, Russia., Trubitsin BV; Faculty of Physics, M.V. Lomonosov Moscow State University, Russia., Boskhomdzhieva BK; A.N. Belozersky Institute of Physical-Chemical Biology, M.V. Lomonosov Moscow State University, Russia., Semenov AY; A.N. Belozersky Institute of Physical-Chemical Biology, M.V. Lomonosov Moscow State University, Russia.; N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia., Tikhonov AN; Faculty of Physics, M.V. Lomonosov Moscow State University, Russia.; N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia.
Jazyk: angličtina
Zdroj: FEBS letters [FEBS Lett] 2018 Jul; Vol. 592 (13), pp. 2220-2226. Date of Electronic Publication: 2018 Jun 21.
DOI: 10.1002/1873-3468.13154
Abstrakt: In this work, we investigated electron transport around the photosynthetic pigment-protein complex of Photosystem I (PS I) mediated by external high-potential electron carrier 2,3-dichloro-1,4-naphtoquinone (Cl 2 NQ) and ascorbate. It has been demonstrated that the oxidized species of Cl 2 NQ and ascorbate serve as intermediates capable of accepting electrons from the iron-sulfur cluster F X of PS I. Reduced species of Cl 2 NQ and ascorbate are oxidized by photooxidized PS I primary donor P700+ and/or by molecular oxygen. We have found the synergistic effect of Cl 2 NQ and ascorbate on the rate of P700+ reduction. Accelerated electron flow to P700+, observed in the presence of both Cl 2 NQ and ascorbate, is explained by an increase in the reduced species of Cl 2 NQ due to electron transfer from ascorbate.
(© 2018 Federation of European Biochemical Societies.)
Databáze: MEDLINE
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