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Cyclic electron transfer around Photosystem I mediated by 2,3‐dichloro‐1,4‐naphtoquinone and ascorbate
Author(s) -
Petrova Anastasia A.,
Trubitsin Boris V.,
Boskhomdzhieva Baina K.,
Semenov Alexey Yu.,
Tikhonov Alexander N.
Publication year - 2018
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1002/1873-3468.13154
Subject(s) - electron transfer , photosystem ii , photosystem i , chemistry , p700 , cytochrome b6f complex , electron transport chain , photochemistry , biophysics , photosynthesis , biochemistry , biology
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 P 700 + and/or by molecular oxygen. We have found the synergistic effect of Cl 2 NQ and ascorbate on the rate of P 700 + reduction. Accelerated electron flow to P 700 + , 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.