Abstract
EPR signals of Cyt b-559 heme Fe(III) ligated by OH − and the multiline signal of the Mn cluster in PS-II membrane fragments have been investigated. In 2,3-dicyano-5,6-dichloro- p-benzoquinone-oxidized PS-II membrane fragments the light-induced decrease of the EPR signal of the heme Fe(III)-OH − is accompanied by the appearance of the EPR multiline signal of the Mn cluster. Addition of F − ions, which act as a stronger ligand for heme Fe(III) than OH −, decreases to the same extent the dark- and light-induced signal of the heme Fe(III)-OH − and the light-induced multiline signal of the Mn cluster. These results are discussed in terms of the light-induced formation of a bound OH′ radical shared between the Cyt b-559 heme Fe and the Mn cluster as a first step of water oxidation.
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