| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2019: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2017: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
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| Outline of Final Research Achievements |
Photosystem II (PSII) progresses the first reaction of photosynthesis, in which the oxygen-evolving complex (Mn4Ca cluster) splits two water molecules and produces one molecular oxygen. By crystal structure analyses of PSII utilizing anomalous dispersion effect of Mn atoms, valence distributions of the four Mn atoms denoted from Mn1 to Mn4 in the Mn4Ca clusters were established. The results showed that Mn1 altered it valence number as III and II for two PSII monomers in a crystallographic asymmetric unit. Based on the new knowledge obtained for the S1 and S0 states of the Kok cycle model, changes in redox potential were presumed for the hole oxygen-evolving reaction, and a reaction mechanism of PSII was newly proposed.
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