Abstract
The nature of the ligands to manganese in the photosynthetic oxygen-evolving system was investigated by the effect of isotopic substitution with 15N on the spectral properties of the multiline EPR signal of the S2 state. No changes were observed in the general shape of the signal or in the linewidth. The results show that the resolved fine structure in the multiline signal cannot be explained as nitrogen superhyperfine structure but most likely arises from manganese hyperfine interaction. The large difference between the highest value for the nitrogen coupling constant consistent with the results and that earlier observed in a binuclear, antiferromagnetically coupled manganese model complex strongly favors non-nitrogen ligands such as oxygen in carboxylic amino acid side chains.
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