| Project/Area Number |
24000018
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| Research Category |
Grant-in-Aid for Specially Promoted Research
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| Allocation Type | Single-year Grants |
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| Review Section |
Biological Sciences
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| Research Institution | Okayama University |
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Principal Investigator |
SHEN Jian-Ren 岡山大学, 異分野基礎科学研究所, 教授 (60261161)
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| Co-Investigator(Kenkyū-buntansha) |
NOGUCHI Takumi 名古屋大学, 大学院理学研究科, 教授 (60241246)
YAMAGUCHI Kizashi 大阪大学, 産業科学研究所, 特任教授 (80029537)
SHOJI Mitsuo 筑波大学, 計算科学研究センター, 助教 (00593550)
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| Co-Investigator(Renkei-kenkyūsha) |
SUGA Michihiro 岡山大学, 異分野基礎科学研究所, 准教授 (60634920)
AKITA Fusamichi 岡山大学, 異分野基礎科学研究所, 准教授 (50751418)
MINO Hiroyuki 名古屋大学, 大学院理学研究科, 准教授 (70300902)
KATO Yuki 名古屋大学, 大学院理学研究科, 准教授 (10376634)
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| Research Collaborator |
ISOBE Hiroshi 岡山大学, 異分野基礎科学研究所, 准教授 (00379281)
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| Project Period (FY) |
2012 – 2017
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥519,350,000 (Direct Cost: ¥399,500,000、Indirect Cost: ¥119,850,000)
Fiscal Year 2016: ¥62,400,000 (Direct Cost: ¥48,000,000、Indirect Cost: ¥14,400,000)
Fiscal Year 2015: ¥63,050,000 (Direct Cost: ¥48,500,000、Indirect Cost: ¥14,550,000)
Fiscal Year 2014: ¥131,300,000 (Direct Cost: ¥101,000,000、Indirect Cost: ¥30,300,000)
Fiscal Year 2013: ¥115,050,000 (Direct Cost: ¥88,500,000、Indirect Cost: ¥26,550,000)
Fiscal Year 2012: ¥147,550,000 (Direct Cost: ¥113,500,000、Indirect Cost: ¥34,050,000)
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| Keywords | 光合成 / 水分解 / 膜タンパク質 / X線自由電子レーザー / 反応機構 / 結晶構造解析 / 理論計算 / 赤外分光法 / 酸素発生 / QM/MM / プロトン共役電子移動 / 量子力学計算 / フーリエ変換赤外分光法 / プロトン移動 / 水素結合ネットワーク / 光化学系II / フーリエ変換赤外分析法 / 量子計算 / 密度汎関数法 / 電子スピン共鳴 / 蛋白質 / 植物 / 生物物理 |
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| Outline of Final Research Achievements |
In order to elucidate the reaction mechanism of water-splitting performed by photosystem II (PSII) in photosynthesis, we used femtosecond X-ray free electron laser (XFEL) to analyze the radiation damage-free, high-resolution crystal structure of PSII, which revealed the Mn_4CaO_5-cluster structure in its native state. We further used XFEL to analyze the structure of one of the intermediate state, S_3-state, which identified the site of O=O bond formation. Based on these structures, theoretical calculations were performed, which identified possible reaction pathways for the water-splitting. Furthermore, spectroscopic analysis, especially Fourier-transformed infrared spectroscopic analysis, was performed, which elucidated the structural changes of amino acid residues surrounding the Mn_4CaO_5-cluster and identified hydrogen-bond pathways that may participate in the proton exit from the water-splitting reaction site.
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| Assessment Rating |
Verification Result (Rating)
A+
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Assessment Rating |
Result (Rating)
A+: Progress in the research exceeds the initial goal. More than expected research results are expected.
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