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

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

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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
Volume49
Issue number9-10
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

Fingerprint

Photosystem II Protein Complex
Spinacia oleracea
Manganese
NADP
Electrons
Membranes
Pheophytins
Ferredoxin-NADP Reductase
Light
Ferredoxins
Ligands
cytochrome b559

Keywords

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

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Binuclear Manganese(III) Complexes as Electron Donors in D1/D 2/Cytochrome b 559 Preparations Isolated from Spinach Photosystem II Membrane Fragments. / Allakhverdiev, Suleyman; Klimov, V. V.; Karacan, M. S.; Somer, G.; Karacan, N.; Khan, E. M.; Rane, S. Y.; Padhye, S.; Renger, G.

In: Zeitschrift fur Naturforschung - Section C Journal of Biosciences, Vol. 49, No. 9-10, 01.01.1994, p. 587-592.

Research output: Contribution to journalArticle

Allakhverdiev, Suleyman ; Klimov, V. V. ; Karacan, M. S. ; Somer, G. ; Karacan, N. ; Khan, E. M. ; Rane, S. Y. ; Padhye, S. ; Renger, G. / Binuclear Manganese(III) Complexes as Electron Donors in D1/D 2/Cytochrome b 559 Preparations Isolated from Spinach Photosystem II Membrane Fragments. In: Zeitschrift fur Naturforschung - Section C Journal of Biosciences. 1994 ; Vol. 49, No. 9-10. pp. 587-592.
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AU - Karacan, M. S.

AU - Somer, G.

AU - Karacan, N.

AU - Khan, E. M.

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AB - 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.

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