Binuclear Manganese(III) Complexes as Electron Donors in D1/D 2/Cytochrome b 559 Preparations Isolated from Spinach Photosystem II Membrane Fragments

S. I. Allakhverdiev, V. V. Klimov, M. S. Karacan, G. Somer, N. Karacan, E. M. Khan, S. Y. Rane, S. Padhye, G. Renger

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The capability of different manganese complexes to act as PS II electron donors in D 1/D2/ cytochrome b559 complexes has been analyzed by measuring actinic light-induced absorption changes at 680 nm (650 nm) and 340 nm, reflecting the photoaccumulation of Pheophytin - (Pheo-) and the reduction of NADP+, respectively. The data obtained reveal: a) the donor capacity of synthetic binuclear Mn(III)2 complexes containing aromatic ligands significantly exceeds that for MnCl2 in both cases, i.e. Pheo photoaccumulation and NADP+ reduction; b) manganese complexes can serve as suitable electron donors for light-induced NADP+ reduction catalyzed by D 1/D 2/cytochrome b 559 complexes and ferredoxin plus ferredoxin-NADP+ reductase under anaerobic conditions and c) the specific turnover rate of the system leading to NADP+ reduction is extremely, small. The implications of these findings are briefly, discussed.

Original languageEnglish
Pages (from-to)587-592
Number of pages6
JournalZeitschrift fur Naturforschung - Section C Journal of Biosciences
Issue number9-10
Publication statusPublished - Oct 1994



  • Manganese
  • NADP+ Reduction
  • PS II Reaction Center
  • Pheophytin Photoaccumulation

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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