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

Boris V. Trubitsin, Mahir D. Mamedov, Liya A. Vitukhnovskaya, Alexey Yu Semenov, Alexander N. Tikhonov

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)15-20
Number of pages6
JournalFEBS Letters
Volume544
Issue number1-3
DOIs
Publication statusPublished - Jun 5 2003
Externally publishedYes

Keywords

  • Effect of oxygen
  • Electron transport in Synechocystis sp. PCC 6803
  • Photosynthetic control

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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