Electrogenicity accompanies photoreduction of the iron-sulfur clusters F(A) and F(B) in photosystem I

Mahir D. Mamedov, Kira N. Gourovskaya, Ilya R. Vassiliev, John H. Golbeck, Alexey Yu Sememov

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14 Scopus citations

Abstract

Photovoltage responses accompanying electron transfer on the acceptor side of photosystem I (PS I) were investigated in proteoliposomes containing PS I complexes from the cyanobacterium Synechococcus sp. PCC 6301 using a direct electrochemical technique. The relative contributions of the F(X) → F(B) and the F(X) → F(A) electron transfer reactions to the overall electrogenicity were elucidated by comparing the sodium dithionite-induced decrease in the magnitude of the total photoelectric responses in control and in F(B)-less (HgCl2-treated) PS I complexes. The results obtained suggest that the electrogenesis on the acceptor side of PS I is related to electron transfers between both F(X) and F(A) and F(A) and F(B). Based on the electrogenic nature of the latter reaction in PS I complexes, we conclude that F(A) rather than F(B) is the acceptor proximal to F(X).

Original languageEnglish (US)
Pages (from-to)219-223
Number of pages5
JournalFEBS Letters
Volume431
Issue number2
DOIs
StatePublished - Jul 17 1998

All Science Journal Classification (ASJC) codes

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

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