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🆕 Date Issued:
1994
🗄 In DepositOnce:2018-11-10
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Binuclear Manganese(III) Complexes as Electron Donors in D1/D2/Cytochrome b559 Preparations Isolated from Spinach Photosystem II Membrane Fragments

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

The capability of different manganese complexes to act as PS II electron donors in D1/D2/ cytochrome b 559 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 D1/D2/cytochrome b559 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.
PS II reaction centermanganesepheophytin photoaccumulationNADP+ reduction
Published in: Zeitschrift für Naturforschung C, 10.1515/znc-1994-9-1008, De Gruyter
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