A chloroplast membrane conformational change activated by electron transport between the region of photosystem II and plastoquinone
Electron transport from water to lipophilic “Class III” electron acceptors such as dimethyl benzoquinone and high concentrations of dibromothymoquinone potentiate the extra DABS binding to the membranes. These compounds are reduced prior to or at the plastoquinone site.
Electron transfer from water to silicomolybdate plus ferricyanide, a DCMU insensitive reaction, does not result in the incremental diazonium binding.
Photosystem I cyclic electron flow mediated by menadione (anaerobic), which requires participation of plastoquinone does not give the extra diazonium binding.
The exact redox step responsible for the conformational change is not known for certain, but there is a possibility that cytochrome b-559 may be involved. This is suggested by the observation that diazonium treatment of chloroplasts during illumination but not in darkness, causes the conversion of cytochrome b-559 from the high potential form to the low potential form.
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