Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 124, Issue 27, Pages 5531-5537Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.0c02913
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Funding
- Nanotechnology Platform Program (Molecule and Material Synthesis) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- JSPS KAKENHI [JP20H05096, JP17H06435, JP17H03662, JP17H06433]
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The g-factor shift of the g = 4.1 EPR signal was detected in spinach PsbO/P/Q-depleted PS II. The effective g-factor of the signal shifts up to similar to 4.9, depending on the Ca2+ concentration. Hyperfine structure spacing with about 3 mT was detected in this g = 5 (4.9) signal. The shift to g = 5 (4.9) was related to the distortion of the manganese cluster, derived from the modification of the chemical bond or the crystalline field of the Mn4(III) in the manganese cluster. Based on the EPR analysis of the g = 5 (4.9) spin state, another molecular structure of the S-2 state, a distant Mn structure, was discussed as an intermediate state between the S-2 and S-3 states.
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