A computational study proposes that Photosystem II's S2-to-S3 transition proceeds via the g=4.1 isomer, with W3 hydroxide insertion at Mn4 and a second hydroxide, O7, displacing D1-E189 at Mn1.
Strong hydrogen bonds (shown in dashed lines) are formed between D1-E189, OH7 and µ-O1
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Thermodynamics of the S2-to-S3 State Transition of the Oxygen-Evolving Complex of Photosystem II
A computational study proposes that Photosystem II's S2-to-S3 transition proceeds via the g=4.1 isomer, with W3 hydroxide insertion at Mn4 and a second hydroxide, O7, displacing D1-E189 at Mn1.