PARENT SESSION
Posters P7A Mechanisms of water oxidation. Abstracts (347-381)

Reconstitution of the water-oxidizing complex in manganese-depleted Photosystem II complexes by using synthetic manganese complexes. Shuqin Li^*,1, Guangye Han², Guiying Chen³, Qiutian Liu⁴, Liangbi Li⁵, Tingyun Kuang⁶, ¹ 20 Nanxincun, Xiangshan, Haidian District, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, China, China² 20 Nanxincun, Xiangshan, Haidian District, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, China, China³ 20 Nanxincun, Xiangshan, Haidian District, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, China, China⁴ State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Scienc, China⁵ 20 Nanxincun, Xiangshan, Haidian District, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, China, China⁶ 20 Nanxincun, Xiangshan, Haidian District, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, China, China

ABSTRACT- The efficiency of synthetic manganese complexes in reconstituting PSII oxygen-evolution capacity and electron flow was analyzed in PSII membrane fragments depleted of their manganese and of three extrinsic proteins. Data obtained reveal that the capacity of synthetic manganese complexes in restoring electron transfer and oxygen-evolution is mainly related to the valance of manganese and size of ligand. Mononuclear manganese complexes, which have +2 valance of manganese and small ligands such as Cl and H2O, show higher efficiency in electron transfer and oxygen evolution than MnCl2 while manganese complexes with +3 valance or large ligands show no capability or low efficiency in restoration of O2-evolution even through some of them are active in reactivation of variable fluorescence.

KEY WORDS: Water-Oxidizing Complex, Reconstitution, Synthetic Manganese Complexes