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EPR study of light‐induced regulation of photosynthetic electron transport in Synechocystis sp. strain PCC 6803
Author(s) -
Trubitsin Boris V,
Mamedov Mahir D,
Vitukhnovskaya Liya A,
Semenov Alexey Yu,
Tikhonov Alexander N
Publication year - 2003
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 - 10.1016/s0014-5793(03)00429-0
Subject(s) - electron transport chain , photosystem , electron transfer , photosystem i , p700 , synechocystis , electron paramagnetic resonance , photosynthesis , photochemistry , chemistry , cyanobacteria , electrochemical gradient , cytochrome b6f complex , redox , dcmu , biophysics , electron donor , photosynthetic reaction centre , kinetics , photosystem ii , biochemistry , biology , nuclear magnetic resonance , physics , membrane , bacteria , inorganic chemistry , catalysis , quantum mechanics , genetics
The kinetics of the light‐induced redox changes of the photosystem 1 (PS 1) primary donor P 700 in whole cells of the cyanobacteria Synechocystis sp. PCC 6803 were studied by the electron paramagnetic resonance method. It was shown that the linear photosynthetic electron transport in cyanobacteria was controlled by two main mechanisms: (i) oxygen‐dependent acceleration of electron transfer from PS 1 to NADP + due to activation of the Calvin cycle reactions and (ii) retardation of electron flow between two photosystems governed by a transmembrane proton gradient. In addition to the linear photosynthetic electron transport, cyanobacteria were capable of maintaining alternative pathways involving cyclic electron transfer around PS 1 and respiratory chains.