EPR study of light‐induced regulation of photosynthetic electron transport in Synechocystis sp. strain PCC 6803

FEBS Letters

Semenov, Alexey Yu¹  Mamedov, Mahir D¹  Tikhonov, Alexander N²  Trubitsin, Boris V²  Vitukhnovskaya, Liya A¹ 

[1] A.N. Belozersky Institute of Physico-Chemical Biology, M.V. Lomonosov Moscow State University, Moscow 119899, Russia;Department of Biophysics, Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow 119899, Russia

关键词: Electron transport in Synechocystis sp. PCC 6803;    Photosynthetic control;    Effect of oxygen;   

DOI  :  10.1016/S0014-5793(03)00429-0

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The kinetics of the light-induced redox changes of the photosystem 1 (PS 1) primary donor P₇₀₀ 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.

【 授权许可】

Unknown