2009 Fiscal Year Final Research Report
Study of concerted electron, excitation and proton transfer mediated by a midway molecule in biological systems
| Project/Area Number |
18540402
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biophysics/Chemical physics
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| Research Institution | University of Tsukuba |
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Principal Investigator |
SUMI Hitoshi University of Tsukuba, 名誉教授 (10134206)
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| Project Period (FY) |
2006 – 2009
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| Keywords | 光合成 / 反応中心 / 電子移動 / 励起移動 / 中間分子媒介 |
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| Research Abstract |
We constructed a theory on a general expression of the rate constant of concerted processes mediated by a midway molecule, and explained experimental data in an artificial system realizing various phases of the concerted processes. Based on this general expression, we explained experimental data in following three processes important in primary processes of photosynthesis in green plants and algae by showing them to be concerted ones in mediation of a midway molecule and calculating their rate constants. They are the process of excitation-energy fixing from the antenna system by charge-separated-state formation in the reaction center of photosystem II, that of formation of a spin triplet state by occasional charge recombination from the charge-separated state, and that of removing the triplet state which is hazardous by generating active oxygen molecules.
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