O2 reduction by photosystem i involves phylloquinone under steady-state illumination

Marina A. Kozuleva*, Anastasia A. Petrova, Mahir D. Mamedov, Alexey Yu Semenov, Boris N. Ivanov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


O2 reduction was investigated in photosystem I (PS I) complexes isolated from cyanobacteria Synechocystis sp. PCC 6803 wild type (WT) and menB mutant strain, which is unable to synthesize phylloquinone and contains plastoquinone at the quinone-binding site A1. PS I complexes from WT and menB mutant exhibited different dependencies of O2 reduction on light intensity, namely, the values of O2 reduction rate in WT did not reach saturation at high intensities, in contrast to the values in menB mutant. The obtained results suggest the immediate phylloquinone involvement in the light-induced O2 reduction by PS I.

Original languageEnglish
Pages (from-to)4364-4368
Number of pages5
JournalFEBS Letters
Issue number23
StatePublished - 28 Nov 2014
Externally publishedYes


  • Electron transfer
  • Oxygen reduction
  • Photosynthesis
  • Photosystem I
  • Phylloquinone
  • Plastoquinone


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