TY - JOUR
T1 - Binuclear Manganese(III) Complexes as Electron Donors in D1/D 2/Cytochrome b 559 Preparations Isolated from Spinach Photosystem II Membrane Fragments
AU - Allakhverdiev, S. I.
AU - Klimov, V. V.
AU - Karacan, M. S.
AU - Somer, G.
AU - Karacan, N.
AU - Khan, E. M.
AU - Rane, S. Y.
AU - Padhye, S.
AU - Renger, G.
PY - 1994/10
Y1 - 1994/10
N2 - 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.
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.
KW - Manganese
KW - NADP+ Reduction
KW - PS II Reaction Center
KW - Pheophytin Photoaccumulation
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U2 - 10.1515/znc-1994-9-1008
DO - 10.1515/znc-1994-9-1008
M3 - Article
AN - SCOPUS:0028002855
VL - 49
SP - 587
EP - 592
JO - Zeitschrift fur Naturforschung. Section C: Biosciences
JF - Zeitschrift fur Naturforschung. Section C: Biosciences
SN - 0939-5075
IS - 9-10
ER -