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Reconstitution of the water-oxidizing complex in manganese-depleted photosystem II preparations using synthetic binuclear Mn(II) and Mn(IV) complexes: production of hydrogen peroxide |
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| Authors: | Toshi Nagata Takayuki Nagasawa Sergei K Zharmukhamedov Vyacheslav V Klimov Suleyman I Allakhverdiev |
| Institution: | (1) Research Center for Molecular-scale Nanoscience, Institute for Molecular Science (IMS), National Institutes for Natural Sciences (NINS), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan;(2) Department of Structural Molecular Science, Graduate University for Advanced Studies (Sokendai), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan;(3) Institute of Basic Biological Problems, RAS, Pushchino, Moscow Region, 142290, Russia |
| Abstract: | Reconstitution of Mn-depleted PSII particles with synthetic binuclear Mn complexes (one Mn(II)2 complex and one Mn(IV)2 complex) was examined. In both cases the electron-transfer rates in the reconstituted systems were found to be up to 75–82% of that measured in native PSII but the oxygen evolution activity remained lower (<5–40%). However, hydrogen peroxide was also produced by the reconstituted samples. These samples therefore represent a new type of reconstituted PSII that generates hydrogen peroxide as the final product in reconstituted PSII centers. |
| Keywords: | Hydrogen peroxide Manganese complex Photosystem II Reconstitution Water-oxidizing complex |
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