Molecular Structure of the S2 State with a g = 5 Signal in the Oxygen Evolving Complex of Photosystem II

The Journal of Physical Chemistry. B
Shota TaguchiHiroyuki Mino

Abstract

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 ∼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 S2 state, a "distant Mn" structure, was discussed as an intermediate state between the S2 and S3 states.

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Dec 5, 2019·The Journal of Physical Chemistry. B·Hiroyuki Mino, Hiroki Nagashima

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Citations

Oct 9, 2020·Angewandte Chemie·Georgia ZahariouDimitrios A Pantazis
Jun 29, 2021·The Journal of Physical Chemistry. B·Thomas A CorryPatrick J O'Malley
Sep 3, 2020·The Journal of Physical Chemistry. a·Xi-Chen LiPer E M Siegbahn
Sep 30, 2020·The Journal of Physical Chemistry Letters·Shota TaguchiHiroyuki Mino

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