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1Author    G. Ábor Bernát3, Subhash Padhyeb, Csilla Barta3, L. Ászló Kovács3, Sándor Demeter3Requires cookie*
 Title    Chemical Probes for Water-Oxidation: Synthetic Manganese Complexes in Photoactivation of Water Splitting Complex and as Exogenous Electron Donors to Photosystem II  
 Abstract    , Hungary. Fax: + 3 6 -6 2 -4 3 3 -4 3 4 . E-m ail: tudor@nucleus.szbk.u-szeged.hu b D epartm ent Photoactivation of the water splitting enzyme was perform ed with 13 different synthetic manganese complexes and characterized by oxygen evolution yield, thermoluminescence and chlorophyll fluorescence induction kinetics. The efficiency of different compounds in photo­ activation correlated with the rate of linear electron transport in the presence of these com ­ pounds. The organic ligands, associated with the manganese ions, do not prevent the photoac­ tivation of the water splitting complex (W O C). Photoactivation with different manganese complexes depended on the number of the Mn-ions in the complex, their valence state and the nature of their donor atoms. The most efficient restorations were achieved by using tetram eric complexes having a dimer+dimer structure, complexes containing M n(II) ions, and having 4 -6 oxygen and 0 -2 nitrogen atoms as donor atoms. Further, the effectiveness of photoactivation depended largely on the structure of the complexes. Our data support the notion that W O C in intact thylakoids requires the cooperation and well determined arrange­ ment of all four manganese ions, and argue against the hypothesis that two manganese ions are sufficient for water splitting. Photoactivation by some complexes led to anomalous flash-oxygen patterns, which are explained by a modified/perturbed water splitting complex. 
  Reference    Z. Naturforsch. 56c, 755 (2001); received April 9/M ay 28 2001 
  Published    2001 
  Keywords    Photosystem II, W ater Splitting Complex, Synthetic M anganese Complexes Abbreviations: Chi, chlorophyll; DCMU, 3-(3', 4'-dichloro- 
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 TEI-XML for    default:Reihe_C/56/ZNC-2001-56c-0755.pdf 
 Identifier    ZNC-2001-56c-0755 
 Volume    56