Biochemical evidence for histidine oxidation in photosystem II depleted of the Mn‐cluster for O2‐evolution
- 28 January 1991
- journal article
- Published by Wiley in FEBS Letters
- Vol. 278 (2) , 183-186
- https://doi.org/10.1016/0014-5793(91)80112-g
Abstract
Flash excitation of Tris‐treated photosystem II (PSII) membranes generated a thermoluminescene band peaking ‐25°C. Indicating that a positively charged oxidizing equavalent is stably accumulated on donor side of PSII even in the Mn‐cluster. This oxidizing equivalent was sensitive to low concentrations of exogenous Mn???, and its stable accumulation was reversibly inhibited by diethylpyrocarbonate treatment that modifies histidine residues with high specificity. It was inferred that there is a photooxidizable histidine residue(s) on donor side of PSII and it provides a redox‐active ligand for MnKeywords
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